[PATCH 39/50] drm/amd/display: add dmcub support check

[Fangzhi Zuo]

From: Fudongwang <fudong.wang at amd.com>

[Why & How]
For DCN harvest case, if there is no dmcub support, we should return false
to avoid bugcheck later.

Reviewed-by: Aric Cyr <aric.cyr at amd.com>
Signed-off-by: Jerry Zuo <jerry.zuo at amd.com>
Signed-off-by: Fudongwang <fudong.wang at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 9897e322e2d5..f07b13ad4ead 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -5574,6 +5574,9 @@ void dc_mclk_switch_using_fw_based_vblank_stretch_shut_down(struct dc *dc)
  */
 bool dc_is_dmub_outbox_supported(struct dc *dc)
 {
+	if (!dc->caps.dmcub_support)
+		return false;
+
 	switch (dc->ctx->asic_id.chip_family) {
 
 	case FAMILY_YELLOW_CARP:
-- 
2.34.1