Messages in this thread Patch in this message | | | Date | Mon, 21 Mar 2011 16:01:49 -0700 | From | Greg KH <> | Subject | [33/78] ehci: Check individual port status registers on resume |
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2.6.38-stable review patch. If anyone has any objections, please let us know.
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From: Matthew Garrett <mjg@redhat.com>
commit 294d95f2cbc2aef5346258f216cd9df570e271a5 upstream.
If a device plug/unplug is detected on an ATI SB700 USB controller in D3, it appears to set the port status register but not the controller status register. As a result we'll fail to detect the plug event. Check the port status register on resume as well in order to catch this case.
Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/usb/host/ehci-hub.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-)
--- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -106,6 +106,27 @@ static void ehci_handover_companion_port ehci->owned_ports = 0; } +static int ehci_port_change(struct ehci_hcd *ehci) +{ + int i = HCS_N_PORTS(ehci->hcs_params); + + /* First check if the controller indicates a change event */ + + if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD) + return 1; + + /* + * Not all controllers appear to update this while going from D3 to D0, + * so check the individual port status registers as well + */ + + while (i--) + if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC) + return 1; + + return 0; +} + static void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci, bool suspending, bool do_wakeup) { @@ -173,7 +194,7 @@ static void ehci_adjust_port_wakeup_flag } /* Does the root hub have a port wakeup pending? */ - if (!suspending && (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)) + if (!suspending && ehci_port_change(ehci)) usb_hcd_resume_root_hub(ehci_to_hcd(ehci)); spin_unlock_irqrestore(&ehci->lock, flags);
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