[PATCH 14/17] drm/i915/dp_mst: Fix PBN calculation with FEC overhead

[Imre Deak]

On 8b/10b MST links the PBN value for DSC streams must be calculated
accounting for the FEC overhead. The same applies to 8b/10b non-DSC
streams if there is another DSC stream on the same link. Fix up the PBN
calculation accordingly.

Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp_mst.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index b22e0cbdb7d56..4fe10d7256630 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -111,7 +111,8 @@ static int intel_dp_mst_find_vcpi_slots_for_bpp(struct intel_encoder *encoder,
 		crtc_state->pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock,
 						       dsc ? bpp << 4 : bpp,
 						       dsc,
-						       false);
+						       (dsc || crtc_state->fec_enable) &&
+							!intel_dp_is_uhbr(crtc_state));
 
 		slots = drm_dp_atomic_find_time_slots(state, &intel_dp->mst_mgr,
 						      connector->port,
-- 
2.37.2