[PATCH 3.15 089/109] Revert "drm/i915: reverse dp link param selection, prefer fast over wide again"

Greg Kroah-Hartman
2014-07-26T19:02:51Z

From: Dave Airlie <airlied@redhat.com>

commit c6930992948adf0f8fc1f6ff1da51c5002a2cf95 upstream.

This reverts commit 38aecea0ccbb909d635619cba22f1891e589b434.

This breaks Haswell Thinkpad + Lenovo dock in SST mode with a HDMI monitor attached.

Before this we can 1920x1200 mode, after this we only ever get 1024x768, and
a lot of deferring.

This didn't revert clean, but this should be fine.

bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1117008
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
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
@@ -833,8 +833,8 @@ intel_dp_compute_config(struct intel_enc
mode_rate = intel_dp_link_required(adjusted_mode->crtc_clock,
bpp);

- for (lane_count = min_lane_count; lane_count <= max_lane_count; lane_count <<= 1) {
- for (clock = min_clock; clock <= max_clock; clock++) {
+ for (clock = min_clock; clock <= max_clock; clock++) {
+ for (lane_count = min_lane_count; lane_count <= max_lane_count; lane_count <<= 1) {
link_clock = drm_dp_bw_code_to_link_rate(bws[clock]);
link_avail = intel_dp_max_data_rate(link_clock,
lane_count);