RE: [PATCH V8 6/9] drm/amd/pm: setup the framework to support Wifi RFI mitigation feature

[Quan, Evan]

[AMD Official Use Only - General]



> -----Original Message-----
> From: Simon Horman <horms@xxxxxxxxxx>
> Sent: Friday, August 11, 2023 5:35 PM
> To: Quan, Evan <Evan.Quan@xxxxxxx>
> Cc: rafael@xxxxxxxxxx; lenb@xxxxxxxxxx; Deucher, Alexander
> <Alexander.Deucher@xxxxxxx>; Koenig, Christian
> <Christian.Koenig@xxxxxxx>; Pan, Xinhui <Xinhui.Pan@xxxxxxx>;
> airlied@xxxxxxxxx; daniel@xxxxxxxx; johannes@xxxxxxxxxxxxxxxx;
> davem@xxxxxxxxxxxxx; edumazet@xxxxxxxxxx; kuba@xxxxxxxxxx;
> pabeni@xxxxxxxxxx; Limonciello, Mario <Mario.Limonciello@xxxxxxx>;
> mdaenzer@xxxxxxxxxx; maarten.lankhorst@xxxxxxxxxxxxxxx;
> tzimmermann@xxxxxxx; hdegoede@xxxxxxxxxx; jingyuwang_vip@xxxxxxx;
> Lazar, Lijo <Lijo.Lazar@xxxxxxx>; jim.cromie@xxxxxxxxx;
> bellosilicio@xxxxxxxxx; andrealmeid@xxxxxxxxxx; trix@xxxxxxxxxx;
> jsg@xxxxxxxxx; arnd@xxxxxxxx; andrew@xxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; linux-acpi@xxxxxxxxxxxxxxx; amd-
> gfx@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx; linux-
> wireless@xxxxxxxxxxxxxxx; netdev@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH V8 6/9] drm/amd/pm: setup the framework to support
> Wifi RFI mitigation feature
> 
> On Thu, Aug 10, 2023 at 03:38:00PM +0800, Evan Quan wrote:
> > With WBRF feature supported, as a driver responding to the frequencies,
> > amdgpu driver is able to do shadow pstate switching to mitigate possible
> > interference(between its (G-)DDR memory clocks and local radio module
> > frequency bands used by Wifi 6/6e/7).
> >
> > Signed-off-by: Evan Quan <evan.quan@xxxxxxx>
> > Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx>
> 
> ...
> 
> > +/**
> > + * smu_wbrf_event_handler - handle notify events
> > + *
> > + * @nb: notifier block
> > + * @action: event type
> > + * @data: event data
> 
> Hi Evan,
> 
> a minor nit from my side: although it is documented here,
> smu_wbrf_event_handler has no @data parameter, while
> it does have an undocumented _arg parameter.
Thanks for pointing this out. I will fix this.

Evan
> 
> > + *
> > + * Calls relevant amdgpu function in response to wbrf event
> > + * notification from kernel.
> > + */
> > +static int smu_wbrf_event_handler(struct notifier_block *nb,
> > +				  unsigned long action, void *_arg)
> > +{
> > +	struct smu_context *smu = container_of(nb, struct smu_context,
> > +					       wbrf_notifier);
> > +
> > +	switch (action) {
> > +	case WBRF_CHANGED:
> > +		smu_wbrf_handle_exclusion_ranges(smu);
> > +		break;
> > +	default:
> > +		return NOTIFY_DONE;
> > +	};
> > +
> > +	return NOTIFY_OK;
> > +}
> 
> ...