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

[Greg Kroah-Hartman]

On Thu, Sep 09, 2021 at 02:36:52PM +0800, Neal Liu wrote:
> 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
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Greg will reply once he has dug out from the pending patches received
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thanks,

greg k-h's patch email bot