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drm/radeon/combios: add some validation of lvds values 

Fixes a broken hsync start value uncovered by:
abc0b1447d
(drm: Perform basic sanity checks on probed modes)

The driver handled the bad hsync start elsewhere, but
the above commit prevented it from getting added.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=91401

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2015-07-27 19:24:31 -04:00
parent 7726e72b3d
commit 0a90a0cff9
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/radeon/radeon_combios.c
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@ -1255,10 +1255,15 @@ struct radeon_encoder_lvds *radeon_combios_get_lvds_info(struct radeon_encoder
if ((RBIOS16(tmp) == lvds->native_mode.hdisplay) &&
(RBIOS16(tmp + 2) == lvds->native_mode.vdisplay)) {
u32 hss = (RBIOS16(tmp + 21) - RBIOS16(tmp + 19) - 1) * 8;
if (hss > lvds->native_mode.hdisplay)
hss = (10 - 1) * 8;
lvds->native_mode.htotal = lvds->native_mode.hdisplay +
(RBIOS16(tmp + 17) - RBIOS16(tmp + 19)) * 8;
lvds->native_mode.hsync_start = lvds->native_mode.hdisplay +
(RBIOS16(tmp + 21) - RBIOS16(tmp + 19) - 1) * 8;
hss;
lvds->native_mode.hsync_end = lvds->native_mode.hsync_start +
(RBIOS8(tmp + 23) * 8);