Commit 8bd954c5 authored by Justin Chen's avatar Justin Chen Committed by Greg Kroah-Hartman
Browse files

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: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarJustin Chen <justinpopo6@gmail.com>
Link: https://lore.kernel.org/r/1660170455-15781-2-git-send-email-justinpopo6@gmail.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b7feb442

drivers/usb/host/xhci-plat.c

+15 −1
Original line number Diff line number Diff line
@@ -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;

drivers/usb/host/xhci.h

+1 −0
Original line number Diff line number Diff line
@@ -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;