linux-kernel - [PATCH v2] drm/bridge: analogix_dp: Reuse &link_train.training_lane[] to set DPCD DP_TRAINING_LANEx

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Message-Id: <20250912034949.4054878-1-damon.ding@rock-chips.com>
Date: Fri, 12 Sep 2025 11:49:49 +0800
From: Damon Ding <damon.ding@...k-chips.com>
To: andrzej.hajda@...el.com,
	neil.armstrong@...aro.org,
	rfoss@...nel.org
Cc: Laurent.pinchart@...asonboard.com,
	jonas@...boo.se,
	jernej.skrabec@...il.com,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	dmitry.baryshkov@....qualcomm.com,
	dianders@...omium.org,
	m.szyprowski@...sung.com,
	andy.yan@...k-chips.com,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Damon Ding <damon.ding@...k-chips.com>
Subject: [PATCH v2] drm/bridge: analogix_dp: Reuse &link_train.training_lane[] to set DPCD DP_TRAINING_LANEx_SET

In analogix_dp_link_start(), &link_train.training_lane[] is used to
set phy PE/VS configurations, and buf[] is initialized with the same
values to set DPCD DP_TRAINING_LANEx_SET.

It makes sense to reuse &link_train.training_lane[] to set DPCD
DP_TRAINING_LANEx_SET, which can remove the redundant assignments
and make codes more consice.

Signed-off-by: Damon Ding <damon.ding@...k-chips.com>
Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>

---

Changes in v2:
- Add Tested-by tag.
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index a6d4935234c2..0d7941d37771 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -281,12 +281,8 @@ static int analogix_dp_link_start(struct analogix_dp_device *dp)
 	if (retval < 0)
 		return retval;
 
-	for (lane = 0; lane < lane_count; lane++)
-		buf[lane] = DP_TRAIN_PRE_EMPH_LEVEL_0 |
-			    DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
-
-	retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, buf,
-				   lane_count);
+	retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET,
+				   dp->link_train.training_lane, lane_count);
 	if (retval < 0)
 		return retval;
 
-- 
2.34.1