[Intel-gfx] [PATCH v2 08/11] drm/i915: TV pixel clock check

[Mika Kahola]

It is possible the we request to have a mode that has
higher pixel clock than our HW can support. This patch
checks if requested pixel clock is lower than the one
supported by the HW. The requested mode is discarded
if we cannot support the requested pixel clock.

This patch applies to TV.

V2:
- removed computation for max pixel clock

Signed-off-by: Mika Kahola <mika.kahola at 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 8b9d325..0990f22 100644
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -896,7 +896,13 @@ intel_tv_mode_valid(struct drm_connector *connector,
 		    struct drm_display_mode *mode)
 {
 	struct intel_tv *intel_tv = intel_attached_tv(connector);
+	struct drm_device *dev = intel_tv->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
 	const struct tv_mode *tv_mode = intel_tv_mode_find(intel_tv);
+	int max_pixclk = dev_priv->max_dotclk;
+
+	if (mode->clock > max_pixclk)
+		return MODE_CLOCK_HIGH;
 
 	/* Ensure TV refresh is close to desired refresh */
 	if (tv_mode && abs(tv_mode->refresh - drm_mode_vrefresh(mode) * 1000)
-- 
1.9.1