drm/amd/display: Handle Y carry-over in VCP X.Y calculation

From George Shen
7be093e45215d4d9dfda515aebb7c31dc9413144 in linux-6.6.y/6.6.3
719564737a9ac3d0b49c314450b56cf6f7d71358 in mainline linux

diff --git a/sys/dev/pci/drm/amd/display/dc/dcn31/dcn31_hpo_dp_link_encoder.c b/sys/dev/pci/drm/amd/display/dc/dcn31/dcn31_hpo_dp_link_encoder.c
index 083a43c..fa8623c 100644 (file)
--- a/sys/dev/pci/drm/amd/display/dc/dcn31/dcn31_hpo_dp_link_encoder.c
+++ b/sys/dev/pci/drm/amd/display/dc/dcn31/dcn31_hpo_dp_link_encoder.c
@@ -395,6 +395,12 @@ void dcn31_hpo_dp_link_enc_set_throttled_vcp_size(
                                x),
                        25));
 
+       // If y rounds up to integer, carry it over to x.
+       if (y >> 25) {
+               x += 1;
+               y = 0;
+       }
+
        switch (stream_encoder_inst) {
        case 0:
                REG_SET_2(DP_DPHY_SYM32_VC_RATE_CNTL0, 0,