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