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

On 10/31/2014 10:28 PM, Alan Stern wrote:
> On Fri, 31 Oct 2014, Lu Baolu wrote:
>
>> xhci: clear root port wake on bits if controller isn't wake-up capable
>>
>> When xHCI PCI host is suspended, if do_wakeup is false in xhci_pci_suspend,
>> xhci_pci_suspend needs to clear all root port wake on bits. Otherwise some Intel
>> platforms may get a spurious wakeup, even if PCI PME# is disabled.
>>
>> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
>> ---
>> drivers/usb/host/xhci-pci.c | 42 ++++++++++++++++++++++++++++++++++++++++++
>> drivers/usb/host/xhci.h | 6 ++++++
>> 2 files changed, 48 insertions(+)
>>
>> diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
>> index 280dde9..3e7441a 100644
>> --- a/drivers/usb/host/xhci-pci.c
>> +++ b/drivers/usb/host/xhci-pci.c
>> @@ -27,6 +27,8 @@
>> #include "xhci.h"
>> #include "xhci-trace.h"
>>
>> +#define PORT_WAKE_BITS (PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E)
>> +
>> /* Device for a quirk */
>> #define PCI_VENDOR_ID_FRESCO_LOGIC 0x1b73
>> #define PCI_DEVICE_ID_FRESCO_LOGIC_PDK 0x1000
>> @@ -126,6 +128,7 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
>> */
>> xhci->quirks |= XHCI_SPURIOUS_REBOOT;
>> xhci->quirks |= XHCI_AVOID_BEI;
>> + xhci->quirks |= XHCI_DISABLE_PORT_WOB;
>> }
>> if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
>> (pdev->device == PCI_DEVICE_ID_INTEL_LYNXPOINT_XHCI ||
>> @@ -279,6 +282,42 @@ static void xhci_pci_remove(struct pci_dev *dev)
>> }
>>
>> #ifdef CONFIG_PM
>> +static void xhci_disable_port_wake_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]);
>> + }
>> +
>> + /* disble usb2 ports Wake bits*/
>> + port_index = xhci->num_usb2_ports;
>> + port_array = xhci->usb2_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]);
>> + }
>> +
>> + spin_unlock_irqrestore(&xhci->lock, flags);
>> +}
>> +
>> static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
>> {
>> struct xhci_hcd *xhci = hcd_to_xhci(hcd);
>> @@ -291,6 +330,9 @@ static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
>> if (xhci->quirks & XHCI_COMP_MODE_QUIRK)
>> pdev->no_d3cold = true;
>>
>> + if (xhci->quirks & XHCI_DISABLE_PORT_WOB && !do_wakeup)
>> + xhci_disable_port_wake_bits(xhci);
>> +
>> return xhci_suspend(xhci);
>> }
> There are two things wrong here. First, this should not be a quirk.
> The Wake-On bits should be disabled whenever they aren't needed, on
> every controller.
>
> Second, this code (or something like it) belongs in xhci.c or
> xhci-hub.c, not xhci-pci.c. This is because it should apply to all
> xHCI controllers, not just the PCI-based ones.
Hi Alan,

I agree with you. I will resubmit my patches.

BR,
baolu

>
> (In fact, instead of disabling the Wake-On bits when the controller is
> suspended and do_wakeup is 0, it probably would be better to leave them
> disabled normally and then _enable_ them if do_wakeup is 1.)
>
> Alan Stern
>



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