On Thu, Jul 30, 2015 at 09:49:30AM +0300, Mika Kahola wrote:
> 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 HDMI.
>
> V2:
> - removed computation for max dot clock
>
> Signed-off-by: Mika Kahola <mika.kahola@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_hdmi.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index 70bad5b..b85efaa 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1191,15 +1191,22 @@ intel_hdmi_mode_valid(struct drm_connector *connector,
> {
> struct intel_hdmi *hdmi = intel_attached_hdmi(connector);
> struct drm_device *dev = intel_hdmi_to_dev(hdmi);
> + struct drm_i915_private *dev_priv = to_i915(dev);
> enum drm_mode_status status;
> int clock;
> + int max_pixclk = dev_priv->max_dotclk;
>
> if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
> return MODE_NO_DBLESCAN;
>
> clock = mode->clock;
> - if (mode->flags & DRM_MODE_FLAG_DBLCLK)
> + if (mode->flags & DRM_MODE_FLAG_DBLCLK) {
> clock *= 2;
> + max_pixclk *= 2;
> + }
> +
> + if (clock > max_pixclk)
> + return MODE_CLOCK_HIGH;
Or do the test before the DBLCLK?
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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