[PATCH 04/22] drm/amd/display: Wait for mailbox ready when powering up DMCUB

[Tom Chung]

From: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>

[Why]
Otherwise we can send commands too early and they don't execute until
the next command is sent.

[How]
Check the extra status bit when polling for HW powered up.

Reviewed-by: Charlene Liu <charlene.liu at amd.com>
Acked-by: Tom Chung <chiahsuan.chung at amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
---
 drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c b/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
index 71eee58d86a1..569c2a27a042 100644
--- a/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
@@ -791,11 +791,20 @@ enum dmub_status dmub_srv_cmd_execute(struct dmub_srv *dmub)
 
 bool dmub_srv_is_hw_pwr_up(struct dmub_srv *dmub)
 {
+	union dmub_fw_boot_status status;
+
 	if (!dmub->hw_funcs.is_hw_powered_up)
 		return true;
 
-	return dmub->hw_funcs.is_hw_powered_up(dmub) &&
-		dmub->hw_funcs.is_hw_init(dmub);
+	if (!dmub->hw_funcs.is_hw_powered_up(dmub))
+		return false;
+
+	if (!dmub->hw_funcs.is_hw_init(dmub))
+		return false;
+
+	status = dmub->hw_funcs.get_fw_status(dmub);
+
+	return status.bits.dal_fw && status.bits.mailbox_rdy;
 }
 
 enum dmub_status dmub_srv_wait_for_hw_pwr_up(struct dmub_srv *dmub,
-- 
2.34.1