3.19.8-ckt21 -stable review patch. If anyone has any objections, please let me
know.
---8<------------------------------------------------------------
From: Alex Deucher <alexander.deuc...@amd.com>
commit 3104b8128d4d646a574ed9d5b17c7d10752cd70b upstream.
hw doesn't like a 0 value.
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Kamal Mostafa <ka...@canonical.com>
---
drivers/gpu/drm/radeon/atombios_encoders.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c
b/drivers/gpu/drm/radeon/atombios_encoders.c
index d70de30..7cc216b 100644
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -309,6 +309,10 @@ static bool radeon_atom_mode_fixup(struct drm_encoder
*encoder,
&& (mode->crtc_vsync_start < (mode->crtc_vdisplay + 2)))
adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vdisplay
+ 2;
+ /* vertical FP must be at least 1 */
+ if (mode->crtc_vsync_start == mode->crtc_vdisplay)
+ adjusted_mode->crtc_vsync_start++;
+
/* get the native mode for scaling */
if (radeon_encoder->active_device & (ATOM_DEVICE_LCD_SUPPORT)) {
radeon_panel_mode_fixup(encoder, adjusted_mode);
--
2.7.4
