[PATCH 08/19] drm/i915/dp: Add a helper to decide if AS SDP can be used

Ankit Nautiyal
2026-03-30T04:22:26Z

Add a helper that determines whether AS SDP can be used for the
current DP configuration. For now this is true only when the sink
supports AS SDP and VRR is enabled, but more conditions may be added
later.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
---
drivers/gpu/drm/i915/display/intel_dp.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 499850c2abcf..7ca3f9d583db 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -3124,6 +3124,15 @@ static void intel_dp_compute_vsc_colorimetry(const struct intel_crtc_state *crtc
vsc->content_type = DP_CONTENT_TYPE_NOT_DEFINED;
}

+static bool intel_dp_can_use_as_sdp(struct intel_dp *intel_dp,
+ struct intel_crtc_state *crtc_state)
+{
+ if (!intel_dp->as_sdp_supported)
+ return false;
+
+ return crtc_state->vrr.enable;
+}
+
static void intel_dp_compute_as_sdp(struct intel_dp *intel_dp,
struct intel_crtc_state *crtc_state)
{
@@ -3131,7 +3140,7 @@ static void intel_dp_compute_as_sdp(struct intel_dp *intel_dp,
const struct drm_display_mode *adjusted_mode =
&crtc_state->hw.adjusted_mode;

- if (!crtc_state->vrr.enable || !intel_dp->as_sdp_supported)
+ if (!intel_dp_can_use_as_sdp(intel_dp, crtc_state))
return;

crtc_state->infoframes.enable |= intel_hdmi_infoframe_enable(DP_SDP_ADAPTIVE_SYNC);
--
2.45.2