From 835e4241e714fbd659838618466766b132823da3 Mon Sep 17 00:00:00 2001 From: Yoshihiro Shimoda Date: Wed, 19 Apr 2017 16:55:46 +0300 Subject: [PATCH] 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 Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-plat.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) 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 */