Commit 69d640ed authored by Ankit Nautiyal's avatar Ankit Nautiyal
Browse files

drm/i915/dp: Check if guardband can accommodate sdp latencies 



Check if guardband is sufficient for all DP SDP latencies.
If its not, fail .compute_config_late().

Signed-off-by: default avatarAnkit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://lore.kernel.org/r/20251017123504.2247954-4-ankit.k.nautiyal@intel.com
parent 52ecd48b

drivers/gpu/drm/i915/display/intel_dp.c

+22 −0
Original line number Diff line number Diff line
@@ -93,6 +93,7 @@ 
#include "intel_psr.h"

#include "intel_quirks.h"

#include "intel_tc.h"

#include "intel_vblank.h"

#include "intel_vdsc.h"

#include "intel_vrr.h"
@@ -6992,14 +6993,35 @@ void intel_dp_mst_resume(struct intel_display *display) 
	}

}



static

int intel_dp_sdp_compute_config_late(struct intel_crtc_state *crtc_state)

{

	struct intel_display *display = to_intel_display(crtc_state);

	int guardband = intel_crtc_vblank_length(crtc_state);

	int min_sdp_guardband = intel_dp_sdp_min_guardband(crtc_state, false);



	if (guardband < min_sdp_guardband) {

		drm_dbg_kms(display->drm, "guardband %d < min sdp guardband %d\n",

			    guardband, min_sdp_guardband);

		return -EINVAL;

	}



	return 0;

}



int intel_dp_compute_config_late(struct intel_encoder *encoder,

				 struct intel_crtc_state *crtc_state,

				 struct drm_connector_state *conn_state)

{

	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

	int ret;



	intel_psr_compute_config_late(intel_dp, crtc_state);



	ret = intel_dp_sdp_compute_config_late(crtc_state);

	if (ret)

		return ret;



	return 0;

}