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usb: host: xhci-plat: suspend and resume clocks

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[ Upstream commit 8bd954c56197caf5e3a804d989094bc3fe6329aa ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Justin Chen
2022-08-10 15:27:34 -07:00
committed by Greg Kroah-Hartman
parent 12d31182de
commit c13d0d2f5a
2 changed files with 16 additions and 1 deletions
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16
drivers/usb/host/xhci-plat.c
View File

@@ -447,7 +447,16 @@ static int __maybe_unused xhci_plat_suspend(struct device *dev)
* xhci_suspend() needs `do_wakeup` to know whether host is allowed * xhci_suspend() needs `do_wakeup` to know whether host is allowed
* to do wakeup during suspend. * 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) static int __maybe_unused xhci_plat_resume(struct device *dev)
@@ -456,6 +465,11 @@ static int __maybe_unused xhci_plat_resume(struct device *dev)
struct xhci_hcd *xhci = hcd_to_xhci(hcd); struct xhci_hcd *xhci = hcd_to_xhci(hcd);
int ret; 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); ret = xhci_priv_resume_quirk(hcd);
if (ret) if (ret)
return ret; return ret;

1
drivers/usb/host/xhci.h
View File

@@ -1888,6 +1888,7 @@ struct xhci_hcd {
#define XHCI_SG_TRB_CACHE_SIZE_QUIRK BIT_ULL(39) #define XHCI_SG_TRB_CACHE_SIZE_QUIRK BIT_ULL(39)
#define XHCI_NO_SOFT_RETRY BIT_ULL(40) #define XHCI_NO_SOFT_RETRY BIT_ULL(40)
#define XHCI_EP_CTX_BROKEN_DCS BIT_ULL(42) #define XHCI_EP_CTX_BROKEN_DCS BIT_ULL(42)
#define XHCI_SUSPEND_RESUME_CLKS BIT_ULL(43)
unsigned int num_active_eps; unsigned int num_active_eps;
unsigned int limit_active_eps; unsigned int limit_active_eps;