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

Quan, Evan
2023-08-14T07:48:33Z

[AMD Official Use Only - General]

> -----Original Message-----
> From: Simon Horman <horms@kernel.org>
> Sent: Friday, August 11, 2023 5:35 PM
> To: Quan, Evan <Evan.Quan@amd.com>
> Cc: rafael@kernel.org; lenb@kernel.org; Deucher, Alexander
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> 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@amd.com>
> > Reviewed-by: Mario Limonciello <mario.limonciello@amd.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;
> > +}
>
> ...