[51/71] drm/radeon/kms: fix extended lvds info parsing

From: Greg KH
Date: Thu May 19 2011 - 14:14:39 EST


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

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

From: Alex Deucher <alexdeucher@xxxxxxxxx>

commit 05fa7ea7d23980de0014417a0e0af2048a0f9fc1 upstream.

On rev <= 1.1 tables, the offset is absolute,
on newer tables, it's relative.

Fixes:
https://bugzilla.redhat.com/show_bug.cgi?id=700326

Signed-off-by: Alex Deucher <alexdeucher@xxxxxxxxx>
Reviewed-by: Jerome Glisse <jglisse@xxxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
drivers/gpu/drm/radeon/radeon_atombios.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1574,9 +1574,17 @@ struct radeon_encoder_atom_dig *radeon_a
ATOM_FAKE_EDID_PATCH_RECORD *fake_edid_record;
ATOM_PANEL_RESOLUTION_PATCH_RECORD *panel_res_record;
bool bad_record = false;
- u8 *record = (u8 *)(mode_info->atom_context->bios +
- data_offset +
- le16_to_cpu(lvds_info->info.usModePatchTableOffset));
+ u8 *record;
+
+ if ((frev == 1) && (crev < 2))
+ /* absolute */
+ record = (u8 *)(mode_info->atom_context->bios +
+ le16_to_cpu(lvds_info->info.usModePatchTableOffset));
+ else
+ /* relative */
+ record = (u8 *)(mode_info->atom_context->bios +
+ data_offset +
+ le16_to_cpu(lvds_info->info.usModePatchTableOffset));
while (*record != ATOM_RECORD_END_TYPE) {
switch (*record) {
case LCD_MODE_PATCH_RECORD_MODE_TYPE:


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