[PATCH v2 6/7] drm/mediatek: mtk_dsi: Use the drm_panel_bridge API
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Thu Apr 16 17:33:26 UTC 2020
Hi Enric,
Thank you for the patch.
On Thu, Apr 16, 2020 at 05:57:18PM +0200, Enric Balletbo i Serra wrote:
> Replace the manual panel handling code by a drm_panel_bridge. This
> simplifies the driver and allows all components in the display pipeline
> to be treated as bridges, paving the way to generic connector handling.
>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo at collabora.com>
> ---
>
> Changes in v2:
> - Do not set connector_type for panel here. (Sam Ravnborg)
>
> drivers/gpu/drm/mediatek/mtk_dsi.c | 177 ++++-------------------------
> 1 file changed, 19 insertions(+), 158 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 48361c1e9f34..44718fa3d1ca 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -182,8 +182,7 @@ struct mtk_dsi {
> struct mipi_dsi_host host;
> struct drm_encoder encoder;
> struct drm_bridge bridge;
> - struct drm_connector conn;
> - struct drm_panel *panel;
> + struct drm_bridge *panel_bridge;
I think you can use the next_bridge field to store the panel bridge, it
will simplify the code a bit in mtk_dsi_bridge_attach().
> struct drm_bridge *next_bridge;
> struct phy *phy;
>
> @@ -212,11 +211,6 @@ static inline struct mtk_dsi *bridge_to_dsi(struct drm_bridge *b)
> return container_of(b, struct mtk_dsi, bridge);
> }
>
> -static inline struct mtk_dsi *connector_to_dsi(struct drm_connector *c)
> -{
> - return container_of(c, struct mtk_dsi, conn);
> -}
> -
> static inline struct mtk_dsi *host_to_dsi(struct mipi_dsi_host *h)
> {
> return container_of(h, struct mtk_dsi, host);
> @@ -682,16 +676,7 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
> mtk_dsi_lane0_ulp_mode_leave(dsi);
> mtk_dsi_clk_hs_mode(dsi, 0);
>
> - if (dsi->panel) {
> - if (drm_panel_prepare(dsi->panel)) {
> - DRM_ERROR("failed to prepare the panel\n");
> - goto err_disable_digital_clk;
> - }
> - }
> -
> return 0;
> -err_disable_digital_clk:
> - clk_disable_unprepare(dsi->digital_clk);
> err_disable_engine_clk:
> clk_disable_unprepare(dsi->engine_clk);
> err_phy_power_off:
> @@ -718,15 +703,7 @@ static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
> */
> mtk_dsi_stop(dsi);
>
> - if (!mtk_dsi_switch_to_cmd_mode(dsi, VM_DONE_INT_FLAG, 500)) {
> - if (dsi->panel) {
> - if (drm_panel_unprepare(dsi->panel)) {
> - DRM_ERROR("failed to unprepare the panel\n");
> - return;
> - }
> - }
> - }
> -
> + mtk_dsi_switch_to_cmd_mode(dsi, VM_DONE_INT_FLAG, 500);
> mtk_dsi_reset_engine(dsi);
> mtk_dsi_lane0_ulp_mode_enter(dsi);
> mtk_dsi_clk_ulp_mode_enter(dsi);
> @@ -757,19 +734,7 @@ static void mtk_output_dsi_enable(struct mtk_dsi *dsi)
>
> mtk_dsi_start(dsi);
>
> - if (dsi->panel) {
> - if (drm_panel_enable(dsi->panel)) {
> - DRM_ERROR("failed to enable the panel\n");
> - goto err_dsi_power_off;
> - }
> - }
> -
> dsi->enabled = true;
> -
> - return;
> -err_dsi_power_off:
> - mtk_dsi_stop(dsi);
> - mtk_dsi_poweroff(dsi);
> }
>
> static void mtk_output_dsi_disable(struct mtk_dsi *dsi)
> @@ -777,34 +742,24 @@ static void mtk_output_dsi_disable(struct mtk_dsi *dsi)
> if (!dsi->enabled)
> return;
>
> - if (dsi->panel) {
> - if (drm_panel_disable(dsi->panel)) {
> - DRM_ERROR("failed to disable the panel\n");
> - return;
> - }
> - }
> -
> mtk_dsi_poweroff(dsi);
>
> dsi->enabled = false;
> }
>
> -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)
> {
> struct mtk_dsi *dsi = bridge_to_dsi(bridge);
> + struct drm_bridge *next;
>
> - 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);
> + if (dsi->next_bridge)
> + next = dsi->next_bridge;
> + else
> + next = dsi->panel_bridge;
>
> - mtk_dsi_destroy_conn_enc(dsi);
> + /* Attach the panel or bridge to the dsi bridge */
> + return drm_bridge_attach(bridge->encoder, next, &dsi->bridge, flags);
> }
>
> static void mtk_dsi_bridge_mode_set(struct drm_bridge *bridge,
> @@ -830,101 +785,13 @@ static void mtk_dsi_bridge_enable(struct drm_bridge *bridge)
> mtk_output_dsi_enable(dsi);
> }
>
> -static int mtk_dsi_connector_get_modes(struct drm_connector *connector)
> -{
> - struct mtk_dsi *dsi = connector_to_dsi(connector);
> -
> - return drm_panel_get_modes(dsi->panel, connector);
> -}
> -
> 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 = {
> - .fill_modes = drm_helper_probe_single_connector_modes,
> - .destroy = drm_connector_cleanup,
> - .reset = drm_atomic_helper_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
> - mtk_dsi_connector_helper_funcs = {
> - .get_modes = mtk_dsi_connector_get_modes,
> -};
> -
> -static int mtk_dsi_create_connector(struct drm_device *drm, struct mtk_dsi *dsi)
> -{
> - int ret;
> -
> - ret = drm_connector_init(drm, &dsi->conn, &mtk_dsi_connector_funcs,
> - DRM_MODE_CONNECTOR_DSI);
> - if (ret) {
> - DRM_ERROR("Failed to connector init to drm\n");
> - return ret;
> - }
> -
> - drm_connector_helper_add(&dsi->conn, &mtk_dsi_connector_helper_funcs);
> -
> - dsi->conn.dpms = DRM_MODE_DPMS_OFF;
> - drm_connector_attach_encoder(&dsi->conn, &dsi->encoder);
> -
> - if (dsi->panel) {
> - ret = drm_panel_attach(dsi->panel, &dsi->conn);
> - if (ret) {
> - DRM_ERROR("Failed to attach panel to drm\n");
> - goto err_connector_cleanup;
> - }
> - }
> -
> - return 0;
> -
> -err_connector_cleanup:
> - drm_connector_cleanup(&dsi->conn);
> - return ret;
> -}
> -
> -static int mtk_dsi_create_conn_enc(struct drm_device *drm, struct mtk_dsi *dsi)
> -{
> - int ret;
> -
> - /* If there's a bridge, attach to it and let it create the connector */
> - if (dsi->next_bridge) {
> - ret = drm_bridge_attach(&dsi->encoder, dsi->next_bridge, NULL,
> - 0);
> - if (ret) {
> - DRM_ERROR("Failed to attach bridge to drm\n");
> - goto err_encoder_cleanup;
> - }
> - } else {
> - /* Otherwise create our own connector and attach to a panel */
> - ret = mtk_dsi_create_connector(drm, dsi);
> - if (ret)
> - goto err_encoder_cleanup;
> - }
> -
> - return 0;
> -
> -err_encoder_cleanup:
> - drm_encoder_cleanup(&dsi->encoder);
> - return ret;
> -}
> -
> -static void mtk_dsi_destroy_conn_enc(struct mtk_dsi *dsi)
> -{
> - drm_encoder_cleanup(&dsi->encoder);
> - /* Skip connector cleanup if creation was delegated to the bridge */
> - if (dsi->conn.dev)
> - drm_connector_cleanup(&dsi->conn);
> - if (dsi->panel)
> - drm_panel_detach(dsi->panel);
> -}
> -
> static void mtk_dsi_ddp_start(struct mtk_ddp_comp *comp)
> {
> struct mtk_dsi *dsi = container_of(comp, struct mtk_dsi, ddp_comp);
> @@ -953,20 +820,6 @@ static int mtk_dsi_host_attach(struct mipi_dsi_host *host,
> dsi->format = device->format;
> dsi->mode_flags = device->mode_flags;
>
> - if (dsi->conn.dev)
> - drm_helper_hpd_irq_event(dsi->conn.dev);
> -
> - return 0;
> -}
> -
> -static int mtk_dsi_host_detach(struct mipi_dsi_host *host,
> - struct mipi_dsi_device *device)
> -{
> - struct mtk_dsi *dsi = host_to_dsi(host);
> -
> - if (dsi->conn.dev)
> - drm_helper_hpd_irq_event(dsi->conn.dev);
> -
> return 0;
> }
>
> @@ -1110,7 +963,6 @@ static ssize_t mtk_dsi_host_transfer(struct mipi_dsi_host *host,
>
> static const struct mipi_dsi_host_ops mtk_dsi_ops = {
> .attach = mtk_dsi_host_attach,
> - .detach = mtk_dsi_host_detach,
> .transfer = mtk_dsi_host_transfer,
> };
>
> @@ -1184,6 +1036,7 @@ static int mtk_dsi_probe(struct platform_device *pdev)
> {
> struct mtk_dsi *dsi;
> struct device *dev = &pdev->dev;
> + struct drm_panel *panel;
> struct resource *regs;
> int irq_num;
> int comp_id;
> @@ -1202,10 +1055,18 @@ static int mtk_dsi_probe(struct platform_device *pdev)
> }
>
> ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
> - &dsi->panel, &dsi->next_bridge);
> + &panel, &dsi->next_bridge);
> if (ret)
> goto err_unregister_host;
>
> + if (panel) {
> + dsi->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
devm_drm_panel_bridge_add() can also return NULL on errors, so you need
IS_ERR_OR_NULL() below (and a special case to give ret a negative value
when the result is NULL). Or maybe it would be best to fix
devm_drm_panel_bridge_add() to always return an error pointer.
With this fixed,
Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> + if (IS_ERR(dsi->panel_bridge)) {
> + ret = PTR_ERR(dsi->panel_bridge);
> + goto err_unregister_host;
> + }
> + }
> +
> dsi->driver_data = of_device_get_match_data(dev);
>
> dsi->engine_clk = devm_clk_get(dev, "engine");
--
Regards,
Laurent Pinchart
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