[Intel-gfx] [PATCH] drm/dp/dsc: Add Support for all BPCs supported by TGL

[Ville Syrjälä]

On Wed, Jul 10, 2019 at 04:09:21PM -0700, Anusha Srivatsa wrote:
> DSC engine on ICL supports only 8 and 10 BPC as the input
> BPC. But DSC engine in TGL supports 8, 10 and 12 BPC.
> Add 12 BPC support for DSC while calculating compression
> configuration.
> 
> Cc: Manasi Navare <manasi.d.navare at intel.com>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dp.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 0bdb7ecc5a81..cd089643c80d 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -71,6 +71,7 @@
>  #define DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER	61440
>  #define DP_DSC_MIN_SUPPORTED_BPC		8
>  #define DP_DSC_MAX_SUPPORTED_BPC		10
> +#define TGL_DP_DSC_MAX_SUPPORTED_BPC		12

These defines aren't doing any good IMO. I'd just nuke them.

>  
>  /* DP DSC throughput values used for slice count calculations KPixels/s */
>  #define DP_DSC_PEAK_PIXEL_RATE			2720000
> @@ -1911,8 +1912,12 @@ static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
>  	if (!intel_dp_supports_dsc(intel_dp, pipe_config))
>  		return -EINVAL;
>  
> -	dsc_max_bpc = min_t(u8, DP_DSC_MAX_SUPPORTED_BPC,
> -			    conn_state->max_requested_bpc);
> +	if (INTEL_GEN(dev_priv) > 11)

More customarily >= 12

> +		dsc_max_bpc = min_t(u8, TGL_DP_DSC_MAX_SUPPORTED_BPC,
> +				    conn_state->max_requested_bpc);
> +	else
> +		dsc_max_bpc = min_t(u8, DP_DSC_MAX_SUPPORTED_BPC,
> +				    conn_state->max_requested_bpc);
>  
>  	pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, dsc_max_bpc);
>  	if (pipe_bpp < DP_DSC_MIN_SUPPORTED_BPC * 3) {
> -- 
> 2.21.0
> 
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-- 
Ville Syrjälä
Intel