Hi,
(since you're fixing somebody else's commit, it's nice to Cc authors)
Jisheng Zhang <jszhang@xxxxxxxxxxx> writes:
> Commit 4718c1774051 ("usb: host: xhci-plat: add clock support") adds
> optional clk support, but it forgets to prepare/disable and
^^^^^^^^^^^^^^^
prepare/enable ?
> enable/unprepare the clk in the resume/suspend path. This path fixes
^^^^^^^^^^^^^^^^ ^^^^
disable/unprepare ? patch
> this issue by adding missing clk related calls.
frankly, I'm not sure this patch is entirely correct. At minimum, it's
not necessarily a bug fix. Original commit had no intent in gating
clocks during suspend/resume and, IMHO, that might not be what *all*
XHCI implementations want, though I'm not entirely sure.
> Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxxx>
> Fixes: 4718c1774051 ("usb: host: xhci-plat: add clock support")
Assuming this is, indeed, a fix; you need to Cc stable here. Just add:
Cc: <stable@xxxxxxxxxxxxxxx> # v3.16+
> ---
> drivers/usb/host/xhci-plat.c | 14 +++++++++++++-
> 1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 474b5fa..8cb46cb 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -295,6 +295,7 @@ static int xhci_plat_remove(struct platform_device *dev)
> #ifdef CONFIG_PM_SLEEP
> static int xhci_plat_suspend(struct device *dev)
> {
> + int ret;
this would look neater after hcd and xhci declarations below
> struct usb_hcd *hcd = dev_get_drvdata(dev);
> struct xhci_hcd *xhci = hcd_to_xhci(hcd);
>
> @@ -306,14 +307,25 @@ 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 (ret)
> + return ret;
> +
> + clk_disable_unprepare(xhci->clk);
> +
> + return ret;
> }
>
> static int xhci_plat_resume(struct device *dev)
> {
> + int ret;
ditto
> struct usb_hcd *hcd = dev_get_drvdata(dev);
> struct xhci_hcd *xhci = hcd_to_xhci(hcd);
>
> + ret = clk_prepare_enable(xhci->clk);
> + if (ret)
> + return ret;
> +
> return xhci_resume(xhci, 0);
> }
>
> --
> 2.8.1
>
> --
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--
balbi
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