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

Fixes a broken hsync start value uncovered by:
abc0b1447d4974963548777a5ba4a4457c82c426
(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

diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c
index 3e5f6b71f3adad72b0aae490ede2ae1f426c9ff5..c097d3a82bda734888ca46d05c14794738163642 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_combios.c
+++ b/drivers/gpu/drm/radeon/radeon_combios.c
@@ -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);