Re: [Intel-gfx] [PATCH 04/13] drm/i915/dp: Update Bigjoiner interface bits for computing compressed bpp

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Fri, May 12, 2023 at 11:54:08AM +0530, Ankit Nautiyal wrote:
> In Bigjoiner check for DSC, bigjoiner interface bits for DP for
> DISPLAY > 13 is 36 (Bspec: 49259).
> 
> v2: Corrected Display ver to 13.
> 
> v3: Follow convention for conditional statement. (Ville)
> 
> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dp.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 24de25551a49..bca80c0793e9 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -783,8 +783,9 @@ u16 intel_dp_dsc_get_max_compressed_bpp(struct drm_i915_private *i915,
>  	bits_per_pixel = min(bits_per_pixel, max_bpp_small_joiner_ram);
>  
>  	if (bigjoiner) {
> +		int bigjoiner_interface_bits = DISPLAY_VER(i915) > 13 ? 36 : 24;

'x >= 14' is the usual convention.

with that
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

>  		u32 max_bpp_bigjoiner =
> -			i915->display.cdclk.max_cdclk_freq * 48 /
> +			i915->display.cdclk.max_cdclk_freq * 2 * bigjoiner_interface_bits /
>  			intel_dp_mode_to_fec_clock(mode_clock);
>  
>  		bits_per_pixel = min(bits_per_pixel, max_bpp_bigjoiner);
> -- 
> 2.25.1

-- 
Ville Syrjälä
Intel