diff options
| author |   Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2017-04-19 16:55:46 +0300 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-04-19 19:59:16 +0200 |
| commit | 835e4241e714fbd659838618466766b132823da3 (patch) | |
| tree | 1af8a91c7b4bc12969aa0bd38be4c847ed9095ee /drivers/usb/host | |
| parent | usb: host: plat: Enable xHCI plat runtime PM (diff) | |
| download | linux-dev-835e4241e714fbd659838618466766b132823da3.tar.xz linux-dev-835e4241e714fbd659838618466766b132823da3.zip | |
usb: host: xhci-plat: enable clk in resume timing
This patch enables the clk in resume timing when device_may_wakeup()
is false. Otherwise, kernel panic happens when R-Car resumes the system
from Suspend-to-RAM because the clk is disabled.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host')
| -rw-r--r-- | drivers/usb/host/xhci-plat.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c index 60aeaca5b1dc..fd2a440f6f78 100644 --- a/drivers/usb/host/xhci-plat.c +++ b/drivers/usb/host/xhci-plat.c @@ -347,6 +347,7 @@ static int xhci_plat_suspend(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); struct xhci_hcd *xhci = hcd_to_xhci(hcd); + int ret; /* * xhci_suspend() needs `do_wakeup` to know whether host is allowed @@ -356,7 +357,12 @@ static int xhci_plat_suspend(struct device *dev) * reconsider this when xhci_plat_suspend enlarges its scope, e.g., * also applies to runtime suspend. */ - return xhci_suspend(xhci, device_may_wakeup(dev)); + ret = xhci_suspend(xhci, device_may_wakeup(dev)); + + if (!device_may_wakeup(dev) && !IS_ERR(xhci->clk)) + clk_disable_unprepare(xhci->clk); + + return ret; } static int xhci_plat_resume(struct device *dev) @@ -364,6 +370,9 @@ static int xhci_plat_resume(struct device *dev) struct usb_hcd *hcd = dev_get_drvdata(dev); struct xhci_hcd *xhci = hcd_to_xhci(hcd); + if (!device_may_wakeup(dev) && !IS_ERR(xhci->clk)) + clk_prepare_enable(xhci->clk); + return xhci_resume(xhci, 0); } #endif /* CONFIG_PM_SLEEP */ |