During reboot test on arm64 platform, it may failure on boot, so add this mb in smc. The error message are as follows: [ 6.996395][ 7] [ T295] [drm:amdgpu_device_ip_late_init [amdgpu]] *ERROR* late_init of IP block <si_dpm> failed -22 [ 7.006919][ 7] [ T295] amdgpu 0000:04:00.0: amdgpu_device_ip_late_init failed [ 7.014224][ 7] [ T295] amdgpu 0000:04:00.0: Fatal error during GPU init Signed-off-by: Zhenneng Li <lizhenneng@xxxxxxxxxx> --- drivers/gpu/drm/amd/pm/legacy-dpm/si_smc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/amd/pm/legacy-dpm/si_smc.c b/drivers/gpu/drm/amd/pm/legacy-dpm/si_smc.c index 8f994ffa9cd1..c7656f22278d 100644 --- a/drivers/gpu/drm/amd/pm/legacy-dpm/si_smc.c +++ b/drivers/gpu/drm/amd/pm/legacy-dpm/si_smc.c @@ -155,6 +155,8 @@ bool amdgpu_si_is_smc_running(struct amdgpu_device *adev) u32 rst = RREG32_SMC(SMC_SYSCON_RESET_CNTL); u32 clk = RREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0); + mb(); + if (!(rst & RST_REG) && !(clk & CK_DISABLE)) return true; -- 2.25.1
