drm/amd/display: Add FAMS validation before trying to use it

To ensure that FAMS can be used, DC must check if there is VRR support.
This commit adds the required configuration to ensure FAMS can be executed in the target system.
Reviewed-by: Alvin Lee <Alvin.Lee2@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -2604,6 +2604,12 @@ static enum surface_update_type check_update_surfaces_for_stream(
 
 		if (stream_update->mst_bw_update)
 			su_flags->bits.mst_bw = 1;
+
+		if (stream_update->stream && stream_update->stream->freesync_on_desktop &&
+			(stream_update->vrr_infopacket || stream_update->allow_freesync ||
+				stream_update->vrr_active_variable))
+			su_flags->bits.fams_changed = 1;
+
 		if (stream_update->crtc_timing_adjust && dc_extended_blank_supported(dc))
 			su_flags->bits.crtc_timing_adjust = 1;
 

drivers/gpu/drm/amd/display/dc/dc_stream.h

@@ -131,6 +131,7 @@ union stream_update_flags {
 		uint32_t dsc_changed : 1;
 		uint32_t mst_bw : 1;
 		uint32_t crtc_timing_adjust : 1;
+		uint32_t fams_changed : 1;
 	} bits;
 
 	uint32_t raw;

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.c

@@ -301,7 +301,12 @@ static void optc3_wait_drr_doublebuffer_pending_clear(struct timing_generator *o
 
 void optc3_set_vtotal_min_max(struct timing_generator *optc, int vtotal_min, int vtotal_max)
 {
-	optc1_set_vtotal_min_max(optc, vtotal_min, vtotal_max);
+	struct dc *dc = optc->ctx->dc;
+
+	if (dc->caps.dmub_caps.mclk_sw && !dc->debug.disable_fams)
+		dc_dmub_srv_drr_update_cmd(dc, optc->inst, vtotal_min, vtotal_max);
+	else
+		optc1_set_vtotal_min_max(optc, vtotal_min, vtotal_max);
 }
 
 void optc3_tg_init(struct timing_generator *optc)

drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h

@@ -360,7 +360,7 @@ union dmub_fw_boot_status {
 		uint32_t optimized_init_done : 1; /**< 1 if optimized init done */
 		uint32_t restore_required : 1; /**< 1 if driver should call restore */
 		uint32_t defer_load : 1; /**< 1 if VBIOS data is deferred programmed */
-		uint32_t reserved : 1;
+		uint32_t fams_enabled : 1; /**< 1 if VBIOS data is deferred programmed */
 		uint32_t detection_required: 1; /**<  if detection need to be triggered by driver */
 		uint32_t hw_power_init_done: 1; /**< 1 if hw power init is completed */
 	} bits; /**< status bits */