[Intel-gfx] [PATCH 1/2] drm/i915/psr: Equation changed for sending start/stop on prior line

[Jouni Högander]

Equation for sending start/end SDP prior to the SU region start/end
has changed. Update used formula.

Bspec: 49274

Cc: Mika Kahola <mika.kahola at intel.com>
Cc: José Roberto de Souza <jose.souza at intel.com>
Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 079b7d3d0c53..6f03bf16d6f4 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -805,8 +805,8 @@ static bool _compute_psr2_sdp_prior_scanline_indication(struct intel_dp *intel_d
 	hblank_total = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
 	hblank_ns = div_u64(1000000ULL * hblank_total, adjusted_mode->crtc_clock);
 
-	/* From spec: (72 / number of lanes) * 1000 / symbol clock frequency MHz */
-	req_ns = (72 / crtc_state->lane_count) * 1000 / (crtc_state->port_clock / 1000);
+	/* From spec: ((60 / number of lanes) + 11) * 1000 / symbol clock frequency MHz */
+	req_ns = ((60 / crtc_state->lane_count) + 11) * 1000 / (crtc_state->port_clock / 1000);
 
 	if ((hblank_ns - req_ns) > 100)
 		return true;
-- 
2.34.1