This is a note to let you know that I've just added the patch titled
drm/amdgpu: fix DP mode validation
to the 4.4-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-amdgpu-fix-dp-mode-validation.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c47b9e0944e483309d66c807d650ac8b8ceafb57 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Wed, 11 May 2016 16:21:03 -0400
Subject: drm/amdgpu: fix DP mode validation
From: Alex Deucher <alexander.deucher@xxxxxxx>
commit c47b9e0944e483309d66c807d650ac8b8ceafb57 upstream.
Switch the order of the loops to walk the rates on the top
so we exhaust all DP 1.1 rate/lane combinations before trying
DP 1.2 rate/lane combos.
This avoids selecting rates that are supported by the monitor,
but not the connector leading to valid modes getting rejected.
bug:
https://bugs.freedesktop.org/show_bug.cgi?id=95206
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/atombios_dp.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c
+++ b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c
@@ -276,8 +276,8 @@ static int amdgpu_atombios_dp_get_dp_lin
}
}
} else {
- for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
- for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) {
+ for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) {
+ for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
max_pix_clock = (lane_num * link_rates[i] * 8) / bpp;
if (max_pix_clock >= pix_clock) {
*dp_lanes = lane_num;
Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are
queue-4.4/drm-amdgpu-fix-dp-mode-validation.patch
queue-4.4/drm-radeon-fix-dp-mode-validation.patch
queue-4.4/drm-amdgpu-dp-add-back-special-handling-for-nutmeg.patch
queue-4.4/drm-radeon-dp-add-back-special-handling-for-nutmeg.patch
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