Add a helper to compute vblank time needed for transmitting specific DisplayPort SDPs like PPS, GAMUT_METADATA, and VSC_EXT. Latency is based on line count per packet type and current line time.
This will be used to ensure adequate guardband when features like DSC/HDR are enabled. Bspec: 70151 Signed-off-by: Ankit Nautiyal <[email protected]> --- drivers/gpu/drm/i915/display/intel_dp.c | 33 +++++++++++++++++++++++++ drivers/gpu/drm/i915/display/intel_dp.h | 1 + 2 files changed, 34 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index e481ff4c4959..54d31d02ba50 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -6988,3 +6988,36 @@ void intel_dp_compute_config_late(struct intel_encoder *encoder, intel_psr_compute_config_late(intel_dp, crtc_state); } + +static +int intel_dp_get_sdp_latency(u32 type) +{ + switch (type) { + case DP_SDP_VSC_EXT_VESA: + case DP_SDP_VSC_EXT_CEA: + return 10; + case HDMI_PACKET_TYPE_GAMUT_METADATA: + return 8; + case DP_SDP_PPS: + return 6; + default: + break; + } + + return 0; +} + +int intel_dp_compute_sdp_latency(const struct intel_crtc_state *crtc_state) +{ + int sdp_latency = 0; + + if (crtc_state->infoframes.enable & + intel_hdmi_infoframe_enable(HDMI_PACKET_TYPE_GAMUT_METADATA)) + sdp_latency = max(sdp_latency, + intel_dp_get_sdp_latency(HDMI_PACKET_TYPE_GAMUT_METADATA)); + + if (crtc_state->dsc.compression_enable) + sdp_latency = max(sdp_latency, intel_dp_get_sdp_latency(DP_SDP_PPS)); + + return sdp_latency; +} diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h index 0d9573ca44cb..27089cef86d8 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.h +++ b/drivers/gpu/drm/i915/display/intel_dp.h @@ -221,5 +221,6 @@ bool intel_dp_in_hdr_mode(const struct drm_connector_state *conn_state); void intel_dp_compute_config_late(struct intel_encoder *encoder, struct intel_crtc_state *crtc_state, struct drm_connector_state *conn_state); +int intel_dp_compute_sdp_latency(const struct intel_crtc_state *crtc_state); #endif /* __INTEL_DP_H__ */ -- 2.45.2
