Impressum vc4_hdmi.c   Interaktion und
PortierbarkeitC

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2015 Broadcom
 * Copyright (c) 2014 The Linux Foundation. All rights reserved.
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 */

/**
 * DOC: VC4 Falcon HDMI module
 *
 * The HDMI core has a state machine and a PHY.  On BCM2835, most of
 * the unit operates off of the HSM clock from CPRMAN.  It also
 * internally uses the PLLH_PIX clock for the PHY.
 *
 * HDMI infoframes are kept within a small packet ram, where each
 * packet can be individually enabled for including in a frame.
 *
 * HDMI audio is implemented entirely within the HDMI IP block.  A
 * register in the HDMI encoder takes SPDIF frames from the DMA engine
 * and transfers them over an internal MAI (multi-channel audio
 * interconnect) bus to the encoder side for insertion into the video
 * blank regions.
 *
 * The driver's HDMI encoder does not yet support power management.
 * The HDMI encoder's power domain and the HSM/pixel clocks are kept
 * continuously running, and only the HDMI logic and packet ram are
 * powered off/on at disable/enable time.
 *
 * The driver does not yet support CEC control, though the HDMI
 * encoder block has CEC support.
 */

#include <drm/display/drm_hdmi_audio_helper.h>
#include <drm/display/drm_hdmi_helper.h>
#include <drm/display/drm_hdmi_state_helper.h>
#include <drm/display/drm_scdc_helper.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_edid.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/pm_runtime.h>
#include <linux/rational.h>
#include <linux/reset.h>
#include <sound/dmaengine_pcm.h>
#include <sound/hdmi-codec.h>
#include <sound/jack.h>
#include <sound/pcm_drm_eld.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include "media/cec.h"
#include "vc4_drv.h"
#include "vc4_hdmi.h"
#include "vc4_hdmi_regs.h"
#include "vc4_regs.h"

#define VC5_HDMI_HORZA_HFP_SHIFT  16
#define VC5_HDMI_HORZA_HFP_MASK   VC4_MASK(28, 16)
#define VC5_HDMI_HORZA_VPOS   BIT(15)
#define VC5_HDMI_HORZA_HPOS   BIT(14)
#define VC5_HDMI_HORZA_HAP_SHIFT  0
#define VC5_HDMI_HORZA_HAP_MASK   VC4_MASK(13, 0)

#define VC5_HDMI_HORZB_HBP_SHIFT  16
#define VC5_HDMI_HORZB_HBP_MASK   VC4_MASK(26, 16)
#define VC5_HDMI_HORZB_HSP_SHIFT  0
#define VC5_HDMI_HORZB_HSP_MASK   VC4_MASK(10, 0)

#define VC5_HDMI_VERTA_VSP_SHIFT  24
#define VC5_HDMI_VERTA_VSP_MASK   VC4_MASK(28, 24)
#define VC5_HDMI_VERTA_VFP_SHIFT  16
#define VC5_HDMI_VERTA_VFP_MASK   VC4_MASK(22, 16)
#define VC5_HDMI_VERTA_VAL_SHIFT  0
#define VC5_HDMI_VERTA_VAL_MASK   VC4_MASK(12, 0)

#define VC5_HDMI_VERTB_VSPO_SHIFT  16
#define VC5_HDMI_VERTB_VSPO_MASK  VC4_MASK(29, 16)

#define VC4_HDMI_MISC_CONTROL_PIXEL_REP_SHIFT 0
#define VC4_HDMI_MISC_CONTROL_PIXEL_REP_MASK VC4_MASK(3, 0)
#define VC5_HDMI_MISC_CONTROL_PIXEL_REP_SHIFT 0
#define VC5_HDMI_MISC_CONTROL_PIXEL_REP_MASK VC4_MASK(3, 0)

#define VC5_HDMI_SCRAMBLER_CTL_ENABLE  BIT(0)

#define VC5_HDMI_DEEP_COLOR_CONFIG_1_INIT_PACK_PHASE_SHIFT 8
#define VC5_HDMI_DEEP_COLOR_CONFIG_1_INIT_PACK_PHASE_MASK VC4_MASK(10, 8)

#define VC5_HDMI_DEEP_COLOR_CONFIG_1_COLOR_DEPTH_SHIFT  0
#define VC5_HDMI_DEEP_COLOR_CONFIG_1_COLOR_DEPTH_MASK  VC4_MASK(3, 0)

#define VC5_HDMI_GCP_CONFIG_GCP_ENABLE  BIT(31)

#define VC5_HDMI_GCP_WORD_1_GCP_SUBPACKET_BYTE_1_SHIFT 8
#define VC5_HDMI_GCP_WORD_1_GCP_SUBPACKET_BYTE_1_MASK VC4_MASK(15, 8)

#define VC5_HDMI_GCP_WORD_1_GCP_SUBPACKET_BYTE_0_MASK VC4_MASK(7, 0)
#define VC5_HDMI_GCP_WORD_1_GCP_SUBPACKET_BYTE_0_SET_AVMUTE BIT(0)
#define VC5_HDMI_GCP_WORD_1_GCP_SUBPACKET_BYTE_0_CLEAR_AVMUTE BIT(4)

# define VC4_HD_M_SW_RST   BIT(2)
# define VC4_HD_M_ENABLE   BIT(0)

#define HSM_MIN_CLOCK_FREQ 120000000
#define CEC_CLOCK_FREQ 40000

#define HDMI_14_MAX_TMDS_CLK   (340 * 1000 * 1000)

static bool vc4_hdmi_supports_scrambling(struct vc4_hdmi *vc4_hdmi)
{
 struct drm_display_info *display = &vc4_hdmi->connector.display_info;

 lockdep_assert_held(&vc4_hdmi->mutex);

 if (!display->is_hdmi)
  return false;

 if (!display->hdmi.scdc.supported ||
     !display->hdmi.scdc.scrambling.supported)
  return false;

 return true;
}

static bool vc4_hdmi_mode_needs_scrambling(const struct drm_display_mode *mode,
        unsigned int bpc,
        enum hdmi_colorspace fmt)
{
 unsigned long long clock = drm_hdmi_compute_mode_clock(mode, bpc, fmt);

 return clock > HDMI_14_MAX_TMDS_CLK;
}

static int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused)
{
 struct drm_debugfs_entry *entry = m->private;
 struct vc4_hdmi *vc4_hdmi = entry->file.data;
 struct drm_device *drm = vc4_hdmi->connector.dev;
 struct drm_printer p = drm_seq_file_printer(m);
 int idx;

 if (!drm_dev_enter(drm, &idx))
  return -ENODEV;

 WARN_ON(pm_runtime_resume_and_get(&vc4_hdmi->pdev->dev));

 drm_print_regset32(&p, &vc4_hdmi->hdmi_regset);
 drm_print_regset32(&p, &vc4_hdmi->hd_regset);
 drm_print_regset32(&p, &vc4_hdmi->cec_regset);
 drm_print_regset32(&p, &vc4_hdmi->csc_regset);
 drm_print_regset32(&p, &vc4_hdmi->dvp_regset);
 drm_print_regset32(&p, &vc4_hdmi->phy_regset);
 drm_print_regset32(&p, &vc4_hdmi->ram_regset);
 drm_print_regset32(&p, &vc4_hdmi->rm_regset);

 pm_runtime_put(&vc4_hdmi->pdev->dev);

 drm_dev_exit(idx);

 return 0;
}

static void vc4_hdmi_reset(struct vc4_hdmi *vc4_hdmi)
{
 struct drm_device *drm = vc4_hdmi->connector.dev;
 unsigned long flags;
 int idx;

 /*
 * We can be called by our bind callback, when the
 * connector->dev pointer might not be initialised yet.
 */
 if (drm && !drm_dev_enter(drm, &idx))
  return;

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

 HDMI_WRITE(HDMI_M_CTL, VC4_HD_M_SW_RST);
 udelay(1);
 HDMI_WRITE(HDMI_M_CTL, 0);

 HDMI_WRITE(HDMI_M_CTL, VC4_HD_M_ENABLE);

 HDMI_WRITE(HDMI_SW_RESET_CONTROL,
     VC4_HDMI_SW_RESET_HDMI |
     VC4_HDMI_SW_RESET_FORMAT_DETECT);

 HDMI_WRITE(HDMI_SW_RESET_CONTROL, 0);

 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 if (drm)
  drm_dev_exit(idx);
}

static void vc5_hdmi_reset(struct vc4_hdmi *vc4_hdmi)
{
 struct drm_device *drm = vc4_hdmi->connector.dev;
 unsigned long flags;
 int idx;

 /*
 * We can be called by our bind callback, when the
 * connector->dev pointer might not be initialised yet.
 */
 if (drm && !drm_dev_enter(drm, &idx))
  return;

 reset_control_reset(vc4_hdmi->reset);

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

 HDMI_WRITE(HDMI_DVP_CTL, 0);

 HDMI_WRITE(HDMI_CLOCK_STOP,
     HDMI_READ(HDMI_CLOCK_STOP) | VC4_DVP_HT_CLOCK_STOP_PIXEL);

 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 if (drm)
  drm_dev_exit(idx);
}

#ifdef CONFIG_DRM_VC4_HDMI_CEC
static void vc4_hdmi_cec_update_clk_div(struct vc4_hdmi *vc4_hdmi)
{
 struct drm_device *drm = vc4_hdmi->connector.dev;
 unsigned long cec_rate;
 unsigned long flags;
 u16 clk_cnt;
 u32 value;
 int idx;

 /*
 * This function is called by our runtime_resume implementation
 * and thus at bind time, when we haven't registered our
 * connector yet and thus don't have a pointer to the DRM
 * device.
 */
 if (drm && !drm_dev_enter(drm, &idx))
  return;

 cec_rate = clk_get_rate(vc4_hdmi->cec_clock);

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

 value = HDMI_READ(HDMI_CEC_CNTRL_1);
 value &= ~VC4_HDMI_CEC_DIV_CLK_CNT_MASK;

 /*
 * Set the clock divider: the hsm_clock rate and this divider
 * setting will give a 40 kHz CEC clock.
 */
 clk_cnt = cec_rate / CEC_CLOCK_FREQ;
 value |= clk_cnt << VC4_HDMI_CEC_DIV_CLK_CNT_SHIFT;
 HDMI_WRITE(HDMI_CEC_CNTRL_1, value);

 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 if (drm)
  drm_dev_exit(idx);
}
#else
static void vc4_hdmi_cec_update_clk_div(struct vc4_hdmi *vc4_hdmi) {}
#endif

static int vc4_hdmi_reset_link(struct drm_connector *connector,
          struct drm_modeset_acquire_ctx *ctx)
{
 struct drm_device *drm;
 struct vc4_hdmi *vc4_hdmi;
 struct drm_connector_state *conn_state;
 struct drm_crtc_state *crtc_state;
 struct drm_crtc *crtc;
 bool scrambling_needed;
 u8 config;
 int ret;

 if (!connector)
  return 0;

 drm = connector->dev;
 ret = drm_modeset_lock(&drm->mode_config.connection_mutex, ctx);
 if (ret)
  return ret;

 conn_state = connector->state;
 crtc = conn_state->crtc;
 if (!crtc)
  return 0;

 ret = drm_modeset_lock(&crtc->mutex, ctx);
 if (ret)
  return ret;

 crtc_state = crtc->state;
 if (!crtc_state->active)
  return 0;

 vc4_hdmi = connector_to_vc4_hdmi(connector);
 mutex_lock(&vc4_hdmi->mutex);

 if (!vc4_hdmi_supports_scrambling(vc4_hdmi)) {
  mutex_unlock(&vc4_hdmi->mutex);
  return 0;
 }

 scrambling_needed = vc4_hdmi_mode_needs_scrambling(&vc4_hdmi->saved_adjusted_mode,
          vc4_hdmi->output_bpc,
          vc4_hdmi->output_format);
 if (!scrambling_needed) {
  mutex_unlock(&vc4_hdmi->mutex);
  return 0;
 }

 if (conn_state->commit &&
     !try_wait_for_completion(&conn_state->commit->hw_done)) {
  mutex_unlock(&vc4_hdmi->mutex);
  return 0;
 }

 ret = drm_scdc_readb(connector->ddc, SCDC_TMDS_CONFIG, &config);
 if (ret < 0) {
  drm_err(drm, "Failed to read TMDS config: %d\n", ret);
  mutex_unlock(&vc4_hdmi->mutex);
  return 0;
 }

 if (!!(config & SCDC_SCRAMBLING_ENABLE) == scrambling_needed) {
  mutex_unlock(&vc4_hdmi->mutex);
  return 0;
 }

 mutex_unlock(&vc4_hdmi->mutex);

 /*
 * HDMI 2.0 says that one should not send scrambled data
 * prior to configuring the sink scrambling, and that
 * TMDS clock/data transmission should be suspended when
 * changing the TMDS clock rate in the sink. So let's
 * just do a full modeset here, even though some sinks
 * would be perfectly happy if were to just reconfigure
 * the SCDC settings on the fly.
 */
 return drm_atomic_helper_reset_crtc(crtc, ctx);
}

static void vc4_hdmi_handle_hotplug(struct vc4_hdmi *vc4_hdmi,
        struct drm_modeset_acquire_ctx *ctx,
        enum drm_connector_status status)
{
 struct drm_connector *connector = &vc4_hdmi->connector;
 int ret;

 /*
 * NOTE: This function should really be called with vc4_hdmi->mutex
 * held, but doing so results in reentrancy issues since
 * cec_s_phys_addr() might call .adap_enable, which leads to that
 * funtion being called with our mutex held.
 *
 * A similar situation occurs with vc4_hdmi_reset_link() that
 * will call into our KMS hooks if the scrambling was enabled.
 *
 * Concurrency isn't an issue at the moment since we don't share
 * any state with any of the other frameworks so we can ignore
 * the lock for now.
 */

 drm_atomic_helper_connector_hdmi_hotplug(connector, status);

 if (status == connector_status_disconnected) {
  cec_phys_addr_invalidate(vc4_hdmi->cec_adap);
  return;
 }

 cec_s_phys_addr(vc4_hdmi->cec_adap,
   connector->display_info.source_physical_address, false);

 if (status != connector_status_connected)
  return;

 for (;;) {
  ret = vc4_hdmi_reset_link(connector, ctx);
  if (ret == -EDEADLK) {
   drm_modeset_backoff(ctx);
   continue;
  }

  break;
 }
}

static int vc4_hdmi_connector_detect_ctx(struct drm_connector *connector,
      struct drm_modeset_acquire_ctx *ctx,
      bool force)
{
 struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
 enum drm_connector_status status = connector_status_disconnected;
 int ret;

 /*
 * NOTE: This function should really take vc4_hdmi->mutex, but
 * doing so results in reentrancy issues since
 * vc4_hdmi_handle_hotplug() can call into other functions that
 * would take the mutex while it's held here.
 *
 * Concurrency isn't an issue at the moment since we don't share
 * any state with any of the other frameworks so we can ignore
 * the lock for now.
 */

 ret = pm_runtime_resume_and_get(&vc4_hdmi->pdev->dev);
 if (ret) {
  drm_err_once(connector->dev, "Failed to retain HDMI power domain: %d\n",
        ret);
  return connector_status_unknown;
 }

 if (vc4_hdmi->hpd_gpio) {
  if (gpiod_get_value_cansleep(vc4_hdmi->hpd_gpio))
   status = connector_status_connected;
 } else {
  if (vc4_hdmi->variant->hp_detect &&
      vc4_hdmi->variant->hp_detect(vc4_hdmi))
   status = connector_status_connected;
 }

 vc4_hdmi_handle_hotplug(vc4_hdmi, ctx, status);
 pm_runtime_put(&vc4_hdmi->pdev->dev);

 return status;
}

static int vc4_hdmi_connector_get_modes(struct drm_connector *connector)
{
 struct vc4_dev *vc4 = to_vc4_dev(connector->dev);
 int ret = 0;

 ret = drm_edid_connector_add_modes(connector);

 if (!vc4->hvs->vc5_hdmi_enable_hdmi_20) {
  struct drm_device *drm = connector->dev;
  const struct drm_display_mode *mode;

  list_for_each_entry(mode, &connector->probed_modes, head) {
   if (vc4_hdmi_mode_needs_scrambling(mode, 8, HDMI_COLORSPACE_RGB)) {
    drm_warn_once(drm, "The core clock cannot reach frequencies high enough to support 4k @ 60Hz.");
    drm_warn_once(drm, "Please change your config.txt file to add hdmi_enable_4kp60.");
   }
  }
 }

 return ret;
}

static int vc4_hdmi_connector_atomic_check(struct drm_connector *connector,
        struct drm_atomic_state *state)
{
 struct drm_connector_state *old_state =
  drm_atomic_get_old_connector_state(state, connector);
 struct drm_connector_state *new_state =
  drm_atomic_get_new_connector_state(state, connector);
 struct drm_crtc *crtc = new_state->crtc;

 if (!crtc)
  return 0;

 if (old_state->tv.margins.left != new_state->tv.margins.left ||
     old_state->tv.margins.right != new_state->tv.margins.right ||
     old_state->tv.margins.top != new_state->tv.margins.top ||
     old_state->tv.margins.bottom != new_state->tv.margins.bottom) {
  struct drm_crtc_state *crtc_state;
  int ret;

  crtc_state = drm_atomic_get_crtc_state(state, crtc);
  if (IS_ERR(crtc_state))
   return PTR_ERR(crtc_state);

  /*
 * Strictly speaking, we should be calling
 * drm_atomic_helper_check_planes() after our call to
 * drm_atomic_add_affected_planes(). However, the
 * connector atomic_check is called as part of
 * drm_atomic_helper_check_modeset() that already
 * happens before a call to
 * drm_atomic_helper_check_planes() in
 * drm_atomic_helper_check().
 */
  ret = drm_atomic_add_affected_planes(state, crtc);
  if (ret)
   return ret;
 }

 if (old_state->colorspace != new_state->colorspace) {
  struct drm_crtc_state *crtc_state;

  crtc_state = drm_atomic_get_crtc_state(state, crtc);
  if (IS_ERR(crtc_state))
   return PTR_ERR(crtc_state);

  crtc_state->mode_changed = true;
 }

 return drm_atomic_helper_connector_hdmi_check(connector, state);
}

static void vc4_hdmi_connector_reset(struct drm_connector *connector)
{
 drm_atomic_helper_connector_reset(connector);
 __drm_atomic_helper_connector_hdmi_reset(connector, connector->state);
 drm_atomic_helper_connector_tv_margins_reset(connector);
}

static const struct drm_connector_funcs vc4_hdmi_connector_funcs = {
 .force = drm_atomic_helper_connector_hdmi_force,
 .fill_modes = drm_helper_probe_single_connector_modes,
 .reset = vc4_hdmi_connector_reset,
 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static const struct drm_connector_helper_funcs vc4_hdmi_connector_helper_funcs = {
 .detect_ctx = vc4_hdmi_connector_detect_ctx,
 .get_modes = vc4_hdmi_connector_get_modes,
 .atomic_check = vc4_hdmi_connector_atomic_check,
 .mode_valid = drm_hdmi_connector_mode_valid,
};

static const struct drm_connector_hdmi_funcs vc4_hdmi_hdmi_connector_funcs;
static const struct drm_connector_hdmi_audio_funcs vc4_hdmi_audio_funcs;

static int vc4_hdmi_connector_init(struct drm_device *dev,
       struct vc4_hdmi *vc4_hdmi)
{
 struct drm_connector *connector = &vc4_hdmi->connector;
 struct drm_encoder *encoder = &vc4_hdmi->encoder.base;
 unsigned int max_bpc = 8;
 int ret;

 if (vc4_hdmi->variant->supports_hdr)
  max_bpc = 12;

 ret = drmm_connector_hdmi_init(dev, connector,
           "Broadcom", "Videocore",
           &vc4_hdmi_connector_funcs,
           &vc4_hdmi_hdmi_connector_funcs,
           DRM_MODE_CONNECTOR_HDMIA,
           vc4_hdmi->ddc,
           BIT(HDMI_COLORSPACE_RGB) |
           BIT(HDMI_COLORSPACE_YUV422) |
           BIT(HDMI_COLORSPACE_YUV444),
           max_bpc);
 if (ret)
  return ret;

 ret = drm_connector_hdmi_audio_init(connector, dev->dev,
         &vc4_hdmi_audio_funcs,
         8, 0, false, -1);
 if (ret)
  return ret;

 drm_connector_helper_add(connector, &vc4_hdmi_connector_helper_funcs);

 /*
 * Some of the properties below require access to state, like bpc.
 * Allocate some default initial connector state with our reset helper.
 */
 if (connector->funcs->reset)
  connector->funcs->reset(connector);

 /* Create and attach TV margin props to this connector. */
 ret = drm_mode_create_tv_margin_properties(dev);
 if (ret)
  return ret;

 ret = drm_mode_create_hdmi_colorspace_property(connector, 0);
 if (ret)
  return ret;

 drm_connector_attach_colorspace_property(connector);
 drm_connector_attach_tv_margin_properties(connector);

 connector->polled = (DRM_CONNECTOR_POLL_CONNECT |
        DRM_CONNECTOR_POLL_DISCONNECT);

 connector->interlace_allowed = 1;
 connector->doublescan_allowed = 0;
 connector->stereo_allowed = 1;

 ret = drm_connector_attach_broadcast_rgb_property(connector);
 if (ret)
  return ret;

 drm_connector_attach_encoder(connector, encoder);

 return 0;
}

static int vc4_hdmi_stop_packet(struct vc4_hdmi *vc4_hdmi,
    enum hdmi_infoframe_type type,
    bool poll)
{
 struct drm_device *drm = vc4_hdmi->connector.dev;
 u32 packet_id = type - 0x80;
 unsigned long flags;
 int ret = 0;
 int idx;

 if (!drm_dev_enter(drm, &idx))
  return -ENODEV;

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
 HDMI_WRITE(HDMI_RAM_PACKET_CONFIG,
     HDMI_READ(HDMI_RAM_PACKET_CONFIG) & ~BIT(packet_id));
 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 if (poll) {
  ret = wait_for(!(HDMI_READ(HDMI_RAM_PACKET_STATUS) &
     BIT(packet_id)), 100);
 }

 drm_dev_exit(idx);
 return ret;
}

static int vc4_hdmi_write_infoframe(struct drm_connector *connector,
        enum hdmi_infoframe_type type,
        const u8 *infoframe, size_t len)
{
 struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
 struct drm_device *drm = connector->dev;
 u32 packet_id = type - 0x80;
 const struct vc4_hdmi_register *ram_packet_start =
  &vc4_hdmi->variant->registers[HDMI_RAM_PACKET_START];
 u32 packet_reg = ram_packet_start->offset + VC4_HDMI_PACKET_STRIDE * packet_id;
 u32 packet_reg_next = ram_packet_start->offset +
  VC4_HDMI_PACKET_STRIDE * (packet_id + 1);
 void __iomem *base = __vc4_hdmi_get_field_base(vc4_hdmi,
             ram_packet_start->reg);
 uint8_t buffer[VC4_HDMI_PACKET_STRIDE] = {};
 unsigned long flags;
 ssize_t i;
 int ret;
 int idx;

 if (!drm_dev_enter(drm, &idx))
  return 0;

 if (len > sizeof(buffer)) {
  ret = -ENOMEM;
  goto out;
 }

 memcpy(buffer, infoframe, len);

 WARN_ONCE(!(HDMI_READ(HDMI_RAM_PACKET_CONFIG) &
      VC4_HDMI_RAM_PACKET_ENABLE),
    "Packet RAM has to be on to store the packet.");

 ret = vc4_hdmi_stop_packet(vc4_hdmi, type, true);
 if (ret) {
  drm_err(drm, "Failed to wait for infoframe to go idle: %d\n", ret);
  goto out;
 }

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

 for (i = 0; i < len; i += 7) {
  writel(buffer[i + 0] << 0 |
         buffer[i + 1] << 8 |
         buffer[i + 2] << 16,
         base + packet_reg);
  packet_reg += 4;

  writel(buffer[i + 3] << 0 |
         buffer[i + 4] << 8 |
         buffer[i + 5] << 16 |
         buffer[i + 6] << 24,
         base + packet_reg);
  packet_reg += 4;
 }

 /*
 * clear remainder of packet ram as it's included in the
 * infoframe and triggers a checksum error on hdmi analyser
 */
 for (; packet_reg < packet_reg_next; packet_reg += 4)
  writel(0, base + packet_reg);

 HDMI_WRITE(HDMI_RAM_PACKET_CONFIG,
     HDMI_READ(HDMI_RAM_PACKET_CONFIG) | BIT(packet_id));

 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 ret = wait_for((HDMI_READ(HDMI_RAM_PACKET_STATUS) &
   BIT(packet_id)), 100);
 if (ret)
  drm_err(drm, "Failed to wait for infoframe to start: %d\n", ret);

out:
 drm_dev_exit(idx);
 return ret;
}

#define SCRAMBLING_POLLING_DELAY_MS 1000

static void vc4_hdmi_enable_scrambling(struct drm_encoder *encoder)
{
 struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
 struct drm_connector *connector = &vc4_hdmi->connector;
 struct drm_device *drm = connector->dev;
 const struct drm_display_mode *mode = &vc4_hdmi->saved_adjusted_mode;
 unsigned long flags;
 int idx;

 lockdep_assert_held(&vc4_hdmi->mutex);

 if (!vc4_hdmi_supports_scrambling(vc4_hdmi))
  return;

 if (!vc4_hdmi_mode_needs_scrambling(mode,
         vc4_hdmi->output_bpc,
         vc4_hdmi->output_format))
  return;

 if (!drm_dev_enter(drm, &idx))
  return;

 drm_scdc_set_high_tmds_clock_ratio(connector, true);
 drm_scdc_set_scrambling(connector, true);

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
 HDMI_WRITE(HDMI_SCRAMBLER_CTL, HDMI_READ(HDMI_SCRAMBLER_CTL) |
     VC5_HDMI_SCRAMBLER_CTL_ENABLE);
 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 drm_dev_exit(idx);

 vc4_hdmi->scdc_enabled = true;

 queue_delayed_work(system_wq, &vc4_hdmi->scrambling_work,
      msecs_to_jiffies(SCRAMBLING_POLLING_DELAY_MS));
}

static void vc4_hdmi_disable_scrambling(struct drm_encoder *encoder)
{
 struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
 struct drm_connector *connector = &vc4_hdmi->connector;
 struct drm_device *drm = connector->dev;
 unsigned long flags;
 int idx;

 lockdep_assert_held(&vc4_hdmi->mutex);

 if (!vc4_hdmi->scdc_enabled)
  return;

 vc4_hdmi->scdc_enabled = false;

 if (delayed_work_pending(&vc4_hdmi->scrambling_work))
  cancel_delayed_work_sync(&vc4_hdmi->scrambling_work);

 if (!drm_dev_enter(drm, &idx))
  return;

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
 HDMI_WRITE(HDMI_SCRAMBLER_CTL, HDMI_READ(HDMI_SCRAMBLER_CTL) &
     ~VC5_HDMI_SCRAMBLER_CTL_ENABLE);
 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 drm_scdc_set_scrambling(connector, false);
 drm_scdc_set_high_tmds_clock_ratio(connector, false);

 drm_dev_exit(idx);
}

static void vc4_hdmi_scrambling_wq(struct work_struct *work)
{
 struct vc4_hdmi *vc4_hdmi = container_of(to_delayed_work(work),
       struct vc4_hdmi,
       scrambling_work);
 struct drm_connector *connector = &vc4_hdmi->connector;

 if (drm_scdc_get_scrambling_status(connector))
  return;

 drm_scdc_set_high_tmds_clock_ratio(connector, true);
 drm_scdc_set_scrambling(connector, true);

 queue_delayed_work(system_wq, &vc4_hdmi->scrambling_work,
      msecs_to_jiffies(SCRAMBLING_POLLING_DELAY_MS));
}

static void vc4_hdmi_encoder_post_crtc_disable(struct drm_encoder *encoder,
            struct drm_atomic_state *state)
{
 struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
 struct drm_device *drm = vc4_hdmi->connector.dev;
 struct vc4_dev *vc4 = to_vc4_dev(drm);
 unsigned long flags;
 int idx;

 mutex_lock(&vc4_hdmi->mutex);

 vc4_hdmi->packet_ram_enabled = false;

 if (!drm_dev_enter(drm, &idx))
  goto out;

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

 HDMI_WRITE(HDMI_RAM_PACKET_CONFIG, 0);

 HDMI_WRITE(HDMI_VID_CTL, HDMI_READ(HDMI_VID_CTL) | VC4_HD_VID_CTL_CLRRGB);

 if (vc4->gen >= VC4_GEN_6_C)
  HDMI_WRITE(HDMI_VID_CTL, HDMI_READ(HDMI_VID_CTL) |
      VC4_HD_VID_CTL_BLANKPIX);

 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 mdelay(1);

 /*
 * TODO: This should work on BCM2712, but doesn't for some
 * reason and result in a system lockup.
 */
 if (vc4->gen < VC4_GEN_6_C) {
  spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
  HDMI_WRITE(HDMI_VID_CTL,
      HDMI_READ(HDMI_VID_CTL) &
      ~VC4_HD_VID_CTL_ENABLE);
  spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);
 }

 vc4_hdmi_disable_scrambling(encoder);

 drm_dev_exit(idx);

out:
 mutex_unlock(&vc4_hdmi->mutex);
}

static void vc4_hdmi_encoder_post_crtc_powerdown(struct drm_encoder *encoder,
       struct drm_atomic_state *state)
{
 struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
 struct drm_device *drm = vc4_hdmi->connector.dev;
 unsigned long flags;
 int ret;
 int idx;

 mutex_lock(&vc4_hdmi->mutex);

 if (!drm_dev_enter(drm, &idx))
  goto out;

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
 HDMI_WRITE(HDMI_VID_CTL,
     HDMI_READ(HDMI_VID_CTL) | VC4_HD_VID_CTL_BLANKPIX);
 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 if (vc4_hdmi->variant->phy_disable)
  vc4_hdmi->variant->phy_disable(vc4_hdmi);

 clk_disable_unprepare(vc4_hdmi->pixel_bvb_clock);
 clk_disable_unprepare(vc4_hdmi->pixel_clock);

 ret = pm_runtime_put(&vc4_hdmi->pdev->dev);
 if (ret < 0)
  drm_err(drm, "Failed to release power domain: %d\n", ret);

 drm_dev_exit(idx);

out:
 mutex_unlock(&vc4_hdmi->mutex);
}

static void vc4_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi,
          struct drm_connector_state *state,
          const struct drm_display_mode *mode)
{
 struct drm_device *drm = vc4_hdmi->connector.dev;
 unsigned long flags;
 u32 csc_ctl;
 int idx;

 if (!drm_dev_enter(drm, &idx))
  return;

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

 csc_ctl = VC4_SET_FIELD(VC4_HD_CSC_CTL_ORDER_BGR,
    VC4_HD_CSC_CTL_ORDER);

 if (state->hdmi.is_limited_range) {
  /* CEA VICs other than #1 requre limited range RGB
 * output unless overridden by an AVI infoframe.
 * Apply a colorspace conversion to squash 0-255 down
 * to 16-235.  The matrix here is:
 *
 * [ 0      0      0.8594 16]
 * [ 0      0.8594 0      16]
 * [ 0.8594 0      0      16]
 * [ 0      0      0       1]
 */
  csc_ctl |= VC4_HD_CSC_CTL_ENABLE;
  csc_ctl |= VC4_HD_CSC_CTL_RGB2YCC;
  csc_ctl |= VC4_SET_FIELD(VC4_HD_CSC_CTL_MODE_CUSTOM,
      VC4_HD_CSC_CTL_MODE);

  HDMI_WRITE(HDMI_CSC_12_11, (0x000 << 16) | 0x000);
  HDMI_WRITE(HDMI_CSC_14_13, (0x100 << 16) | 0x6e0);
  HDMI_WRITE(HDMI_CSC_22_21, (0x6e0 << 16) | 0x000);
  HDMI_WRITE(HDMI_CSC_24_23, (0x100 << 16) | 0x000);
  HDMI_WRITE(HDMI_CSC_32_31, (0x000 << 16) | 0x6e0);
  HDMI_WRITE(HDMI_CSC_34_33, (0x100 << 16) | 0x000);
 }

 /* The RGB order applies even when CSC is disabled. */
 HDMI_WRITE(HDMI_CSC_CTL, csc_ctl);

 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 drm_dev_exit(idx);
}

/*
 * Matrices for (internal) RGB to RGB output.
 *
 * Matrices are signed 2p13 fixed point, with signed 9p6 offsets
 */
static const u16 vc5_hdmi_csc_full_rgb_to_rgb[2][3][4] = {
 {
  /*
 * Full range - unity
 *
 * [ 1      0      0      0]
 * [ 0      1      0      0]
 * [ 0      0      1      0]
 */
  { 0x2000, 0x0000, 0x0000, 0x0000 },
  { 0x0000, 0x2000, 0x0000, 0x0000 },
  { 0x0000, 0x0000, 0x2000, 0x0000 },
 },
 {
  /*
 * Limited range
 *
 * CEA VICs other than #1 require limited range RGB
 * output unless overridden by an AVI infoframe. Apply a
 * colorspace conversion to squash 0-255 down to 16-235.
 * The matrix here is:
 *
 * [ 0.8594 0      0      16]
 * [ 0      0.8594 0      16]
 * [ 0      0      0.8594 16]
 */
  { 0x1b80, 0x0000, 0x0000, 0x0400 },
  { 0x0000, 0x1b80, 0x0000, 0x0400 },
  { 0x0000, 0x0000, 0x1b80, 0x0400 },
 },
};

/*
 * Conversion between Full Range RGB and YUV using the BT.601 Colorspace
 *
 * Matrices are signed 2p13 fixed point, with signed 9p6 offsets
 */
static const u16 vc5_hdmi_csc_full_rgb_to_yuv_bt601[2][3][4] = {
 {
  /*
 * Full Range
 *
 * [  0.299000  0.587000  0.114000  0   ]
 * [ -0.168736 -0.331264  0.500000  128 ]
 * [  0.500000 -0.418688 -0.081312  128 ]
 */
  { 0x0991, 0x12c9, 0x03a6, 0x0000 },
  { 0xfa9b, 0xf567, 0x1000, 0x2000 },
  { 0x1000, 0xf29b, 0xfd67, 0x2000 },
 },
 {
  /* Limited Range
 *
 * [  0.255785  0.502160  0.097523  16  ]
 * [ -0.147644 -0.289856  0.437500  128 ]
 * [  0.437500 -0.366352 -0.071148  128 ]
 */
  { 0x082f, 0x1012, 0x031f, 0x0400 },
  { 0xfb48, 0xf6ba, 0x0e00, 0x2000 },
  { 0x0e00, 0xf448, 0xfdba, 0x2000 },
 },
};

/*
 * Conversion between Full Range RGB and YUV using the BT.709 Colorspace
 *
 * Matrices are signed 2p13 fixed point, with signed 9p6 offsets
 */
static const u16 vc5_hdmi_csc_full_rgb_to_yuv_bt709[2][3][4] = {
 {
  /*
 * Full Range
 *
 * [  0.212600  0.715200  0.072200  0   ]
 * [ -0.114572 -0.385428  0.500000  128 ]
 * [  0.500000 -0.454153 -0.045847  128 ]
 */
  { 0x06ce, 0x16e3, 0x024f, 0x0000 },
  { 0xfc56, 0xf3ac, 0x1000, 0x2000 },
  { 0x1000, 0xf179, 0xfe89, 0x2000 },
 },
 {
  /*
 * Limited Range
 *
 * [  0.181906  0.611804  0.061758  16  ]
 * [ -0.100268 -0.337232  0.437500  128 ]
 * [  0.437500 -0.397386 -0.040114  128 ]
 */
  { 0x05d2, 0x1394, 0x01fa, 0x0400 },
  { 0xfccc, 0xf536, 0x0e00, 0x2000 },
  { 0x0e00, 0xf34a, 0xfeb8, 0x2000 },
 },
};

/*
 * Conversion between Full Range RGB and YUV using the BT.2020 Colorspace
 *
 * Matrices are signed 2p13 fixed point, with signed 9p6 offsets
 */
static const u16 vc5_hdmi_csc_full_rgb_to_yuv_bt2020[2][3][4] = {
 {
  /*
 * Full Range
 *
 * [  0.262700  0.678000  0.059300  0   ]
 * [ -0.139630 -0.360370  0.500000  128 ]
 * [  0.500000 -0.459786 -0.040214  128 ]
 */
  { 0x0868, 0x15b2, 0x01e6, 0x0000 },
  { 0xfb89, 0xf479, 0x1000, 0x2000 },
  { 0x1000, 0xf14a, 0xfeb8, 0x2000 },
 },
 {
  /* Limited Range
 *
 * [  0.224732  0.580008  0.050729  16  ]
 * [ -0.122176 -0.315324  0.437500  128 ]
 * [  0.437500 -0.402312 -0.035188  128 ]
 */
  { 0x082f, 0x1012, 0x031f, 0x0400 },
  { 0xfb48, 0xf6ba, 0x0e00, 0x2000 },
  { 0x0e00, 0xf448, 0xfdba, 0x2000 },
 },
};

static void vc5_hdmi_set_csc_coeffs(struct vc4_hdmi *vc4_hdmi,
        const u16 coeffs[3][4])
{
 lockdep_assert_held(&vc4_hdmi->hw_lock);

 HDMI_WRITE(HDMI_CSC_12_11, (coeffs[0][1] << 16) | coeffs[0][0]);
 HDMI_WRITE(HDMI_CSC_14_13, (coeffs[0][3] << 16) | coeffs[0][2]);
 HDMI_WRITE(HDMI_CSC_22_21, (coeffs[1][1] << 16) | coeffs[1][0]);
 HDMI_WRITE(HDMI_CSC_24_23, (coeffs[1][3] << 16) | coeffs[1][2]);
 HDMI_WRITE(HDMI_CSC_32_31, (coeffs[2][1] << 16) | coeffs[2][0]);
 HDMI_WRITE(HDMI_CSC_34_33, (coeffs[2][3] << 16) | coeffs[2][2]);
}

static void vc5_hdmi_set_csc_coeffs_swap(struct vc4_hdmi *vc4_hdmi,
      const u16 coeffs[3][4])
{
 lockdep_assert_held(&vc4_hdmi->hw_lock);

 /* YUV444 needs the CSC matrices using the channels in a different order */
 HDMI_WRITE(HDMI_CSC_12_11, (coeffs[1][1] << 16) | coeffs[1][0]);
 HDMI_WRITE(HDMI_CSC_14_13, (coeffs[1][3] << 16) | coeffs[1][2]);
 HDMI_WRITE(HDMI_CSC_22_21, (coeffs[2][1] << 16) | coeffs[2][0]);
 HDMI_WRITE(HDMI_CSC_24_23, (coeffs[2][3] << 16) | coeffs[2][2]);
 HDMI_WRITE(HDMI_CSC_32_31, (coeffs[0][1] << 16) | coeffs[0][0]);
 HDMI_WRITE(HDMI_CSC_34_33, (coeffs[0][3] << 16) | coeffs[0][2]);
}

static const u16
(*vc5_hdmi_find_yuv_csc_coeffs(struct vc4_hdmi *vc4_hdmi, u32 colorspace, bool limited))[4]
{
 switch (colorspace) {
 case DRM_MODE_COLORIMETRY_SMPTE_170M_YCC:
 case DRM_MODE_COLORIMETRY_XVYCC_601:
 case DRM_MODE_COLORIMETRY_SYCC_601:
 case DRM_MODE_COLORIMETRY_OPYCC_601:
 case DRM_MODE_COLORIMETRY_BT601_YCC:
  return vc5_hdmi_csc_full_rgb_to_yuv_bt601[limited];

 default:
 case DRM_MODE_COLORIMETRY_NO_DATA:
 case DRM_MODE_COLORIMETRY_BT709_YCC:
 case DRM_MODE_COLORIMETRY_XVYCC_709:
 case DRM_MODE_COLORIMETRY_RGB_WIDE_FIXED:
 case DRM_MODE_COLORIMETRY_RGB_WIDE_FLOAT:
  return vc5_hdmi_csc_full_rgb_to_yuv_bt709[limited];

 case DRM_MODE_COLORIMETRY_BT2020_CYCC:
 case DRM_MODE_COLORIMETRY_BT2020_YCC:
 case DRM_MODE_COLORIMETRY_BT2020_RGB:
 case DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65:
 case DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER:
  return vc5_hdmi_csc_full_rgb_to_yuv_bt2020[limited];
 }
}

static void vc5_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi,
          struct drm_connector_state *state,
          const struct drm_display_mode *mode)
{
 struct drm_device *drm = vc4_hdmi->connector.dev;
 unsigned int lim_range = state->hdmi.is_limited_range ? 1 : 0;
 unsigned long flags;
 const u16 (*csc)[4];
 u32 if_cfg = 0;
 u32 if_xbar = 0x543210;
 u32 csc_chan_ctl = 0;
 u32 csc_ctl = VC5_MT_CP_CSC_CTL_ENABLE | VC4_SET_FIELD(VC4_HD_CSC_CTL_MODE_CUSTOM,
              VC5_MT_CP_CSC_CTL_MODE);
 int idx;

 if (!drm_dev_enter(drm, &idx))
  return;

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

 switch (state->hdmi.output_format) {
 case HDMI_COLORSPACE_YUV444:
  csc = vc5_hdmi_find_yuv_csc_coeffs(vc4_hdmi, state->colorspace, !!lim_range);

  vc5_hdmi_set_csc_coeffs_swap(vc4_hdmi, csc);
  break;

 case HDMI_COLORSPACE_YUV422:
  csc = vc5_hdmi_find_yuv_csc_coeffs(vc4_hdmi, state->colorspace, !!lim_range);

  csc_ctl |= VC4_SET_FIELD(VC5_MT_CP_CSC_CTL_FILTER_MODE_444_TO_422_STANDARD,
      VC5_MT_CP_CSC_CTL_FILTER_MODE_444_TO_422) |
   VC5_MT_CP_CSC_CTL_USE_444_TO_422 |
   VC5_MT_CP_CSC_CTL_USE_RNG_SUPPRESSION;

  csc_chan_ctl |= VC4_SET_FIELD(VC5_MT_CP_CHANNEL_CTL_OUTPUT_REMAP_LEGACY_STYLE,
           VC5_MT_CP_CHANNEL_CTL_OUTPUT_REMAP);

  if_cfg |= VC4_SET_FIELD(VC5_DVP_HT_VEC_INTERFACE_CFG_SEL_422_FORMAT_422_LEGACY,
     VC5_DVP_HT_VEC_INTERFACE_CFG_SEL_422);

  vc5_hdmi_set_csc_coeffs(vc4_hdmi, csc);
  break;

 case HDMI_COLORSPACE_RGB:
  if_xbar = 0x354021;

  vc5_hdmi_set_csc_coeffs(vc4_hdmi, vc5_hdmi_csc_full_rgb_to_rgb[lim_range]);
  break;

 default:
  break;
 }

 HDMI_WRITE(HDMI_VEC_INTERFACE_CFG, if_cfg);
 HDMI_WRITE(HDMI_VEC_INTERFACE_XBAR, if_xbar);
 HDMI_WRITE(HDMI_CSC_CHANNEL_CTL, csc_chan_ctl);
 HDMI_WRITE(HDMI_CSC_CTL, csc_ctl);

 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 drm_dev_exit(idx);
}

static void vc4_hdmi_set_timings(struct vc4_hdmi *vc4_hdmi,
     struct drm_connector_state *state,
     const struct drm_display_mode *mode)
{
 struct drm_device *drm = vc4_hdmi->connector.dev;
 bool hsync_pos = mode->flags & DRM_MODE_FLAG_PHSYNC;
 bool vsync_pos = mode->flags & DRM_MODE_FLAG_PVSYNC;
 bool interlaced = mode->flags & DRM_MODE_FLAG_INTERLACE;
 u32 pixel_rep = (mode->flags & DRM_MODE_FLAG_DBLCLK) ? 2 : 1;
 u32 verta = (VC4_SET_FIELD(mode->crtc_vsync_end - mode->crtc_vsync_start,
       VC4_HDMI_VERTA_VSP) |
       VC4_SET_FIELD(mode->crtc_vsync_start - mode->crtc_vdisplay,
       VC4_HDMI_VERTA_VFP) |
       VC4_SET_FIELD(mode->crtc_vdisplay, VC4_HDMI_VERTA_VAL));
 u32 vertb = (VC4_SET_FIELD(0, VC4_HDMI_VERTB_VSPO) |
       VC4_SET_FIELD(mode->crtc_vtotal - mode->crtc_vsync_end +
       interlaced,
       VC4_HDMI_VERTB_VBP));
 u32 vertb_even = (VC4_SET_FIELD(0, VC4_HDMI_VERTB_VSPO) |
     VC4_SET_FIELD(mode->crtc_vtotal -
     mode->crtc_vsync_end,
     VC4_HDMI_VERTB_VBP));
 unsigned long flags;
 u32 reg;
 int idx;

 if (!drm_dev_enter(drm, &idx))
  return;

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

 HDMI_WRITE(HDMI_HORZA,
     (vsync_pos ? VC4_HDMI_HORZA_VPOS : 0) |
     (hsync_pos ? VC4_HDMI_HORZA_HPOS : 0) |
     VC4_SET_FIELD(mode->hdisplay * pixel_rep,
     VC4_HDMI_HORZA_HAP));

 HDMI_WRITE(HDMI_HORZB,
     VC4_SET_FIELD((mode->htotal -
      mode->hsync_end) * pixel_rep,
     VC4_HDMI_HORZB_HBP) |
     VC4_SET_FIELD((mode->hsync_end -
      mode->hsync_start) * pixel_rep,
     VC4_HDMI_HORZB_HSP) |
     VC4_SET_FIELD((mode->hsync_start -
      mode->hdisplay) * pixel_rep,
     VC4_HDMI_HORZB_HFP));

 HDMI_WRITE(HDMI_VERTA0, verta);
 HDMI_WRITE(HDMI_VERTA1, verta);

 HDMI_WRITE(HDMI_VERTB0, vertb_even);
 HDMI_WRITE(HDMI_VERTB1, vertb);

 reg = HDMI_READ(HDMI_MISC_CONTROL);
 reg &= ~VC4_HDMI_MISC_CONTROL_PIXEL_REP_MASK;
 reg |= VC4_SET_FIELD(pixel_rep - 1, VC4_HDMI_MISC_CONTROL_PIXEL_REP);
 HDMI_WRITE(HDMI_MISC_CONTROL, reg);

 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 drm_dev_exit(idx);
}

static void vc5_hdmi_set_timings(struct vc4_hdmi *vc4_hdmi,
     struct drm_connector_state *state,
     const struct drm_display_mode *mode)
{
 struct drm_device *drm = vc4_hdmi->connector.dev;
 bool hsync_pos = mode->flags & DRM_MODE_FLAG_PHSYNC;
 bool vsync_pos = mode->flags & DRM_MODE_FLAG_PVSYNC;
 bool interlaced = mode->flags & DRM_MODE_FLAG_INTERLACE;
 u32 pixel_rep = (mode->flags & DRM_MODE_FLAG_DBLCLK) ? 2 : 1;
 u32 verta = (VC4_SET_FIELD(mode->crtc_vsync_end - mode->crtc_vsync_start,
       VC5_HDMI_VERTA_VSP) |
       VC4_SET_FIELD(mode->crtc_vsync_start - mode->crtc_vdisplay,
       VC5_HDMI_VERTA_VFP) |
       VC4_SET_FIELD(mode->crtc_vdisplay, VC5_HDMI_VERTA_VAL));
 u32 vertb = (VC4_SET_FIELD(mode->htotal >> (2 - pixel_rep),
       VC5_HDMI_VERTB_VSPO) |
       VC4_SET_FIELD(mode->crtc_vtotal - mode->crtc_vsync_end +
       interlaced,
       VC4_HDMI_VERTB_VBP));
 u32 vertb_even = (VC4_SET_FIELD(0, VC5_HDMI_VERTB_VSPO) |
     VC4_SET_FIELD(mode->crtc_vtotal -
     mode->crtc_vsync_end,
     VC4_HDMI_VERTB_VBP));
 unsigned long flags;
 unsigned char gcp;
 u32 reg;
 int idx;

 if (!drm_dev_enter(drm, &idx))
  return;

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

 HDMI_WRITE(HDMI_HORZA,
     (vsync_pos ? VC5_HDMI_HORZA_VPOS : 0) |
     (hsync_pos ? VC5_HDMI_HORZA_HPOS : 0) |
     VC4_SET_FIELD(mode->hdisplay * pixel_rep,
     VC5_HDMI_HORZA_HAP) |
     VC4_SET_FIELD((mode->hsync_start -
      mode->hdisplay) * pixel_rep,
     VC5_HDMI_HORZA_HFP));

 HDMI_WRITE(HDMI_HORZB,
     VC4_SET_FIELD((mode->htotal -
      mode->hsync_end) * pixel_rep,
     VC5_HDMI_HORZB_HBP) |
     VC4_SET_FIELD((mode->hsync_end -
      mode->hsync_start) * pixel_rep,
     VC5_HDMI_HORZB_HSP));

 HDMI_WRITE(HDMI_VERTA0, verta);
 HDMI_WRITE(HDMI_VERTA1, verta);

 HDMI_WRITE(HDMI_VERTB0, vertb_even);
 HDMI_WRITE(HDMI_VERTB1, vertb);

 switch (state->hdmi.output_bpc) {
 case 12:
  gcp = 6;
  break;
 case 10:
  gcp = 5;
  break;
 case 8:
 default:
  gcp = 0;
  break;
 }

 /*
 * YCC422 is always 36-bit and not considered deep colour so
 * doesn't signal in GCP.
 */
 if (state->hdmi.output_format == HDMI_COLORSPACE_YUV422) {
  gcp = 0;
 }

 reg = HDMI_READ(HDMI_DEEP_COLOR_CONFIG_1);
 reg &= ~(VC5_HDMI_DEEP_COLOR_CONFIG_1_INIT_PACK_PHASE_MASK |
   VC5_HDMI_DEEP_COLOR_CONFIG_1_COLOR_DEPTH_MASK);
 reg |= VC4_SET_FIELD(2, VC5_HDMI_DEEP_COLOR_CONFIG_1_INIT_PACK_PHASE) |
        VC4_SET_FIELD(gcp, VC5_HDMI_DEEP_COLOR_CONFIG_1_COLOR_DEPTH);
 HDMI_WRITE(HDMI_DEEP_COLOR_CONFIG_1, reg);

 reg = HDMI_READ(HDMI_GCP_WORD_1);
 reg &= ~VC5_HDMI_GCP_WORD_1_GCP_SUBPACKET_BYTE_1_MASK;
 reg |= VC4_SET_FIELD(gcp, VC5_HDMI_GCP_WORD_1_GCP_SUBPACKET_BYTE_1);
 reg &= ~VC5_HDMI_GCP_WORD_1_GCP_SUBPACKET_BYTE_0_MASK;
 reg |= VC5_HDMI_GCP_WORD_1_GCP_SUBPACKET_BYTE_0_CLEAR_AVMUTE;
 HDMI_WRITE(HDMI_GCP_WORD_1, reg);

 reg = HDMI_READ(HDMI_GCP_CONFIG);
 reg |= VC5_HDMI_GCP_CONFIG_GCP_ENABLE;
 HDMI_WRITE(HDMI_GCP_CONFIG, reg);

 reg = HDMI_READ(HDMI_MISC_CONTROL);
 reg &= ~VC5_HDMI_MISC_CONTROL_PIXEL_REP_MASK;
 reg |= VC4_SET_FIELD(pixel_rep - 1, VC5_HDMI_MISC_CONTROL_PIXEL_REP);
 HDMI_WRITE(HDMI_MISC_CONTROL, reg);

 HDMI_WRITE(HDMI_CLOCK_STOP, 0);

 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 drm_dev_exit(idx);
}

static void vc4_hdmi_recenter_fifo(struct vc4_hdmi *vc4_hdmi)
{
 struct drm_device *drm = vc4_hdmi->connector.dev;
 unsigned long flags;
 u32 drift;
 int ret;
 int idx;

 if (!drm_dev_enter(drm, &idx))
  return;

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

 drift = HDMI_READ(HDMI_FIFO_CTL);
 drift &= VC4_HDMI_FIFO_VALID_WRITE_MASK;

 HDMI_WRITE(HDMI_FIFO_CTL,
     drift & ~VC4_HDMI_FIFO_CTL_RECENTER);
 HDMI_WRITE(HDMI_FIFO_CTL,
     drift | VC4_HDMI_FIFO_CTL_RECENTER);

 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 usleep_range(1000, 1100);

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

 HDMI_WRITE(HDMI_FIFO_CTL,
     drift & ~VC4_HDMI_FIFO_CTL_RECENTER);
 HDMI_WRITE(HDMI_FIFO_CTL,
     drift | VC4_HDMI_FIFO_CTL_RECENTER);

 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 ret = wait_for(HDMI_READ(HDMI_FIFO_CTL) &
         VC4_HDMI_FIFO_CTL_RECENTER_DONE, 1);
 WARN_ONCE(ret, "Timeout waiting for "
    "VC4_HDMI_FIFO_CTL_RECENTER_DONE");

 drm_dev_exit(idx);
}

static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
      struct drm_atomic_state *state)
{
 struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
 struct drm_device *drm = vc4_hdmi->connector.dev;
 struct drm_connector *connector = &vc4_hdmi->connector;
 struct drm_connector_state *conn_state =
  drm_atomic_get_new_connector_state(state, connector);
 const struct drm_display_mode *mode = &vc4_hdmi->saved_adjusted_mode;
 unsigned long long tmds_char_rate = conn_state->hdmi.tmds_char_rate;
 unsigned long bvb_rate, hsm_rate;
 unsigned long flags;
 int ret;
 int idx;

 mutex_lock(&vc4_hdmi->mutex);

 if (!drm_dev_enter(drm, &idx))
  goto out;

 ret = pm_runtime_resume_and_get(&vc4_hdmi->pdev->dev);
 if (ret < 0) {
  drm_err(drm, "Failed to retain power domain: %d\n", ret);
  goto err_dev_exit;
 }

 /*
 * As stated in RPi's vc4 firmware "HDMI state machine (HSM) clock must
 * be faster than pixel clock, infinitesimally faster, tested in
 * simulation. Otherwise, exact value is unimportant for HDMI
 * operation." This conflicts with bcm2835's vc4 documentation, which
 * states HSM's clock has to be at least 108% of the pixel clock.
 *
 * Real life tests reveal that vc4's firmware statement holds up, and
 * users are able to use pixel clocks closer to HSM's, namely for
 * 1920x1200@60Hz. So it was decided to have leave a 1% margin between
 * both clocks. Which, for RPi0-3 implies a maximum pixel clock of
 * 162MHz.
 *
 * Additionally, the AXI clock needs to be at least 25% of
 * pixel clock, but HSM ends up being the limiting factor.
 */
 hsm_rate = max_t(unsigned long,
    HSM_MIN_CLOCK_FREQ,
    div_u64(tmds_char_rate, 100) * 101);
 ret = clk_set_min_rate(vc4_hdmi->hsm_clock, hsm_rate);
 if (ret) {
  drm_err(drm, "Failed to set HSM clock rate: %d\n", ret);
  goto err_put_runtime_pm;
 }

 ret = clk_set_rate(vc4_hdmi->pixel_clock, tmds_char_rate);
 if (ret) {
  drm_err(drm, "Failed to set pixel clock rate: %d\n", ret);
  goto err_put_runtime_pm;
 }

 ret = clk_prepare_enable(vc4_hdmi->pixel_clock);
 if (ret) {
  drm_err(drm, "Failed to turn on pixel clock: %d\n", ret);
  goto err_put_runtime_pm;
 }

 vc4_hdmi_cec_update_clk_div(vc4_hdmi);

 if (tmds_char_rate > 297000000)
  bvb_rate = 300000000;
 else if (tmds_char_rate > 148500000)
  bvb_rate = 150000000;
 else
  bvb_rate = 75000000;

 ret = clk_set_min_rate(vc4_hdmi->pixel_bvb_clock, bvb_rate);
 if (ret) {
  drm_err(drm, "Failed to set pixel bvb clock rate: %d\n", ret);
  goto err_disable_pixel_clock;
 }

 ret = clk_prepare_enable(vc4_hdmi->pixel_bvb_clock);
 if (ret) {
  drm_err(drm, "Failed to turn on pixel bvb clock: %d\n", ret);
  goto err_disable_pixel_clock;
 }

 if (vc4_hdmi->variant->phy_init)
  vc4_hdmi->variant->phy_init(vc4_hdmi, conn_state);

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

 HDMI_WRITE(HDMI_SCHEDULER_CONTROL,
     HDMI_READ(HDMI_SCHEDULER_CONTROL) |
     VC4_HDMI_SCHEDULER_CONTROL_MANUAL_FORMAT |
     VC4_HDMI_SCHEDULER_CONTROL_IGNORE_VSYNC_PREDICTS);

 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 if (vc4_hdmi->variant->set_timings)
  vc4_hdmi->variant->set_timings(vc4_hdmi, conn_state, mode);

 drm_dev_exit(idx);

 mutex_unlock(&vc4_hdmi->mutex);

 return;

err_disable_pixel_clock:
 clk_disable_unprepare(vc4_hdmi->pixel_clock);
err_put_runtime_pm:
 pm_runtime_put(&vc4_hdmi->pdev->dev);
err_dev_exit:
 drm_dev_exit(idx);
out:
 mutex_unlock(&vc4_hdmi->mutex);
 return;
}

static void vc4_hdmi_encoder_pre_crtc_enable(struct drm_encoder *encoder,
          struct drm_atomic_state *state)
{
 struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
 struct drm_device *drm = vc4_hdmi->connector.dev;
 struct drm_connector *connector = &vc4_hdmi->connector;
 const struct drm_display_mode *mode = &vc4_hdmi->saved_adjusted_mode;
 struct drm_connector_state *conn_state =
  drm_atomic_get_new_connector_state(state, connector);
 unsigned long flags;
 int idx;

 mutex_lock(&vc4_hdmi->mutex);

 if (!drm_dev_enter(drm, &idx))
  goto out;

 if (vc4_hdmi->variant->csc_setup)
  vc4_hdmi->variant->csc_setup(vc4_hdmi, conn_state, mode);

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
 HDMI_WRITE(HDMI_FIFO_CTL, VC4_HDMI_FIFO_CTL_MASTER_SLAVE_N);
 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 drm_dev_exit(idx);

out:
 mutex_unlock(&vc4_hdmi->mutex);
}

static void vc4_hdmi_encoder_post_crtc_enable(struct drm_encoder *encoder,
           struct drm_atomic_state *state)
{
 struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
 struct drm_connector *connector = &vc4_hdmi->connector;
 struct drm_device *drm = connector->dev;
 const struct drm_display_mode *mode = &vc4_hdmi->saved_adjusted_mode;
 struct drm_display_info *display = &vc4_hdmi->connector.display_info;
 bool hsync_pos = mode->flags & DRM_MODE_FLAG_PHSYNC;
 bool vsync_pos = mode->flags & DRM_MODE_FLAG_PVSYNC;
 unsigned long flags;
 int ret;
 int idx;

 mutex_lock(&vc4_hdmi->mutex);

 if (!drm_dev_enter(drm, &idx))
  goto out;

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

 HDMI_WRITE(HDMI_VID_CTL,
     (HDMI_READ(HDMI_VID_CTL) &
   ~(VC4_HD_VID_CTL_VSYNC_LOW | VC4_HD_VID_CTL_HSYNC_LOW)) |
     VC4_HD_VID_CTL_ENABLE |
     VC4_HD_VID_CTL_CLRRGB |
     VC4_HD_VID_CTL_UNDERFLOW_ENABLE |
     VC4_HD_VID_CTL_FRAME_COUNTER_RESET |
     VC4_HD_VID_CTL_BLANK_INSERT_EN |
     (vsync_pos ? 0 : VC4_HD_VID_CTL_VSYNC_LOW) |
     (hsync_pos ? 0 : VC4_HD_VID_CTL_HSYNC_LOW));

 HDMI_WRITE(HDMI_VID_CTL,
     HDMI_READ(HDMI_VID_CTL) & ~VC4_HD_VID_CTL_BLANKPIX);

 if (display->is_hdmi) {
  HDMI_WRITE(HDMI_SCHEDULER_CONTROL,
      HDMI_READ(HDMI_SCHEDULER_CONTROL) |
      VC4_HDMI_SCHEDULER_CONTROL_MODE_HDMI);

  spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

  ret = wait_for(HDMI_READ(HDMI_SCHEDULER_CONTROL) &
          VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE, 1000);
  WARN_ONCE(ret, "Timeout waiting for "
     "VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE\n");
 } else {
  HDMI_WRITE(HDMI_RAM_PACKET_CONFIG,
      HDMI_READ(HDMI_RAM_PACKET_CONFIG) &
      ~(VC4_HDMI_RAM_PACKET_ENABLE));
  HDMI_WRITE(HDMI_SCHEDULER_CONTROL,
      HDMI_READ(HDMI_SCHEDULER_CONTROL) &
      ~VC4_HDMI_SCHEDULER_CONTROL_MODE_HDMI);

  spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

  ret = wait_for(!(HDMI_READ(HDMI_SCHEDULER_CONTROL) &
     VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE), 1000);
  WARN_ONCE(ret, "Timeout waiting for "
     "!VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE\n");
 }

 if (display->is_hdmi) {
  spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

  WARN_ON(!(HDMI_READ(HDMI_SCHEDULER_CONTROL) &
     VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE));

  HDMI_WRITE(HDMI_RAM_PACKET_CONFIG,
      VC4_HDMI_RAM_PACKET_ENABLE);

  spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);
  vc4_hdmi->packet_ram_enabled = true;

  drm_atomic_helper_connector_hdmi_update_infoframes(connector, state);
 }

 vc4_hdmi_recenter_fifo(vc4_hdmi);
 vc4_hdmi_enable_scrambling(encoder);

 drm_dev_exit(idx);

out:
 mutex_unlock(&vc4_hdmi->mutex);
}

static void vc4_hdmi_encoder_atomic_mode_set(struct drm_encoder *encoder,
          struct drm_crtc_state *crtc_state,
          struct drm_connector_state *conn_state)
{
 struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);

 mutex_lock(&vc4_hdmi->mutex);
 drm_mode_copy(&vc4_hdmi->saved_adjusted_mode,
        &crtc_state->adjusted_mode);
 vc4_hdmi->output_bpc = conn_state->hdmi.output_bpc;
 vc4_hdmi->output_format = conn_state->hdmi.output_format;
 mutex_unlock(&vc4_hdmi->mutex);
}

static enum drm_mode_status
vc4_hdmi_connector_clock_valid(const struct drm_connector *connector,
          const struct drm_display_mode *mode,
          unsigned long long clock)
{
 const struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
 struct vc4_dev *vc4 = to_vc4_dev(connector->dev);

 if (clock > vc4_hdmi->variant->max_pixel_clock)
  return MODE_CLOCK_HIGH;

 if (!vc4->hvs->vc5_hdmi_enable_hdmi_20 && clock > HDMI_14_MAX_TMDS_CLK)
  return MODE_CLOCK_HIGH;

 /* 4096x2160@60 is not reliable without overclocking core */
 if (!vc4->hvs->vc5_hdmi_enable_4096by2160 &&
     mode->hdisplay > 3840 && mode->vdisplay >= 2160 &&
     drm_mode_vrefresh(mode) >= 50)
  return MODE_CLOCK_HIGH;

 return MODE_OK;
}

static const struct drm_connector_hdmi_funcs vc4_hdmi_hdmi_connector_funcs = {
 .tmds_char_rate_valid = vc4_hdmi_connector_clock_valid,
 .write_infoframe = vc4_hdmi_write_infoframe,
};

#define WIFI_2_4GHz_CH1_MIN_FREQ 2400000000ULL
#define WIFI_2_4GHz_CH1_MAX_FREQ 2422000000ULL

static int vc4_hdmi_encoder_atomic_check(struct drm_encoder *encoder,
      struct drm_crtc_state *crtc_state,
      struct drm_connector_state *conn_state)
{
 struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
 struct drm_display_mode *mode = &crtc_state->adjusted_mode;
 unsigned long long tmds_char_rate = mode->clock * 1000;
 unsigned long long tmds_bit_rate;

 if (vc4_hdmi->variant->unsupported_odd_h_timings) {
  if (mode->flags & DRM_MODE_FLAG_DBLCLK) {
   /* Only try to fixup DBLCLK modes to get 480i and 576i
 * working.
 * A generic solution for all modes with odd horizontal
 * timing values seems impossible based on trying to
 * solve it for 1366x768 monitors.
 */
   if ((mode->hsync_start - mode->hdisplay) & 1)
    mode->hsync_start--;
   if ((mode->hsync_end - mode->hsync_start) & 1)
    mode->hsync_end--;
  }

  /* Now check whether we still have odd values remaining */
  if ((mode->hdisplay % 2) || (mode->hsync_start % 2) ||
      (mode->hsync_end % 2) || (mode->htotal % 2))
   return -EINVAL;
 }

 /*
 * The 1440p@60 pixel rate is in the same range than the first
 * WiFi channel (between 2.4GHz and 2.422GHz with 22MHz
 * bandwidth). Slightly lower the frequency to bring it out of
 * the WiFi range.
 */
 tmds_bit_rate = tmds_char_rate * 10;
 if (vc4_hdmi->disable_wifi_frequencies &&
     (tmds_bit_rate >= WIFI_2_4GHz_CH1_MIN_FREQ &&
      tmds_bit_rate <= WIFI_2_4GHz_CH1_MAX_FREQ)) {
  mode->clock = 238560;
  tmds_char_rate = mode->clock * 1000;
 }

 return 0;
}

static enum drm_mode_status
vc4_hdmi_encoder_mode_valid(struct drm_encoder *encoder,
       const struct drm_display_mode *mode)
{
 struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);

 if (vc4_hdmi->variant->unsupported_odd_h_timings &&
     !(mode->flags & DRM_MODE_FLAG_DBLCLK) &&
     ((mode->hdisplay % 2) || (mode->hsync_start % 2) ||
      (mode->hsync_end % 2) || (mode->htotal % 2)))
  return MODE_H_ILLEGAL;

 return MODE_OK;
}

static const struct drm_encoder_helper_funcs vc4_hdmi_encoder_helper_funcs = {
 .atomic_check = vc4_hdmi_encoder_atomic_check,
 .atomic_mode_set = vc4_hdmi_encoder_atomic_mode_set,
 .mode_valid = vc4_hdmi_encoder_mode_valid,
};

static int vc4_hdmi_late_register(struct drm_encoder *encoder)
{
 struct drm_device *drm = encoder->dev;
 struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
 const struct vc4_hdmi_variant *variant = vc4_hdmi->variant;

 drm_debugfs_add_file(drm, variant->debugfs_name,
        vc4_hdmi_debugfs_regs, vc4_hdmi);

 return 0;
}

static const struct drm_encoder_funcs vc4_hdmi_encoder_funcs = {
 .late_register = vc4_hdmi_late_register,
};

static u32 vc4_hdmi_channel_map(struct vc4_hdmi *vc4_hdmi, u32 channel_mask)
{
 int i;
 u32 channel_map = 0;

 for (i = 0; i < 8; i++) {
  if (channel_mask & BIT(i))
   channel_map |= i << (3 * i);
 }
 return channel_map;
}

static u32 vc5_hdmi_channel_map(struct vc4_hdmi *vc4_hdmi, u32 channel_mask)
{
 int i;
 u32 channel_map = 0;

 for (i = 0; i < 8; i++) {
  if (channel_mask & BIT(i))
   channel_map |= i << (4 * i);
 }
 return channel_map;
}

static bool vc5_hdmi_hp_detect(struct vc4_hdmi *vc4_hdmi)
{
 struct drm_device *drm = vc4_hdmi->connector.dev;
 unsigned long flags;
 u32 hotplug;
 int idx;

 if (!drm_dev_enter(drm, &idx))
  return false;

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
 hotplug = HDMI_READ(HDMI_HOTPLUG);
 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 drm_dev_exit(idx);

 return !!(hotplug & VC4_HDMI_HOTPLUG_CONNECTED);
}

/* HDMI audio codec callbacks */
static void vc4_hdmi_audio_set_mai_clock(struct vc4_hdmi *vc4_hdmi,
      unsigned int samplerate)
{
 struct drm_device *drm = vc4_hdmi->connector.dev;
 u32 hsm_clock;
 unsigned long flags;
 unsigned long n, m;
 int idx;

 if (!drm_dev_enter(drm, &idx))
  return;

 hsm_clock = clk_get_rate(vc4_hdmi->audio_clock);
 rational_best_approximation(hsm_clock, samplerate,
        VC4_HD_MAI_SMP_N_MASK >>
        VC4_HD_MAI_SMP_N_SHIFT,
        (VC4_HD_MAI_SMP_M_MASK >>
         VC4_HD_MAI_SMP_M_SHIFT) + 1,
        &n, &m);

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
 HDMI_WRITE(HDMI_MAI_SMP,
     VC4_SET_FIELD(n, VC4_HD_MAI_SMP_N) |
     VC4_SET_FIELD(m - 1, VC4_HD_MAI_SMP_M));
 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 drm_dev_exit(idx);
}

static void vc4_hdmi_set_n_cts(struct vc4_hdmi *vc4_hdmi, unsigned int samplerate)
{
 const struct drm_display_mode *mode = &vc4_hdmi->saved_adjusted_mode;
 u32 n, cts;
 u64 tmp;

 lockdep_assert_held(&vc4_hdmi->mutex);
 lockdep_assert_held(&vc4_hdmi->hw_lock);

 n = 128 * samplerate / 1000;
 tmp = (u64)(mode->clock * 1000) * n;
 do_div(tmp, 128 * samplerate);
 cts = tmp;

 HDMI_WRITE(HDMI_CRP_CFG,
     VC4_HDMI_CRP_CFG_EXTERNAL_CTS_EN |
     VC4_SET_FIELD(n, VC4_HDMI_CRP_CFG_N));

 /*
 * We could get slightly more accurate clocks in some cases by
 * providing a CTS_1 value.  The two CTS values are alternated
 * between based on the period fields
 */
 HDMI_WRITE(HDMI_CTS_0, cts);
 HDMI_WRITE(HDMI_CTS_1, cts);
}

static inline struct vc4_hdmi *dai_to_hdmi(struct snd_soc_dai *dai)
{
 struct snd_soc_card *card = snd_soc_dai_get_drvdata(dai);

 return snd_soc_card_get_drvdata(card);
}

static bool vc4_hdmi_audio_can_stream(struct vc4_hdmi *vc4_hdmi)
{
 struct drm_display_info *display = &vc4_hdmi->connector.display_info;

 lockdep_assert_held(&vc4_hdmi->mutex);

 /*
 * If the encoder is currently in DVI mode, treat the codec DAI
 * as missing.
 */
 if (!display->is_hdmi)
  return false;

 return true;
}

static int vc4_hdmi_audio_startup(struct drm_connector *connector)
{
 struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
 struct drm_device *drm = vc4_hdmi->connector.dev;
 unsigned long flags;
 int ret = 0;
 int idx;

 mutex_lock(&vc4_hdmi->mutex);

 if (!drm_dev_enter(drm, &idx)) {
  ret = -ENODEV;
  goto out;
 }

 if (!vc4_hdmi_audio_can_stream(vc4_hdmi)) {
  ret = -ENOTSUPP;
  goto out_dev_exit;
 }

 vc4_hdmi->audio.streaming = true;

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
 HDMI_WRITE(HDMI_MAI_CTL,
     VC4_HD_MAI_CTL_RESET |
     VC4_HD_MAI_CTL_FLUSH |
     VC4_HD_MAI_CTL_DLATE |
     VC4_HD_MAI_CTL_ERRORE |
     VC4_HD_MAI_CTL_ERRORF);
 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 if (vc4_hdmi->variant->phy_rng_enable)
  vc4_hdmi->variant->phy_rng_enable(vc4_hdmi);

out_dev_exit:
 drm_dev_exit(idx);
out:
 mutex_unlock(&vc4_hdmi->mutex);

 return ret;
}

static void vc4_hdmi_audio_reset(struct vc4_hdmi *vc4_hdmi)
{
 struct device *dev = &vc4_hdmi->pdev->dev;
 unsigned long flags;
 int ret;

 lockdep_assert_held(&vc4_hdmi->mutex);

 vc4_hdmi->audio.streaming = false;
 ret = vc4_hdmi_stop_packet(vc4_hdmi, HDMI_INFOFRAME_TYPE_AUDIO, false);
 if (ret)
  dev_err(dev, "Failed to stop audio infoframe: %d\n", ret);

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

 HDMI_WRITE(HDMI_MAI_CTL, VC4_HD_MAI_CTL_RESET);
 HDMI_WRITE(HDMI_MAI_CTL, VC4_HD_MAI_CTL_ERRORF);
 HDMI_WRITE(HDMI_MAI_CTL, VC4_HD_MAI_CTL_FLUSH);

 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);
}

static void vc4_hdmi_audio_shutdown(struct drm_connector *connector)
{
 struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
 struct drm_device *drm = vc4_hdmi->connector.dev;
 unsigned long flags;
 int idx;

 mutex_lock(&vc4_hdmi->mutex);

 if (!drm_dev_enter(drm, &idx))
  goto out;

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);

 HDMI_WRITE(HDMI_MAI_CTL,
     VC4_HD_MAI_CTL_DLATE |
     VC4_HD_MAI_CTL_ERRORE |
     VC4_HD_MAI_CTL_ERRORF);

 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 if (vc4_hdmi->variant->phy_rng_disable)
  vc4_hdmi->variant->phy_rng_disable(vc4_hdmi);

 vc4_hdmi->audio.streaming = false;
 vc4_hdmi_audio_reset(vc4_hdmi);

 drm_dev_exit(idx);

out:
 mutex_unlock(&vc4_hdmi->mutex);
}

static int sample_rate_to_mai_fmt(int samplerate)
{
 switch (samplerate) {
 case 8000:
  return VC4_HDMI_MAI_SAMPLE_RATE_8000;
 case 11025:
  return VC4_HDMI_MAI_SAMPLE_RATE_11025;
 case 12000:
  return VC4_HDMI_MAI_SAMPLE_RATE_12000;
 case 16000:
  return VC4_HDMI_MAI_SAMPLE_RATE_16000;
 case 22050:
  return VC4_HDMI_MAI_SAMPLE_RATE_22050;
 case 24000:
  return VC4_HDMI_MAI_SAMPLE_RATE_24000;
 case 32000:
  return VC4_HDMI_MAI_SAMPLE_RATE_32000;
 case 44100:
  return VC4_HDMI_MAI_SAMPLE_RATE_44100;
 case 48000:
  return VC4_HDMI_MAI_SAMPLE_RATE_48000;
 case 64000:
  return VC4_HDMI_MAI_SAMPLE_RATE_64000;
 case 88200:
  return VC4_HDMI_MAI_SAMPLE_RATE_88200;
 case 96000:
  return VC4_HDMI_MAI_SAMPLE_RATE_96000;
 case 128000:
  return VC4_HDMI_MAI_SAMPLE_RATE_128000;
 case 176400:
  return VC4_HDMI_MAI_SAMPLE_RATE_176400;
 case 192000:
  return VC4_HDMI_MAI_SAMPLE_RATE_192000;
 default:
  return VC4_HDMI_MAI_SAMPLE_RATE_NOT_INDICATED;
 }
}

/* HDMI audio codec callbacks */
static int vc4_hdmi_audio_prepare(struct drm_connector *connector,
      struct hdmi_codec_daifmt *daifmt,
      struct hdmi_codec_params *params)
{
 struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
 struct drm_device *drm = vc4_hdmi->connector.dev;
 struct vc4_dev *vc4 = to_vc4_dev(drm);
 unsigned int sample_rate = params->sample_rate;
 unsigned int channels = params->channels;
 unsigned long flags;
 u32 audio_packet_config, channel_mask;
 u32 channel_map;
 u32 mai_audio_format;
 u32 mai_sample_rate;
 int ret = 0;
 int idx;

 dev_dbg(&vc4_hdmi->pdev->dev, "%s: %u Hz, %d bit, %d channels\n", __func__,
  sample_rate, params->sample_width, channels);

 mutex_lock(&vc4_hdmi->mutex);

 if (!drm_dev_enter(drm, &idx)) {
  ret = -ENODEV;
  goto out;
 }

 if (!vc4_hdmi_audio_can_stream(vc4_hdmi)) {
  ret = -EINVAL;
  goto out_dev_exit;
 }

 vc4_hdmi_audio_set_mai_clock(vc4_hdmi, sample_rate);

 spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
 HDMI_WRITE(HDMI_MAI_CTL,
     VC4_SET_FIELD(channels, VC4_HD_MAI_CTL_CHNUM) |
     VC4_HD_MAI_CTL_WHOLSMP |
     VC4_HD_MAI_CTL_CHALIGN |
     VC4_HD_MAI_CTL_ENABLE);

 mai_sample_rate = sample_rate_to_mai_fmt(sample_rate);
 if (params->iec.status[0] & IEC958_AES0_NONAUDIO &&
     params->channels == 8)
  mai_audio_format = VC4_HDMI_MAI_FORMAT_HBR;
 else
  mai_audio_format = VC4_HDMI_MAI_FORMAT_PCM;
 HDMI_WRITE(HDMI_MAI_FMT,
     VC4_SET_FIELD(mai_sample_rate,
     VC4_HDMI_MAI_FORMAT_SAMPLE_RATE) |
     VC4_SET_FIELD(mai_audio_format,
     VC4_HDMI_MAI_FORMAT_AUDIO_FORMAT));

 /* The B frame identifier should match the value used by alsa-lib (8) */
 audio_packet_config =
  VC4_HDMI_AUDIO_PACKET_ZERO_DATA_ON_SAMPLE_FLAT |
  VC4_HDMI_AUDIO_PACKET_ZERO_DATA_ON_INACTIVE_CHANNELS |
  VC4_SET_FIELD(0x8, VC4_HDMI_AUDIO_PACKET_B_FRAME_IDENTIFIER);

 channel_mask = GENMASK(channels - 1, 0);
 audio_packet_config |= VC4_SET_FIELD(channel_mask,
          VC4_HDMI_AUDIO_PACKET_CEA_MASK);

 /* Set the MAI threshold */
 switch (vc4->gen) {
 case VC4_GEN_6_D:
  HDMI_WRITE(HDMI_MAI_THR,
      VC4_SET_FIELD(0x10, VC6_D_HD_MAI_THR_PANICHIGH) |
      VC4_SET_FIELD(0x10, VC6_D_HD_MAI_THR_PANICLOW) |
      VC4_SET_FIELD(0x1c, VC6_D_HD_MAI_THR_DREQHIGH) |
      VC4_SET_FIELD(0x1c, VC6_D_HD_MAI_THR_DREQLOW));
  break;
 case VC4_GEN_6_C:
 case VC4_GEN_5:
  HDMI_WRITE(HDMI_MAI_THR,
      VC4_SET_FIELD(0x10, VC4_HD_MAI_THR_PANICHIGH) |
      VC4_SET_FIELD(0x10, VC4_HD_MAI_THR_PANICLOW) |
      VC4_SET_FIELD(0x1c, VC4_HD_MAI_THR_DREQHIGH) |
      VC4_SET_FIELD(0x1c, VC4_HD_MAI_THR_DREQLOW));
  break;
 case VC4_GEN_4:
  HDMI_WRITE(HDMI_MAI_THR,
      VC4_SET_FIELD(0x8, VC4_HD_MAI_THR_PANICHIGH) |
      VC4_SET_FIELD(0x8, VC4_HD_MAI_THR_PANICLOW) |
      VC4_SET_FIELD(0x6, VC4_HD_MAI_THR_DREQHIGH) |
      VC4_SET_FIELD(0x8, VC4_HD_MAI_THR_DREQLOW));
  break;
 default:
  drm_err(drm, "Unknown VC4 generation: %d", vc4->gen);
  break;
 }

 HDMI_WRITE(HDMI_MAI_CONFIG,
     VC4_HDMI_MAI_CONFIG_BIT_REVERSE |
     VC4_HDMI_MAI_CONFIG_FORMAT_REVERSE |
     VC4_SET_FIELD(channel_mask, VC4_HDMI_MAI_CHANNEL_MASK));

 channel_map = vc4_hdmi->variant->channel_map(vc4_hdmi, channel_mask);
 HDMI_WRITE(HDMI_MAI_CHANNEL_MAP, channel_map);
 HDMI_WRITE(HDMI_AUDIO_PACKET_CONFIG, audio_packet_config);

 vc4_hdmi_set_n_cts(vc4_hdmi, sample_rate);

 spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);

 ret = drm_atomic_helper_connector_hdmi_update_audio_infoframe(connector,
              ¶ms->cea);
 if (ret)
  goto out_dev_exit;

out_dev_exit:
 drm_dev_exit(idx);
out:
 mutex_unlock(&vc4_hdmi->mutex);

 return ret;
}

static const struct snd_soc_component_driver vc4_hdmi_audio_cpu_dai_comp = {
 .name = "vc4-hdmi-cpu-dai-component",
 .legacy_dai_naming = 1,
};

static int vc4_hdmi_audio_cpu_dai_probe(struct snd_soc_dai *dai)
{
 struct vc4_hdmi *vc4_hdmi = dai_to_hdmi(dai);

 snd_soc_dai_init_dma_data(dai, &vc4_hdmi->audio.dma_data, NULL);

 return 0;
}

static const struct snd_soc_dai_ops vc4_snd_dai_ops = {
 .probe  = vc4_hdmi_audio_cpu_dai_probe,
};

static struct snd_soc_dai_driver vc4_hdmi_audio_cpu_dai_drv = {
 .name = "vc4-hdmi-cpu-dai",
 .ops = &vc4_snd_dai_ops,
 .playback = {
  .stream_name = "Playback",
  .channels_min = 1,
  .channels_max = 8,
  .rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
    SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
    SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
    SNDRV_PCM_RATE_192000,
  .formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE,
 },
};

static const struct snd_dmaengine_pcm_config pcm_conf = {
 .chan_names[SNDRV_PCM_STREAM_PLAYBACK] = "audio-rx",
 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
};

static const struct drm_connector_hdmi_audio_funcs vc4_hdmi_audio_funcs = {
 .startup = vc4_hdmi_audio_startup,
 .prepare = vc4_hdmi_audio_prepare,
 .shutdown = vc4_hdmi_audio_shutdown,
};

static int vc4_hdmi_codec_init(struct snd_soc_pcm_runtime *rtd)
{
 struct vc4_hdmi *vc4_hdmi = snd_soc_card_get_drvdata(rtd->card);
 struct snd_soc_component *component = snd_soc_rtd_to_codec(rtd, 0)->component;
 int ret;

 ret = snd_soc_card_jack_new(rtd->card, "HDMI Jack", SND_JACK_LINEOUT,
        &vc4_hdmi->hdmi_jack);
 if (ret) {
  dev_err(rtd->dev, "HDMI Jack creation failed: %d\n", ret);
  return ret;
 }

 return snd_soc_component_set_jack(component, &vc4_hdmi->hdmi_jack, NULL);
}

static int vc4_hdmi_audio_init(struct vc4_hdmi *vc4_hdmi)
{
 const struct vc4_hdmi_register *mai_data =
  &vc4_hdmi->variant->registers[HDMI_MAI_DATA];
 struct snd_soc_dai_link *dai_link = &vc4_hdmi->audio.link;
 struct snd_soc_card *card = &vc4_hdmi->audio.card;
 struct device *dev = &vc4_hdmi->pdev->dev;
 const __be32 *addr;
 int index, len;
 int ret;

 /*
 * ASoC makes it a bit hard to retrieve a pointer to the
 * vc4_hdmi structure. Registering the card will overwrite our
 * device drvdata with a pointer to the snd_soc_card structure,
 * which can then be used to retrieve whatever drvdata we want
 * to associate.
 *
 * However, that doesn't fly in the case where we wouldn't
 * register an ASoC card (because of an old DT that is missing
 * the dmas properties for example), then the card isn't
 * registered and the device drvdata wouldn't be set.
 *
 * We can deal with both cases by making sure a snd_soc_card
 * pointer and a vc4_hdmi structure are pointing to the same
 * memory address, so we can treat them indistinctly without any
 * issue.
 */
 BUILD_BUG_ON(offsetof(struct vc4_hdmi_audio, card) != 0);
 BUILD_BUG_ON(offsetof(struct vc4_hdmi, audio) != 0);

 if (!of_find_property(dev->of_node, "dmas", &len) || !len) {
  dev_warn(dev,
    "'dmas' DT property is missing or empty, no HDMI audio\n");
  return 0;
 }

 if (mai_data->reg != VC4_HD) {
  WARN_ONCE(true, "MAI isn't in the HD block\n");
  return -EINVAL;
 }

 /*
 * Get the physical address of VC4_HD_MAI_DATA. We need to retrieve
 * the bus address specified in the DT, because the physical address
 * (the one returned by platform_get_resource()) is not appropriate
 * for DMA transfers.
 * This VC/MMU should probably be exposed to avoid this kind of hacks.
 */
 index = of_property_match_string(dev->of_node, "reg-names", "hd");
 /* Before BCM2711, we don't have a named register range */
 if (index < 0)
  index = 1;

 addr = of_get_address(dev->of_node, index, NULL, NULL);
 if (!addr)
  return -EINVAL;

 vc4_hdmi->audio.dma_data.addr = be32_to_cpup(addr) + mai_data->offset;
 vc4_hdmi->audio.dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 vc4_hdmi->audio.dma_data.maxburst = 2;

 /*
 * NOTE: Strictly speaking, we should probably use a DRM-managed
 * registration there to avoid removing all the audio components
 * by the time the driver doesn't have any user anymore.
 *
 * However, the ASoC core uses a number of devm_kzalloc calls
 * when registering, even when using non-device-managed
 * functions (such as in snd_soc_register_component()).
 *
 * If we call snd_soc_unregister_component() in a DRM-managed
 * action, the device-managed actions have already been executed
 * and thus we would access memory that has been freed.
 *
 * Using device-managed hooks here probably leaves us open to a
 * bunch of issues if userspace still has a handle on the ALSA
 * device when the device is removed. However, this is mitigated
 * by the use of drm_dev_enter()/drm_dev_exit() in the audio
 * path to prevent the access to the device resources if it
 * isn't there anymore.
 *
 * Then, the vc4_hdmi structure is DRM-managed and thus only
 * freed whenever the last user has closed the DRM device file.
 * It should thus outlive ALSA in most situations.
 */
 ret = devm_snd_dmaengine_pcm_register(dev, &pcm_conf, 0);
--> --------------------

--> maximum size reached

--> --------------------