drm/msm/dp: replace dp_connector with drm_bridge_connector

There is little point in having both connector and root bridge
implementation in the same driver. Move connector's functionality to the
bridge to let next bridge in chain to override it.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Tested-by: Sankeerth Billakanti <quic_sbillaka@quicinc.com>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/473854/
Link: https://lore.kernel.org/r/20220211224006.1797846-5-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/dp/dp_display.c

@@ -1547,17 +1547,6 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
 
 	dp_display->encoder = encoder;
 
-	dp_display->connector = dp_drm_connector_init(dp_display);
-	if (IS_ERR(dp_display->connector)) {
-		ret = PTR_ERR(dp_display->connector);
-		DRM_DEV_ERROR(dev->dev,
-			"failed to create dp connector: %d\n", ret);
-		dp_display->connector = NULL;
-		return ret;
-	}
-
-	dp_priv->panel->connector = dp_display->connector;
-
 	dp_display->bridge = msm_dp_bridge_init(dp_display, dev, encoder);
 	if (IS_ERR(dp_display->bridge)) {
 		ret = PTR_ERR(dp_display->bridge);
@@ -1569,6 +1558,17 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
 
 	priv->bridges[priv->num_bridges++] = dp_display->bridge;
 
+	dp_display->connector = dp_drm_connector_init(dp_display);
+	if (IS_ERR(dp_display->connector)) {
+		ret = PTR_ERR(dp_display->connector);
+		DRM_DEV_ERROR(dev->dev,
+			"failed to create dp connector: %d\n", ret);
+		dp_display->connector = NULL;
+		return ret;
+	}
+
+	dp_priv->panel->connector = dp_display->connector;
+
 	return 0;
 }
 

drivers/gpu/drm/msm/dp/dp_drm.c

@@ -6,6 +6,7 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_atomic.h>
 #include <drm/drm_bridge.h>
+#include <drm/drm_bridge_connector.h>
 #include <drm/drm_crtc.h>
 
 #include "msm_drv.h"
@@ -20,24 +21,16 @@ struct msm_dp_bridge {
 
 #define to_dp_display(x)     container_of((x), struct msm_dp_bridge, bridge)
 
-struct dp_connector {
-	struct drm_connector base;
-	struct msm_dp *dp_display;
-};
-#define to_dp_connector(x) container_of(x, struct dp_connector, base)
-
 /**
- * dp_connector_detect - callback to determine if connector is connected
- * @conn: Pointer to drm connector structure
- * @force: Force detect setting from drm framework
- * Returns: Connector 'is connected' status
+ * dp_bridge_detect - callback to determine if connector is connected
+ * @bridge: Pointer to drm bridge structure
+ * Returns: Bridge's 'is connected' status
  */
-static enum drm_connector_status dp_connector_detect(struct drm_connector *conn,
-		bool force)
+static enum drm_connector_status dp_bridge_detect(struct drm_bridge *bridge)
 {
 	struct msm_dp *dp;
 
-	dp = to_dp_connector(conn)->dp_display;
+	dp = to_dp_display(bridge)->dp_display;
 
 	DRM_DEBUG_DP("is_connected = %s\n",
 		(dp->is_connected) ? "true" : "false");
@@ -47,11 +40,12 @@ static enum drm_connector_status dp_connector_detect(struct drm_connector *conn,
 }
 
 /**
- * dp_connector_get_modes - callback to add drm modes via drm_mode_probed_add()
+ * dp_bridge_get_modes - callback to add drm modes via drm_mode_probed_add()
+ * @bridge: Poiner to drm bridge
  * @connector: Pointer to drm connector structure
  * Returns: Number of modes added
  */
-static int dp_connector_get_modes(struct drm_connector *connector)
+static int dp_bridge_get_modes(struct drm_bridge *bridge, struct drm_connector *connector)
 {
 	int rc = 0;
 	struct msm_dp *dp;
@@ -61,7 +55,7 @@ static int dp_connector_get_modes(struct drm_connector *connector)
 	if (!connector)
 		return 0;
 
-	dp = to_dp_connector(connector)->dp_display;
+	dp = to_dp_display(bridge)->dp_display;
 
 	dp_mode = kzalloc(sizeof(*dp_mode),  GFP_KERNEL);
 	if (!dp_mode)
@@ -102,18 +96,20 @@ static int dp_connector_get_modes(struct drm_connector *connector)
 }
 
 /**
- * dp_connector_mode_valid - callback to determine if specified mode is valid
- * @connector: Pointer to drm connector structure
+ * dp_bridge_mode_valid - callback to determine if specified mode is valid
+ * @bridge: Pointer to drm bridge structure
+ * @info: display info
  * @mode: Pointer to drm mode structure
  * Returns: Validity status for specified mode
  */
-static enum drm_mode_status dp_connector_mode_valid(
-		struct drm_connector *connector,
-		struct drm_display_mode *mode)
+static enum drm_mode_status dp_bridge_mode_valid(
+		struct drm_bridge *bridge,
+		const struct drm_display_info *info,
+		const struct drm_display_mode *mode)
 {
 	struct msm_dp *dp_disp;
 
-	dp_disp = to_dp_connector(connector)->dp_display;
+	dp_disp = to_dp_display(bridge)->dp_display;
 
 	if ((dp_disp->max_pclk_khz <= 0) ||
 			(dp_disp->max_pclk_khz > DP_MAX_PIXEL_CLK_KHZ) ||
@@ -123,55 +119,6 @@ static enum drm_mode_status dp_connector_mode_valid(
 	return dp_display_validate_mode(dp_disp, mode->clock);
 }
 
-static const struct drm_connector_funcs dp_connector_funcs = {
-	.detect = dp_connector_detect,
-	.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 dp_connector_helper_funcs = {
-	.get_modes = dp_connector_get_modes,
-	.mode_valid = dp_connector_mode_valid,
-};
-
-/* connector initialization */
-struct drm_connector *dp_drm_connector_init(struct msm_dp *dp_display)
-{
-	struct drm_connector *connector = NULL;
-	struct dp_connector *dp_connector;
-	int ret;
-
-	dp_connector = devm_kzalloc(dp_display->drm_dev->dev,
-					sizeof(*dp_connector),
-					GFP_KERNEL);
-	if (!dp_connector)
-		return ERR_PTR(-ENOMEM);
-
-	dp_connector->dp_display = dp_display;
-
-	connector = &dp_connector->base;
-
-	ret = drm_connector_init(dp_display->drm_dev, connector,
-			&dp_connector_funcs,
-			dp_display->connector_type);
-	if (ret)
-		return ERR_PTR(ret);
-
-	drm_connector_helper_add(connector, &dp_connector_helper_funcs);
-
-	/*
-	 * Enable HPD to let hpd event is handled when cable is connected.
-	 */
-	connector->polled = DRM_CONNECTOR_POLL_HPD;
-
-	drm_connector_attach_encoder(connector, dp_display->encoder);
-
-	return connector;
-}
-
 static void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
 				const struct drm_display_mode *mode,
 				const struct drm_display_mode *adjusted_mode)
@@ -211,6 +158,9 @@ static const struct drm_bridge_funcs dp_bridge_ops = {
 	.disable      = dp_bridge_disable,
 	.post_disable = dp_bridge_post_disable,
 	.mode_set     = dp_bridge_mode_set,
+	.mode_valid   = dp_bridge_mode_valid,
+	.get_modes    = dp_bridge_get_modes,
+	.detect       = dp_bridge_detect,
 };
 
 struct drm_bridge *msm_dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
@@ -228,7 +178,12 @@ struct drm_bridge *msm_dp_bridge_init(struct msm_dp *dp_display, struct drm_devi
 
 	bridge = &dp_bridge->bridge;
 	bridge->funcs = &dp_bridge_ops;
-	bridge->encoder = encoder;
+	bridge->type = dp_display->connector_type;
+
+	bridge->ops =
+		DRM_BRIDGE_OP_DETECT |
+		DRM_BRIDGE_OP_HPD |
+		DRM_BRIDGE_OP_MODES;
 
 	drm_bridge_add(bridge);
 
@@ -253,3 +208,17 @@ struct drm_bridge *msm_dp_bridge_init(struct msm_dp *dp_display, struct drm_devi
 
 	return bridge;
 }
+
+/* connector initialization */
+struct drm_connector *dp_drm_connector_init(struct msm_dp *dp_display)
+{
+	struct drm_connector *connector = NULL;
+
+	connector = drm_bridge_connector_init(dp_display->drm_dev, dp_display->encoder);
+	if (IS_ERR(connector))
+		return connector;
+
+	drm_connector_attach_encoder(connector, dp_display->encoder);
+
+	return connector;
+}