Currently the driver crashes if smu7_enable_dpm_tasks() returns early, which it does if DPM is already active. It seems to be better just to continue anyway, at least I haven't noticed any ill effects. It's also unclear at what state the hardware was left by the previous driver, so IMO it's better to always fully initialize. Way to reproduce: $ modprobe amdgpu $ rmmod amdgpu $ modprobe amdgpu ... DPM is already running right now, no need to enable DPM! ... failed to send message 18b ret is 0 BUG: unable to handle kernel paging request at ffffed01fc9ab21f Call Trace: smu7_set_power_state_tasks+0x499/0x1940 [amdgpu] phm_set_power_state+0xcb/0x120 [amdgpu] psm_adjust_power_state_dynamic+0x11e/0x1b0 [amdgpu] pem_task_adjust_power_state+0xb9/0xd0 [amdgpu] pem_excute_event_chain+0x7d/0xe0 [amdgpu] pem_handle_event_unlocked+0x49/0x60 [amdgpu] pem_handle_event+0xe/0x10 [amdgpu] pp_dpm_dispatch_tasks+0xe0/0x190 [amdgpu] amdgpu_pm_compute_clocks+0x10c/0xc60 [amdgpu] dce_v11_0_crtc_dpms+0x7d/0x150 [amdgpu] dce_v11_0_crtc_disable+0x90/0x4a0 [amdgpu] drm_helper_disable_unused_functions+0x67/0x80 [drm_kms_helper] amdgpu_fbdev_init+0x13e/0x170 [amdgpu] amdgpu_device_init+0x1aeb/0x2490 [amdgpu] Signed-off-by: Grazvydas Ignotas <notasas at gmail.com> --- drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c index f6afa6a..327030b 100644 --- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c @@ -1166,8 +1166,8 @@ static int smu7_enable_dpm_tasks(struct pp_hwmgr *hwmgr) tmp_result = (!smum_is_dpm_running(hwmgr)) ? 0 : -1; PP_ASSERT_WITH_CODE(tmp_result == 0, - "DPM is already running right now, no need to enable DPM!", - return 0); + "DPM is already running", + ); if (smu7_voltage_control(hwmgr)) { tmp_result = smu7_enable_voltage_control(hwmgr); -- 2.7.4