Re: [Intel-gfx] [PATCH 06/19] drm/i915/dp: Use connector DSC DPCD in intel_dp_dsc_compute_max_bpp()

["Lisovskiy, Stanislav" <stanislav.lisovskiy@intel.com>]

On Fri, Oct 06, 2023 at 04:37:14PM +0300, Imre Deak wrote:
> Use the connector's DSC DPCD capabilities in intel_dp_dsc_compute_max_bpp()
> instead of the version stored in the encoder.
> 
> Signed-off-by: Imre Deak <imre.deak@intel.com>

Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_dp.c     | 13 ++++++++-----
>  drivers/gpu/drm/i915/display/intel_dp.h     |  3 ++-
>  drivers/gpu/drm/i915/display/intel_dp_mst.c |  2 +-
>  3 files changed, 11 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 6e6b3fe593453..00f5fecdbf386 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -1215,7 +1215,7 @@ intel_dp_mode_valid(struct drm_connector *_connector,
>  		 * TBD pass the connector BPC,
>  		 * for now U8_MAX so that max BPC on that platform would be picked
>  		 */
> -		pipe_bpp = intel_dp_dsc_compute_max_bpp(intel_dp, U8_MAX);
> +		pipe_bpp = intel_dp_dsc_compute_max_bpp(connector, U8_MAX);
>  
>  		/*
>  		 * Output bpp is stored in 6.4 format so right shift by 4 to get the
> @@ -1577,9 +1577,10 @@ u8 intel_dp_dsc_max_src_input_bpc(struct drm_i915_private *i915)
>  	return 0;
>  }
>  
> -int intel_dp_dsc_compute_max_bpp(struct intel_dp *intel_dp, u8 max_req_bpc)
> +int intel_dp_dsc_compute_max_bpp(const struct intel_connector *connector,
> +				 u8 max_req_bpc)
>  {
> -	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> +	struct drm_i915_private *i915 = to_i915(connector->base.dev);
>  	int i, num_bpc;
>  	u8 dsc_bpc[3] = {0};
>  	u8 dsc_max_bpc;
> @@ -1591,7 +1592,7 @@ int intel_dp_dsc_compute_max_bpp(struct intel_dp *intel_dp, u8 max_req_bpc)
>  
>  	dsc_max_bpc = min_t(u8, dsc_max_bpc, max_req_bpc);
>  
> -	num_bpc = drm_dp_dsc_sink_supported_input_bpcs(intel_dp->dsc_dpcd,
> +	num_bpc = drm_dp_dsc_sink_supported_input_bpcs(connector->dp.dsc_dpcd,
>  						       dsc_bpc);
>  	for (i = 0; i < num_bpc; i++) {
>  		if (dsc_max_bpc >= dsc_bpc[i])
> @@ -2056,6 +2057,8 @@ static int intel_edp_dsc_compute_pipe_bpp(struct intel_dp *intel_dp,
>  					  struct link_config_limits *limits)
>  {
>  	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> +	struct intel_connector *connector =
> +		to_intel_connector(conn_state->connector);
>  	int pipe_bpp, forced_bpp;
>  	int dsc_src_min_bpp, dsc_sink_min_bpp, dsc_min_bpp;
>  	int dsc_src_max_bpp, dsc_sink_max_bpp, dsc_max_bpp;
> @@ -2068,7 +2071,7 @@ static int intel_edp_dsc_compute_pipe_bpp(struct intel_dp *intel_dp,
>  		int max_bpc = min(limits->pipe.max_bpp / 3, (int)conn_state->max_requested_bpc);
>  
>  		/* For eDP use max bpp that can be supported with DSC. */
> -		pipe_bpp = intel_dp_dsc_compute_max_bpp(intel_dp, max_bpc);
> +		pipe_bpp = intel_dp_dsc_compute_max_bpp(connector, max_bpc);
>  		if (!is_dsc_pipe_bpp_sufficient(i915, conn_state, limits, pipe_bpp)) {
>  			drm_dbg_kms(&i915->drm,
>  				    "Computed BPC is not in DSC BPC limits\n");
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
> index bd9cb9680b4cd..af87aa2a5ed67 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.h
> +++ b/drivers/gpu/drm/i915/display/intel_dp.h
> @@ -116,7 +116,8 @@ void intel_read_dp_sdp(struct intel_encoder *encoder,
>  		       struct intel_crtc_state *crtc_state,
>  		       unsigned int type);
>  bool intel_digital_port_connected(struct intel_encoder *encoder);
> -int intel_dp_dsc_compute_max_bpp(struct intel_dp *intel_dp, u8 dsc_max_bpc);
> +int intel_dp_dsc_compute_max_bpp(const struct intel_connector *connector,
> +				 u8 dsc_max_bpc);
>  u16 intel_dp_dsc_get_max_compressed_bpp(struct drm_i915_private *i915,
>  					u32 link_clock, u32 lane_count,
>  					u32 mode_clock, u32 mode_hdisplay,
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> index e01f669d2c8a1..3ff429c30f300 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> @@ -1003,7 +1003,7 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
>  		 * TBD pass the connector BPC,
>  		 * for now U8_MAX so that max BPC on that platform would be picked
>  		 */
> -		int pipe_bpp = intel_dp_dsc_compute_max_bpp(intel_dp, U8_MAX);
> +		int pipe_bpp = intel_dp_dsc_compute_max_bpp(intel_connector, U8_MAX);
>  
>  		if (drm_dp_sink_supports_fec(intel_dp->fec_capable)) {
>  			dsc_max_compressed_bpp =
> -- 
> 2.39.2
>