[PATCH] drm/i915/vdsc: Add bpc check in intel_dsc_compute_params

[Borah, Chaitanya Kumar]

> -----Original Message-----
> From: Kandpal, Suraj <suraj.kandpal at intel.com>
> Sent: Thursday, September 26, 2024 11:04 AM
> To: intel-gfx at lists.freedesktop.org
> Cc: Golani, Mitulkumar Ajitkumar <mitulkumar.ajitkumar.golani at intel.com>;
> Borah, Chaitanya Kumar <chaitanya.kumar.borah at intel.com>; Kandpal, Suraj
> <suraj.kandpal at intel.com>
> Subject: [PATCH] drm/i915/vdsc: Add bpc check in
> intel_dsc_compute_params
> 
> DSC does not support bpc under 8 according to DSC 1.2a Section 2
> Requirements. Return an error if that happens to be the case.
> 
> --v2
> -should be bits_per_component [Mitul/Chaitanya/Srikanth] -Add reference to
> this restriction [Chaitanya]
> 
> Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>

LGTM


Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah at intel.com>


> ---
>  drivers/gpu/drm/i915/display/intel_vdsc.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c
> b/drivers/gpu/drm/i915/display/intel_vdsc.c
> index 8158e3702ed5..7a30fdea16da 100644
> --- a/drivers/gpu/drm/i915/display/intel_vdsc.c
> +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
> @@ -306,6 +306,11 @@ int intel_dsc_compute_params(struct
> intel_crtc_state *pipe_config)
> 
>  	vdsc_cfg->bits_per_component = pipe_config->pipe_bpp / 3;
> 
> +	if (vdsc_cfg->bits_per_component < 8) {
> +		drm_dbg_kms(&dev_priv->drm, "DSC bpc requirements not
> met\n");
> +		return -EINVAL;
> +	}
> +
>  	drm_dsc_set_rc_buf_thresh(vdsc_cfg);
> 
>  	/*
> --
> 2.43.2