Re: [Freedreno] [PATCH v2 02/13] drm/msm/hdmi: switch to devm_drm_bridge_add()

[Abhinav Kumar]

On 10/9/2023 1:53 PM, Dmitry Baryshkov wrote:
On 09/10/2023 22:21, Dmitry Baryshkov wrote:
On 09/10/2023 22:19, Abhinav Kumar wrote:


On 10/9/2023 11:10 AM, Dmitry Baryshkov wrote:
Make MSM HDMI driver use devm_drm_bridge_add() instead of plain
drm_bridge_add(). As the driver doesn't require any additional cleanup,
stop adding created bridge to the priv->bridges array.

Reviewed-by: Rob Clark <robdcl...@gmail.com>
Signed-off-by: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
---
  drivers/gpu/drm/msm/hdmi/hdmi.c        | 22 +++++--------------
  drivers/gpu/drm/msm/hdmi/hdmi.h        |  5 ++---
  drivers/gpu/drm/msm/hdmi/hdmi_bridge.c | 30 
++++++++------------------
  drivers/gpu/drm/msm/hdmi/hdmi_hpd.c    |  3 +--
  4 files changed, 17 insertions(+), 43 deletions(-)

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c 
b/drivers/gpu/drm/msm/hdmi/hdmi.c
index b6bcb9f675fe..c8ebd75176bb 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
@@ -160,24 +160,16 @@ static int msm_hdmi_init(struct hdmi *hdmi)
  int msm_hdmi_modeset_init(struct hdmi *hdmi,
          struct drm_device *dev, struct drm_encoder *encoder)
  {
-    struct msm_drm_private *priv = dev->dev_private;
      int ret;
-    if (priv->num_bridges == ARRAY_SIZE(priv->bridges)) {
-        DRM_DEV_ERROR(dev->dev, "too many bridges\n");
-        return -ENOSPC;
-    }
-
      hdmi->dev = dev;
      hdmi->encoder = encoder;
      hdmi_audio_infoframe_init(&hdmi->audio.infoframe);
-    hdmi->bridge = msm_hdmi_bridge_init(hdmi);
-    if (IS_ERR(hdmi->bridge)) {
-        ret = PTR_ERR(hdmi->bridge);
+    ret = msm_hdmi_bridge_init(hdmi);
+    if (ret) {
          DRM_DEV_ERROR(dev->dev, "failed to create HDMI bridge: 
%d\n", ret);
-        hdmi->bridge = NULL;
          goto fail;
      }
@@ -215,16 +207,9 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
          goto fail;
      }
-    priv->bridges[priv->num_bridges++]       = hdmi->bridge;
-
      return 0;
  fail:
-    /* bridge is normally destroyed by drm: */
-    if (hdmi->bridge) {
-        msm_hdmi_bridge_destroy(hdmi->bridge);
-        hdmi->bridge = NULL;
-    }
      if (hdmi->connector) {
          hdmi->connector->funcs->destroy(hdmi->connector);
          hdmi->connector = NULL;
@@ -395,6 +380,9 @@ static void msm_hdmi_unbind(struct device *dev, 
struct device *master,
          if (priv->hdmi->audio_pdev)
              platform_device_unregister(priv->hdmi->audio_pdev);
+        if (priv->hdmi->bridge)
+            msm_hdmi_hpd_disable(priv->hdmi);
+

Now is this the only place where hdmi->bridge is used?

Why cant we just keep msm_hdmi_hpd_disable(priv->hdmi) here since its 
anyway protected by if (priv->hdmi) and drop hdmi->bridge completely?

Sure, sounds like a good idea, same followup as for the DSI.

I was wrong here. hdmi::bridge is used by the driver (e.g. for HPD 
reporting).


hmmm, I thought HPD module uses hdmi_bridge->hdmi. here we are talking 
about hdmi->bridge?