Commit 967ba99b authored by Alex Deucher's avatar Alex Deucher Committed by Kamal Mostafa

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

commit 0a90a0cf upstream.

Fixes a broken hsync start value uncovered by:
abc0b144
(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=91401Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarKamal Mostafa <kamal@canonical.com>
parent 9828251f
......@@ -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);
......
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