[Intel-gfx] [PATCH 5/9] drm/i915: use the correct clock when calculating linetime watermarks

[Ville Syrjälä]

On Fri, May 03, 2013 at 05:23:41PM -0300, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zanoni at intel.com>
> 
> If we're using DP/eDP, adjusted_mode->clock may be just the port link
> clock, but we also can't use mode->clock because it's wrong when we're
> using the using panel fitter.
> 
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/intel_pm.c |    8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 8468b40..3ca020c 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -2021,6 +2021,7 @@ haswell_update_linetime_wm(struct drm_device *dev, struct drm_crtc *crtc)
>  	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
>  	enum pipe pipe = intel_crtc->pipe;
>  	struct drm_display_mode *mode = &intel_crtc->config.adjusted_mode;
> +	int target_clock;
>  	u32 temp;
>  
>  	if (!intel_crtc_active(crtc)) {
> @@ -2028,6 +2029,11 @@ haswell_update_linetime_wm(struct drm_device *dev, struct drm_crtc *crtc)
>  		return;
>  	}
>  
> +	if (intel_crtc->config.pixel_target_clock)
> +		target_clock = intel_crtc->config.pixel_target_clock;
> +	else
> +		target_clock = intel_crtc->config.adjusted_mode.clock;
> +
>  	temp = I915_READ(PIPE_WM_LINETIME(pipe));
>  	temp &= ~PIPE_WM_LINETIME_MASK;
>  
> @@ -2035,7 +2041,7 @@ haswell_update_linetime_wm(struct drm_device *dev, struct drm_crtc *crtc)
>  	 * row at the given clock rate, multiplied by 8.
>  	 * */
>  	temp |= PIPE_WM_LINETIME_TIME(
> -		DIV_ROUND_CLOSEST(mode->htotal * 1000 * 8, mode->clock));
> +		DIV_ROUND_CLOSEST(mode->htotal * 1000 * 8, target_clock));
>  
>  	/* IPS watermarks are only used by pipe A, and are ignored by
>  	 * pipes B and C.  They are calculated similarly to the common
> -- 
> 1.7.10.4
> 
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-- 
Ville Syrjälä
Intel OTC