Re: [PATCH 02/13] drm/i915: Extract broadwell_calc_cdclk()

[Jani Nikula <jani.nikula@linux.intel.com>]

On Wed, 11 May 2016, ville.syrjala@linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> Try to reduce the amount of duplicated cdclk magic numbers by
> moving the max_pixclk->cdclk conversion into a helper.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

Reviewed-by: Jani Nikula <jani.nikula@intel.com>


> ---
>  drivers/gpu/drm/i915/intel_display.c | 23 ++++++++++++++---------
>  1 file changed, 14 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 775ab3cf1eee..b55075e6020c 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -9675,6 +9675,18 @@ static void broadwell_set_cdclk(struct drm_device *dev, int cdclk)
>  	     cdclk, dev_priv->cdclk_freq);
>  }
>  
> +static int broadwell_calc_cdclk(int max_pixclk)
> +{
> +	if (max_pixclk > 540000)
> +		return 675000;
> +	else if (max_pixclk > 450000)
> +		return 540000;
> +	else if (max_pixclk > 337500)
> +		return 450000;
> +	else
> +		return 337500;
> +}
> +
>  static int broadwell_modeset_calc_cdclk(struct drm_atomic_state *state)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(state->dev);
> @@ -9686,14 +9698,7 @@ static int broadwell_modeset_calc_cdclk(struct drm_atomic_state *state)
>  	 * FIXME should also account for plane ratio
>  	 * once 64bpp pixel formats are supported.
>  	 */
> -	if (max_pixclk > 540000)
> -		cdclk = 675000;
> -	else if (max_pixclk > 450000)
> -		cdclk = 540000;
> -	else if (max_pixclk > 337500)
> -		cdclk = 450000;
> -	else
> -		cdclk = 337500;
> +	cdclk = broadwell_calc_cdclk(max_pixclk);
>  
>  	if (cdclk > dev_priv->max_cdclk_freq) {
>  		DRM_DEBUG_KMS("requested cdclk (%d kHz) exceeds max (%d kHz)\n",
> @@ -9703,7 +9708,7 @@ static int broadwell_modeset_calc_cdclk(struct drm_atomic_state *state)
>  
>  	intel_state->cdclk = intel_state->dev_cdclk = cdclk;
>  	if (!intel_state->active_crtcs)
> -		intel_state->dev_cdclk = 337500;
> +		intel_state->dev_cdclk = broadwell_calc_cdclk(0);
>  
>  	return 0;
>  }

-- 
Jani Nikula, Intel Open Source Technology Center
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