Re: [PATCH] usb: host: xhci-plat: fix support for XHCI_SKIP_PHY_INIT quirk

From: Pali Rohár
Date: Tue Dec 22 2020 - 08:31:37 EST


On Tuesday 22 December 2020 10:23:27 Pali Rohár wrote:
> On Tuesday 22 December 2020 02:14:45 Peter Chen wrote:
> > On 20-12-21 16:09:03, Pali Rohár wrote:
> > > Currently init_quirk callbacks for xhci platform drivers are called
> > > xhci_plat_setup() function which is called after chip reset completes.
> > > It happens in the middle of the usb_add_hcd() function.
> > >
> > > But XHCI_SKIP_PHY_INIT quirk is checked in the xhci_plat_probe() function
> > > prior calling usb_add_hcd() function. Therefore this XHCI_SKIP_PHY_INIT
> > > currently does nothing as prior xhci_plat_setup() it is not set.
> > >
> > > Quirk XHCI_SKIP_PHY_INIT is only setting hcd->skip_phy_initialization value
> > > which really needs to be set prior calling usb_add_hcd() as this function
> > > at its beginning skips PHY init if this member is set.
> > >
> > > This patch fixes implementation of the XHCI_SKIP_PHY_INIT quirk by calling
> > > init_quirk callbacks (via xhci_priv_init_quirk()) prior checking if
> > > XHCI_SKIP_PHY_INIT is set.
> > >
> > > Fixes: f768e718911e0 ("usb: host: xhci-plat: add priv quirk for skip PHY initialization")
> > > Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
> > > ---
> > > drivers/usb/host/xhci-plat.c | 14 +++++++-------
> > > 1 file changed, 7 insertions(+), 7 deletions(-)
> > >
> > > diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> > > index 4d34f6005381..58704c5b002b 100644
> > > --- a/drivers/usb/host/xhci-plat.c
> > > +++ b/drivers/usb/host/xhci-plat.c
> > > @@ -89,13 +89,6 @@ static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
> > > /* called during probe() after chip reset completes */
> > > static int xhci_plat_setup(struct usb_hcd *hcd)
> > > {
> > > - int ret;
> > > -
> > > -
> > > - ret = xhci_priv_init_quirk(hcd);
> > > - if (ret)
> > > - return ret;
> > > -
> > > return xhci_gen_setup(hcd, xhci_plat_quirks);
> > > }
> > >
> > > @@ -330,6 +323,13 @@ static int xhci_plat_probe(struct platform_device *pdev)
> > >
> > > hcd->tpl_support = of_usb_host_tpl_support(sysdev->of_node);
> > > xhci->shared_hcd->tpl_support = hcd->tpl_support;
> > > +
> > > + if (priv) {
> > > + ret = xhci_priv_init_quirk(hcd);
> > > + if (ret)
> > > + goto disable_usb_phy;
> > > + }
> > > +
> > > if (priv && (priv->quirks & XHCI_SKIP_PHY_INIT))
> > > hcd->skip_phy_initialization = 1;
> > >
> >
> > Hi Pali,
> >
> > What's problem you have met? In structure xhci_plat_priv, the quirks are
> > defined at .quirks entry which is got at below code. .init_quirk is the
> > routine if special initializations are needed.
>
> Hello!
>
> I'm talking about .init_quirk. And if XHCI_SKIP_PHY_INIT quirk is set in
> this function then has no effect.

Ok, this patch is not enough, I will send V2.

> I'm working currently on patch for xhci mvebu which conditionally enable
> or disable XHCI_SKIP_PHY_INIT quirk (it is going to fix existing
> regression since v5.1 kernel) and without this patch XHCI_SKIP_PHY_INIT
> quirk from the init_quirk does not work.

And now I have tested V2 with my mvebu regression fix. I will send it to
mailing list for review.

> > if (pdev->dev.of_node)
> > priv_match = of_device_get_match_data(&pdev->dev);
> > else
> > priv_match = dev_get_platdata(&pdev->dev);
> >
> > if (priv_match) {
> > priv = hcd_to_xhci_priv(hcd);
> > /* Just copy data for now */
> > *priv = *priv_match;
> > }
> > --
> >
> > Thanks,
> > Peter Chen