From: zain wang <w...@rock-chips.com>

Panel would reset its setting when it powers down. It would forget the last
succeeded link training setting. So we can't use the last successful link
training setting to do fast link training. Let's reset fast_train_enable in
analogix_dp_bridge_disable();

Cc: St├ęphane Marchesin <marc...@chromium.org>
Signed-off-by: zain wang <w...@rock-chips.com>
Signed-off-by: Sean Paul <seanp...@chromium.org>
Signed-off-by: Thierry Escande <thierry.esca...@collabora.com>
Signed-off-by: Enric Balletbo i Serra <enric.balle...@collabora.com>
---

 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 9 +++++----
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.h | 2 +-
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c 
b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index f9661b410cb9..ea7a80a989c6 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -579,14 +579,14 @@ static int analogix_dp_process_equalizer_training(struct 
analogix_dp_device *dp)
                if (retval != 1) {
                        dev_err(dp->dev, "failed to read downspread %d\n",
                                retval);
-                       dp->fast_train_support = false;
+                       dp->fast_train_enable = false;
                } else {
-                       dp->fast_train_support =
+                       dp->fast_train_enable =
                                (spread & DP_NO_AUX_HANDSHAKE_LINK_TRAINING) ?
                                        true : false;
                }
                dev_dbg(dp->dev, "fast link training %s\n",
-                       dp->fast_train_support ? "supported" : "unsupported");
+                       dp->fast_train_enable ? "supported" : "unsupported");
 
                /* set enhanced mode if available */
                analogix_dp_set_enhanced_mode(dp);
@@ -793,7 +793,7 @@ static int analogix_dp_fast_link_train(struct 
analogix_dp_device *dp)
 
 static int analogix_dp_train_link(struct analogix_dp_device *dp)
 {
-       if (dp->fast_train_support)
+       if (dp->fast_train_enable)
                return analogix_dp_fast_link_train(dp);
 
        return analogix_dp_full_link_train(dp, dp->video_info.max_lane_count,
@@ -1197,6 +1197,7 @@ static void analogix_dp_bridge_disable(struct drm_bridge 
*bridge)
                DRM_ERROR("failed to setup the panel ret = %d\n", ret);
 
        dp->psr_enable = false;
+       dp->fast_train_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 6a96ef7e6934..403ff853464b 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
@@ -173,7 +173,7 @@ struct analogix_dp_device {
        int                     hpd_gpio;
        bool                    force_hpd;
        bool                    psr_enable;
-       bool                    fast_train_support;
+       bool                    fast_train_enable;
 
        struct mutex            panel_lock;
        bool                    panel_is_modeset;
-- 
2.16.1

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