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.
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 | 36 +++++++++++++++++++++++++ drivers/gpu/drm/i915/display/intel_dp.h | 2 ++ 2 files changed, 38 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 7059d55687cf..3f2c319e3d6f 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -6990,3 +6990,39 @@ int intel_dp_compute_config_late(struct intel_encoder *encoder, return 0; } + +static +int intel_dp_get_lines_for_sdp(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_sdp_min_guardband(const struct intel_crtc_state *crtc_state, + bool assume_all_enabled) +{ + int sdp_guardband = 0; + + if (assume_all_enabled || + crtc_state->infoframes.enable & + intel_hdmi_infoframe_enable(HDMI_PACKET_TYPE_GAMUT_METADATA)) + sdp_guardband = max(sdp_guardband, + intel_dp_get_lines_for_sdp(HDMI_PACKET_TYPE_GAMUT_METADATA)); + + if (assume_all_enabled || + crtc_state->dsc.compression_enable) + sdp_guardband = max(sdp_guardband, intel_dp_get_lines_for_sdp(DP_SDP_PPS)); + + return sdp_guardband; +} diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h index 281ced3a3b39..7ee5aeb28fe2 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.h +++ b/drivers/gpu/drm/i915/display/intel_dp.h @@ -221,5 +221,7 @@ bool intel_dp_in_hdr_mode(const struct drm_connector_state *conn_state); int intel_dp_compute_config_late(struct intel_encoder *encoder, struct intel_crtc_state *crtc_state, struct drm_connector_state *conn_state); +int intel_dp_sdp_min_guardband(const struct intel_crtc_state *crtc_state, + bool assume_all_enabled); #endif /* __INTEL_DP_H__ */ -- 2.45.2
