drm/i915/dp: Add compute routine for DP VSC SDP

In order to support state readout for DP VSC SDP, we need to have a
structure which holds DP VSC SDP payload data such as
"union hdmi_infoframe drm" which is used for DRM infoframe.
It adds a struct drm_dp_vsc_sdp vsc to intel_crtc_state.infoframes.

And it stores computed dp vsc sdp to infoframes.vsc of crtc state.
While computing we'll also fill out the inforames.enable bitmask
appropriately.

The compute routine follows DP 1.4 spec [Table 2-117: VSC SDP Payload for
DB16 through DB18].

v3: Replace a structure name to drm_dp_vsc_sdp from intel_dp_vsc_sdp
v5:
  - Rebased
  - Add warning where a bpc is 6 and a pixel format is RGB.
v7: Fix the wrong check of combination bpc 6 and RGB pixelformat

Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200211074657.231405-3-gwan-gyeong.mun@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 5e00e61..7de4249 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1015,6 +1015,7 @@ struct intel_crtc_state {
                union hdmi_infoframe spd;
                union hdmi_infoframe hdmi;
                union hdmi_infoframe drm;
+               struct drm_dp_vsc_sdp vsc;
        } infoframes;
 
        /* HDMI scrambling status */

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index ef2e06e..0af09ed 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2395,6 +2395,105 @@ static bool intel_dp_port_has_audio(struct drm_i915_private *dev_priv,
        return true;
 }
 
+static void intel_dp_compute_vsc_colorimetry(const struct intel_crtc_state *crtc_state,
+                                            const struct drm_connector_state *conn_state,
+                                            struct drm_dp_vsc_sdp *vsc)
+{
+       struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+       struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+
+       /*
+        * Prepare VSC Header for SU as per DP 1.4 spec, Table 2-118
+        * VSC SDP supporting 3D stereo, PSR2, and Pixel Encoding/
+        * Colorimetry Format indication.
+        */
+       vsc->revision = 0x5;
+       vsc->length = 0x13;
+
+       /* DP 1.4a spec, Table 2-120 */
+       switch (crtc_state->output_format) {
+       case INTEL_OUTPUT_FORMAT_YCBCR444:
+               vsc->pixelformat = DP_PIXELFORMAT_YUV444;
+               break;
+       case INTEL_OUTPUT_FORMAT_YCBCR420:
+               vsc->pixelformat = DP_PIXELFORMAT_YUV420;
+               break;
+       case INTEL_OUTPUT_FORMAT_RGB:
+       default:
+               vsc->pixelformat = DP_PIXELFORMAT_RGB;
+       }
+
+       switch (conn_state->colorspace) {
+       case DRM_MODE_COLORIMETRY_BT709_YCC:
+               vsc->colorimetry = DP_COLORIMETRY_BT709_YCC;
+               break;
+       case DRM_MODE_COLORIMETRY_XVYCC_601:
+               vsc->colorimetry = DP_COLORIMETRY_XVYCC_601;
+               break;
+       case DRM_MODE_COLORIMETRY_XVYCC_709:
+               vsc->colorimetry = DP_COLORIMETRY_XVYCC_709;
+               break;
+       case DRM_MODE_COLORIMETRY_SYCC_601:
+               vsc->colorimetry = DP_COLORIMETRY_SYCC_601;
+               break;
+       case DRM_MODE_COLORIMETRY_OPYCC_601:
+               vsc->colorimetry = DP_COLORIMETRY_OPYCC_601;
+               break;
+       case DRM_MODE_COLORIMETRY_BT2020_CYCC:
+               vsc->colorimetry = DP_COLORIMETRY_BT2020_CYCC;
+               break;
+       case DRM_MODE_COLORIMETRY_BT2020_RGB:
+               vsc->colorimetry = DP_COLORIMETRY_BT2020_RGB;
+               break;
+       case DRM_MODE_COLORIMETRY_BT2020_YCC:
+               vsc->colorimetry = DP_COLORIMETRY_BT2020_YCC;
+               break;
+       case DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65:
+       case DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER:
+               vsc->colorimetry = DP_COLORIMETRY_DCI_P3_RGB;
+               break;
+       default:
+               /*
+                * RGB->YCBCR color conversion uses the BT.709
+                * color space.
+                */
+               if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
+                       vsc->colorimetry = DP_COLORIMETRY_BT709_YCC;
+               else
+                       vsc->colorimetry = DP_COLORIMETRY_DEFAULT;
+               break;
+       }
+
+       vsc->bpc = crtc_state->pipe_bpp / 3;
+
+       /* only RGB pixelformat supports 6 bpc */
+       drm_WARN_ON(&dev_priv->drm,
+                   vsc->bpc == 6 && vsc->pixelformat != DP_PIXELFORMAT_RGB);
+
+       /* all YCbCr are always limited range */
+       vsc->dynamic_range = DP_DYNAMIC_RANGE_CTA;
+       vsc->content_type = DP_CONTENT_TYPE_NOT_DEFINED;
+}
+
+static void intel_dp_compute_vsc_sdp(struct intel_dp *intel_dp,
+                                    struct intel_crtc_state *crtc_state,
+                                    const struct drm_connector_state *conn_state)
+{
+       struct drm_dp_vsc_sdp *vsc = &crtc_state->infoframes.vsc;
+
+       /* When PSR is enabled, VSC SDP is handled by PSR routine */
+       if (intel_psr_enabled(intel_dp))
+               return;
+
+       if (!intel_dp_needs_vsc_sdp(crtc_state, conn_state))
+               return;
+
+       crtc_state->infoframes.enable |= intel_hdmi_infoframe_enable(DP_SDP_VSC);
+       vsc->sdp_type = DP_SDP_VSC;
+       intel_dp_compute_vsc_colorimetry(crtc_state, conn_state,
+                                        &crtc_state->infoframes.vsc);
+}
+
 int
 intel_dp_compute_config(struct intel_encoder *encoder,
                        struct intel_crtc_state *pipe_config,
@@ -2500,6 +2599,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
                intel_dp_set_clock(encoder, pipe_config);
 
        intel_psr_compute_config(intel_dp, pipe_config);
+       intel_dp_compute_vsc_sdp(intel_dp, pipe_config, conn_state);
 
        return 0;
 }