Re: [PATCH 2/5] drm/msm/dp: Modify prototype of encoder based API

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On 25/07/2021 07:24, Bjorn Andersson wrote:

Functions in the DisplayPort code that relates to individual instances
(encoders) are passed both the struct msm_dp and the struct drm_encoder. But
in a situation where multiple DP instances would exist this means that
the caller need to resolve which struct msm_dp relates to the struct
drm_encoder at hand.

The information for doing this lookup is available inside the DP driver,
so update the API to take the struct msm_drm_private and the struct
drm_encoder and have the DP code figure out which struct msm_dp the
operation relates to.
Initially I thought to propose moving encoder->dp lookup into dpu code by adding msm_dp_display_get_encoder() function. However as I was writing that, I remembered that at some point I had to refactor my own patchset in the way to get rid of calling msm_FOO_get_encoder().
I'd propose simpler solution. In dpu_encoder_setup() you have the DP index and the encoder. So you can store valid msm_dp pointer in the dpu_encoder_virt and remove all the lookups. Then you can replace all priv->dp with bare dpu_enc->dp accesses. Will this work for you? 



Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
---
  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 17 +++++----
  drivers/gpu/drm/msm/dp/dp_display.c         | 38 +++++++++++++++++----
  drivers/gpu/drm/msm/msm_drv.h               | 31 +++++++++--------
  3 files changed, 56 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 1c04b7cce43e..0d64ef0819af 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -1002,8 +1002,8 @@ static void dpu_encoder_virt_mode_set(struct drm_encoder *drm_enc,
trace_dpu_enc_mode_set(DRMID(drm_enc)); - if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS && priv->dp) 
-		msm_dp_display_mode_set(priv->dp, drm_enc, mode, adj_mode);
+	if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS)
+		msm_dp_display_mode_set(priv, drm_enc, mode, adj_mode);
list_for_each_entry(conn_iter, connector_list, head) 
  		if (conn_iter->encoder == drm_enc)
@@ -1184,9 +1184,8 @@ static void dpu_encoder_virt_enable(struct drm_encoder *drm_enc)
_dpu_encoder_virt_enable_helper(drm_enc); - if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS && priv->dp) { 
-		ret = msm_dp_display_enable(priv->dp,
-						drm_enc);
+	if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS) {
+		ret = msm_dp_display_enable(priv, drm_enc);
  		if (ret) {
  			DPU_ERROR_ENC(dpu_enc, "dp display enable failed: %d\n",
  				ret);
@@ -1226,8 +1225,8 @@ static void dpu_encoder_virt_disable(struct drm_encoder *drm_enc)
  	/* wait for idle */
  	dpu_encoder_wait_for_event(drm_enc, MSM_ENC_TX_COMPLETE);
- if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS && priv->dp) { 
-		if (msm_dp_display_pre_disable(priv->dp, drm_enc))
+	if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS) {
+		if (msm_dp_display_pre_disable(priv, drm_enc))
  			DPU_ERROR_ENC(dpu_enc, "dp display push idle failed\n");
  	}
@@ -1255,8 +1254,8 @@ static void dpu_encoder_virt_disable(struct drm_encoder *drm_enc) DPU_DEBUG_ENC(dpu_enc, "encoder disabled\n"); - if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS && priv->dp) { 
-		if (msm_dp_display_disable(priv->dp, drm_enc))
+	if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS) {
+		if (msm_dp_display_disable(priv, drm_enc))
  			DPU_ERROR_ENC(dpu_enc, "dp display disable failed\n");
  	}
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c 
index 8696b36d30e4..59ffd6c8f41f 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1432,12 +1432,25 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
  	return 0;
  }
-int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder) 
+static struct msm_dp *msm_dp_from_drm_encoder(struct msm_drm_private *priv,
+					      struct drm_encoder *encoder)
+{
+	if (priv->dp && priv->dp->encoder == encoder)
+		return priv->dp;
+
+	return NULL;
+}
+
+int msm_dp_display_enable(struct msm_drm_private *priv, struct drm_encoder *encoder)
  {
  	int rc = 0;
  	struct dp_display_private *dp_display;
+	struct msm_dp *dp = msm_dp_from_drm_encoder(priv, encoder);
  	u32 state;
+ if (!dp) 
+		return -EINVAL;
+
  	dp_display = container_of(dp, struct dp_display_private, dp_display);
  	if (!dp_display->dp_mode.drm_mode.clock) {
  		DRM_ERROR("invalid params\n");
@@ -1489,9 +1502,13 @@ int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder)
  	return rc;
  }
-int msm_dp_display_pre_disable(struct msm_dp *dp, struct drm_encoder *encoder) 
+int msm_dp_display_pre_disable(struct msm_drm_private *priv, struct drm_encoder *encoder)
  {
  	struct dp_display_private *dp_display;
+	struct msm_dp *dp = msm_dp_from_drm_encoder(priv, encoder);
+
+	if (!dp)
+		return 0;
dp_display = container_of(dp, struct dp_display_private, dp_display); @@ -1500,11 +1517,15 @@ int msm_dp_display_pre_disable(struct msm_dp *dp, struct drm_encoder *encoder) 
  	return 0;
  }
-int msm_dp_display_disable(struct msm_dp *dp, struct drm_encoder *encoder) 
+int msm_dp_display_disable(struct msm_drm_private *priv, struct drm_encoder *encoder)
  {
  	int rc = 0;
  	u32 state;
  	struct dp_display_private *dp_display;
+	struct msm_dp *dp = msm_dp_from_drm_encoder(priv, encoder);
+
+	if (!dp)
+		return 0;
dp_display = container_of(dp, struct dp_display_private, dp_display); @@ -1531,11 +1552,16 @@ int msm_dp_display_disable(struct msm_dp *dp, struct drm_encoder *encoder) 
  	return rc;
  }
-void msm_dp_display_mode_set(struct msm_dp *dp, struct drm_encoder *encoder, 
-				struct drm_display_mode *mode,
-				struct drm_display_mode *adjusted_mode)
+void msm_dp_display_mode_set(struct msm_drm_private *priv,
+			     struct drm_encoder *encoder,
+			     struct drm_display_mode *mode,
+			     struct drm_display_mode *adjusted_mode)
  {
  	struct dp_display_private *dp_display;
+	struct msm_dp *dp = msm_dp_from_drm_encoder(priv, encoder);
+
+	if (!dp)
+		return;
dp_display = container_of(dp, struct dp_display_private, dp_display); diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h 
index 9bfd37855969..e9232032b266 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -388,12 +388,13 @@ int __init msm_dp_register(void);
  void __exit msm_dp_unregister(void);
  int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
  			 struct drm_encoder *encoder);
-int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder);
-int msm_dp_display_disable(struct msm_dp *dp, struct drm_encoder *encoder);
-int msm_dp_display_pre_disable(struct msm_dp *dp, struct drm_encoder *encoder);
-void msm_dp_display_mode_set(struct msm_dp *dp, struct drm_encoder *encoder,
-				struct drm_display_mode *mode,
-				struct drm_display_mode *adjusted_mode);
+int msm_dp_display_enable(struct msm_drm_private *priv, struct drm_encoder *encoder);
+int msm_dp_display_disable(struct msm_drm_private *priv, struct drm_encoder *encoder);
+int msm_dp_display_pre_disable(struct msm_drm_private *priv, struct drm_encoder *encoder);
+void msm_dp_display_mode_set(struct msm_drm_private *priv,
+			     struct drm_encoder *encoder,
+			     struct drm_display_mode *mode,
+			     struct drm_display_mode *adjusted_mode);
  void msm_dp_irq_postinstall(struct msm_dp *dp_display);
  void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp_display);
@@ -413,25 +414,25 @@ static inline int msm_dp_modeset_init(struct msm_dp *dp_display, 
  {
  	return -EINVAL;
  }
-static inline int msm_dp_display_enable(struct msm_dp *dp,
+static inline int msm_dp_display_enable(struct msm_drm_private *priv,
  					struct drm_encoder *encoder)
  {
  	return -EINVAL;
  }
-static inline int msm_dp_display_disable(struct msm_dp *dp,
-					struct drm_encoder *encoder)
+static inline int msm_dp_display_disable(struct msm_drm_private *priv,
+					 struct drm_encoder *encoder)
  {
  	return -EINVAL;
  }
-static inline int msm_dp_display_pre_disable(struct msm_dp *dp,
-					struct drm_encoder *encoder)
+static inline int msm_dp_display_pre_disable(struct msm_drm_private *priv,
+					     struct drm_encoder *encoder)
  {
  	return -EINVAL;
  }
-static inline void msm_dp_display_mode_set(struct msm_dp *dp,
-				struct drm_encoder *encoder,
-				struct drm_display_mode *mode,
-				struct drm_display_mode *adjusted_mode)
+static inline void msm_dp_display_mode_set(struct msm_drm_private *priv,
+					   struct drm_encoder *encoder,
+					   struct drm_display_mode *mode,
+					   struct drm_display_mode *adjusted_mode)
  {
  }



--
With best wishes
Dmitry
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