linux-kernel - Re: [PATCH v1 06/11] usb: misc: onboard_usb_hub: add Genesys Logic GL3523-QFN76 hub support

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Message-ID: <Y7w/PGMrjHFAjHNH@google.com>
Date:   Mon, 9 Jan 2023 16:22:20 +0000
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Anand Moon <linux.amoon@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-amlogic@...ts.infradead.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 06/11] usb: misc: onboard_usb_hub: add Genesys Logic
 GL3523-QFN76 hub support

On Sat, Jan 07, 2023 at 08:28:11PM +0530, Anand Moon wrote:
> Hi Matthias,
> 
> Thanks for your review comments,
> 
> On Thu, 5 Jan 2023 at 02:13, Matthias Kaehlcke <mka@...omium.org> wrote:
> >
> > Hi Anand,
> >
> > On Wed, Dec 28, 2022 at 10:03:15AM +0000, Anand Moon wrote:
> > > Genesys Logic GL3523-QFN76 is a 4-port USB 3.1 hub that has a reset pin to
> > > toggle and a 5.0V core supply exported though an integrated LDO is
> > > available for powering it.
> > >
> > > Add the support for this hub, for controlling the reset pin and the core
> > > power supply.
> > >
> > > Signed-off-by: Anand Moon <linux.amoon@...il.com>
> > > ---
> > >  drivers/usb/misc/onboard_usb_hub.c | 1 +
> > >  drivers/usb/misc/onboard_usb_hub.h | 1 +
> > >  2 files changed, 2 insertions(+)
> > >
> > > diff --git a/drivers/usb/misc/onboard_usb_hub.c b/drivers/usb/misc/onboard_usb_hub.c
> > > index c0e8e6f4ec0a..699050eb3f17 100644
> > > --- a/drivers/usb/misc/onboard_usb_hub.c
> > > +++ b/drivers/usb/misc/onboard_usb_hub.c
> > > @@ -410,6 +410,7 @@ static void onboard_hub_usbdev_disconnect(struct usb_device *udev)
> > >  static const struct usb_device_id onboard_hub_id_table[] = {
> > >       { USB_DEVICE(VENDOR_ID_GENESYS, 0x0608) }, /* Genesys Logic GL850G USB 2.0 */
> > >       { USB_DEVICE(VENDOR_ID_GENESYS, 0x0610) }, /* Genesys Logic GL852G-OHG USB 2.0 */
> > > +     { USB_DEVICE(VENDOR_ID_GENESYS, 0x0620) }, /* Genesys Logic GL3523-QFN76 USB 3.1 */
> >
> > Please drop the '-QFN76' suffix. The GL3523 comes in different packages, 'QFN76'
> > is one of them, I'd expect the other packages to use the same product id.
> >
> > The GL3523 is a single IC, however like the TI USB8041 or the RTS5414 it
> > provides both a USB 3.1 and a USB 2.0 hub. You should also add an entry for
> > the USB 2.0 hub here.
> >
> 
> Ok,
> 
> > >       { USB_DEVICE(VENDOR_ID_MICROCHIP, 0x2514) }, /* USB2514B USB 2.0 */
> > >       { USB_DEVICE(VENDOR_ID_REALTEK, 0x0411) }, /* RTS5411 USB 3.1 */
> > >       { USB_DEVICE(VENDOR_ID_REALTEK, 0x5411) }, /* RTS5411 USB 2.1 */
> > > diff --git a/drivers/usb/misc/onboard_usb_hub.h b/drivers/usb/misc/onboard_usb_hub.h
> > > index 2ee1b0032d23..b32fad3a70f9 100644
> > > --- a/drivers/usb/misc/onboard_usb_hub.h
> > > +++ b/drivers/usb/misc/onboard_usb_hub.h
> > > @@ -32,6 +32,7 @@ static const struct of_device_id onboard_hub_match[] = {
> > >       { .compatible = "usb451,8142", .data = &ti_tusb8041_data, },
> > >       { .compatible = "usb5e3,608", .data = &genesys_gl850g_data, },
> > >       { .compatible = "genesys,usb5e3,610", .data = &genesys_gl850g_data, },
> > > +     { .compatible = "genesys,usb5e3,620", .data = &genesys_gl850g_data, },
> >
> > s/genesys,//
> >
> > This reuses the settings of the GL850G hub, which doesn't seem correct in
> > this case. For the GL850G a (minimum) reset time of 3us is configured. The
> > data sheet of the GL3523 says:
> >
> >   "The (internal) reset will be released after approximately 40 μS after
> >    power good.
> >
> >    To fully control the reset process of GL3523, we suggest the reset time
> >    applied in the external reset circuit should longer than that of the
> >    internal reset circuit."
> >
> > Since it is 'approximately 40 μS' I'd say make the external reset 50 μS
> > to be on the safe side, it's a very short time in any case.
> >
> 
> Thanks for this input will update this in the next version.
> 
> > Please also add an entry for the USB 2.0 part of the IC.
> 
> alarm@...oid-n2:~$ lsusb -tv
> /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
>     ID 1d6b:0003 Linux Foundation 3.0 root hub
>     |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 5000M
>         ID 05e3:0620 Genesys Logic, Inc. GL3523 Hub
> /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/2p, 480M
>     ID 1d6b:0002 Linux Foundation 2.0 root hub
>     |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
>         ID 05e3:0610 Genesys Logic, Inc. Hub
> 
> So earlier patch adds support for this device ID.

Do I understand correctly that 0x0610 is the product id of both the
GL852G [1] and the USB 2 part of the GL3523 (the above 'lsusb'
output)?

[1] https://patchwork.kernel.org/project/linux-usb/patch/20221228100321.15949-2-linux.amoon@gmail.com/