Quelle  malidp_mw.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * (C) COPYRIGHT 2016 ARM Limited. All rights reserved.
 * Author: Brian Starkey <brian.starkey@arm.com>
 *
 * ARM Mali DP Writeback connector implementation
 */

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include <drm/drm_fb_dma_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_writeback.h>

#include "malidp_drv.h"
#include "malidp_hw.h"
#include "malidp_mw.h"

#define to_mw_state(_state) (struct malidp_mw_connector_state *)(_state)

struct malidp_mw_connector_state {
 struct drm_connector_state base;
 dma_addr_t addrs[2];
 s32 pitches[2];
 u8 format;
 u8 n_planes;
 bool rgb2yuv_initialized;
 const s16 *rgb2yuv_coeffs;
};

static int malidp_mw_connector_get_modes(struct drm_connector *connector)
{
 struct drm_device *dev = connector->dev;

 return drm_add_modes_noedid(connector, dev->mode_config.max_width,
        dev->mode_config.max_height);
}

static enum drm_mode_status
malidp_mw_connector_mode_valid(struct drm_connector *connector,
          const struct drm_display_mode *mode)
{
 struct drm_device *dev = connector->dev;
 struct drm_mode_config *mode_config = &dev->mode_config;
 int w = mode->hdisplay, h = mode->vdisplay;

 if ((w < mode_config->min_width) || (w > mode_config->max_width))
  return MODE_BAD_HVALUE;

 if ((h < mode_config->min_height) || (h > mode_config->max_height))
  return MODE_BAD_VVALUE;

 return MODE_OK;
}

static const struct drm_connector_helper_funcs malidp_mw_connector_helper_funcs = {
 .get_modes = malidp_mw_connector_get_modes,
 .mode_valid = malidp_mw_connector_mode_valid,
};

static void malidp_mw_connector_reset(struct drm_connector *connector)
{
 struct malidp_mw_connector_state *mw_state =
  kzalloc(sizeof(*mw_state), GFP_KERNEL);

 if (connector->state)
  __drm_atomic_helper_connector_destroy_state(connector->state);

 kfree(connector->state);
 connector->state = NULL;

 if (mw_state)
  __drm_atomic_helper_connector_reset(connector, &mw_state->base);
}

static enum drm_connector_status
malidp_mw_connector_detect(struct drm_connector *connector, bool force)
{
 return connector_status_connected;
}

static void malidp_mw_connector_destroy(struct drm_connector *connector)
{
 drm_connector_cleanup(connector);
}

static struct drm_connector_state *
malidp_mw_connector_duplicate_state(struct drm_connector *connector)
{
 struct malidp_mw_connector_state *mw_state, *mw_current_state;

 if (WARN_ON(!connector->state))
  return NULL;

 mw_state = kzalloc(sizeof(*mw_state), GFP_KERNEL);
 if (!mw_state)
  return NULL;

 mw_current_state = to_mw_state(connector->state);
 mw_state->rgb2yuv_coeffs = mw_current_state->rgb2yuv_coeffs;
 mw_state->rgb2yuv_initialized = mw_current_state->rgb2yuv_initialized;

 __drm_atomic_helper_connector_duplicate_state(connector, &mw_state->base);

 return &mw_state->base;
}

static const struct drm_connector_funcs malidp_mw_connector_funcs = {
 .reset = malidp_mw_connector_reset,
 .detect = malidp_mw_connector_detect,
 .fill_modes = drm_helper_probe_single_connector_modes,
 .destroy = malidp_mw_connector_destroy,
 .atomic_duplicate_state = malidp_mw_connector_duplicate_state,
 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static const s16 rgb2yuv_coeffs_bt709_limited[MALIDP_COLORADJ_NUM_COEFFS] = {
 47,  157,   16,
 -26,  -87,  112,
 112, -102,  -10,
 16,  128,  128
};

static int
malidp_mw_encoder_atomic_check(struct drm_encoder *encoder,
          struct drm_crtc_state *crtc_state,
          struct drm_connector_state *conn_state)
{
 struct malidp_mw_connector_state *mw_state = to_mw_state(conn_state);
 struct malidp_drm *malidp = drm_to_malidp(encoder->dev);
 struct drm_framebuffer *fb;
 int i, n_planes;

 if (!conn_state->writeback_job)
  return 0;

 fb = conn_state->writeback_job->fb;
 if ((fb->width != crtc_state->mode.hdisplay) ||
     (fb->height != crtc_state->mode.vdisplay)) {
  DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
    fb->width, fb->height);
  return -EINVAL;
 }

 if (fb->modifier) {
  DRM_DEBUG_KMS("Writeback framebuffer does not support modifiers\n");
  return -EINVAL;
 }

 mw_state->format =
  malidp_hw_get_format_id(&malidp->dev->hw->map, SE_MEMWRITE,
     fb->format->format, !!fb->modifier);
 if (mw_state->format == MALIDP_INVALID_FORMAT_ID) {
  DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
         &fb->format->format);
  return -EINVAL;
 }

 n_planes = fb->format->num_planes;
 for (i = 0; i < n_planes; i++) {
  struct drm_gem_dma_object *obj = drm_fb_dma_get_gem_obj(fb, i);
  /* memory write buffers are never rotated */
  u8 alignment = malidp_hw_get_pitch_align(malidp->dev, 0);

  if (fb->pitches[i] & (alignment - 1)) {
   DRM_DEBUG_KMS("Invalid pitch %u for plane %d\n",
          fb->pitches[i], i);
   return -EINVAL;
  }
  mw_state->pitches[i] = fb->pitches[i];
  mw_state->addrs[i] = obj->dma_addr + fb->offsets[i];
 }
 mw_state->n_planes = n_planes;

 if (fb->format->is_yuv)
  mw_state->rgb2yuv_coeffs = rgb2yuv_coeffs_bt709_limited;

 return 0;
}

static const struct drm_encoder_helper_funcs malidp_mw_encoder_helper_funcs = {
 .atomic_check = malidp_mw_encoder_atomic_check,
};

static u32 *get_writeback_formats(struct malidp_drm *malidp, int *n_formats)
{
 const struct malidp_hw_regmap *map = &malidp->dev->hw->map;
 u32 *formats;
 int n, i;

 formats = kcalloc(map->n_pixel_formats, sizeof(*formats),
     GFP_KERNEL);
 if (!formats)
  return NULL;

 for (n = 0, i = 0;  i < map->n_pixel_formats; i++) {
  if (map->pixel_formats[i].layer & SE_MEMWRITE)
   formats[n++] = map->pixel_formats[i].format;
 }

 *n_formats = n;

 return formats;
}

int malidp_mw_connector_init(struct drm_device *drm)
{
 struct malidp_drm *malidp = drm_to_malidp(drm);
 u32 *formats;
 int ret, n_formats;

 if (!malidp->dev->hw->enable_memwrite)
  return 0;

 drm_connector_helper_add(&malidp->mw_connector.base,
     &malidp_mw_connector_helper_funcs);

 formats = get_writeback_formats(malidp, &n_formats);
 if (!formats)
  return -ENOMEM;

 ret = drm_writeback_connector_init(drm, &malidp->mw_connector,
        &malidp_mw_connector_funcs,
        &malidp_mw_encoder_helper_funcs,
        formats, n_formats,
        1 << drm_crtc_index(&malidp->crtc));
 kfree(formats);
 if (ret)
  return ret;

 return 0;
}

void malidp_mw_atomic_commit(struct drm_device *drm,
        struct drm_atomic_state *old_state)
{
 struct malidp_drm *malidp = drm_to_malidp(drm);
 struct drm_writeback_connector *mw_conn = &malidp->mw_connector;
 struct drm_connector_state *conn_state = mw_conn->base.state;
 struct malidp_hw_device *hwdev = malidp->dev;
 struct malidp_mw_connector_state *mw_state;

 if (!conn_state)
  return;

 mw_state = to_mw_state(conn_state);

 if (conn_state->writeback_job) {
  struct drm_framebuffer *fb = conn_state->writeback_job->fb;

  DRM_DEV_DEBUG_DRIVER(drm->dev,
         "Enable memwrite %ux%u:%d %pad fmt: %u\n",
         fb->width, fb->height,
         mw_state->pitches[0],
         &mw_state->addrs[0],
         mw_state->format);

  drm_writeback_queue_job(mw_conn, conn_state);
  hwdev->hw->enable_memwrite(hwdev, mw_state->addrs,
        mw_state->pitches, mw_state->n_planes,
        fb->width, fb->height, mw_state->format,
        !mw_state->rgb2yuv_initialized ?
        mw_state->rgb2yuv_coeffs : NULL);
  mw_state->rgb2yuv_initialized = !!mw_state->rgb2yuv_coeffs;
 } else {
  DRM_DEV_DEBUG_DRIVER(drm->dev, "Disable memwrite\n");
  hwdev->hw->disable_memwrite(hwdev);
 }
}