[Intel-gfx] [PATCH] drm/i915/skl: Increase ddb blocks to support large cursor sizes

[Ville Syrjälä]

On Wed, Dec 16, 2015 at 07:06:20PM -0800, Radhakrishna Sripada wrote:
> Original value of 32 blocks is not sufficient when using cursor size of
> 256x256 causing FIFO underruns when the reworked wm
> caluclations in
> 
> commit 024c9045221fe45482863c47c4b4c47d37f97cbf
> Author: Matt Roper <matthew.d.roper at intel.com>
> Date:   Thu Sep 24 15:53:11 2015 -0700
> 
>     drm/i915/skl: Eliminate usage of pipe_wm_parameters from SKL-style WM (v4)

Well that commit is obviously incorrect. It's now using the pipe src
width as the plane width for all planes.

> 
> are used. Increasing the number of blocks to 52 to make cursor plane tolerate
> SAGV block time for the maximum possible cursor size.
> 
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> Signed-off-by: Kalyan Kondapally <kalyan.kondapally at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_pm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index d385d99..137fb68 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -2802,7 +2802,7 @@ skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
>  static unsigned int skl_cursor_allocation(const struct intel_wm_config *config)
>  {
>  	if (config->num_pipes_active == 1)
> -		return 32;
> +		return 52;
>  
>  	return 8;
>  }
> -- 
> 1.9.1
> 
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-- 
Ville Syrjälä
Intel OTC