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| author | Alan Stern <stern@rowland.harvard.edu> | 2007-05-04 19:52:40 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-07-13 03:29:47 +0400 |
| commit | 383975d765523a56dc43a6cd6d52e9b376800cf2 (patch) | |
| tree | d6ecbfe620d7d5fba372211d7af185e7c44e5097 /drivers/usb/host/ehci-hcd.c | |
| parent | 0458d5b4c9cc4ca0f62625d0144ddc4b4bc97a3c (diff) | |
| download | linux-383975d765523a56dc43a6cd6d52e9b376800cf2.tar.xz | |
USB: EHCI, OHCI: handover changes
This patch (as887) changes the way ehci-hcd and ohci-hcd handle a loss
of VBUS power during suspend. In order for the USB-persist facility
to work correctly, it is necessary for low- and full-speed devices
attached to a high-speed port to be handed back to the companion
controller during resume processing.
This entails three changes: adding code to ehci-hcd to perform the
handover, removing code from ohci-hcd to turn off ports during
root-hub reinit, and adding code to ohci-hcd to turn on ports during
PCI controller resume. (Other bus glue resume methods for platforms
supporting high-speed controllers would need a similar change, if any
existed.)
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/ehci-hcd.c')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 99ab31e9778b..b5a7aa90209a 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -399,6 +399,8 @@ static void ehci_port_power (struct ehci_hcd *ehci, int is_on) is_on ? SetPortFeature : ClearPortFeature, USB_PORT_FEAT_POWER, port--, NULL, 0); + /* Flush those writes */ + ehci_readl(ehci, &ehci->regs->command); msleep(20); } |