drm/msm/dsi: switch to DRM_PANEL_BRIDGE

Currently the DSI driver has two separate paths: one if the next device
in a chain is a bridge and another one if the panel is connected
directly to the DSI host. Simplify the code path by using panel-bridge
driver (already selected in Kconfig) and dropping support for
handling the panel directly.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/493608/
Link: https://lore.kernel.org/r/20220712132258.671263-1-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/dsi/dsi.c

@@ -6,14 +6,6 @@
 #include "dsi.h"
 #include "dsi_cfg.h"
 
-struct drm_encoder *msm_dsi_get_encoder(struct msm_dsi *msm_dsi)
-{
-	if (!msm_dsi || !msm_dsi_device_connected(msm_dsi))
-		return NULL;
-
-	return msm_dsi->encoder;
-}
-
 bool msm_dsi_is_cmd_mode(struct msm_dsi *msm_dsi)
 {
 	unsigned long host_flags = msm_dsi_host_get_mode_flags(msm_dsi->host);
@@ -220,7 +212,6 @@ int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 			 struct drm_encoder *encoder)
 {
 	struct msm_drm_private *priv;
-	struct drm_bridge *ext_bridge;
 	int ret;
 
 	if (WARN_ON(!encoder) || WARN_ON(!msm_dsi) || WARN_ON(!dev))
@@ -254,26 +245,10 @@ int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 		goto fail;
 	}
 
-	/*
-	 * check if the dsi encoder output is connected to a panel or an
-	 * external bridge. We create a connector only if we're connected to a
-	 * drm_panel device. When we're connected to an external bridge, we
-	 * assume that the drm_bridge driver will create the connector itself.
-	 */
-	ext_bridge = msm_dsi_host_get_bridge(msm_dsi->host);
-
-	if (ext_bridge)
-		msm_dsi->connector =
-			msm_dsi_manager_ext_bridge_init(msm_dsi->id);
-	else
-		msm_dsi->connector =
-			msm_dsi_manager_connector_init(msm_dsi->id);
-
-	if (IS_ERR(msm_dsi->connector)) {
-		ret = PTR_ERR(msm_dsi->connector);
+	ret = msm_dsi_manager_ext_bridge_init(msm_dsi->id);
+	if (ret) {
 		DRM_DEV_ERROR(dev->dev,
 			"failed to create dsi connector: %d\n", ret);
-		msm_dsi->connector = NULL;
 		goto fail;
 	}
 
@@ -287,12 +262,6 @@ int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 		msm_dsi->bridge = NULL;
 	}
 
-	/* don't destroy connector if we didn't make it */
-	if (msm_dsi->connector && !msm_dsi->external_bridge)
-		msm_dsi->connector->funcs->destroy(msm_dsi->connector);
-
-	msm_dsi->connector = NULL;
-
 	return ret;
 }
 

drivers/gpu/drm/msm/dsi/dsi.h

@@ -12,7 +12,6 @@
 #include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_mipi_dsi.h>
-#include <drm/drm_panel.h>
 
 #include "msm_drv.h"
 #include "disp/msm_disp_snapshot.h"
@@ -36,8 +35,6 @@ struct msm_dsi {
 	struct drm_device *dev;
 	struct platform_device *pdev;
 
-	/* connector managed by us when we're connected to a drm_panel */
-	struct drm_connector *connector;
 	/* internal dsi bridge attached to MDP interface */
 	struct drm_bridge *bridge;
 
@@ -45,10 +42,8 @@ struct msm_dsi {
 	struct msm_dsi_phy *phy;
 
 	/*
-	 * panel/external_bridge connected to dsi bridge output, only one of the
-	 * two can be valid at a time
+	 * external_bridge connected to dsi bridge output
 	 */
-	struct drm_panel *panel;
 	struct drm_bridge *external_bridge;
 
 	struct device *phy_dev;
@@ -63,8 +58,7 @@ struct msm_dsi {
 /* dsi manager */
 struct drm_bridge *msm_dsi_manager_bridge_init(u8 id);
 void msm_dsi_manager_bridge_destroy(struct drm_bridge *bridge);
-struct drm_connector *msm_dsi_manager_connector_init(u8 id);
-struct drm_connector *msm_dsi_manager_ext_bridge_init(u8 id);
+int msm_dsi_manager_ext_bridge_init(u8 id);
 int msm_dsi_manager_cmd_xfer(int id, const struct mipi_dsi_msg *msg);
 bool msm_dsi_manager_cmd_xfer_trigger(int id, u32 dma_base, u32 len);
 int msm_dsi_manager_register(struct msm_dsi *msm_dsi);
@@ -74,11 +68,9 @@ void msm_dsi_manager_tpg_enable(void);
 /* msm dsi */
 static inline bool msm_dsi_device_connected(struct msm_dsi *msm_dsi)
 {
-	return msm_dsi->panel || msm_dsi->external_bridge;
+	return msm_dsi->external_bridge;
 }
 
-struct drm_encoder *msm_dsi_get_encoder(struct msm_dsi *msm_dsi);
-
 /* dsi host */
 struct msm_dsi_host;
 int msm_dsi_host_xfer_prepare(struct mipi_dsi_host *host,
@@ -103,9 +95,7 @@ int msm_dsi_host_set_display_mode(struct mipi_dsi_host *host,
 				  const struct drm_display_mode *mode);
 enum drm_mode_status msm_dsi_host_check_dsc(struct mipi_dsi_host *host,
 					    const struct drm_display_mode *mode);
-struct drm_panel *msm_dsi_host_get_panel(struct mipi_dsi_host *host);
 unsigned long msm_dsi_host_get_mode_flags(struct mipi_dsi_host *host);
-struct drm_bridge *msm_dsi_host_get_bridge(struct mipi_dsi_host *host);
 int msm_dsi_host_register(struct mipi_dsi_host *host);
 void msm_dsi_host_unregister(struct mipi_dsi_host *host);
 void msm_dsi_host_set_phy_mode(struct mipi_dsi_host *host,

drivers/gpu/drm/msm/dsi/dsi_host.c

@@ -163,7 +163,6 @@ struct msm_dsi_host {
 	struct drm_dsc_config *dsc;
 
 	/* connected device info */
-	struct device_node *device_node;
 	unsigned int channel;
 	unsigned int lanes;
 	enum mipi_dsi_pixel_format format;
@@ -1628,8 +1627,6 @@ static int dsi_host_detach(struct mipi_dsi_host *host,
 
 	dsi_dev_detach(msm_host->pdev);
 
-	msm_host->device_node = NULL;
-
 	DBG("id=%d", msm_host->id);
 
 	return 0;
@@ -1893,16 +1890,6 @@ static int dsi_host_parse_dt(struct msm_dsi_host *msm_host)
 		goto err;
 	}
 
-	/* Get panel node from the output port's endpoint data */
-	device_node = of_graph_get_remote_node(np, 1, 0);
-	if (!device_node) {
-		DRM_DEV_DEBUG(dev, "%s: no valid device\n", __func__);
-		ret = -ENODEV;
-		goto err;
-	}
-
-	msm_host->device_node = device_node;
-
 	if (of_property_read_bool(np, "syscon-sfpb")) {
 		msm_host->sfpb = syscon_regmap_lookup_by_phandle(np,
 					"syscon-sfpb");
@@ -2587,23 +2574,11 @@ enum drm_mode_status msm_dsi_host_check_dsc(struct mipi_dsi_host *host,
 	return MODE_OK;
 }
 
-struct drm_panel *msm_dsi_host_get_panel(struct mipi_dsi_host *host)
-{
-	return of_drm_find_panel(to_msm_dsi_host(host)->device_node);
-}
-
 unsigned long msm_dsi_host_get_mode_flags(struct mipi_dsi_host *host)
 {
 	return to_msm_dsi_host(host)->mode_flags;
 }
 
-struct drm_bridge *msm_dsi_host_get_bridge(struct mipi_dsi_host *host)
-{
-	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
-
-	return of_drm_find_bridge(msm_host->device_node);
-}
-
 void msm_dsi_host_snapshot(struct msm_disp_state *disp_state, struct mipi_dsi_host *host)
 {
 	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);