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drm/i915: DSI pixel clock check 

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 DSI.

V2:
- removed computation for max pixel clock

V3:
- cleanup by removing unnecessary lines

V4:
- max_pixclk variable renamed as max_dotclk
- moved dot clock checking inside 'if (fixed_mode)'

V5:
- dot clock checked against fixed_mode clock

Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Mika Kahola 2015-08-18 14:37:01 +03:00 committed by Daniel Vetter
parent 7f7b58cc61
commit 759a1e9821
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/intel_dsi.c
View File

@ -654,6 +654,7 @@ intel_dsi_mode_valid(struct drm_connector *connector,
{ {
struct intel_connector *intel_connector = to_intel_connector(connector); struct intel_connector *intel_connector = to_intel_connector(connector);
struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode; struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
DRM_DEBUG_KMS("\n"); DRM_DEBUG_KMS("\n");
@ -667,6 +668,8 @@ intel_dsi_mode_valid(struct drm_connector *connector,
return MODE_PANEL; return MODE_PANEL;
if (mode->vdisplay > fixed_mode->vdisplay) if (mode->vdisplay > fixed_mode->vdisplay)
return MODE_PANEL; return MODE_PANEL;
if (fixed_mode->clock > max_dotclk)
return MODE_CLOCK_HIGH;
} }
return MODE_OK; return MODE_OK;