linux-kernel - Re: ucsi_acpi: probe of USBC000:00 fails with ioremap error

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Date:   Sat, 19 Mar 2022 06:36:29 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Dell.Client.Kernel@...l.com,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: ucsi_acpi: probe of USBC000:00 fails with ioremap error

[Cc: +Kai-Heng, +Hans]

Dear Heikki,


Am 18.03.22 um 15:37 schrieb Heikki Krogerus:

> On Fri, Mar 18, 2022 at 01:36:37PM +0100, Paul Menzel wrote:

>> On a Dell Precision 3540, Linux 5.16.12 reports an ioremap error:
>>
>>      [    0.000000] Linux version 5.16.0-4-amd64 (debian-kernel@...ts.debian.org) (gcc-11 (Debian 11.2.0-18) 11.2.0, GNU ld (GNU Binutils for Debian) 2.38) #1 SMP PREEMPT Debian 5.16.12-1 (2022-03-08)
>>      [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-5.16.0-4-amd64 root=UUID=c9342a55-b747-4442-b2f4-bc03eb7a51cf ro quiet noisapnp log_buf_len=2M cryptomgr.notests btusb.enable_autosuspend=y random.trust_cpu=on
>>      […]
>>      [    0.000000] DMI: Dell Inc. Precision 3540/0M14W7, BIOS 1.15.0 12/08/2021
>>      […]
>>      [   24.230968] videodev: Linux video capture interface: v2.00
>>      [   24.237747] ioremap error for 0x78e31000-0x78e32000, requested 0x2, got 0x0
>>      [   24.238100] ucsi_acpi: probe of USBC000:00 failed with error -12
>>      […]
>>      $ sudo more /proc/iomem
>>      […]
>>      78a04000-78ea2fff : ACPI Non-volatile Storage
>>        78e31000-78e31fff : USBC000:00
>>      […]
>>
>> This seems to happen on a lot of Dell devices, cf. bug 199741 (ioremap error
>> on Dell XPS 9370) [1].
> 
> I'm not sure if this helps, but I'm going to change the ioremap() call
> to memremap() soon in any case in this driver. Can you test the
> attached patch?

Thank you very much for the instant reply and patch. Unfortunately, the 
device is in active use by a user, so I do not think I am going to able 
able to test it. I had hoped that the Dell client Linux kernel team 
could help out, or that the Intel Linux folks have access to recent Dell 
devices internally. Maybe Kai-Heng or Hans have an idea.


Kind regards,

Paul


PS: If there is a way to test this with a QEMU VM by passing through 
some devices, I should be able to test that, as it does not involve a 
system reboot.