drm/amd/display: Include udelay when waiting for INBOX0 ACK

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

Cc: stable@vger.kernel.org # 6.1+
Reviewed-by: Samson Tam <samson.tam@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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 22fc4ba96defd1c0abd6e031d8a4f8cc07f7d4a9..38360adc53d973f83544751dfcd5e8ecfb459d21 100644 (file)
--- 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;
 }