Re: [PATCH v5 03/36] drm/bridge: analogix_dp: Don't change psr while bridge is disabled

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On Saturday 10 March 2018 03:52 AM, Enric Balletbo i Serra wrote:
From: zain wang <wzz@xxxxxxxxxxxxxx>

There is a race between AUX CH bring-up and enabling bridge which will
cause link training to fail. To avoid hitting it, don't change psr state
while enabling the bridge.

Reviewed-by: Archit Taneja <architt@xxxxxxxxxxxxxx>

Cc: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
Signed-off-by: zain wang <wzz@xxxxxxxxxxxxxx>
Signed-off-by: Caesar Wang <wxt@xxxxxxxxxxxxxx>
[seanpaul fixed up the commit message a bit and renamed *_supported to *_enabled]
Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
Signed-off-by: Thierry Escande <thierry.escande@xxxxxxxxxxxxx>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
Tested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---

  drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 15 ++++++++-------
  drivers/gpu/drm/bridge/analogix/analogix_dp_core.h |  2 +-
  drivers/gpu/drm/rockchip/analogix_dp-rockchip.c    |  2 +-
  include/drm/bridge/analogix_dp.h                   |  2 +-
  4 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index e738aa6de1af..ee00d3d920e0 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -98,18 +98,18 @@ static int analogix_dp_detect_hpd(struct analogix_dp_device *dp)
  	return 0;
  }
-int analogix_dp_psr_supported(struct analogix_dp_device *dp)
+int analogix_dp_psr_enabled(struct analogix_dp_device *dp)
  {
- return dp->psr_support;
+	return dp->psr_enable;
  }
-EXPORT_SYMBOL_GPL(analogix_dp_psr_supported);
+EXPORT_SYMBOL_GPL(analogix_dp_psr_enabled);
int analogix_dp_enable_psr(struct analogix_dp_device *dp)
  {
  	struct edp_vsc_psr psr_vsc;
- if (!dp->psr_support)
+	if (!dp->psr_enable)
  		return 0;
/* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
@@ -131,7 +131,7 @@ int analogix_dp_disable_psr(struct analogix_dp_device *dp)
  	struct edp_vsc_psr psr_vsc;
  	int ret;
- if (!dp->psr_support)
+	if (!dp->psr_enable)
  		return 0;
/* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
@@ -871,8 +871,8 @@ static void analogix_dp_commit(struct analogix_dp_device *dp)
  	/* Enable video */
  	analogix_dp_start_video(dp);
- dp->psr_support = analogix_dp_detect_sink_psr(dp);
-	if (dp->psr_support)
+	dp->psr_enable = analogix_dp_detect_sink_psr(dp);
+	if (dp->psr_enable)
  		analogix_dp_enable_sink_psr(dp);
  }
@@ -1117,6 +1117,7 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
  	if (ret)
  		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
+ dp->psr_enable = false;
  	dp->dpms_mode = DRM_MODE_DPMS_OFF;
  }
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
index b039b28d8fcc..e135a42cb19e 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
@@ -170,7 +170,7 @@ struct analogix_dp_device {
  	int			dpms_mode;
  	int			hpd_gpio;
  	bool                    force_hpd;
-	bool			psr_support;
+	bool			psr_enable;
struct mutex panel_lock;
  	bool			panel_is_modeset;
diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index 36334839a3f8..3e8bf79bea58 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -82,7 +82,7 @@ static void analogix_dp_psr_set(struct drm_encoder *encoder, bool enabled)
  	struct rockchip_dp_device *dp = to_dp(encoder);
  	int ret;
- if (!analogix_dp_psr_supported(dp->adp))
+	if (!analogix_dp_psr_enabled(dp->adp))
  		return;
DRM_DEV_DEBUG(dp->dev, "%s PSR...\n", enabled ? "Entry" : "Exit");
diff --git a/include/drm/bridge/analogix_dp.h b/include/drm/bridge/analogix_dp.h
index 711fff9b6803..e9a1116d2f8e 100644
--- a/include/drm/bridge/analogix_dp.h
+++ b/include/drm/bridge/analogix_dp.h
@@ -41,7 +41,7 @@ struct analogix_dp_plat_data {
  			 struct drm_connector *);
  };
-int analogix_dp_psr_supported(struct analogix_dp_device *dp);
+int analogix_dp_psr_enabled(struct analogix_dp_device *dp);
  int analogix_dp_enable_psr(struct analogix_dp_device *dp);
  int analogix_dp_disable_psr(struct analogix_dp_device *dp);
--
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