Re: [Intel-gfx] [PATCH v7 15/15] drm/i915/display: Let PCON convert from RGB to YCbCr if it can

["Shankar, Uma" <uma.shankar@intel.com>]

> -----Original Message-----
> From: Nautiyal, Ankit K <ankit.k.nautiyal@intel.com>
> Sent: Friday, December 18, 2020 4:07 PM
> To: intel-gfx@lists.freedesktop.org
> Cc: dri-devel@lists.freedesktop.org; Shankar, Uma <uma.shankar@intel.com>;
> airlied@linux.ie; jani.nikula@linux.intel.com; ville.syrjala@linux.intel.com;
> Kulkarni, Vandita <vandita.kulkarni@intel.com>; Sharma, Swati2
> <swati2.sharma@intel.com>
> Subject: [PATCH v7 15/15] drm/i915/display: Let PCON convert from RGB to
> YCbCr if it can
> 
> If PCON has capability to convert RGB->YCbCr colorspace and also to 444->420
> downsampling then for any YUV420 only mode, we can let the PCON do all the
> conversion. If the PCON supports
> RGB->YCbCr conversion for all BT2020, BT709, BT601, choose
> the one that is selected by userspace via connector colorspace property,
> otherwise default to BT601.
> 
> v2: As suggested by Uma Shankar, considered case for colorspace
> BT709 and BT2020, and default to BT601. Also appended dir 'display' in commit
> message.
> 
> v3: Fixed typo in condition for printing one of the error msg.
> 
> v4: As suggested by Uma Shankar:
> -Fixed bug in determining the colorspace for RGB->YCbCr conversion.
> -Fixed minor formatting issues
> Also updated the commit message as per latest changes.

Changes look good, please work on color fixup as a separate series.
Reviewed-by: Uma Shankar <uma.shankar@intel.com>

> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_ddi.c      |  3 +-
>  .../drm/i915/display/intel_display_types.h    |  1 +
>  drivers/gpu/drm/i915/display/intel_dp.c       | 72 +++++++++++++++----
>  drivers/gpu/drm/i915/display/intel_dp.h       |  3 +-
>  4 files changed, 65 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c
> b/drivers/gpu/drm/i915/display/intel_ddi.c
> index fbc07a93504b..17eaa56c5a99 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -3644,6 +3644,7 @@ static void tgl_ddi_pre_enable_dp(struct
> intel_atomic_state *state,
>  	if (!is_mst)
>  		intel_dp_set_power(intel_dp, DP_SET_POWER_D0);
> 
> +	intel_dp_configure_protocol_converter(intel_dp, crtc_state);
>  	intel_dp_sink_set_decompression_state(intel_dp, crtc_state, true);
>  	/*
>  	 * DDI FEC: "anticipates enabling FEC encoding sets the FEC_READY bit
> @@ -3731,7 +3732,7 @@ static void hsw_ddi_pre_enable_dp(struct
> intel_atomic_state *state,
>  	intel_ddi_init_dp_buf_reg(encoder, crtc_state);
>  	if (!is_mst)
>  		intel_dp_set_power(intel_dp, DP_SET_POWER_D0);
> -	intel_dp_configure_protocol_converter(intel_dp);
> +	intel_dp_configure_protocol_converter(intel_dp, crtc_state);
>  	intel_dp_sink_set_decompression_state(intel_dp, crtc_state,
>  					      true);
>  	intel_dp_sink_set_fec_ready(intel_dp, crtc_state); diff --git
> a/drivers/gpu/drm/i915/display/intel_display_types.h
> b/drivers/gpu/drm/i915/display/intel_display_types.h
> index 4c01c7c23dfd..2009ae9e9678 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -1460,6 +1460,7 @@ struct intel_dp {
>  		int pcon_max_frl_bw;
>  		u8 max_bpc;
>  		bool ycbcr_444_to_420;
> +		bool rgb_to_ycbcr;
>  	} dfp;
> 
>  	/* Display stream compression testing */ diff --git
> a/drivers/gpu/drm/i915/display/intel_dp.c
> b/drivers/gpu/drm/i915/display/intel_dp.c
> index fdc028b7db07..d7e01482c808 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -651,6 +651,10 @@ intel_dp_output_format(struct drm_connector
> *connector,
>  	    !drm_mode_is_420_only(info, mode))
>  		return INTEL_OUTPUT_FORMAT_RGB;
> 
> +	if (intel_dp->dfp.rgb_to_ycbcr &&
> +	    intel_dp->dfp.ycbcr_444_to_420)
> +		return INTEL_OUTPUT_FORMAT_RGB;
> +
>  	if (intel_dp->dfp.ycbcr_444_to_420)
>  		return INTEL_OUTPUT_FORMAT_YCBCR444;
>  	else
> @@ -4319,7 +4323,8 @@ static void intel_dp_enable_port(struct intel_dp
> *intel_dp,
>  	intel_de_posting_read(dev_priv, intel_dp->output_reg);  }
> 
> -void intel_dp_configure_protocol_converter(struct intel_dp *intel_dp)
> +void intel_dp_configure_protocol_converter(struct intel_dp *intel_dp,
> +					   const struct intel_crtc_state *crtc_state)
>  {
>  	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
>  	u8 tmp;
> @@ -4348,12 +4353,42 @@ void intel_dp_configure_protocol_converter(struct
> intel_dp *intel_dp)
>  			    enableddisabled(intel_dp->dfp.ycbcr_444_to_420));
> 
>  	tmp = 0;
> +	if (intel_dp->dfp.rgb_to_ycbcr) {
> +		bool bt2020, bt709;
> 
> -	if (drm_dp_dpcd_writeb(&intel_dp->aux,
> -			       DP_PROTOCOL_CONVERTER_CONTROL_2, tmp) <= 0)
> +		/*
> +		 * FIXME: Currently if userspace selects BT2020 or BT709, but
> PCON supports only
> +		 * RGB->YCbCr for BT601 colorspace, we go ahead with BT601, as
> default.
> +		 *
> +		 */
> +		tmp = DP_CONVERSION_BT601_RGB_YCBCR_ENABLE;
> +
> +		bt2020 =
> drm_dp_downstream_rgb_to_ycbcr_conversion(intel_dp->dpcd,
> +								   intel_dp-
> >downstream_ports,
> +
> DP_DS_HDMI_BT2020_RGB_YCBCR_CONV);
> +		bt709 =
> drm_dp_downstream_rgb_to_ycbcr_conversion(intel_dp->dpcd,
> +								  intel_dp-
> >downstream_ports,
> +
> DP_DS_HDMI_BT709_RGB_YCBCR_CONV);
> +		switch (crtc_state->infoframes.vsc.colorimetry) {
> +		case DP_COLORIMETRY_BT2020_RGB:
> +		case DP_COLORIMETRY_BT2020_YCC:
> +			if (bt2020)
> +				tmp =
> DP_CONVERSION_BT2020_RGB_YCBCR_ENABLE;
> +			break;
> +		case DP_COLORIMETRY_BT709_YCC:
> +		case DP_COLORIMETRY_XVYCC_709:
> +			if (bt709)
> +				tmp =
> DP_CONVERSION_BT709_RGB_YCBCR_ENABLE;
> +			break;
> +		default:
> +			break;
> +		}
> +	}
> +
> +	if (drm_dp_pcon_convert_rgb_to_ycbcr(&intel_dp->aux, tmp) < 0)
>  		drm_dbg_kms(&i915->drm,
> -			    "Failed to set protocol converter YCbCr 4:2:2
> conversion mode to %s\n",
> -			    enableddisabled(false));
> +			   "Failed to set protocol converter RGB->YCbCr
> conversion mode to %s\n",
> +			   enableddisabled(tmp ? true : false));
>  }
> 
>  static void intel_enable_dp(struct intel_atomic_state *state, @@ -4393,7
> +4428,7 @@ static void intel_enable_dp(struct intel_atomic_state *state,
>  	}
> 
>  	intel_dp_set_power(intel_dp, DP_SET_POWER_D0);
> -	intel_dp_configure_protocol_converter(intel_dp);
> +	intel_dp_configure_protocol_converter(intel_dp, pipe_config);
>  	intel_dp_check_frl_training(intel_dp);
>  	intel_dp_pcon_dsc_configure(intel_dp, pipe_config);
>  	intel_dp_start_link_train(intel_dp, pipe_config); @@ -6861,7 +6896,7
> @@ intel_dp_update_420(struct intel_dp *intel_dp)  {
>  	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
>  	struct intel_connector *connector = intel_dp->attached_connector;
> -	bool is_branch, ycbcr_420_passthrough, ycbcr_444_to_420;
> +	bool is_branch, ycbcr_420_passthrough, ycbcr_444_to_420, rgb_to_ycbcr;
> 
>  	/* No YCbCr output support on gmch platforms */
>  	if (HAS_GMCH(i915))
> @@ -6883,14 +6918,26 @@ intel_dp_update_420(struct intel_dp *intel_dp)
>  		dp_to_dig_port(intel_dp)->lspcon.active ||
>  		drm_dp_downstream_444_to_420_conversion(intel_dp->dpcd,
>  							intel_dp-
> >downstream_ports);
> +	rgb_to_ycbcr = drm_dp_downstream_rgb_to_ycbcr_conversion(intel_dp-
> >dpcd,
> +							intel_dp-
> >downstream_ports,
> +
> 	DP_DS_HDMI_BT601_RGB_YCBCR_CONV ||
> +
> 	DP_DS_HDMI_BT709_RGB_YCBCR_CONV ||
> +
> 	DP_DS_HDMI_BT2020_RGB_YCBCR_CONV);
> 
>  	if (INTEL_GEN(i915) >= 11) {
> +		/* Let PCON convert from RGB->YCbCr if possible */
> +		if (is_branch && rgb_to_ycbcr && ycbcr_444_to_420) {
> +			intel_dp->dfp.rgb_to_ycbcr = true;
> +			intel_dp->dfp.ycbcr_444_to_420 = true;
> +			connector->base.ycbcr_420_allowed = true;
> +		} else {
>  		/* Prefer 4:2:0 passthrough over 4:4:4->4:2:0 conversion */
> -		intel_dp->dfp.ycbcr_444_to_420 =
> -			ycbcr_444_to_420 && !ycbcr_420_passthrough;
> +			intel_dp->dfp.ycbcr_444_to_420 =
> +				ycbcr_444_to_420 && !ycbcr_420_passthrough;
> 
> -		connector->base.ycbcr_420_allowed =
> -			!is_branch || ycbcr_444_to_420 ||
> ycbcr_420_passthrough;
> +			connector->base.ycbcr_420_allowed =
> +				!is_branch || ycbcr_444_to_420 ||
> ycbcr_420_passthrough;
> +		}
>  	} else {
>  		/* 4:4:4->4:2:0 conversion is the only way */
>  		intel_dp->dfp.ycbcr_444_to_420 = ycbcr_444_to_420; @@ -
> 6899,8 +6946,9 @@ intel_dp_update_420(struct intel_dp *intel_dp)
>  	}
> 
>  	drm_dbg_kms(&i915->drm,
> -		    "[CONNECTOR:%d:%s] YCbCr 4:2:0 allowed? %s, YCbCr 4:4:4-
> >4:2:0 conversion? %s\n",
> +		    "[CONNECTOR:%d:%s] RGB->YcbCr conversion? %s, YCbCr 4:2:0
> +allowed? %s, YCbCr 4:4:4->4:2:0 conversion? %s\n",
>  		    connector->base.base.id, connector->base.name,
> +		    yesno(intel_dp->dfp.rgb_to_ycbcr),
>  		    yesno(connector->base.ycbcr_420_allowed),
>  		    yesno(intel_dp->dfp.ycbcr_444_to_420));
>  }
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.h
> b/drivers/gpu/drm/i915/display/intel_dp.h
> index 1bfde4f89019..4280a09fd8fd 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.h
> +++ b/drivers/gpu/drm/i915/display/intel_dp.h
> @@ -51,7 +51,8 @@ int intel_dp_get_link_train_fallback_values(struct intel_dp
> *intel_dp,  int intel_dp_retrain_link(struct intel_encoder *encoder,
>  			  struct drm_modeset_acquire_ctx *ctx);  void
> intel_dp_set_power(struct intel_dp *intel_dp, u8 mode); -void
> intel_dp_configure_protocol_converter(struct intel_dp *intel_dp);
> +void intel_dp_configure_protocol_converter(struct intel_dp *intel_dp,
> +					   const struct intel_crtc_state
> *crtc_state);
>  void intel_dp_sink_set_decompression_state(struct intel_dp *intel_dp,
>  					   const struct intel_crtc_state *crtc_state,
>  					   bool enable);
> --
> 2.17.1

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx