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

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Date:   Mon, 14 Aug 2023 07:47:33 +0000
From:   "Quan, Evan" <Evan.Quan@....com>
To:     Simon Horman <horms@...nel.org>
CC:     "rafael@...nel.org" <rafael@...nel.org>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
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        "Limonciello, Mario" <Mario.Limonciello@....com>,
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Subject: RE: [PATCH V8 6/9] drm/amd/pm: setup the framework to support Wifi
 RFI mitigation feature

[AMD Official Use Only - General]



> -----Original Message-----
> From: Simon Horman <horms@...nel.org>
> Sent: Friday, August 11, 2023 5:35 PM
> To: Quan, Evan <Evan.Quan@....com>
> Cc: rafael@...nel.org; lenb@...nel.org; Deucher, Alexander
> <Alexander.Deucher@....com>; Koenig, Christian
> <Christian.Koenig@....com>; Pan, Xinhui <Xinhui.Pan@....com>;
> airlied@...il.com; daniel@...ll.ch; johannes@...solutions.net;
> davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org;
> pabeni@...hat.com; Limonciello, Mario <Mario.Limonciello@....com>;
> mdaenzer@...hat.com; maarten.lankhorst@...ux.intel.com;
> tzimmermann@...e.de; hdegoede@...hat.com; jingyuwang_vip@....com;
> Lazar, Lijo <Lijo.Lazar@....com>; jim.cromie@...il.com;
> bellosilicio@...il.com; andrealmeid@...lia.com; trix@...hat.com;
> jsg@....id.au; arnd@...db.de; andrew@...n.ch; linux-
> kernel@...r.kernel.org; linux-acpi@...r.kernel.org; amd-
> gfx@...ts.freedesktop.org; dri-devel@...ts.freedesktop.org; linux-
> wireless@...r.kernel.org; netdev@...r.kernel.org
> 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@....com>
> > Reviewed-by: Mario Limonciello <mario.limonciello@....com>
> 
> ...
> 
> > +/**
> > + * 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;
> > +}
> 
> ...