Quelle  meson_encoder_dsi.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2016 BayLibre, SAS
 * Author: Neil Armstrong <narmstrong@baylibre.com>
 * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_graph.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_bridge_connector.h>
#include <drm/drm_device.h>
#include <drm/drm_probe_helper.h>

#include "meson_drv.h"
#include "meson_encoder_dsi.h"
#include "meson_registers.h"
#include "meson_venc.h"
#include "meson_vclk.h"

struct meson_encoder_dsi {
 struct drm_encoder encoder;
 struct drm_bridge bridge;
 struct drm_bridge *next_bridge;
 struct meson_drm *priv;
};

#define bridge_to_meson_encoder_dsi(x) \
 container_of(x, struct meson_encoder_dsi, bridge)

static int meson_encoder_dsi_attach(struct drm_bridge *bridge,
        struct drm_encoder *encoder,
        enum drm_bridge_attach_flags flags)
{
 struct meson_encoder_dsi *encoder_dsi = bridge_to_meson_encoder_dsi(bridge);

 return drm_bridge_attach(encoder, encoder_dsi->next_bridge,
     &encoder_dsi->bridge, flags);
}

static void meson_encoder_dsi_atomic_enable(struct drm_bridge *bridge,
         struct drm_atomic_state *state)
{
 struct meson_encoder_dsi *encoder_dsi = bridge_to_meson_encoder_dsi(bridge);
 struct meson_drm *priv = encoder_dsi->priv;
 struct drm_connector_state *conn_state;
 struct drm_crtc_state *crtc_state;
 struct drm_connector *connector;

 connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
 if (WARN_ON(!connector))
  return;

 conn_state = drm_atomic_get_new_connector_state(state, connector);
 if (WARN_ON(!conn_state))
  return;

 crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
 if (WARN_ON(!crtc_state))
  return;

 /* ENCL clock setup is handled by CCF */

 meson_venc_mipi_dsi_mode_set(priv, &crtc_state->adjusted_mode);
 meson_encl_load_gamma(priv);

 writel_relaxed(0, priv->io_base + _REG(ENCL_VIDEO_EN));

 writel_bits_relaxed(ENCL_VIDEO_MODE_ADV_VFIFO_EN, ENCL_VIDEO_MODE_ADV_VFIFO_EN,
       priv->io_base + _REG(ENCL_VIDEO_MODE_ADV));
 writel_relaxed(0, priv->io_base + _REG(ENCL_TST_EN));

 writel_bits_relaxed(BIT(0), 0, priv->io_base + _REG(VPP_WRAP_OSD1_MATRIX_EN_CTRL));

 writel_relaxed(1, priv->io_base + _REG(ENCL_VIDEO_EN));
}

static void meson_encoder_dsi_atomic_disable(struct drm_bridge *bridge,
          struct drm_atomic_state *state)
{
 struct meson_encoder_dsi *meson_encoder_dsi =
     bridge_to_meson_encoder_dsi(bridge);
 struct meson_drm *priv = meson_encoder_dsi->priv;

 writel_relaxed(0, priv->io_base + _REG(ENCL_VIDEO_EN));

 writel_bits_relaxed(BIT(0), BIT(0), priv->io_base + _REG(VPP_WRAP_OSD1_MATRIX_EN_CTRL));
}

static const struct drm_bridge_funcs meson_encoder_dsi_bridge_funcs = {
 .attach = meson_encoder_dsi_attach,
 .atomic_enable = meson_encoder_dsi_atomic_enable,
 .atomic_disable = meson_encoder_dsi_atomic_disable,
 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 .atomic_reset = drm_atomic_helper_bridge_reset,
};

int meson_encoder_dsi_probe(struct meson_drm *priv)
{
 struct meson_encoder_dsi *meson_encoder_dsi;
 struct device_node *remote;
 int ret;

 meson_encoder_dsi = devm_drm_bridge_alloc(priv->dev,
        struct meson_encoder_dsi,
        bridge,
        &meson_encoder_dsi_bridge_funcs);
 if (IS_ERR(meson_encoder_dsi))
  return PTR_ERR(meson_encoder_dsi);

 /* DSI Transceiver Bridge */
 remote = of_graph_get_remote_node(priv->dev->of_node, 2, 0);
 if (!remote) {
  dev_err(priv->dev, "DSI transceiver device is disabled");
  return 0;
 }

 meson_encoder_dsi->next_bridge = of_drm_find_bridge(remote);
 if (!meson_encoder_dsi->next_bridge)
  return dev_err_probe(priv->dev, -EPROBE_DEFER,
         "Failed to find DSI transceiver bridge\n");

 /* DSI Encoder Bridge */
 meson_encoder_dsi->bridge.of_node = priv->dev->of_node;
 meson_encoder_dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;

 drm_bridge_add(&meson_encoder_dsi->bridge);

 meson_encoder_dsi->priv = priv;

 /* Encoder */
 ret = drm_simple_encoder_init(priv->drm, &meson_encoder_dsi->encoder,
          DRM_MODE_ENCODER_DSI);
 if (ret)
  return dev_err_probe(priv->dev, ret,
         "Failed to init DSI encoder\n");

 meson_encoder_dsi->encoder.possible_crtcs = BIT(0);

 /* Attach DSI Encoder Bridge to Encoder */
 ret = drm_bridge_attach(&meson_encoder_dsi->encoder, &meson_encoder_dsi->bridge, NULL, 0);
 if (ret)
  return dev_err_probe(priv->dev, ret,
         "Failed to attach bridge\n");

 /*
 * We should have now in place:
 * encoder->[dsi encoder bridge]->[dw-mipi-dsi bridge]->[panel bridge]->[panel]
 */

 priv->encoders[MESON_ENC_DSI] = meson_encoder_dsi;

 dev_dbg(priv->dev, "DSI encoder initialized\n");

 return 0;
}

void meson_encoder_dsi_remove(struct meson_drm *priv)
{
 struct meson_encoder_dsi *meson_encoder_dsi;

 if (priv->encoders[MESON_ENC_DSI]) {
  meson_encoder_dsi = priv->encoders[MESON_ENC_DSI];
  drm_bridge_remove(&meson_encoder_dsi->bridge);
 }
}