drm/modes: Fix CVT-R modeline generation

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=16651

Signed-off-by: Adam Jackson <ajax@redhat.com>
Tested-by: Adam Serbinski <adam@serbinksi.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index f1f473ea97d3bc3c7af129fe7e364c33e6a02de8..949326d2a8e5b6b3609d002daa75795c7cff6566 100644 (file)
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -251,7 +251,10 @@ struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
                drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
                /* Fill in HSync values */
                drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
-               drm_mode->hsync_start = drm_mode->hsync_end = CVT_RB_H_SYNC;
+               drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
+               /* Fill in VSync values */
+               drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
+               drm_mode->vsync_end = drm_mode->vsync_start + vsync;
        }
        /* 15/13. Find pixel clock frequency (kHz for xf86) */
        drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;