linux-kernel - RE: [PATCH v2] usb: ehci: handshake CMD_RUN instead of STS

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Date:   Thu, 9 Sep 2021 06:23:10 +0000
From:   Neal Liu <neal_liu@...eedtech.com>
To:     Tao Ren <rentao.bupt@...il.com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Tony Prisk <linux@...sktech.co.nz>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        BMC-SW <BMC-SW@...eedtech.com>
Subject: RE: [PATCH v2] usb: ehci: handshake CMD_RUN instead of STS_HALT


> Hi Neal,
> 
> On Wed, Sep 01, 2021 at 08:07:53AM +0200, Greg Kroah-Hartman wrote:
> > 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@...eedtech.com>
> > > ---
> > >  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
> > >
> >
> > Hi,
> >
> > This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent
> > him a patch that has triggered this response.  He used to manually
> > respond to these common problems, but in order to save his sanity (he
> > kept writing the same thing over and over, yet to different people), I
> > was created.  Hopefully you will not take offence and will fix the
> > problem in your patch and resubmit it so that it can be accepted into
> > the Linux kernel tree.
> >
> > You are receiving this message because of the following common
> > error(s) as indicated below:
> >
> > - It looks like you did not use your "real" name for the patch on either
> >   the Signed-off-by: line, or the From: line (both of which have to
> >   match).  Please read the kernel file, Documentation/SubmittingPatches
> >   for how to do this correctly.
> >
> > - This looks like a new version of a previously submitted patch, but you
> >   did not list below the --- line any changes from the previous version.
> >   Please read the section entitled "The canonical patch format" in the
> >   kernel file, Documentation/SubmittingPatches for what needs to be done
> >   here to properly describe this.
> >
> > If you wish to discuss this problem further, or you have questions
> > about how to resolve this issue, please feel free to respond to this
> > email and Greg will reply once he has dug out from the pending patches
> > received from other developers.
> >
> > thanks,
> >
> > greg k-h's patch email bot
> 
> Thank you Neal for the patch. I tried the fix on my CMM (AST2500) and Fuji
> (AST2600) BMC and it works on both platforms.
> 
> Can you please address Greg's comments above and send out a new version?
> BTW, please don't forget to include Alan's Acked-by in the new version.
> 
> Reviewed-by: Tao Ren <rentao.bupt@...il.com>
> Tested-by: Tao Ren <rentao.bupt@...il.com>
> 
> 
> Cheers,
> 
> Tao

Sure! I'll try to fix Greg's comments on next patch. I think the problem is the first one.
And thanks for your review & test.

-Neal