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usb: host: xhci-plat: enable clk in resume timing

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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>
This commit is contained in:
Yoshihiro Shimoda 2017-04-19 16:55:46 +03:00 committed by Greg Kroah-Hartman
parent b0c69b4bac
commit 835e4241e7
1 changed files with 10 additions and 1 deletions
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11
drivers/usb/host/xhci-plat.c
View file

@ -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 */