From: <gregkh@linuxfoundation.org>
To: george.shen@amd.com,Rodrigo.Siqueira@amd.com,alexander.deucher@amd.com,daniel.wheeler@amd.com
Cc: <stable@vger.kernel.org>
Subject: FAILED: patch "[PATCH] drm/amd/display: Handle Y carry-over in VCP X.Y calculation" failed to apply to 5.15-stable tree
Date: Mon, 13 May 2024 17:16:48 +0200 [thread overview]
Message-ID: <2024051348-consensus-polygon-1044@gregkh> (raw)
The patch below does not apply to the 5.15-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@vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 719564737a9ac3d0b49c314450b56cf6f7d71358
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024051348-consensus-polygon-1044@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..
Possible dependencies:
719564737a9a ("drm/amd/display: Handle Y carry-over in VCP X.Y calculation")
3bc8d9214679 ("drm/amd/display: Add DP 2.0 HPO Link Encoder")
83228ebb82e4 ("drm/amd/display: Add DP 2.0 HPO Stream Encoder")
61452908a79e ("drm/amd/display: Add DP 2.0 Audio Package Generator")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 719564737a9ac3d0b49c314450b56cf6f7d71358 Mon Sep 17 00:00:00 2001
From: George Shen <george.shen@amd.com>
Date: Thu, 16 Sep 2021 19:55:39 -0400
Subject: [PATCH] drm/amd/display: Handle Y carry-over in VCP X.Y calculation
Theoretically rare corner case where ceil(Y) results in rounding up to
an integer. If this happens, the 1 should be carried over to the X
value.
CC: stable@vger.kernel.org
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: George Shen <george.shen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_link_encoder.c b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_link_encoder.c
index 5b7ad38f85e0..65e45a0b4ff3 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_link_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_link_encoder.c
@@ -395,6 +395,12 @@ void dcn31_hpo_dp_link_enc_set_throttled_vcp_size(
x),
25));
+ // If y rounds up to integer, carry it over to x.
+ if (y >> 25) {
+ x += 1;
+ y = 0;
+ }
+
switch (stream_encoder_inst) {
case 0:
REG_SET_2(DP_DPHY_SYM32_VC_RATE_CNTL0, 0,
reply other threads:[~2024-05-13 15:16 UTC|newest]
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