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

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Date:	Sat, 26 Jul 2014 12:02:51 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Dave Airlie <airlied@...hat.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [PATCH 3.15 089/109] Revert "drm/i915: reverse dp link param selection, prefer fast over wide again"

3.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dave Airlie <airlied@...hat.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@...hat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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);


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