linux-kernel - [067/205] drm/radeon/kms: fix possible mis-detection of sideport on rs690/rs740

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Date:	Fri, 30 Jul 2010 10:51:24 -0700
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,
	Alex Deucher <alexdeucher@...il.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [067/205] drm/radeon/kms: fix possible mis-detection of sideport on rs690/rs740

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

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

From: Alex Deucher <alexdeucher@...il.com>

commit 5099fa7f23d3711538cbe9fe072b4ce1ba814035 upstream.

Check ulBootUpMemoryClock on AMD IGPs.

Fix regression noticed by Torsten Kaiser <just.for.lkml@...glemail.com>

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

---
 drivers/gpu/drm/radeon/radeon_atombios.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1030,8 +1030,15 @@ bool radeon_atombios_sideport_present(st
 				      data_offset);
 		switch (crev) {
 		case 1:
-			if (igp_info->info.ucMemoryType & 0xf0)
-				return true;
+			/* AMD IGPS */
+			if ((rdev->family == CHIP_RS690) ||
+			    (rdev->family == CHIP_RS740)) {
+				if (igp_info->info.ulBootUpMemoryClock)
+					return true;
+			} else {
+				if (igp_info->info.ucMemoryType & 0xf0)
+					return true;
+			}
 			break;
 		case 2:
 			if (igp_info->info_2.ucMemoryType & 0x0f)


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