linux-kernel - Re: [PATCH v2 2/4] usb: xhci: xhci-plat: Add support for Broadcom STB SoC's

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Date:   Mon, 6 Apr 2020 11:28:20 -0400
From:   Alan Cooper <alcooperx@...il.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>
Cc:     ": Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Alan Stern <stern@...land.harvard.edu>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        DTML <devicetree@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        USB list <linux-usb@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v2 2/4] usb: xhci: xhci-plat: Add support for Broadcom STB SoC's

On Sun, Mar 29, 2020 at 10:35 PM Chunfeng Yun <chunfeng.yun@...iatek.com> wrote:
>
> Hi,
...
> > +     }, {
> > +             .compatible = "brcm,xhci-brcm-v2",
> > +             .data = &xhci_plat_brcm,
> This one is not described in dt-binding.

This is an obsolete name, but was left in the driver for backward
compatibility with some older boards that still have this in their
device tree.

> > +     }, {
> > +             .compatible = "brcm,bcm7445-xhci",
> > +             .data = &xhci_plat_brcm,
> bcm7445 is a SoC name ?
> the quirk only happens on this one? or on all SoCs with Broadcom xHIC
> IP?

bcm7445 is the first SoC with this style controller and all subsequent
SoCs contain this compatible entry and also have the quirk.

>
> >       },
> >       {},
> >  };

Thanks
Al

On Sun, Mar 29, 2020 at 10:35 PM Chunfeng Yun <chunfeng.yun@...iatek.com> wrote:
>
> Hi,
> On Fri, 2020-03-27 at 16:47 -0400, Al Cooper wrote:
> > Add support for Broadcom STB SoC's to the xhci platform driver
> >
> > Signed-off-by: Al Cooper <alcooperx@...il.com>
> > ---
> >  drivers/usb/host/xhci-brcm.c | 16 ++++++++++++++++
> >  drivers/usb/host/xhci-brcm.h | 16 ++++++++++++++++
> >  drivers/usb/host/xhci-plat.c | 11 +++++++++++
> >  3 files changed, 43 insertions(+)
> >  create mode 100644 drivers/usb/host/xhci-brcm.c
> >  create mode 100644 drivers/usb/host/xhci-brcm.h
> >
> > diff --git a/drivers/usb/host/xhci-brcm.c b/drivers/usb/host/xhci-brcm.c
> > new file mode 100644
> > index 000000000000..bf8c0bfd1780
> > --- /dev/null
> > +++ b/drivers/usb/host/xhci-brcm.c
> > @@ -0,0 +1,16 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/* Copyright (c) 2018, Broadcom */
> > +
> > +#include <linux/usb.h>
> > +#include <linux/usb/hcd.h>
> > +
> > +#include "xhci.h"
> > +
> > +int xhci_plat_brcm_init_quirk(struct usb_hcd *hcd)
> > +{
> > +     struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> > +
> > +     xhci->quirks |= XHCI_RESET_ON_RESUME;
> > +     return 0;
> > +}
> > +
> > diff --git a/drivers/usb/host/xhci-brcm.h b/drivers/usb/host/xhci-brcm.h
> > new file mode 100644
> > index 000000000000..e64800fae4d5
> > --- /dev/null
> > +++ b/drivers/usb/host/xhci-brcm.h
> > @@ -0,0 +1,16 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/* Copyright (c) 2018, Broadcom */
> > +
> > +#ifndef _XHCI_BRCM_H
> > +#define _XHCI_BRCM_H
> > +
> > +#if IS_ENABLED(CONFIG_USB_XHCI_BRCM)
> > +int xhci_plat_brcm_init_quirk(struct usb_hcd *hcd);
> > +#else
> > +static inline int xhci_plat_brcm_init_quirk(struct usb_hcd *hcd)
> > +{
> > +     return 0;
> > +}
> > +#endif
> > +#endif /* _XHCI_BRCM_H */
> > +
> > diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> > index 315b4552693c..3e90a1207803 100644
> > --- a/drivers/usb/host/xhci-plat.c
> > +++ b/drivers/usb/host/xhci-plat.c
> > @@ -22,6 +22,7 @@
> >
> >  #include "xhci.h"
> >  #include "xhci-plat.h"
> > +#include "xhci-brcm.h"
> >  #include "xhci-mvebu.h"
> >  #include "xhci-rcar.h"
> >
> > @@ -112,6 +113,10 @@ static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen3 = {
> >       SET_XHCI_PLAT_PRIV_FOR_RCAR(XHCI_RCAR_FIRMWARE_NAME_V3)
> >  };
> >
> > +static const struct xhci_plat_priv xhci_plat_brcm = {
> > +     .init_quirk = xhci_plat_brcm_init_quirk,
> > +};
> > +
> >  static const struct of_device_id usb_xhci_of_match[] = {
> >       {
> >               .compatible = "generic-xhci",
> > @@ -147,6 +152,12 @@ static const struct of_device_id usb_xhci_of_match[] = {
> >       }, {
> >               .compatible = "renesas,rcar-gen3-xhci",
> >               .data = &xhci_plat_renesas_rcar_gen3,
> > +     }, {
> > +             .compatible = "brcm,xhci-brcm-v2",
> > +             .data = &xhci_plat_brcm,
> This one is not described in dt-binding.
> > +     }, {
> > +             .compatible = "brcm,bcm7445-xhci",
> > +             .data = &xhci_plat_brcm,
> bcm7445 is a SoC name ?
> the quirk only happens on this one? or on all SoCs with Broadcom xHIC
> IP?
>
> >       },
> >       {},
> >  };
>