From 2f1a904ec548e48e7daa7b54fe18664d5a7e0d44 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Mon, 27 Jul 2015 19:24:31 -0400 Subject: [PATCH] drm/radeon/combios: add some validation of lvds values commit 0a90a0cff9f429f886f423967ae053150dce9259 upstream. 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 Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/radeon/radeon_combios.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c index 68ce36056019..8cac69819054 100644 --- a/drivers/gpu/drm/radeon/radeon_combios.c +++ b/drivers/gpu/drm/radeon/radeon_combios.c @@ -1271,10 +1271,15 @@ 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); -- 2.34.1