[PATCH 10/20] drm/amd/display: Insert pulling smu busy status before sending another request

[Pavle Kotarac]

From: Oliver Logush <oliver.log...@amd.com>

[why]
Make sure smu is not busy before sending another request, this is to
prevent stress failures from MS.

[how]
Check to make sure the SMU fw busy signal is cleared before sending
another request

Reviewed-by: Charlene Liu <charlene....@amd.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlaus...@amd.com>
Acked-by: Pavle Kotarac <pavle.kota...@amd.com>
Signed-off-by: Oliver Logush <oliver.log...@amd.com>
---
 .../drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr_vbios_smu.c    | 3 +++
 1 file changed, 3 insertions(+)

diff --git 
a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr_vbios_smu.c 
b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr_vbios_smu.c
index 8161a6ae410d..30c6f9cd717f 100644
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr_vbios_smu.c
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr_vbios_smu.c
@@ -94,6 +94,9 @@ static int rn_vbios_smu_send_msg_with_param(struct 
clk_mgr_internal *clk_mgr,
 {
        uint32_t result;
 
+       result = rn_smu_wait_for_response(clk_mgr, 10, 200000);
+       ASSERT(result == VBIOSSMC_Result_OK);
+
        /* First clear response register */
        REG_WRITE(MP1_SMN_C2PMSG_91, VBIOSSMC_Status_BUSY);
 
-- 
2.32.0