From: Neal Liu <neal_liu@aspeedtech.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Tony Prisk <linux@prisktech.co.nz>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Tao Ren <rentao.bupt@gmail.com>, BMC-SW <BMC-SW@aspeedtech.com>
Subject: RE: [PATCH v2] usb: ehci: handshake CMD_RUN instead of STS_HALT
Date: Thu, 2 Sep 2021 01:52:15 +0000 [thread overview]
Message-ID: <TY2PR06MB3213D02995C616679B1DD47780CE9@TY2PR06MB3213.apcprd06.prod.outlook.com> (raw)
In-Reply-To: <20210901164107.GD404634@rowland.harvard.edu>
> -----Original Message-----
> From: Alan Stern <stern@rowland.harvard.edu>
> Sent: Thursday, September 2, 2021 12:41 AM
> To: Neal Liu <neal_liu@aspeedtech.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>; Tony Prisk
> <linux@prisktech.co.nz>; linux-usb@vger.kernel.org;
> linux-kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org; Tao Ren
> <rentao.bupt@gmail.com>; BMC-SW <BMC-SW@aspeedtech.com>
> Subject: Re: [PATCH v2] usb: ehci: handshake CMD_RUN instead of STS_HALT
>
> On Wed, Sep 01, 2021 at 11:50:41AM +0800, neal_liu wrote:
> > Retitle.
> >
> > For Aspeed, HCHalted status depends on not only Run/Stop but also
> > ASS/PSS status.
> > Handshake CMD_RUN on startup instead.
> >
> > Signed-off-by: neal_liu <neal_liu@aspeedtech.com>
>
> I'm still a little doubtful about doing this, but if you guys say it works for your
> hardware then I guess it's okay.
>
> Acked-by: Alan Stern <stern@rowland.harvard.edu>
Thanks for your review.
> > ---
> > drivers/usb/host/ehci-hcd.c | 11 ++++++++++-
> > drivers/usb/host/ehci-platform.c | 6 ++++++
> > drivers/usb/host/ehci.h | 1 +
> > 3 files changed, 17 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
> > index 10b0365f3439..01c022e46aa2 100644
> > --- a/drivers/usb/host/ehci-hcd.c
> > +++ b/drivers/usb/host/ehci-hcd.c
> > @@ -634,7 +634,16 @@ static int ehci_run (struct usb_hcd *hcd)
> > /* Wait until HC become operational */
> > ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
> > msleep(5);
> > - rc = ehci_handshake(ehci, &ehci->regs->status, STS_HALT, 0, 100 * 1000);
> > +
> > + /* For Aspeed, STS_HALT also depends on ASS/PSS status.
> > + * Skip this check on startup.
> > + */
> > + if (ehci->is_aspeed)
> > + rc = ehci_handshake(ehci, &ehci->regs->command, CMD_RUN,
> > + 1, 100 * 1000);
> > + else
> > + rc = ehci_handshake(ehci, &ehci->regs->status, STS_HALT,
> > + 0, 100 * 1000);
> >
> > up_write(&ehci_cf_port_reset_rwsem);
> >
> > diff --git a/drivers/usb/host/ehci-platform.c
> > b/drivers/usb/host/ehci-platform.c
> > index c70f2d0b4aaf..c3dc906274d9 100644
> > --- a/drivers/usb/host/ehci-platform.c
> > +++ b/drivers/usb/host/ehci-platform.c
> > @@ -297,6 +297,12 @@ static int ehci_platform_probe(struct
> platform_device *dev)
> > "has-transaction-translator"))
> > hcd->has_tt = 1;
> >
> > + if (of_device_is_compatible(dev->dev.of_node,
> > + "aspeed,ast2500-ehci") ||
> > + of_device_is_compatible(dev->dev.of_node,
> > + "aspeed,ast2600-ehci"))
> > + ehci->is_aspeed = 1;
> > +
> > if (soc_device_match(quirk_poll_match))
> > priv->quirk_poll = true;
> >
> > diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h index
> > 80bb823aa9fe..fdd073cc053b 100644
> > --- a/drivers/usb/host/ehci.h
> > +++ b/drivers/usb/host/ehci.h
> > @@ -219,6 +219,7 @@ struct ehci_hcd { /* one per controller */
> > unsigned need_oc_pp_cycle:1; /* MPC834X port power */
> > unsigned imx28_write_fix:1; /* For Freescale i.MX28 */
> > unsigned spurious_oc:1;
> > + unsigned is_aspeed:1;
> >
> > /* required for usb32 quirk */
> > #define OHCI_CTRL_HCFS (3 << 6)
> > --
> > 2.17.1
> >
prev parent reply other threads:[~2021-09-02 1:52 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-01 3:50 [PATCH v2] usb: ehci: handshake CMD_RUN instead of STS_HALT neal_liu
2021-09-01 6:07 ` Greg Kroah-Hartman
2021-09-09 5:45 ` Tao Ren
2021-09-09 6:23 ` Neal Liu
2021-09-09 6:38 ` Greg Kroah-Hartman
2021-09-09 10:42 ` Neal Liu
2021-09-01 16:41 ` Alan Stern
2021-09-02 1:52 ` Neal Liu [this message]
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