Re: [v3] drm/dp/dsc: Add Support for all BPCs supported by TGL

[Manasi Navare <manasi.d.navare@intel.com>]

On Thu, Aug 15, 2019 at 01:54:20PM -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.
> 
> v2: Remove the separate define TGL_DP_DSC_MAX_SUPPORTED_BPC
> and use the value directly.(More such defines can be removed
> as part of future patches). (Ville)
> 
> v3: Use values directly instead of accessing the defines
> everytime for min and max DSC BPC.
> 
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Manasi Navare <manasi.d.navare@intel.com>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>

Looks good to me,

Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>

Manasi

> ---
>  drivers/gpu/drm/i915/display/intel_dp.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 4884c87c8ed7..f9d2438d7da9 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -70,8 +70,6 @@
>  
>  /* DP DSC small joiner has 2 FIFOs each of 640 x 6 bytes */
>  #define DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER	61440
> -#define DP_DSC_MIN_SUPPORTED_BPC		8
> -#define DP_DSC_MAX_SUPPORTED_BPC		10
>  
>  /* DP DSC throughput values used for slice count calculations KPixels/s */
>  #define DP_DSC_PEAK_PIXEL_RATE			2720000
> @@ -1915,11 +1913,17 @@ 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);
> +	/* Max DSC Input BPC for ICL is 10 and for TGL+ is 12 */
> +	if (INTEL_GEN(dev_priv) >= 12)
> +		dsc_max_bpc = min_t(u8, 12, conn_state->max_requested_bpc);
> +	else
> +		dsc_max_bpc = min_t(u8, 10,
> +				    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) {
> +
> +	/* Min Input BPC for ICL+ is 8 */
> +	if (pipe_bpp < 8 * 3) {
>  		DRM_DEBUG_KMS("No DSC support for less than 8bpc\n");
>  		return -EINVAL;
>  	}
> -- 
> 2.22.1
> 
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