linux-kernel - FAILED: Patch "drm/amd/display: Add align done check" failed to apply to 4.19-stable tree

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Message-ID: <20240327122904.2843238-1-sashal@kernel.org>
Date: Wed, 27 Mar 2024 08:29:04 -0400
From: Sasha Levin <sashal@...nel.org>
To: stable@...r.kernel.org,
	zhikai.zhai@....com
Cc: Mario Limonciello <mario.limonciello@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Wenjing Liu <wenjing.liu@....com>,
	Aurabindo Pillai <aurabindo.pillai@....com>,
	Daniel Wheeler <daniel.wheeler@....com>,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: FAILED: Patch "drm/amd/display: Add align done check" failed to apply to 4.19-stable tree

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@...r.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

>From 1b5078f01b953a43d6198180ca5b110017315672 Mon Sep 17 00:00:00 2001
From: Zhikai Zhai <zhikai.zhai@....com>
Date: Mon, 29 Jan 2024 17:02:18 +0800
Subject: [PATCH] drm/amd/display: Add align done check

[WHY]
We Double-check link status if training successful,
but miss the lane align status.

[HOW]
Add the lane align status check

Cc: Mario Limonciello <mario.limonciello@....com>
Cc: Alex Deucher <alexander.deucher@....com>
Cc: stable@...r.kernel.org
Reviewed-by: Wenjing Liu <wenjing.liu@....com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@....com>
Signed-off-by: Zhikai Zhai <zhikai.zhai@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
---
 .../gpu/drm/amd/display/dc/link/protocols/link_dp_training.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c
index e06d3c2d89102..e538c67d3ed91 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c
@@ -517,6 +517,7 @@ enum link_training_result dp_check_link_loss_status(
 {
 	enum link_training_result status = LINK_TRAINING_SUCCESS;
 	union lane_status lane_status;
+	union lane_align_status_updated dpcd_lane_status_updated;
 	uint8_t dpcd_buf[6] = {0};
 	uint32_t lane;
 
@@ -532,10 +533,12 @@ enum link_training_result dp_check_link_loss_status(
 		 * check lanes status
 		 */
 		lane_status.raw = dp_get_nibble_at_index(&dpcd_buf[2], lane);
+		dpcd_lane_status_updated.raw = dpcd_buf[4];
 
 		if (!lane_status.bits.CHANNEL_EQ_DONE_0 ||
 			!lane_status.bits.CR_DONE_0 ||
-			!lane_status.bits.SYMBOL_LOCKED_0) {
+			!lane_status.bits.SYMBOL_LOCKED_0 ||
+			!dp_is_interlane_aligned(dpcd_lane_status_updated)) {
 			/* if one of the channel equalization, clock
 			 * recovery or symbol lock is dropped
 			 * consider it as (link has been
-- 
2.43.0