Re: [PATCH v2 4/4] drm/msm/dsi: switch to DRM_PANEL_BRIDGE

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On 7/11/2022 2:43 AM, Dmitry Baryshkov wrote:
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@xxxxxxxxxx>
---
  drivers/gpu/drm/msm/dsi/dsi.c         |  38 +---
  drivers/gpu/drm/msm/dsi/dsi.h         |  14 +-
  drivers/gpu/drm/msm/dsi/dsi_host.c    |  25 ---
  drivers/gpu/drm/msm/dsi/dsi_manager.c | 264 ++------------------------
  4 files changed, 26 insertions(+), 315 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c
index 1625328fa430..3c53e28092db 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.c
+++ b/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;
-}

panel_bridge doesnt have the best_encoder method today.
Today, this does not break anything for us.
But, for future if we do need it, panel_bridge needs to be expanded to add that method?

-
  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 +212,7 @@ 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;
+	struct drm_connector *connector;
  	int ret;
if (WARN_ON(!encoder) || WARN_ON(!msm_dsi) || WARN_ON(!dev))
@@ -254,26 +246,12 @@ 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);
+	connector = msm_dsi_manager_ext_bridge_init(msm_dsi->id);
+
+	if (IS_ERR(connector)) {
+		ret = PTR_ERR(connector);
  		DRM_DEV_ERROR(dev->dev,
  			"failed to create dsi connector: %d\n", ret);
-		msm_dsi->connector = NULL;
  		goto fail;
  	}
@@ -287,12 +265,6 @@ 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;
  }
diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
index 580a1e6358bf..41630b8f5358 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.h
+++ b/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"
@@ -49,8 +48,6 @@ 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;
@@ -58,10 +55,8 @@ 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;
@@ -76,7 +71,6 @@ 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_cmd_xfer(int id, const struct mipi_dsi_msg *msg);
  bool msm_dsi_manager_cmd_xfer_trigger(int id, u32 dma_base, u32 len);
@@ -87,11 +81,9 @@ 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,
@@ -116,9 +108,7 @@ 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,
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index fb5ab6c718c8..5a18aa710d00 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -164,7 +164,6 @@ struct msm_dsi_host {
  	struct msm_display_dsc_config *dsc;
/* connected device info */
-	struct device_node *device_node;
  	unsigned int channel;
  	unsigned int lanes;
  	enum mipi_dsi_pixel_format format;
@@ -1721,8 +1720,6 @@ 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);
  	if (msm_host->dev)
  		queue_work(msm_host->workqueue, &msm_host->hpd_work);
@@ -1988,16 +1985,6 @@ 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");
@@ -2678,23 +2665,11 @@ 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);
diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index cb84d185d73a..3970368e07d5 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -214,39 +214,26 @@ static void dsi_mgr_phy_disable(int id)
  	}
  }
-struct dsi_connector {
-	struct drm_connector base;
-	int id;
-};
-
  struct dsi_bridge {
  	struct drm_bridge base;
  	int id;
  };
-#define to_dsi_connector(x) container_of(x, struct dsi_connector, base)
  #define to_dsi_bridge(x) container_of(x, struct dsi_bridge, base)
-static inline int dsi_mgr_connector_get_id(struct drm_connector *connector)
-{
-	struct dsi_connector *dsi_connector = to_dsi_connector(connector);
-	return dsi_connector->id;
-}
-
  static int dsi_mgr_bridge_get_id(struct drm_bridge *bridge)
  {
  	struct dsi_bridge *dsi_bridge = to_dsi_bridge(bridge);
  	return dsi_bridge->id;
  }
-static int msm_dsi_manager_panel_init(struct drm_connector *conn, u8 id)
+static void msm_dsi_manager_set_split_display(u8 id)
  {
-	struct msm_drm_private *priv = conn->dev->dev_private;
-	struct msm_kms *kms = priv->kms;
  	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
  	struct msm_dsi *other_dsi = dsi_mgr_get_other_dsi(id);
+	struct msm_drm_private *priv = msm_dsi->dev->dev_private;
+	struct msm_kms *kms = priv->kms;
  	struct msm_dsi *master_dsi, *slave_dsi;
-	struct drm_panel *panel;
if (IS_BONDED_DSI() && !IS_MASTER_DSI_LINK(id)) {
  		master_dsi = other_dsi;
@@ -256,89 +243,18 @@ static int msm_dsi_manager_panel_init(struct drm_connector *conn, u8 id)
  		slave_dsi = other_dsi;
  	}
- /*
-	 * There is only 1 panel in the global panel list for bonded DSI mode.
-	 * Therefore slave dsi should get the drm_panel instance from master
-	 * dsi.
-	 */
-	panel = msm_dsi_host_get_panel(master_dsi->host);
-	if (IS_ERR(panel)) {
-		DRM_ERROR("Could not find panel for %u (%ld)\n", msm_dsi->id,
-			  PTR_ERR(panel));
-		return PTR_ERR(panel);
-	}
-
-	if (!panel || !IS_BONDED_DSI())
-		goto out;
-
-	drm_object_attach_property(&conn->base,
-				   conn->dev->mode_config.tile_property, 0);
+	if (!msm_dsi->external_bridge || !IS_BONDED_DSI())
+		return;
/*
  	 * Set split display info to kms once bonded DSI panel is connected to
  	 * both hosts.
  	 */
-	if (other_dsi && other_dsi->panel && kms->funcs->set_split_display) {
+	if (other_dsi && other_dsi->external_bridge && kms->funcs->set_split_display) {
  		kms->funcs->set_split_display(kms, master_dsi->encoder,
  					      slave_dsi->encoder,
  					      msm_dsi_is_cmd_mode(msm_dsi));
  	}
-
-out:
-	msm_dsi->panel = panel;
-	return 0;
-}
-
-static enum drm_connector_status dsi_mgr_connector_detect(
-		struct drm_connector *connector, bool force)
-{
-	int id = dsi_mgr_connector_get_id(connector);
-	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
-
-	return msm_dsi->panel ? connector_status_connected :
-		connector_status_disconnected;
-}
-
-static void dsi_mgr_connector_destroy(struct drm_connector *connector)
-{
-	struct dsi_connector *dsi_connector = to_dsi_connector(connector);
-
-	DBG("");
-
-	drm_connector_cleanup(connector);
-
-	kfree(dsi_connector);
-}
-
-static int dsi_mgr_connector_get_modes(struct drm_connector *connector)
-{
-	int id = dsi_mgr_connector_get_id(connector);
-	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
-	struct drm_panel *panel = msm_dsi->panel;
-	int num;
-
-	if (!panel)
-		return 0;
-
-	/*
-	 * In bonded DSI mode, we have one connector that can be
-	 * attached to the drm_panel.
-	 */
-	num = drm_panel_get_modes(panel, connector);
-	if (!num)
-		return 0;
-
-	return num;
-}
-
-static struct drm_encoder *
-dsi_mgr_connector_best_encoder(struct drm_connector *connector)
-{
-	int id = dsi_mgr_connector_get_id(connector);
-	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
-
-	DBG("");
-	return msm_dsi_get_encoder(msm_dsi);
  }
static void dsi_mgr_bridge_power_on(struct drm_bridge *bridge)
@@ -403,7 +319,6 @@ static void dsi_mgr_bridge_pre_enable(struct drm_bridge *bridge)
  	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
  	struct msm_dsi *msm_dsi1 = dsi_mgr_get_dsi(DSI_1);
  	struct mipi_dsi_host *host = msm_dsi->host;
-	struct drm_panel *panel = msm_dsi->panel;
  	bool is_bonded_dsi = IS_BONDED_DSI();
  	int ret;
@@ -418,18 +333,6 @@ static void dsi_mgr_bridge_pre_enable(struct drm_bridge *bridge)
  	if (!dsi_mgr_power_on_early(bridge))
  		dsi_mgr_bridge_power_on(bridge);
- /* Always call panel functions once, because even for dual panels,
-	 * there is only one drm_panel instance.
-	 */
-	if (panel) {
-		ret = drm_panel_prepare(panel);
-		if (ret) {
-			pr_err("%s: prepare panel %d failed, %d\n", __func__,
-								id, ret);
-			goto panel_prep_fail;
-		}
-	}
-
  	ret = msm_dsi_host_enable(host);
  	if (ret) {
  		pr_err("%s: enable host %d failed, %d\n", __func__, id, ret);
@@ -449,9 +352,6 @@ static void dsi_mgr_bridge_pre_enable(struct drm_bridge *bridge)
  host1_en_fail:
  	msm_dsi_host_disable(host);
  host_en_fail:
-	if (panel)
-		drm_panel_unprepare(panel);
-panel_prep_fail:
return;
  }
@@ -469,62 +369,12 @@ void msm_dsi_manager_tpg_enable(void)
  	}
  }
-static void dsi_mgr_bridge_enable(struct drm_bridge *bridge)
-{
-	int id = dsi_mgr_bridge_get_id(bridge);
-	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
-	struct drm_panel *panel = msm_dsi->panel;
-	bool is_bonded_dsi = IS_BONDED_DSI();
-	int ret;
-
-	DBG("id=%d", id);
-	if (!msm_dsi_device_connected(msm_dsi))
-		return;
-
-	/* Do nothing with the host if it is slave-DSI in case of bonded DSI */
-	if (is_bonded_dsi && !IS_MASTER_DSI_LINK(id))
-		return;
-
-	if (panel) {
-		ret = drm_panel_enable(panel);
-		if (ret) {
-			pr_err("%s: enable panel %d failed, %d\n", __func__, id,
-									ret);
-		}
-	}
-}
-
-static void dsi_mgr_bridge_disable(struct drm_bridge *bridge)
-{
-	int id = dsi_mgr_bridge_get_id(bridge);
-	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
-	struct drm_panel *panel = msm_dsi->panel;
-	bool is_bonded_dsi = IS_BONDED_DSI();
-	int ret;
-
-	DBG("id=%d", id);
-	if (!msm_dsi_device_connected(msm_dsi))
-		return;
-
-	/* Do nothing with the host if it is slave-DSI in case of bonded DSI */
-	if (is_bonded_dsi && !IS_MASTER_DSI_LINK(id))
-		return;
-
-	if (panel) {
-		ret = drm_panel_disable(panel);
-		if (ret)
-			pr_err("%s: Panel %d OFF failed, %d\n", __func__, id,
-									ret);
-	}
-}
-
  static void dsi_mgr_bridge_post_disable(struct drm_bridge *bridge)
  {
  	int id = dsi_mgr_bridge_get_id(bridge);
  	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
  	struct msm_dsi *msm_dsi1 = dsi_mgr_get_dsi(DSI_1);
  	struct mipi_dsi_host *host = msm_dsi->host;
-	struct drm_panel *panel = msm_dsi->panel;
  	bool is_bonded_dsi = IS_BONDED_DSI();
  	int ret;
@@ -551,13 +401,6 @@ static void dsi_mgr_bridge_post_disable(struct drm_bridge *bridge)
  			pr_err("%s: host1 disable failed, %d\n", __func__, ret);
  	}
- if (panel) {
-		ret = drm_panel_unprepare(panel);
-		if (ret)
-			pr_err("%s: Panel %d unprepare failed,%d\n", __func__,
-								id, ret);
-	}
-
  	msm_dsi_host_disable_irq(host);
  	if (is_bonded_dsi && msm_dsi1)
  		msm_dsi_host_disable_irq(msm_dsi1->host);
@@ -614,76 +457,13 @@ static enum drm_mode_status dsi_mgr_bridge_mode_valid(struct drm_bridge *bridge,
  	return msm_dsi_host_check_dsc(host, mode);
  }
-static const struct drm_connector_funcs dsi_mgr_connector_funcs = {
-	.detect = dsi_mgr_connector_detect,
-	.fill_modes = drm_helper_probe_single_connector_modes,
-	.destroy = dsi_mgr_connector_destroy,
-	.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 dsi_mgr_conn_helper_funcs = {
-	.get_modes = dsi_mgr_connector_get_modes,
-	.best_encoder = dsi_mgr_connector_best_encoder,
-};
-
  static const struct drm_bridge_funcs dsi_mgr_bridge_funcs = {
  	.pre_enable = dsi_mgr_bridge_pre_enable,
-	.enable = dsi_mgr_bridge_enable,
-	.disable = dsi_mgr_bridge_disable,
  	.post_disable = dsi_mgr_bridge_post_disable,
  	.mode_set = dsi_mgr_bridge_mode_set,
  	.mode_valid = dsi_mgr_bridge_mode_valid,
  };
-/* initialize connector when we're connected to a drm_panel */
-struct drm_connector *msm_dsi_manager_connector_init(u8 id)
-{
-	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
-	struct drm_connector *connector = NULL;
-	struct dsi_connector *dsi_connector;
-	int ret;
-
-	dsi_connector = kzalloc(sizeof(*dsi_connector), GFP_KERNEL);
-	if (!dsi_connector)
-		return ERR_PTR(-ENOMEM);
-
-	dsi_connector->id = id;
-
-	connector = &dsi_connector->base;
-
-	ret = drm_connector_init(msm_dsi->dev, connector,
-			&dsi_mgr_connector_funcs, DRM_MODE_CONNECTOR_DSI);
-	if (ret)
-		return ERR_PTR(ret);
-
-	drm_connector_helper_add(connector, &dsi_mgr_conn_helper_funcs);
-
-	/* Enable HPD to let hpd event is handled
-	 * when panel is attached to the host.
-	 */
-	connector->polled = DRM_CONNECTOR_POLL_HPD;

I see that this part gets removed with this migration.

For fixed/built-in displays, it should not matter i think but i am not sure if some usermodes might expect this even for DSI?

So, once again does panel_bridge needs to account for this?


-
-	/* Display driver doesn't support interlace now. */
-	connector->interlace_allowed = 0;
-	connector->doublescan_allowed = 0;
-
-	drm_connector_attach_encoder(connector, msm_dsi->encoder);
-
-	ret = msm_dsi_manager_panel_init(connector, id);
-	if (ret) {
-		DRM_DEV_ERROR(msm_dsi->dev->dev, "init panel failed %d\n", ret);
-		goto fail;
-	}
-
-	return connector;
-
-fail:
-	connector->funcs->destroy(connector);
-	return ERR_PTR(ret);
-}
-
  /* initialize bridge */
  struct drm_bridge *msm_dsi_manager_bridge_init(u8 id)
  {
@@ -732,8 +512,11 @@ struct drm_connector *msm_dsi_manager_ext_bridge_init(u8 id)
  	int ret;
int_bridge = msm_dsi->bridge;
-	ext_bridge = msm_dsi->external_bridge =
-			msm_dsi_host_get_bridge(msm_dsi->host);
+	ext_bridge = devm_drm_of_get_bridge(&msm_dsi->pdev->dev, msm_dsi->pdev->dev.of_node, 1, 0);
+	if (IS_ERR(ext_bridge))
+		return ERR_CAST(ext_bridge);
+
+	msm_dsi->external_bridge = ext_bridge;
encoder = msm_dsi->encoder; @@ -745,25 +528,12 @@ struct drm_connector *msm_dsi_manager_ext_bridge_init(u8 id)
  	ret = drm_bridge_attach(encoder, ext_bridge, int_bridge,
  			DRM_BRIDGE_ATTACH_NO_CONNECTOR);
  	if (ret == -EINVAL) {
-		struct drm_connector *connector;
-		struct list_head *connector_list;
-
  		/* link the internal dsi bridge to the external bridge */
-		drm_bridge_attach(encoder, ext_bridge, int_bridge, 0);
+		ret = drm_bridge_attach(encoder, ext_bridge, int_bridge, 0);
+		if (ret < 0)
+			return ERR_PTR(ret);
- /*
-		 * we need the drm_connector created by the external bridge
-		 * driver (or someone else) to feed it to our driver's
-		 * priv->connector[] list, mainly for msm_fbdev_init()
-		 */
-		connector_list = &dev->mode_config.connector_list;
-
-		list_for_each_entry(connector, connector_list, head) {
-			if (drm_connector_has_possible_encoder(connector, encoder))
-				return connector;
-		}
-
-		return ERR_PTR(-ENODEV);
+		goto out;
  	}
connector = drm_bridge_connector_init(dev, encoder);
@@ -774,6 +544,10 @@ struct drm_connector *msm_dsi_manager_ext_bridge_init(u8 id)
drm_connector_attach_encoder(connector, encoder); +out:
+	/* The pipeline is ready, ping encoders if necessary */
+	msm_dsi_manager_set_split_display(id);
Do you still want to execute msm_dsi_manager_set_split_display even for the error case? Like in the above lines you have replaced the return ERR_PTR() with the goto out. But do you want to then move the set_split_display() call above the out label?

Also, now for the cases where there was an error where the connector was not found, we will return a NULL ptr instead of the ERR_PTR(-ENODEV).
Is that expected?

+
  	return connector;
  }



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