[Intel-gfx] [PATCH 01/15] drm/i915: Allocate min dbuf blocks per bspec

[Ville Syrjälä]

On Fri, Sep 04, 2015 at 07:32:57PM -0700, Chandra Konduru wrote:
> Properly allocate min blocks per hw requirements.
> 
> v2:
> - changed helper functional param to bool, some code simplification (Ville)
> 
> Signed-off-by: Chandra Konduru <chandra.konduru at intel.com>

IIRC I gave my r-b alrady?

But I'll toss it in again:
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/intel_pm.c |   29 +++++++++++++++++++++++++++--
>  1 file changed, 27 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index fff0c22..4d3aca0 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -2959,6 +2959,31 @@ skl_get_total_relative_data_rate(struct intel_crtc *intel_crtc,
>  	return total_data_rate;
>  }
>  
> +static uint16_t
> +skl_dbuf_min_alloc(const struct intel_plane_wm_parameters *p, bool y_plane)
> +{
> +	uint16_t min_alloc;
> +
> +	/* For packed formats, no y-plane, return 0 */
> +	if (y_plane && !p->y_bytes_per_pixel)
> +		return 0;
> +
> +	if (p->tiling == I915_FORMAT_MOD_Y_TILED ||
> +	    p->tiling == I915_FORMAT_MOD_Yf_TILED) {
> +		uint32_t min_scanlines = 8;
> +		uint8_t bytes_per_pixel =
> +			y_plane ? p->y_bytes_per_pixel : p->bytes_per_pixel;
> +
> +		min_scanlines = 32 / bytes_per_pixel;
> +		min_alloc = DIV_ROUND_UP((4 * p->horiz_pixels/(y_plane ? 1 : 2) *
> +			bytes_per_pixel), 512) * min_scanlines/4 + 3;
> +	} else {
> +		min_alloc = 8;
> +	}
> +
> +	return min_alloc;
> +}
> +
>  static void
>  skl_allocate_pipe_ddb(struct drm_crtc *crtc,
>  		      const struct intel_wm_config *config,
> @@ -2999,9 +3024,9 @@ skl_allocate_pipe_ddb(struct drm_crtc *crtc,
>  		if (!p->enabled)
>  			continue;
>  
> -		minimum[plane] = 8;
> +		minimum[plane] = skl_dbuf_min_alloc(p, false);   /* uv-plane/packed */
>  		alloc_size -= minimum[plane];
> -		y_minimum[plane] = p->y_bytes_per_pixel ? 8 : 0;
> +		y_minimum[plane] = skl_dbuf_min_alloc(p, true);  /* y-plane */
>  		alloc_size -= y_minimum[plane];
>  	}
>  
> -- 
> 1.7.9.5
> 
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-- 
Ville Syrjälä
Intel OTC