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 SDVO.
V2:
- removed computation for max pixel clock
V3:
- cleanup by removing unnecessary lines
V4:
- max_pixclk variable renamed as max_dotclk
Signed-off-by: Mika Kahola <mika.kah...@intel.com>
---
drivers/gpu/drm/i915/intel_sdvo.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c
b/drivers/gpu/drm/i915/intel_sdvo.c
index 2e1da06..4ecc076 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1527,6 +1527,7 @@ intel_sdvo_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
struct intel_sdvo *intel_sdvo = intel_attached_sdvo(connector);
+ int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
return MODE_NO_DBLESCAN;
@@ -1537,6 +1538,9 @@ intel_sdvo_mode_valid(struct drm_connector *connector,
if (intel_sdvo->pixel_clock_max < mode->clock)
return MODE_CLOCK_HIGH;
+ if (mode->clock > max_dotclk)
+ return MODE_CLOCK_HIGH;
+
if (intel_sdvo->is_lvds) {
if (mode->hdisplay > intel_sdvo->sdvo_lvds_fixed_mode->hdisplay)
return MODE_PANEL;
--
1.9.1
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