linux-kernel - [PATCH v2 1/4] drm/bridge: analogix_dp: Apply DP helper API drm_dp_dpcd_read_link

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Message-Id: <20250911112756.4008435-2-damon.ding@rock-chips.com>
Date: Thu, 11 Sep 2025 19:27:53 +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@...aro.org,
	l.stach@...gutronix.de,
	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 1/4] drm/bridge: analogix_dp: Apply DP helper API drm_dp_dpcd_read_link_status()

Use existing DP helper API to read link status related DPCDs.

Signed-off-by: Damon Ding <damon.ding@...k-chips.com>
Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index ed35e567d117..6a3f3fb0ec0a 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -388,13 +388,13 @@ static int analogix_dp_process_clock_recovery(struct analogix_dp_device *dp)
 {
 	int lane, lane_count, retval;
 	u8 voltage_swing, pre_emphasis, training_lane;
-	u8 link_status[2], adjust_request[2];
+	u8 link_status[DP_LINK_STATUS_SIZE], adjust_request[2];
 
 	usleep_range(100, 101);
 
 	lane_count = dp->link_train.lane_count;
 
-	retval = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status, 2);
+	retval = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
 	if (retval < 0)
 		return retval;
 
@@ -454,13 +454,13 @@ static int analogix_dp_process_equalizer_training(struct analogix_dp_device *dp)
 {
 	int lane_count, retval;
 	u32 reg;
-	u8 link_align, link_status[2], adjust_request[2];
+	u8 link_align, link_status[DP_LINK_STATUS_SIZE], adjust_request[2];
 
 	usleep_range(400, 401);
 
 	lane_count = dp->link_train.lane_count;
 
-	retval = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status, 2);
+	retval = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
 	if (retval < 0)
 		return retval;
 
@@ -619,7 +619,7 @@ static int analogix_dp_full_link_train(struct analogix_dp_device *dp,
 static int analogix_dp_fast_link_train(struct analogix_dp_device *dp)
 {
 	int ret;
-	u8 link_align, link_status[2];
+	u8 link_align, link_status[DP_LINK_STATUS_SIZE];
 
 	analogix_dp_set_link_bandwidth(dp, dp->link_train.link_rate);
 	ret = analogix_dp_wait_pll_locked(dp);
@@ -661,8 +661,7 @@ static int analogix_dp_fast_link_train(struct analogix_dp_device *dp)
 			return ret;
 		}
 
-		ret = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status,
-				       2);
+		ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
 		if (ret < 0) {
 			DRM_DEV_ERROR(dp->dev, "Read link status failed %d\n",
 				      ret);
-- 
2.34.1