On Fri, Aug 23, 2019 at 12:52:28PM +0300, Gwan-gyeong Mun wrote:
> When BT.2020 Colorimetry output is used for DP, we should program BT.2020
> Colorimetry to MSA and VSC SDP. It adds output_colorspace to
> intel_crtc_state struct as a place holder of pipe's output colorspace.
> In order to distinguish needed colorimetry for VSC SDP, it adds
> intel_dp_needs_vsc_colorimetry function.
> If the output colorspace requires vsc sdp or output format is YCbCr 4:2:0,
> it uses MSA with VSC SDP.
>
> As per DP 1.4a spec section 2.2.4.3 [MSA Field for Indication of
> Color Encoding Format and Content Color Gamut] while sending
> BT.2020 Colorimetry signals we should program MSA MISC1 fields which
> indicate VSC SDP for the Pixel Encoding/Colorimetry Format.
>
> v2: Remove useless parentheses
>
> Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_ddi.c | 8 +++---
> .../drm/i915/display/intel_display_types.h | 3 +++
> drivers/gpu/drm/i915/display/intel_dp.c | 25 ++++++++++++++++++-
> drivers/gpu/drm/i915/display/intel_dp.h | 1 +
> 4 files changed, 33 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index 4f7ea0a35976..5c42b58c1c2f 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -1737,11 +1737,13 @@ void intel_ddi_set_pipe_settings(const struct intel_crtc_state *crtc_state)
> /*
> * As per DP 1.4a spec section 2.2.4.3 [MSA Field for Indication
> * of Color Encoding Format and Content Color Gamut] while sending
> - * YCBCR 420 signals we should program MSA MISC1 fields which
> - * indicate VSC SDP for the Pixel Encoding/Colorimetry Format.
> + * YCBCR 420, HDR BT.2020 signals we should program MSA MISC1 fields
> + * which indicate VSC SDP for the Pixel Encoding/Colorimetry Format.
> */
> - if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
> + if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 ||
> + intel_dp_needs_vsc_colorimetry(crtc_state->output_colorspace))
> temp |= TRANS_MSA_USE_VSC_SDP;
> +
> I915_WRITE(TRANS_MSA_MISC(cpu_transcoder), temp);
> }
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> index 449abaea619f..9845abcf6f29 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -964,6 +964,9 @@ struct intel_crtc_state {
> /* Output format RGB/YCBCR etc */
> enum intel_output_format output_format;
>
> + /* Output colorspace sRGB/BT.2020 etc */
> + u32 output_colorspace;
> +
> /* Output down scaling is done in LSPCON device */
> bool lspcon_downsampling;
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 55d5ab97061c..295d5ed2be96 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -2164,6 +2164,8 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> pipe_config->has_pch_encoder = true;
>
> pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
> + pipe_config->output_colorspace = intel_conn_state->base.colorspace;
> +
> if (lspcon->active)
> lspcon_ycbcr420_config(&intel_connector->base, pipe_config);
> else
> @@ -4408,6 +4410,26 @@ u8 intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp,
> return 0;
> }
>
> +bool
> +intel_dp_needs_vsc_colorimetry(u32 colorspace)
I would pass the entire crtc state here so you handle handle the 4:2:0
case here as well.
> +{
> + bool ret = false;
Pointless variable.
> +
> + switch (colorspace) {
> + case DRM_MODE_COLORIMETRY_SYCC_601:
> + case DRM_MODE_COLORIMETRY_OPYCC_601:
> + case DRM_MODE_COLORIMETRY_BT2020_YCC:
> + case DRM_MODE_COLORIMETRY_BT2020_RGB:
> + case DRM_MODE_COLORIMETRY_BT2020_CYCC:
> + ret = true;
> + break;
> + default:
> + break;
> + }
> +
> + return ret;
> +}
> +
> static void
> intel_dp_setup_vsc_sdp(struct intel_dp *intel_dp,
> const struct intel_crtc_state *crtc_state,
> @@ -4536,7 +4558,8 @@ void intel_dp_vsc_enable(struct intel_dp *intel_dp,
> const struct intel_crtc_state *crtc_state,
> const struct drm_connector_state *conn_state)
> {
> - if (crtc_state->output_format != INTEL_OUTPUT_FORMAT_YCBCR420)
> + if (crtc_state->output_format != INTEL_OUTPUT_FORMAT_YCBCR420 &&
> + !intel_dp_needs_vsc_colorimetry(conn_state->colorspace))
> return;
>
> intel_dp_setup_vsc_sdp(intel_dp, crtc_state, conn_state);
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
> index 91a0ee6058fe..b2da7c9998f7 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.h
> +++ b/drivers/gpu/drm/i915/display/intel_dp.h
> @@ -111,6 +111,7 @@ bool intel_dp_read_dpcd(struct intel_dp *intel_dp);
> bool intel_dp_get_colorimetry_status(struct intel_dp *intel_dp);
> int intel_dp_link_required(int pixel_clock, int bpp);
> int intel_dp_max_data_rate(int max_link_clock, int max_lanes);
> +bool intel_dp_needs_vsc_colorimetry(u32 colorspace);
> void intel_dp_vsc_enable(struct intel_dp *intel_dp,
> const struct intel_crtc_state *crtc_state,
> const struct drm_connector_state *conn_state);
> --
> 2.22.0
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Ville Syrjälä
Intel
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