Re: [PATCH v4 4/7] drm/mediatek: mtk_dsi: Convert to bridge driver

Hi, Enric:

Enric Balletbo i Serra enric.balletbo@collabora.com 於 2020年5月1日 週五 下午11:23寫道：

Convert mtk_dsi to a bridge driver with built-in encoder support for compatibility with existing component drivers.

Reviewed-by: Chun-Kuang Hu chunkuang.hu@kernel.org

Signed-off-by: Enric Balletbo i Serra enric.balletbo@collabora.com Acked-by: Sam Ravnborg sam@ravnborg.org

---

Changes in v4:

• Remove double call to drm_encoder_init(). (Chun-Kuang Hu)
• Cleanup the encoder in mtk_dsi_unbind(). (Chun-Kuang Hu)

Changes in v3:

• Add the bridge.type. (Laurent Pinchart)

Changes in v2: None

drivers/gpu/drm/mediatek/mtk_dsi.c | 108 +++++++++++++++++++---------- 1 file changed, 70 insertions(+), 38 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c index 37b8d7ffd835..38cbdcb15fff 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c @@ -180,6 +180,7 @@ struct mtk_dsi { struct device *dev; struct mipi_dsi_host host; struct drm_encoder encoder;

•   struct drm_bridge bridge;
    struct drm_connector conn;
    struct drm_panel *panel;
    struct drm_bridge *next_bridge;
  

@@ -205,9 +206,9 @@ struct mtk_dsi { const struct mtk_dsi_driver_data *driver_data; };

-static inline struct mtk_dsi *encoder_to_dsi(struct drm_encoder *e) +static inline struct mtk_dsi *bridge_to_dsi(struct drm_bridge *b) {

•   return container_of(e, struct mtk_dsi, encoder);
  

•   return container_of(b, struct mtk_dsi, bridge);
  

}

static inline struct mtk_dsi *connector_to_dsi(struct drm_connector *c) @@ -796,32 +797,43 @@ static const struct drm_encoder_funcs mtk_dsi_encoder_funcs = { .destroy = mtk_dsi_encoder_destroy, };

-static bool mtk_dsi_encoder_mode_fixup(struct drm_encoder *encoder,

•                                  const struct drm_display_mode *mode,
  

•                                  struct drm_display_mode *adjusted_mode)
  

+static int mtk_dsi_create_conn_enc(struct drm_device *drm, struct mtk_dsi *dsi); +static void mtk_dsi_destroy_conn_enc(struct mtk_dsi *dsi);

+static int mtk_dsi_bridge_attach(struct drm_bridge *bridge,

•                            enum drm_bridge_attach_flags flags)
  

{

•   return true;
  

•   struct mtk_dsi *dsi = bridge_to_dsi(bridge);
  

•   return mtk_dsi_create_conn_enc(bridge->dev, dsi);
  

+}

+static void mtk_dsi_bridge_detach(struct drm_bridge *bridge) +{

•   struct mtk_dsi *dsi = bridge_to_dsi(bridge);
  

•   mtk_dsi_destroy_conn_enc(dsi);
  

}

-static void mtk_dsi_encoder_mode_set(struct drm_encoder *encoder,

•                                struct drm_display_mode *mode,
  

•                                struct drm_display_mode *adjusted)
  

+static void mtk_dsi_bridge_mode_set(struct drm_bridge *bridge,

•                               const struct drm_display_mode *mode,
  

•                               const struct drm_display_mode *adjusted)
  

{

•   struct mtk_dsi *dsi = encoder_to_dsi(encoder);
  

•   struct mtk_dsi *dsi = bridge_to_dsi(bridge);
  
    drm_display_mode_to_videomode(adjusted, &dsi->vm);
  

}

-static void mtk_dsi_encoder_disable(struct drm_encoder *encoder) +static void mtk_dsi_bridge_disable(struct drm_bridge *bridge) {

•   struct mtk_dsi *dsi = encoder_to_dsi(encoder);
  

•   struct mtk_dsi *dsi = bridge_to_dsi(bridge);
  
    mtk_output_dsi_disable(dsi);
  

}

-static void mtk_dsi_encoder_enable(struct drm_encoder *encoder) +static void mtk_dsi_bridge_enable(struct drm_bridge *bridge) {

•   struct mtk_dsi *dsi = encoder_to_dsi(encoder);
  

•   struct mtk_dsi *dsi = bridge_to_dsi(bridge);
  
    mtk_output_dsi_enable(dsi);
  

} @@ -833,11 +845,12 @@ static int mtk_dsi_connector_get_modes(struct drm_connector *connector) return drm_panel_get_modes(dsi->panel, connector); }

-static const struct drm_encoder_helper_funcs mtk_dsi_encoder_helper_funcs = {

•   .mode_fixup = mtk_dsi_encoder_mode_fixup,
  

•   .mode_set = mtk_dsi_encoder_mode_set,
  

•   .disable = mtk_dsi_encoder_disable,
  

•   .enable = mtk_dsi_encoder_enable,
  

+static const struct drm_bridge_funcs mtk_dsi_bridge_funcs = {

•   .attach = mtk_dsi_bridge_attach,
  

•   .detach = mtk_dsi_bridge_detach,
  

•   .disable = mtk_dsi_bridge_disable,
  

•   .enable = mtk_dsi_bridge_enable,
  

•   .mode_set = mtk_dsi_bridge_mode_set,
  

};

static const struct drm_connector_funcs mtk_dsi_connector_funcs = { @@ -888,20 +901,6 @@ static int mtk_dsi_create_conn_enc(struct drm_device *drm, struct mtk_dsi *dsi) { int ret;

•   ret = drm_encoder_init(drm, &dsi->encoder, &mtk_dsi_encoder_funcs,
  

•                          DRM_MODE_ENCODER_DSI, NULL);
  

•   if (ret) {
  

•           DRM_ERROR("Failed to encoder init to drm\n");
  

•           return ret;
  

•   }
  

•   drm_encoder_helper_add(&dsi->encoder, &mtk_dsi_encoder_helper_funcs);
  

•   /*
  

•    * Currently display data paths are statically assigned to a crtc each.
  

•    * crtc 0 is OVL0 -> COLOR0 -> AAL -> OD -> RDMA0 -> UFOE -> DSI0
  

•    */
  

•   dsi->encoder.possible_crtcs = 1;
  

•   /* If there's a next bridge, attach to it and let it create the connector */
    if (dsi->next_bridge) {
            ret = drm_bridge_attach(&dsi->encoder, dsi->next_bridge, NULL,
  

@@ -1123,6 +1122,34 @@ static const struct mipi_dsi_host_ops mtk_dsi_ops = { .transfer = mtk_dsi_host_transfer, };

+static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi) +{

•   int ret;
  

•   ret = drm_encoder_init(drm, &dsi->encoder, &mtk_dsi_encoder_funcs,
  

•                          DRM_MODE_ENCODER_DSI, NULL);
  

•   if (ret) {
  

•           DRM_ERROR("Failed to encoder init to drm\n");
  

•           return ret;
  

•   }
  

•   /*
  

•    * Currently display data paths are statically assigned to a crtc each.
  

•    * crtc 0 is OVL0 -> COLOR0 -> AAL -> OD -> RDMA0 -> UFOE -> DSI0
  

•    */
  

•   dsi->encoder.possible_crtcs = 1;
  

•   ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL, 0);
  

•   if (ret)
  

•           goto err_cleanup_encoder;
  

•   return 0;
  

+err_cleanup_encoder:

•   drm_encoder_cleanup(&dsi->encoder);
  

•   return ret;
  

+}

static int mtk_dsi_bind(struct device *dev, struct device *master, void *data) { int ret; @@ -1136,11 +1163,9 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data) return ret; }

•   ret = mtk_dsi_create_conn_enc(drm, dsi);
  

•   if (ret) {
  

•           DRM_ERROR("Encoder create failed with %d\n", ret);
  

•   ret = mtk_dsi_encoder_init(drm, dsi);
  

•   if (ret)
            goto err_unregister;
  

•   }
  
    return 0;
  
  

@@ -1155,7 +1180,7 @@ static void mtk_dsi_unbind(struct device *dev, struct device *master, struct drm_device *drm = data; struct mtk_dsi *dsi = dev_get_drvdata(dev);

•   mtk_dsi_destroy_conn_enc(dsi);
  

•   drm_encoder_cleanup(&dsi->encoder);
    mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
  

}

@@ -1265,6 +1290,12 @@ static int mtk_dsi_probe(struct platform_device *pdev)

    platform_set_drvdata(pdev, dsi);

•   dsi->bridge.funcs = &mtk_dsi_bridge_funcs;
  

•   dsi->bridge.of_node = dev->of_node;
  

•   dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
  

•   drm_bridge_add(&dsi->bridge);
  

•   ret = component_add(&pdev->dev, &mtk_dsi_component_ops);
    if (ret) {
            dev_err(&pdev->dev, "failed to add component: %d\n", ret);
  

@@ -1283,6 +1314,7 @@ static int mtk_dsi_remove(struct platform_device *pdev) struct mtk_dsi *dsi = platform_get_drvdata(pdev);

    mtk_output_dsi_disable(dsi);

•   drm_bridge_remove(&dsi->bridge);
    component_del(&pdev->dev, &mtk_dsi_component_ops);
    mipi_dsi_host_unregister(&dsi->host);
  
  

-- 2.26.2