[PATCH] drm/amd/powerplay: don't give up if DPM is already running

[Edward O'Callaghan]

Reviewed-by: Edward O'Callaghan <funfunctor at folklore1984.net>

On 10/10/2016 06:23 AM, Grazvydas Ignotas wrote:
> 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);
> 

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