linux-kernel - [patch 162/176] radeon/kms: fix dp displayport mode validation

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Date:	Tue, 15 Feb 2011 16:22:10 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jerome Glisse <jglisse@...hat.com>,
	Dave Airlie <airlied@...il.com>
Subject: [patch 162/176] radeon/kms: fix dp displayport mode validation

2.6.36-stable review patch.  If anyone has any objections, please let us know.

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

From: Jerome Glisse <jglisse@...hat.com>

commit 6bba2e116808ca12e30c8d88dfedabf8b8d67390 upstream.

Check if there is a big enough dp clock & enough dp lane to
drive the video mode provided.

Signed-off-by: Jerome Glisse <jglisse@...hat.com>
Reviewed-By: Alex Deucher <alexdeucher@...il.com>
Signed-off-by: Dave Airlie <airlied@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/radeon/atombios_dp.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -187,9 +187,9 @@ static int dp_link_clock_for_mode_clock(
 int dp_mode_valid(u8 dpcd[DP_DPCD_SIZE], int mode_clock)
 {
 	int lanes = dp_lanes_for_mode_clock(dpcd, mode_clock);
-	int bw = dp_lanes_for_mode_clock(dpcd, mode_clock);
+	int dp_clock = dp_link_clock_for_mode_clock(dpcd, mode_clock);
 
-	if ((lanes == 0) || (bw == 0))
+	if ((lanes == 0) || (dp_clock == 0))
 		return MODE_CLOCK_HIGH;
 
 	return MODE_OK;


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