This is a note to let you know that I've just added the patch titled
drm/i915: prefer wide & slow to fast & narrow in DP configs
to the 3.5-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-i915-prefer-wide-slow-to-fast-narrow-in-dp-configs.patch
and it can be found in the queue-3.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 2514bc510d0c3aadcc5204056bb440fa36845147 Mon Sep 17 00:00:00 2001
From: Jesse Barnes <[email protected]>
Date: Thu, 21 Jun 2012 15:13:50 -0700
Subject: drm/i915: prefer wide & slow to fast & narrow in DP configs
From: Jesse Barnes <[email protected]>
commit 2514bc510d0c3aadcc5204056bb440fa36845147 upstream.
High frequency link configurations have the potential to cause trouble
with long and/or cheap cables, so prefer slow and wide configurations
instead. This patch has the potential to cause trouble for eDP
configurations that lie about available lanes, so if we run into that we
can make it conditional on eDP.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=45801
Tested-by: [email protected]
Signed-off-by: Jesse Barnes <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Jonathan Nieder <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/gpu/drm/i915/intel_dp.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -726,8 +726,8 @@ intel_dp_mode_fixup(struct drm_encoder *
bpp = adjusted_mode->private_flags & INTEL_MODE_DP_FORCE_6BPC ? 18 : 24;
mode_rate = intel_dp_link_required(mode->clock, bpp);
- for (lane_count = 1; lane_count <= max_lane_count; lane_count <<= 1) {
- for (clock = 0; clock <= max_clock; clock++) {
+ for (clock = 0; clock <= max_clock; clock++) {
+ for (lane_count = 1; lane_count <= max_lane_count; lane_count
<<= 1) {
int link_avail =
intel_dp_max_data_rate(intel_dp_link_clock(bws[clock]), lane_count);
if (mode_rate <= link_avail) {
Patches currently in stable-queue which might be from [email protected]
are
queue-3.5/drm-i915-prefer-wide-slow-to-fast-narrow-in-dp-configs.patch
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