Patch "drm/amd/display: Disable seamless boot on 128b/132b encoding" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/amd/display: Disable seamless boot on 128b/132b encoding

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amd-display-disable-seamless-boot-on-128b-132b-e.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 55bae345938092f0ad8ef9bcccc9be3e6f222b47
Author: Sung Joon Kim <sungjoon.kim@xxxxxxx>
Date:   Thu Apr 18 16:59:36 2024 -0400

    drm/amd/display: Disable seamless boot on 128b/132b encoding
    
    [ Upstream commit 6f0c228ed9184287031a66b46a79e5a3d2e73a86 ]
    
    [why]
    preOS will not support display mode programming and link training
    for UHBR rates.
    
    [how]
    If we detect a sink that's UHBR capable, disable seamless boot
    
    Reviewed-by: Anthony Koo <anthony.koo@xxxxxxx>
    Acked-by: Wayne Lin <wayne.lin@xxxxxxx>
    Signed-off-by: Sung Joon Kim <sungjoon.kim@xxxxxxx>
    Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 46b10ff8f6d41..72db370e2f21f 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1710,6 +1710,9 @@ bool dc_validate_boot_timing(const struct dc *dc,
 		return false;
 	}
 
+	if (link->dpcd_caps.channel_coding_cap.bits.DP_128b_132b_SUPPORTED)
+		return false;
+
 	if (dc->link_srv->edp_is_ilr_optimization_required(link, crtc_timing)) {
 		DC_LOG_EVENT_LINK_TRAINING("Seamless boot disabled to optimize eDP link rate\n");
 		return false;




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