[PATCH v6 14/15] drm/msm/dp: separate dp_display_prepare() into its own API

[Yongxing Mou <yongxing.mou@oss.qualcomm.com>]

From: Abhinav Kumar <quic_abhinavk@quicinc.com>

For MST, the link setup should only be done once when multiple sinks are
enabled, while stream setup may run multiple times for each sink. Split
the link-related preparation out of msm_dp_display_atomic_enable() so it
can be called separately before the per-stream enable path.

Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Yongxing Mou <yongxing.mou@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 16 +++++++++++-----
 drivers/gpu/drm/msm/dp/dp_display.h |  5 +++--
 drivers/gpu/drm/msm/dp/dp_drm.c     |  6 ++++--
 3 files changed, 18 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 2d5ef087648c..cd1f2899b733 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1403,8 +1403,8 @@ int msm_dp_modeset_init(struct msm_dp *msm_dp_display, struct drm_device *dev,
 	return 0;
 }
 
-void msm_dp_display_atomic_enable(struct msm_dp *msm_dp_display,
-				  struct drm_atomic_commit *state)
+void msm_dp_display_atomic_prepare(struct msm_dp *msm_dp_display,
+				   struct drm_atomic_commit *state)
 {
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *crtc_state;
@@ -1426,10 +1426,16 @@ void msm_dp_display_atomic_enable(struct msm_dp *msm_dp_display,
 	}
 
 	rc = msm_dp_display_prepare_link(dp);
-	if (rc) {
+	if (rc)
 		DRM_ERROR("DP display prepare failed, rc=%d\n", rc);
-		return;
-	}
+}
+
+void msm_dp_display_atomic_enable(struct msm_dp *msm_dp_display)
+{
+	struct msm_dp_display_private *dp;
+	int rc = 0;
+
+	dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
 
 	rc = msm_dp_display_enable(dp);
 	if (rc)
diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
index 5116f7bbbd02..43ed79093e24 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.h
+++ b/drivers/gpu/drm/msm/dp/dp_display.h
@@ -35,8 +35,9 @@ void msm_dp_display_set_psr(struct msm_dp *dp, bool enter);
 void msm_dp_display_debugfs_init(struct msm_dp *msm_dp_display, struct dentry *dentry, bool is_edp);
 void msm_dp_display_atomic_post_disable(struct msm_dp *dp_display);
 void msm_dp_display_atomic_disable(struct msm_dp *dp_display);
-void msm_dp_display_atomic_enable(struct msm_dp *dp_display,
-				  struct drm_atomic_commit *state);
+void msm_dp_display_atomic_prepare(struct msm_dp *dp_display,
+				   struct drm_atomic_commit *state);
+void msm_dp_display_atomic_enable(struct msm_dp *dp_display);
 enum drm_mode_status msm_dp_display_mode_valid(struct msm_dp *dp,
 					       const struct drm_display_info *info,
 					       const struct drm_display_mode *mode);
diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
index 6b8923d9dff4..4bf1a5b7c3f9 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.c
+++ b/drivers/gpu/drm/msm/dp/dp_drm.c
@@ -55,7 +55,8 @@ static void msm_dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
 	struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
 	struct msm_dp *dp = dp_bridge->msm_dp_display;
 
-	msm_dp_display_atomic_enable(dp, state);
+	msm_dp_display_atomic_prepare(dp, state);
+	msm_dp_display_atomic_enable(dp);
 }
 
 static void msm_dp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
@@ -152,7 +153,8 @@ static void msm_edp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
 		return;
 	}
 
-	msm_dp_display_atomic_enable(dp, state);
+	msm_dp_display_atomic_prepare(dp, state);
+	msm_dp_display_atomic_enable(dp);
 }
 
 static void msm_edp_bridge_atomic_disable(struct drm_bridge *drm_bridge,

-- 
2.43.0