[PATCH 23/41] drm/bridge: analogix_dp: Fix incorrect usage of enhanced mode

[Sean Paul]

From: zain wang <wzz at rock-chips.com>

Enhanced mode is required by the eDP 1.2 specification, and not doing it early
could result in a period of time where we have a link transmitting idle packets
without it. Since there is no reason to disable it, we just enable it at the
beginning of link training and then keep it on all the time

Cc: Tomasz Figa <tfiga at chromium.org>
Signed-off-by: zain wang <wzz at rock-chips.com>
Signed-off-by: Sean Paul <seanpaul at chromium.org>
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 043641aa0a6f..8d69d4327871 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -284,6 +284,8 @@ static int analogix_dp_link_start(struct analogix_dp_device *dp)
 	retval = drm_dp_dpcd_write(&dp->aux, DP_LINK_BW_SET, buf, 2);
 	if (retval < 0)
 		return retval;
+	/* set enhanced mode if available */
+	analogix_dp_set_enhanced_mode(dp);
 
 	/* Set TX pre-emphasis to minimum */
 	for (lane = 0; lane < lane_count; lane++)
@@ -596,8 +598,6 @@ static int analogix_dp_process_equalizer_training(struct analogix_dp_device *dp)
 		dev_dbg(dp->dev, "fast link training %s\n",
 			dp->fast_train_enable ? "supported" : "unsupported");
 
-		/* set enhanced mode if available */
-		analogix_dp_set_enhanced_mode(dp);
 		dp->link_train.lt_state = FINISHED;
 
 		return 0;
@@ -947,8 +947,6 @@ static int analogix_dp_commit(struct analogix_dp_device *dp)
 	}
 
 	analogix_dp_enable_scramble(dp, 1);
-	analogix_dp_enable_rx_to_enhanced_mode(dp, 1);
-	analogix_dp_enable_enhanced_mode(dp, 1);
 
 	analogix_dp_init_video(dp);
 	ret = analogix_dp_config_video(dp);
-- 
2.12.0.246.ga2ecc84866-goog