[PATCH v3 0/9] Tegra xHCI support

[Andrew Bresticker]

On Tue, Sep 16, 2014 at 9:57 AM, Andrew Bresticker
<abrestic at chromium.org> wrote:
> On Tue, Sep 16, 2014 at 8:26 AM, Stephen Warren <swarren at wwwdotorg.org> wrote:
>> On 09/15/2014 01:30 PM, Andrew Bresticker wrote:
>>>
>>> On Mon, Sep 15, 2014 at 11:09 AM, Stephen Warren <swarren at wwwdotorg.org>
>>> wrote:
>>>>
>>>> On 09/15/2014 11:06 AM, Andrew Bresticker wrote:
>>>>>
>>>>> On Mon, Sep 15, 2014 at 12:00 AM, Tomeu Vizoso <tomeu at tomeuvizoso.net>
>>>>> wrote:
>>>>>>
>>>>>> On 12 September 2014 18:37, Andrew Bresticker <abrestic at chromium.org>
>>>>>> wrote:
>>>>>>>
>>>>>>> On Tue, Sep 9, 2014 at 1:21 AM, Tomeu Vizoso <tomeu at tomeuvizoso.net>
>>>>>>> wrote:
>>>>>>>>
>>>>>>>> On 8 September 2014 18:22, Andrew Bresticker <abrestic at chromium.org>
>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>> On Mon, Sep 8, 2014 at 8:34 AM, Tomeu Vizoso <tomeu at tomeuvizoso.net>
>>>>>>>>> wrote:
>>>>>>>>>>
>>>>>>>>>> On 2 September 2014 23:34, Andrew Bresticker
>>>>>>>>>> <abrestic at chromium.org> wrote:
>>>>>>>>>>>
>>>>>>>>>>> Tested on Venice2, Jetson TK1, and Big with a variety of USB2.0
>>>>>>>>>>> and
>>>>>>>>>>> USB3.0 memory sticks and ethernet dongles using controller
>>>>>>>>>>> firmware
>>>>>>>>>>> recently posted by Andrew Chew [2].
>>
>> ...
>>>>>
>>>>> Stephen, Thierry, have either of you had a chance to test this series?
>>>>
>>>>
>>>> I haven't had a chance to yet. I just went to try it out, and found that
>>>> it
>>>> depends on a whole slew of other patches that I don't have. Is there a
>>>> git
>>>> branch somewhere to save me having to track down all the dependencies?
>>>
>>>
>>> Yes, Tomeu has the branch he used for testing here:
>>> http://cgit.collabora.com/git/user/tomeu/linux.git/log/?h=3.17rc4-xhci
>>
>>
>> Hmm. That git server was quite reluctant to cough up its bits, but it did
>> eventually.
>>
>>> You'll also need the firmware Andrew Chew posted:
>>> https://patchwork.ozlabs.org/patch/384013/
>>
>>
>> The XHCI driver can't load its firmware unless it's a module; if I make it
>> built-in, it fails immediately with error -2 during "Direct firmware
>> loading". The driver needs to work with either immediate or deferred
>> firmware loading.
>
> If you want the driver to be built-in, you'll either need to build the
> firmware in as well (i.e. EXTRA_FIRMWARE) or enable
> FW_LOADER_USER_HELPER_FALLBACK to load with userspace/uevent (though
> apparently this is deprecated).
>
>> The following USB2 devices had problems:
>>
>> 0b95:7720 ASIX Electronics Corp. AX88772
>>
>>> [  489.140536] usb 1-3: new high-speed USB device number 81 using
>>> xhci-tegra
>>> [  489.260860] usb 1-3: device descriptor read/64, error -71
>>> [  489.370804] xhci-tegra 70090000.usb: Setup ERROR: setup context command
>>> for slot 1.
>>> [  489.378463] usb 1-3: hub failed to enable device, error -22
>>> [  489.500531] usb 1-3: new high-speed USB device number 82 using
>>> xhci-tegra
>>> [  489.655708] usb 1-3: can't set config #1, error -71
>>> [  489.661231] usb 1-3: USB disconnect, device number 82
>>> [  489.940531] usb 1-3: new high-speed USB device number 83 using
>>> xhci-tegra
>>> [  490.060860] usb 1-3: device descriptor read/64, error -71
>>> [  490.170805] xhci-tegra 70090000.usb: Setup ERROR: setup context command
>>> for slot 1.
>>> [  490.178462] usb 1-3: hub failed to enable device, error -22
>>
>> (repeats over and over)
>>
>> 15a4:1336 Afatech Technologies, Inc. SDHC/MicroSD/MMC/MS/M2/CF/XD Flash Card
>> Reader
>>
>> The power light comes on, and the activity light just keeps flashing fast.
>> Usually the activity light flashes a couple times and then turns off. There
>> is nothing in dmesg at all for this device.
>>
>> 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
>>
>> Not detected. There is nothing in dmesg at all for this device.
>>
>> 1bcf:0c31 Sunplus Innovation Technology Inc. SPIF30x Serial-ATA bridge
>>
>> Not detected. There is nothing in dmesg at all for this device.
>
> Thanks, I'll try to figure out what's going on here.

Grr... this is due to the unfortunate UTMI pad controller design on Tegra.

Here's the issue:  When UTMI pad 0 is assigned to the EHCI controller
(as is currently the case on Jetson-TK1), the UTMI parameters from
UTMIP_BIAS_CFG0 in the global UTMI pad register space are used
regardless of the owner of the UTMI pads.  If pad 0 is assigned to the
XUSB controller, then parameters in USB2_BIAS_PAD_CTL0 in the XUSB
register space are used for all UTMI pads (again, regardless of
ownership).

I wasn't able to reproduce before because I always TFTP booted and
U-Boot programs the UTMI parameters correctly when starting the EHCI
controllers.  I suspect you and Tomeu were booting without starting
the EHCI controllers and thus were stuck with the POR values.

The easiest way to fix this is to just assign UTMI port 0 (i.e. the
OTG port) to the XUSB controller.  AFAIK, device mode on Tegra isn't
supported yet in the kernel, so this shouldn't break any existing use
cases.  If we wanted to support device mode in the future, it would
just have to be done with the XUSB controller instead.  The
alternative is some ugly driver that programs the correct register set
depending on which controller UTMI port 0 is assigned to.

BTW, here's a patch to assign UTMI port 0 to XUSB:

diff --git a/arch/arm/boot/dts/tegra124-jetson-tk1.dts
b/arch/arm/boot/dts/tegra124-jetson-tk1.dts
index a473750..dacb0d0 100644
--- a/arch/arm/boot/dts/tegra124-jetson-tk1.dts
+++ b/arch/arm/boot/dts/tegra124-jetson-tk1.dts
@@ -1644,7 +1644,7 @@

                padctl_default: pinmux {
                        otg {
-                               nvidia,lanes = "otg-1", "otg-2";
+                               nvidia,lanes = "otg-0", "otg-1", "otg-2";
                                nvidia,function = "xusb";
                        };