linux-kernel - Re: [PATCH v2 1/3] usb: roles: intel

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Date:   Thu, 24 May 2018 09:03:02 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 1/3] usb: roles: intel_xhci: Always allow user control

On Wed, May 23, 2018 at 08:03:43PM +0200, Hans de Goede wrote:
> Hi,
> 
> On 23-05-18 16:37, Heikki Krogerus wrote:
> > Trying to determine the USB port type with this mux is very
> > difficult. To simplify the situation, always allowing user
> > control, even if the port is USB Type-C port.
> > 
> > Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> > ---
> >   .../usb/roles/intel-xhci-usb-role-switch.c    | 21 +------------------
> >   1 file changed, 1 insertion(+), 20 deletions(-)
> > 
> > diff --git a/drivers/usb/roles/intel-xhci-usb-role-switch.c b/drivers/usb/roles/intel-xhci-usb-role-switch.c
> > index 30b07ea3a3c6..3f14153d753f 100644
> > --- a/drivers/usb/roles/intel-xhci-usb-role-switch.c
> > +++ b/drivers/usb/roles/intel-xhci-usb-role-switch.c
> > @@ -39,20 +39,6 @@ struct intel_xhci_usb_data {
> >   	void __iomem *base;
> >   };
> > -struct intel_xhci_acpi_match {
> > -	const char *hid;
> > -	int hrv;
> > -};
> > -
> > -/*
> > - * ACPI IDs for PMICs which do not support separate data and power role
> > - * detection (USB ACA detection for micro USB OTG), we allow userspace to
> > - * change the role manually on these.
> > - */
> > -static const struct intel_xhci_acpi_match allow_userspace_ctrl_ids[] = {
> > -	{ "INT33F4",  3 }, /* X-Powers AXP288 PMIC */
> > -};
> > -
> >   static int intel_xhci_usb_set_role(struct device *dev, enum usb_role role)
> >   {
> >   	struct intel_xhci_usb_data *data = dev_get_drvdata(dev);
> > @@ -139,6 +125,7 @@ static enum usb_role intel_xhci_usb_get_role(struct device *dev)
> >   static struct usb_role_switch_desc sw_desc = {
> >   	.set = intel_xhci_usb_set_role,
> >   	.get = intel_xhci_usb_get_role,
> > +	.allow_userspace_control = true,
> >   };
> >   static int intel_xhci_usb_probe(struct platform_device *pdev)
> 
> 
> I hate to be pedantic here, but the sw_desc can and should be made
> const now, with that fixed the entire series is:

Sure, I'll fix that.

> Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Thanks Hans. I'll send the v3. I need to add one more fix to the
series.

I got a report where somebody hit the issue related to the runtime PM
we talked about a while back: If xHCI is suspended, we fail to program
the mux registers as they are part of xHCI MMIO, so I will add a patch
to this series where I enable runtime PM here to fix that problem.


Cheers,

-- 
heikki