[Intel-gfx] [PATCH 1/2] drm/i915: Add helper function for getting number of VDSC engines

[Nautiyal, Ankit K]

LGTM.

Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>

On 7/4/2023 6:47 PM, Stanislav Lisovskiy wrote:
> Currently we are using dsc_split and bigjoiner variables for determining
> amount of VDSC instances, however that might change in future, if we happen
> to have more of those.
> So lets pack all that logic into single function for convenience, so that
> at least this isn't hardcoded throughout the whole VDSC code.
>
> v2: - s/u8/int/ (Jani Nikula)
>
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
> ---
>   drivers/gpu/drm/i915/display/intel_vdsc.c | 15 +++++++++++----
>   drivers/gpu/drm/i915/display/intel_vdsc.h |  1 +
>   2 files changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
> index bd9116d2cd76..530f3c08a172 100644
> --- a/drivers/gpu/drm/i915/display/intel_vdsc.c
> +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
> @@ -293,6 +293,16 @@ intel_dsc_power_domain(struct intel_crtc *crtc, enum transcoder cpu_transcoder)
>   		return POWER_DOMAIN_TRANSCODER_VDSC_PW2;
>   }
>   
> +int intel_dsc_get_num_vdsc_instances(const struct intel_crtc_state *crtc_state)
> +{
> +	int num_vdsc_instances = (crtc_state->dsc.dsc_split) ? 2 : 1;
> +
> +	if (crtc_state->bigjoiner_pipes)
> +		num_vdsc_instances *= 2;
> +
> +	return num_vdsc_instances;
> +}
> +
>   static void intel_dsc_pps_configure(const struct intel_crtc_state *crtc_state)
>   {
>   	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> @@ -303,11 +313,8 @@ static void intel_dsc_pps_configure(const struct intel_crtc_state *crtc_state)
>   	u32 pps_val = 0;
>   	u32 rc_buf_thresh_dword[4];
>   	u32 rc_range_params_dword[8];
> -	u8 num_vdsc_instances = (crtc_state->dsc.dsc_split) ? 2 : 1;
>   	int i = 0;
> -
> -	if (crtc_state->bigjoiner_pipes)
> -		num_vdsc_instances *= 2;
> +	int num_vdsc_instances = intel_dsc_get_num_vdsc_instances(crtc_state);
>   
>   	/* Populate PICTURE_PARAMETER_SET_0 registers */
>   	pps_val = DSC_VER_MAJ | vdsc_cfg->dsc_version_minor <<
> diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.h b/drivers/gpu/drm/i915/display/intel_vdsc.h
> index 8763f00fa7e2..2cc41ff08909 100644
> --- a/drivers/gpu/drm/i915/display/intel_vdsc.h
> +++ b/drivers/gpu/drm/i915/display/intel_vdsc.h
> @@ -22,6 +22,7 @@ void intel_dsc_get_config(struct intel_crtc_state *crtc_state);
>   enum intel_display_power_domain
>   intel_dsc_power_domain(struct intel_crtc *crtc, enum transcoder cpu_transcoder);
>   struct intel_crtc *intel_dsc_get_bigjoiner_secondary(const struct intel_crtc *primary_crtc);
> +int intel_dsc_get_num_vdsc_instances(const struct intel_crtc_state *crtc_state);
>   void intel_dsc_dsi_pps_write(struct intel_encoder *encoder,
>   			     const struct intel_crtc_state *crtc_state);
>   void intel_dsc_dp_pps_write(struct intel_encoder *encoder,