diff mbox

[v2,08/11] drm/i915: TV pixel clock check

Message ID 1438238978-10638-9-git-send-email-mika.kahola@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Mika Kahola July 30, 2015, 6:49 a.m. UTC 
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@intel.com>
---
 drivers/gpu/drm/i915/intel_tv.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox

Patch

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)