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

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Date:   Wed, 8 Sep 2021 22:45:32 -0700
From:   Tao Ren <rentao.bupt@...il.com>
To:     neal_liu <neal_liu@...eedtech.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-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        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