Re: [PATCH v2 1/3] drm/msm/dsi: Support NO_CONNECTOR bridges

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On 21/09/2021 01:57, Rob Clark wrote:
From: Rob Clark <robdclark@xxxxxxxxxxxx>

For now, since we have a mix of bridges which support this flag, which
which do *not* support this flag, or work both ways, try it once with
NO_CONNECTOR and then fall back to the old way if that doesn't work.
Eventually we can drop the fallback path.

v2: Add missing drm_connector_attach_encoder() so display actually comes
     up when the bridge properly handles the NO_CONNECTOR flag

Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>

I think this patch can go through the drm/msm, while two other patches would need to through the drm-misc. Is it correct?

---
  drivers/gpu/drm/msm/Kconfig           |  2 ++
  drivers/gpu/drm/msm/dsi/dsi_manager.c | 50 ++++++++++++++++++++-------
  2 files changed, 39 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig
index e9c6af78b1d7..36e5ba3ccc28 100644
--- a/drivers/gpu/drm/msm/Kconfig
+++ b/drivers/gpu/drm/msm/Kconfig
@@ -14,6 +14,8 @@ config DRM_MSM
  	select REGULATOR
  	select DRM_KMS_HELPER
  	select DRM_PANEL
+	select DRM_BRIDGE
+	select DRM_PANEL_BRIDGE
  	select DRM_SCHED
  	select SHMEM
  	select TMPFS
diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index c41d39f5b7cf..e25877073d31 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -3,6 +3,8 @@
   * Copyright (c) 2015, The Linux Foundation. All rights reserved.
   */
+#include "drm/drm_bridge_connector.h"
+
  #include "msm_kms.h"
  #include "dsi.h"
@@ -688,10 +690,10 @@ struct drm_connector *msm_dsi_manager_ext_bridge_init(u8 id)
  {
  	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
  	struct drm_device *dev = msm_dsi->dev;
+	struct drm_connector *connector;
  	struct drm_encoder *encoder;
  	struct drm_bridge *int_bridge, *ext_bridge;
-	struct drm_connector *connector;
-	struct list_head *connector_list;
+	int ret;
int_bridge = msm_dsi->bridge;
  	ext_bridge = msm_dsi->external_bridge =
@@ -699,22 +701,44 @@ struct drm_connector *msm_dsi_manager_ext_bridge_init(u8 id)
encoder = msm_dsi->encoder; - /* link the internal dsi bridge to the external bridge */
-	drm_bridge_attach(encoder, ext_bridge, int_bridge, 0);
-
  	/*
-	 * 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()
+	 * Try first to create the bridge without it creating its own
+	 * connector.. currently some bridges support this, and others
+	 * do not (and some support both modes)
  	 */
-	connector_list = &dev->mode_config.connector_list;
+	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);
+
+		/*
+		 * 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;
+		list_for_each_entry(connector, connector_list, head) {
+			if (drm_connector_has_possible_encoder(connector, encoder))
+				return connector;
+		}
+
+		return ERR_PTR(-ENODEV);
+	}
+
+	connector = drm_bridge_connector_init(dev, encoder);
+	if (IS_ERR(connector)) {
+		DRM_ERROR("Unable to create bridge connector\n");
+		return ERR_CAST(connector);
  	}
- return ERR_PTR(-ENODEV);
+	drm_connector_attach_encoder(connector, encoder);
+
+	return connector;
  }
void msm_dsi_manager_bridge_destroy(struct drm_bridge *bridge)



--
With best wishes
Dmitry



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