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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>
This commit is contained in:
Justin Chen 2022-08-10 15:27:34 -07:00 committed by Greg Kroah-Hartman
parent b7feb442ee
commit 8bd954c561
2 changed files with 16 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/usb/host/xhci-plat.c
View File

@ -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;

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

@ -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;