[SRU][Q][PATCH 4/9] drm/i915/dp_mst: Reuse the DP-SST helper function to compute FEC config

[AceLan Kao]

From: Imre Deak <imre.deak at intel.com>

BugLink: https://bugs.launchpad.net/bugs/2131066

Reuse the DP-SST helper to compute the state for the FEC enabled state
for DP-MST as well.

Signed-off-by: Imre Deak <imre.deak at intel.com>
Reviewed-by: Jouni Högander <jouni.hogander at intel.com>
Link: https://lore.kernel.org/r/20251015161934.262108-5-imre.deak@intel.com
(cherry picked from commit b762ae48293e2cc2145cdc91eb596d057f1aff11)
Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao at canonical.com>
---
 drivers/gpu/drm/i915/display/intel_dp_mst.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 7db28f2dd996a..d27f836f1fb23 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -298,12 +298,10 @@ int intel_dp_mtp_tu_compute_config(struct intel_dp *intel_dp,
 	 * after it was set by intel_dp_dsc_compute_config() ->
 	 * intel_dp_needs_8b10b_fec().
 	 */
-	if (dsc) {
-		if (!intel_dp_supports_fec(intel_dp, connector, crtc_state))
-			return -EINVAL;
-
-		crtc_state->fec_enable = !intel_dp_is_uhbr(crtc_state);
-	}
+	crtc_state->fec_enable = intel_dp_needs_8b10b_fec(crtc_state, dsc);
+	if (crtc_state->fec_enable &&
+	    !intel_dp_supports_fec(intel_dp, connector, crtc_state))
+		return -EINVAL;
 
 	max_dpt_bpp_x16 = fxp_q4_from_int(intel_dp_mst_max_dpt_bpp(crtc_state, dsc));
 	if (max_dpt_bpp_x16 && max_bpp_x16 > max_dpt_bpp_x16) {
-- 
2.43.0