drm/amd/display: flicking observed while installing driver on Navi10 CF

[WHY] value of dchub_ref_clock is decided by dchubbub global timer
settings which is programmed by vbios command table disp_init.
for multi-GPU case, vbios is posted only for primary GPU. without
vbios posted for the secondary GPU, value of dchub_ref_clock is not
set properly. this value will affect dcn bandwidth calcuation and
cause underflow. user will see screen flicking during driver
installation for dual GPU case.

[HOW] dc init_hw always call vbios command table disp_init to
make sure dchubbub global timer is configured and enable.
Signed-off-by: hersen wu <hersenxs.wu@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -172,6 +172,7 @@ struct resource_pool *dc_create_resource_pool(struct dc  *dc,
 	default:
 		break;
 	}
+
 	if (res_pool != NULL) {
 		if (dc->ctx->dc_bios->fw_info_valid) {
 			res_pool->ref_clocks.xtalin_clock_inKhz =

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

@@ -1209,7 +1209,9 @@ static void dcn10_init_hw(struct dc *dc)
 		return;
 	}
 
-	if (!dcb->funcs->is_accelerated_mode(dcb)) {
+	if (!dcb->funcs->is_accelerated_mode(dcb))
+		dc->hwss.disable_vga(dc->hwseq);
+
 	dc->hwss.bios_golden_init(dc);
 	if (dc->ctx->dc_bios->fw_info_valid) {
 		res_pool->ref_clocks.xtalin_clock_inKhz =
@@ -1235,8 +1237,6 @@ static void dcn10_init_hw(struct dc *dc)
 		}
 	} else
 		ASSERT_CRITICAL(false);
-		dc->hwss.disable_vga(dc->hwseq);
-	}
 
 	for (i = 0; i < dc->link_count; i++) {
 		/* Power up AND update implementation according to the