[Intel-gfx] [PATCH 9/9] drm/i915: Double the port clock when using double clocked modes with 12bpc

[Ville Syrjälä]

On Tue, May 05, 2015 at 05:06:27PM +0300, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Currently we're forgetting to double the port clock when using double
> clocked modes with 12bpc on HDMI. We're only accounting for the 1.5x
> factor due to the 12bpc. So further double the 1.5x port clock when we
> have a double clocked mode.
> 
> Unfortunately I don't have any displays that support both 12bpc and
> double clocked modes, so I was unable to test this.

Actually I was able to test this by manually adding some CEA double
clocked modes. My TV happily accepted them even if it didn't list them
in the EDID.

> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_hdmi.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index 1810242..f3eec38 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1248,6 +1248,7 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
>  
>  	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK) {
>  		pipe_config->pixel_multiplier = 2;
> +		clock_12bpc *= 2;
>  	}
>  
>  	if (intel_hdmi->color_range)
> -- 
> 2.0.5
> 
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-- 
Ville Syrjälä
Intel OTC