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drm/i915: prefer wide & slow to fast & narrow in DP configs

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commit 2514bc510d 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: peter@colberg.org
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jesse Barnes 2012-06-21 15:13:50 -07:00 committed by Greg Kroah-Hartman
parent b9247be526
commit 6700eb4d0a
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/intel_dp.c
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@ -712,8 +712,8 @@ intel_dp_mode_fixup(struct drm_encoder *encoder, struct drm_display_mode *mode,
bpp = adjusted_mode->private_flags & INTEL_MODE_DP_FORCE_6BPC ? 18 : 24;
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 (intel_dp_link_required(mode->clock, bpp)