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Date:   Wed, 16 May 2018 10:02:26 +0200
From:   Greg KH <greg@kroah.com>
To:     Paul Menzel <pmenzel+linux-usb@molgen.mpg.de>
Cc:     Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
        Mario Limonciello <mario.limonciello@dell.com>
Subject: Re: `ucsi_acpi: probe of USBC000:00 failed with error -12` on Dell
 XPS 13 9370
Message-ID: <20180516080226.GC3536@kroah.com>
References: <9365397f-7206-728e-ee76-146629bfd186@molgen.mpg.de>
 <20180515160047.GB26720@kroah.com>
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On Tue, May 15, 2018 at 06:47:37PM +0200, Paul Menzel wrote:
> Dear Greg,
> 
> 
> As always, thank you for the prompt response.
> 
> 
> On 05/15/18 18:00, Greg KH wrote:
> > On Tue, May 15, 2018 at 04:34:03PM +0200, Paul Menzel wrote:
> 
> > > Linux 4.17-rc5 shows the error below on the Dell XPS 13 9370 with Debian
> > > Sid/unstable.
> > > 
> > > ```
> > > […]
> > > [    0.440240] usb: port power management may be unreliable
> > > [    0.441358] usbcore: registered new interface driver usb-storage
> > > [    0.441367] usbcore: registered new interface driver usbserial_generic
> > > [    0.441369] usbserial: USB Serial support registered for generic
> > > [    0.441383] ioremap error for 0x3f799000-0x3f79a000, requested 0x2, got
> > > 0x0
> > > [    0.441518] ucsi_acpi: probe of USBC000:00 failed with error -12
> > > […]
> > > ```
> > > 
> > > 1.  Are the ioremap and ucsi_acpi error related or is a separate report
> > > needed?
> > 
> > The ioremap error is what causes ucsi_acpi to fail the probe call (-12
> > is "out of memory".)
> > 
> > > 2.  Do you know the reason for the ucsi_acpi error?
> > 
> > the call to ioremap failed.
> > 
> > Does this device really have a working typec connector?
> 
> Just to avoid misunderstandings, no device was connected to the laptop
> during my test.
> 
> But, from other boots, the Dell docking station TB16 kind of works with it,
> so I’d say the USB Type-C connector is working.

Ok, good, this might just be the acpi tables not set up properly for
this type of connection.  Odd that the tables show it should work,
Heikki should know more about this.

> > Does normal USB devices work with it?
> 
> Sorry for being ignorant, but could you please tell me what normal USB
> devices are?

If you plug a USB typeC device into this port, does it work?  A docking
station is a little bit "different" in that it usually uses the PCIe
connection, not the USB connectors.  Or at least that's how my Dell
docking station works last time I tried it[1]

thanks,

greg k-h

[1] When the power supply for the docking station is bigger than the
    laptop's power supply, you begin to wonder what is in that thing and
    stop using it after a while...