From: "Pali Rohár" <pali@kernel.org>
To: Peter Chen <peter.chen@nxp.com>
Cc: Mathias Nyman <mathias.nyman@intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jun Li <jun.li@nxp.com>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] usb: host: xhci-plat: fix support for XHCI_SKIP_PHY_INIT quirk
Date: Tue, 22 Dec 2020 14:30:51 +0100 [thread overview]
Message-ID: <20201222133051.jfvrgkcdhjnldz3z@pali> (raw)
In-Reply-To: <20201222092327.jq5b7g4bffeccq3o@pali>
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@kernel.org>
> > > ---
> > > 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
next prev parent reply other threads:[~2020-12-22 13:31 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-21 15:09 [PATCH] usb: host: xhci-plat: fix support for XHCI_SKIP_PHY_INIT quirk Pali Rohár
2020-12-22 2:14 ` Peter Chen
2020-12-22 9:23 ` Pali Rohár
2020-12-22 13:30 ` Pali Rohár [this message]
2020-12-23 1:02 ` Peter Chen
2020-12-23 1:04 ` Pali Rohár
2020-12-23 16:18 ` [PATCH v2] " Pali Rohár
2020-12-24 5:59 ` Peter Chen
2021-01-13 23:20 ` Pali Rohár
2021-01-15 13:32 ` Mathias Nyman
2021-01-25 14:20 ` Pali Rohár
2021-01-26 4:27 ` Yoshihiro Shimoda
2021-01-26 9:06 ` Pali Rohár
2021-02-01 15:11 ` Pali Rohár
2021-02-02 1:17 ` Yoshihiro Shimoda
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