drm/amd/display: Use DTBCLK as refclk instead of DPREFCLK

From Austin Zheng
506d2ee72af2ffc4173537eb001d7d4d57781ec7 in linux-6.1.y/6.1.55
4a30cc2bd281fa176a68b5305cd3695d636152ad in mainline linux

diff --git a/sys/dev/pci/drm/amd/display/dc/dcn32/dcn32_dccg.c b/sys/dev/pci/drm/amd/display/dc/dcn32/dcn32_dccg.c
index ffbb739..8496ff4 100644 (file)
--- a/sys/dev/pci/drm/amd/display/dc/dcn32/dcn32_dccg.c
+++ b/sys/dev/pci/drm/amd/display/dc/dcn32/dcn32_dccg.c
@@ -290,7 +290,8 @@ static void dccg32_set_dpstreamclk(
        struct dcn_dccg *dccg_dcn = TO_DCN_DCCG(dccg);
 
        /* set the dtbclk_p source */
-       dccg32_set_dtbclk_p_src(dccg, src, otg_inst);
+       /* always program refclk as DTBCLK. No use-case expected to require DPREFCLK as refclk */
+       dccg32_set_dtbclk_p_src(dccg, DTBCLK0, otg_inst);
 
        /* enabled to select one of the DTBCLKs for pipe */
        switch (dp_hpo_inst) {