drm/edid: Fix sync polarity for secondary GTF curve

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

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 8840066a5775..f1f473ea97d3 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -452,7 +452,10 @@ drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
         }
 
         drm_mode_set_name(drm_mode);
-        drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
+        if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
+                drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
+        else
+                drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
 
         return drm_mode;
 }