linux-kernel - [PATCH v2 09/43] drm/bridge: analogix_dp: Don't change psr while bridge is disabled

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Message-Id: <20180126131710.7622-10-thierry.escande@collabora.com>
Date:   Fri, 26 Jan 2018 14:16:36 +0100
From:   Thierry Escande <thierry.escande@...labora.com>
To:     Archit Taneja <architt@...eaurora.org>,
        Inki Dae <inki.dae@...sung.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Sandy Huang <hjc@...k-chips.com>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        Tomasz Figa <tfiga@...omium.org>
Cc:     Haixia Shi <hshi@...omium.org>,
        Ørjan Eide <orjan.eide@....com>,
        Zain Wang <wzz@...k-chips.com>,
        Yakir Yang <ykk@...k-chips.com>, Lin Huang <hl@...k-chips.com>,
        Douglas Anderson <dianders@...omium.org>,
        Mark Yao <mark.yao@...k-chips.com>,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH v2 09/43] drm/bridge: analogix_dp: Don't change psr while bridge is disabled

From: zain wang <wzz@...k-chips.com>

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.

Cc: Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc: Sean Paul <seanpaul@...omium.org>
Signed-off-by: zain wang <wzz@...k-chips.com>
Signed-off-by: Caesar Wang <wxt@...k-chips.com>
[seanpaul fixed up the commit message a bit and renamed *_supported to *_enabled]
Signed-off-by: Sean Paul <seanpaul@...omium.org>
Signed-off-by: Thierry Escande <thierry.escande@...labora.com>
---
 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 b52de046f5f1..84141571e960 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 */
@@ -875,8 +875,8 @@ 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);
 }
 
@@ -1118,6 +1118,7 @@ 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 5518fc75dd6e..c2788483c882 100644
--- a/include/drm/bridge/analogix_dp.h
+++ b/include/drm/bridge/analogix_dp.h
@@ -40,7 +40,7 @@ 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);
 
-- 
2.14.1