drm/bridge: analogix_dp: Don't use fast link training when panel just powered up

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: Stéphane Marchesin <marcheu@chromium.org>
Signed-off-by: zain wang <wzz@rock-chips.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180423105003.9004-4-enric.balletbo@collabora.com

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 05a0ca4..85dbb1c 100644 (file)
--- 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 6a96ef7..403ff85 100644 (file)
--- 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;