[Intel-gfx] [PATCH 02/19] drm/i915/dp: Move compressed bpp check with 420 format inside the helper

[Murthy, Arun R]

> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of Ankit
> Nautiyal
> Sent: Thursday, July 13, 2023 4:03 PM
> To: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org
> Subject: [Intel-gfx] [PATCH 02/19] drm/i915/dp: Move compressed bpp check
> with 420 format inside the helper
> 
> Move the check for limiting compressed bite_per_pixel for 420,422 formats
> in the helper to compute bits_per_pixel.
> 
> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
> ---
Looks good!

Reviewed-by: Arun R Murthy <arun.r.murthy at intel.com>

Thanks and Regards,
Arun R Murthy
--------------------

>  drivers/gpu/drm/i915/display/intel_dp.c | 18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> b/drivers/gpu/drm/i915/display/intel_dp.c
> index e0d9618fccab..d1db457fb17c 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -773,6 +773,15 @@ u16 intel_dp_dsc_get_output_bpp(struct
> drm_i915_private *i915,
>  	if (output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
>  		bits_per_pixel *= 2;
> 
> +	/*
> +	 * According to DSC 1.2a Section 4.1.1 Table 4.1 the maximum
> +	 * supported PPS value can be 63.9375 and with the further
> +	 * mention that for 420, 422 formats, bpp should be programmed
> double
> +	 * the target bpp restricting our target bpp to be 31.9375 at max.
> +	 */
> +	if (output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
> +		bits_per_pixel = min_t(u32, bits_per_pixel, 31);
> +
>  	drm_dbg_kms(&i915->drm, "Max link bpp is %u for %u timeslots "
>  				"total bw %u pixel clock %u\n",
>  				bits_per_pixel, timeslots,
> @@ -1738,15 +1747,6 @@ int intel_dp_dsc_compute_config(struct intel_dp
> *intel_dp,
>  							    pipe_config-
> >output_format,
>  							    pipe_bpp,
>  							    timeslots);
> -			/*
> -			 * According to DSC 1.2a Section 4.1.1 Table 4.1 the
> maximum
> -			 * supported PPS value can be 63.9375 and with the
> further
> -			 * mention that bpp should be programmed double
> the target bpp
> -			 * restricting our target bpp to be 31.9375 at max
> -			 */
> -			if (pipe_config->output_format ==
> INTEL_OUTPUT_FORMAT_YCBCR420)
> -				dsc_max_output_bpp = min_t(u16,
> dsc_max_output_bpp, 31 << 4);
> -
>  			if (!dsc_max_output_bpp) {
>  				drm_dbg_kms(&dev_priv->drm,
>  					    "Compressed BPP not
> supported\n");
> --
> 2.40.1