Re: [PATCH] usb: host: xhci-plat: Iterate over parent nodes for finding quirks

[Mathias Nyman]

Hi,

Back from vacation

On 20.07.2018 18:39, Anurag Kumar Vulisha wrote:
> Hi Mathias,
>
> Thanks for providing your comments, please find my comments inline
>
> > > -	if (device_property_read_bool(sysdev, "usb2-lpm-disable"))
> > > -		xhci->quirks |= XHCI_HW_LPM_DISABLE;
> > > +	/* Iterate over all parent nodes for finding quirks */
> > > +	for (tmpdev = &pdev->dev; tmpdev; tmpdev = tmpdev->parent) {
> >
> > Isn't sysdev at this point the topmost device that can have any of those device
> > properties set?
> > We could loop from &pdev->dev up to and including sysdev.
> >
> > It doesn't matter much but maybe avoid walking some extra parents.
> > >
> I have seen some drivers ( like dwc3 host.c) which create a child dev, which is
> the pdev that is being passed to xhci_plat_probe(). So, sysdev may not be the
> topmost parent. There could be some properties which may be present in parent
> and may not be populated in the child. So, I made this change to search on all
> available parents for finding a valid property

Ok, lets keep it like you wrote it

> > > -	if (device_property_read_bool(sysdev, "usb3-lpm-capable"))
> > > -		xhci->quirks |= XHCI_LPM_SUPPORT;
> > > +		if (device_property_read_bool(tmpdev, "usb2-lpm-disable"))
> > > +			xhci->quirks |= XHCI_HW_LPM_DISABLE;
> > >
> > > -	if (device_property_read_bool(&pdev->dev, "quirk-broken-port-ped"))
> > > -		xhci->quirks |= XHCI_BROKEN_PORT_PED;
> > > +		if (device_property_read_bool(tmpdev, "usb3-lpm-capable"))
> > > +			xhci->quirks |= XHCI_LPM_SUPPORT;
> > >
> > > -	/* imod_interval is the interrupt moderation value in nanoseconds. */
> > > -	xhci->imod_interval = 40000;
> >
> > Setting the default imod_interval could be moved before the for() loop
>
> I thought it would be better if everything related to imod_interval is in one place,
> so kept it as is. I can fix this in v2 if you suggest.

Default imod_interval needs to be set before the for loop to avoid overwriting a value
got from device property

So a v2 is needed

-Mathias