linux-kernel - Re: [PATCH v4] usb: ehci: handshake CMD_RUN instead of STS

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Date:   Wed, 6 Oct 2021 01:27:02 +0000
From:   Joel Stanley <joel@....id.au>
To:     Neal Liu <neal_liu@...eedtech.com>
Cc:     Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tony Prisk <linux@...sktech.co.nz>, linux-usb@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Tao Ren <rentao.bupt@...il.com>,
        BMC-SW <BMC-SW@...eedtech.com>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Bruce Mitchell <Bruce.Mitchell@....com>,
        Eddie James <eajames@...ux.ibm.com>
Subject: Re: [PATCH v4] usb: ehci: handshake CMD_RUN instead of STS_HALT

Hi Greg,

On Fri, 10 Sept 2021 at 07:38, Neal Liu <neal_liu@...eedtech.com> 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@...eedtech.com>
> Acked-by: Alan Stern <stern@...land.harvard.edu>
> Reviewed-by: Tao Ren <rentao.bupt@...il.com>
> Tested-by: Tao Ren <rentao.bupt@...il.com>

Has this one gone in? If not, here's some tags:

Reviewed-by: Joel Stanley <joel@....id.au>

It also needs to go to stable:

Cc: stable@...r.kernel.org
Fixes: 280a9045bb18 ("ehci: fix EHCI host controller initialization sequence")

Cheers,

Joel

> ---
>  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(-)
>
> ---
> Fix STS_HALT handshake failure for Aspeed 2500/2600 platform.
>
> Change since v3:
> - Add more description.
>
> 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.
> ---
>
> diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
> index 6bdc6d6bf74d..55f92d25336b 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.
> +        * Check CMD_RUN instead.
> +        */
> +       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)
> --
> 2.25.1
>