[PATCH 15/15] drm/i915/tv: Filter out >1024 wide modes that would need vertical scaling on gen3

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Since gen3 can't handle >1024 wide sources with vertical scaling
let's not advertize such modes in the mode list. Less tempetation
to the user to try out things that won't work.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_tv.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
index 7099d837e31a..89c537839273 100644
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -1738,6 +1738,7 @@ intel_tv_set_mode_type(struct drm_display_mode *mode,
 static int
 intel_tv_get_modes(struct drm_connector *connector)
 {
+	struct drm_i915_private *dev_priv = to_i915(connector->dev);
 	const struct tv_mode *tv_mode = intel_tv_mode_find(connector->state);
 	int i, count = 0;
 
@@ -1750,6 +1751,11 @@ intel_tv_get_modes(struct drm_connector *connector)
 		    !tv_mode->component_only)
 			continue;
 
+		/* no vertical scaling with wide sources on gen3 */
+		if (IS_GEN3(dev_priv) && input->w > 1024 &&
+		    input->h > intel_tv_mode_vdisplay(tv_mode))
+			continue;
+
 		mode = drm_mode_create(connector->dev);
 		if (!mode)
 			continue;
-- 
2.18.1