Re: [PATCH v3] usb: ehci: handshake CMD_RUN instead of STS_HALT

[Greg Kroah-Hartman]

On Thu, Sep 09, 2021 at 11:13:15AM +0000, Neal Liu wrote:
> > -----Original Message-----
> > From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> > Sent: Thursday, September 9, 2021 2:38 PM
> > To: Neal Liu <neal_liu@xxxxxxxxxxxxxx>
> > Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>; Tony Prisk
> > <linux@xxxxxxxxxxxxxxx>; linux-usb@xxxxxxxxxxxxxxx;
> > linux-kernel@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; Tao Ren
> > <rentao.bupt@xxxxxxxxx>; BMC-SW <BMC-SW@xxxxxxxxxxxxxx>
> > Subject: Re: [PATCH v3] usb: ehci: handshake CMD_RUN instead of STS_HALT
> > 
> > On Thu, Sep 09, 2021 at 02:36:52PM +0800, Neal Liu wrote:
> 
> Fix STS_HALT handshake failure for Aspeed 2500/2600 platform.
> 
> Change since v2:
> - Use my "real" name for both the Signed-off-by: line and the From: line.
> 
> Change since v1:
> - Handshake CMD_RUN status on startup instead of easily skip it.
> 
> ---
> > > 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@xxxxxxxxxxxxxx>
> > > Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> > > Reviewed-by: Tao Ren <rentao.bupt@xxxxxxxxx>
> > > Tested-by: Tao Ren <rentao.bupt@xxxxxxxxx>
> > >
> > > ---
> > >  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:
> > 
> > - You did not specify a description of why the patch is needed, or
> >   possibly, any description at all, in the email body.  Please read the
> >   section entitled "The canonical patch format" in the kernel file,
> >   Documentation/SubmittingPatches for what is needed in order to
> >   properly describe the change.
> > 
> > - 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
> 
> Do you prefer fixing canonical patch format inline or sending new patch v4?
> I added more description and the changes from previous version.

v4 please.

thanks,

greg k-h