[PATCH 02/35] drm/amd/display: Include udelay when waiting for INBOX0 ACK

[Hamza Mahfooz]

From: Alvin Lee <alvin.lee2 at amd.com>

When waiting for the ACK for INBOX0 message,
we have to ensure to include the udelay
for proper wait time

Cc: stable at vger.kernel.org # 6.1+
Reviewed-by: Samson Tam <samson.tam at amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz at amd.com>
Signed-off-by: Alvin Lee <alvin.lee2 at amd.com>
---
 drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c | 1 +
 1 file changed, 1 insertion(+)

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 22fc4ba96def..38360adc53d9 100644
--- a/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
@@ -1077,6 +1077,7 @@ enum dmub_status dmub_srv_wait_for_inbox0_ack(struct dmub_srv *dmub, uint32_t ti
 		ack = dmub->hw_funcs.read_inbox0_ack_register(dmub);
 		if (ack)
 			return DMUB_STATUS_OK;
+		udelay(1);
 	}
 	return DMUB_STATUS_TIMEOUT;
 }
-- 
2.42.0