diff options
| author | Justin Chen <justinpopo6@gmail.com> | 2022-08-10 15:27:34 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-31 09:07:53 +0200 |
| commit | 8bd954c56197caf5e3a804d989094bc3fe6329aa (patch) | |
| tree | 2a01b9d8e2200c8581c5dc8b4ae58dfbd9b357aa | |
| parent | b7feb442ee8692532a00e36447cdac0059cfd93d (diff) | |
usb: host: xhci-plat: suspend and resume clocks
Introduce XHCI_SUSPEND_RESUME_CLKS quirk as a means to suspend and resume
clocks if the hardware is capable of doing so. We assume that clocks will
be needed if the device may wake.
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Justin Chen <justinpopo6@gmail.com>
Link: https://lore.kernel.org/r/1660170455-15781-2-git-send-email-justinpopo6@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/host/xhci-plat.c | 16 | ||||
| -rw-r--r-- | drivers/usb/host/xhci.h | 1 |
2 files changed, 16 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c index 044855818cb1..a68b2b017b74 100644 --- a/drivers/usb/host/xhci-plat.c +++ b/drivers/usb/host/xhci-plat.c @@ -432,7 +432,16 @@ static int __maybe_unused xhci_plat_suspend(struct device *dev) * xhci_suspend() needs `do_wakeup` to know whether host is allowed * to do wakeup during suspend. */ - return xhci_suspend(xhci, device_may_wakeup(dev)); + ret = xhci_suspend(xhci, device_may_wakeup(dev)); + if (ret) + return ret; + + if (!device_may_wakeup(dev) && (xhci->quirks & XHCI_SUSPEND_RESUME_CLKS)) { + clk_disable_unprepare(xhci->clk); + clk_disable_unprepare(xhci->reg_clk); + } + + return 0; } static int __maybe_unused xhci_plat_resume(struct device *dev) @@ -441,6 +450,11 @@ static int __maybe_unused xhci_plat_resume(struct device *dev) struct xhci_hcd *xhci = hcd_to_xhci(hcd); int ret; + if (!device_may_wakeup(dev) && (xhci->quirks & XHCI_SUSPEND_RESUME_CLKS)) { + clk_prepare_enable(xhci->clk); + clk_prepare_enable(xhci->reg_clk); + } + ret = xhci_priv_resume_quirk(hcd); if (ret) return ret; diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 1960b47acfb2..182d1d4792d1 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1899,6 +1899,7 @@ struct xhci_hcd { #define XHCI_NO_SOFT_RETRY BIT_ULL(40) #define XHCI_BROKEN_D3COLD BIT_ULL(41) #define XHCI_EP_CTX_BROKEN_DCS BIT_ULL(42) +#define XHCI_SUSPEND_RESUME_CLKS BIT_ULL(43) unsigned int num_active_eps; unsigned int limit_active_eps; |