Re: [PATCH v3 2/3] usb: xhci: This reworks ff8cbf250b448aac35589f6075082c3fcad8a8fe

[Lu, Baolu]

On 11/6/2014 5:24 AM, Alan Stern wrote:
> On Wed, 5 Nov 2014, Lu Baolu wrote:
>
> > xhci: clear root port wake on bits if controller isn't allowed to do wakeup
> >
> > When system is being suspended, if host device is not allowed to do wakeup,
> > xhci_suspend() needs to clear all root port wake on bits. Otherwise, some
> > platforms may generate spurious wakeup, even if PCI PME# is disabled.
> >
> > Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
> > Suggested-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> This looks pretty good now.
>
> > +static void xhci_disable_port_wake_on_bits(struct xhci_hcd *xhci)
> > +{
> > +	int port_index;
> > +	__le32 __iomem **port_array;
> > +	unsigned long flags;
> > +	u32 t1, t2;
> > +
> > +	spin_lock_irqsave(&xhci->lock, flags);
> > +
> > +	/* disble usb3 ports Wake bits*/
> > +	port_index = xhci->num_usb3_ports;
> > +	port_array = xhci->usb3_ports;
> > +	while (port_index--) {
> > +		t1 = readl(port_array[port_index]);
> > +		t2 = xhci_port_state_to_neutral(t1);
> > +		t2 &= ~PORT_WAKE_BITS;
> > +		t1 = xhci_port_state_to_neutral(t1);
> > +		if (t1 != t2)
> > +			writel(t2, port_array[port_index]);
> Why not just do:
>
> 		t1 = readl(port_array[port_index]);
> 		t1 = xhci_port_state_to_neutral(t1);
> 		t2 = t1 & ~PORT_WAKE_BITS;
> 		if (t1 != t2) ...
Right, this looks better. I will test and resend the patches with this 
change.

> Apart from that minor point,
>
> Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
>
> Alan Stern
>
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