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drm/i915/dp: Add helper to get min sdp guardband

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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.

v2: Correct the lines required for PPS SDP. (Jouni)

Bspec: 70151
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://lore.kernel.org/r/20251017123504.2247954-3-ankit.k.nautiyal@intel.com
This commit is contained in:
Ankit Nautiyal
2025-10-17 18:05:01 +05:30
parent 77fb33cb7c
commit 52ecd48b8d
2 changed files with 38 additions and 0 deletions
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36
drivers/gpu/drm/i915/display/intel_dp.c
View File

@@ -7002,3 +7002,39 @@ 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 7;
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;
}

2
drivers/gpu/drm/i915/display/intel_dp.h
View File

@@ -223,5 +223,7 @@ 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__ */