[linux-sunxi] [PATCH] musb: sunxi: Ignore VBus errors in host-only mode

Hi,

On Thu, May 11, 2017 at 02:45:11PM -0700, Bim Overbohm wrote:

Hi All,

I had a similar problem running a mainline 4.11 kernel on an A33 tablet 
(marked "Q8-2.4G 20140918". It came from a company called Trimeo and is 
simply called 7". It contains an APX223 power controller, RTL8189ETV WiFi 
controller, 2x Nanya NT5CB128M15FP-DY DRAM chips (2x256MB), a Hynix 
H27UCG8T2BTR-BC NAND-flash chip and a Goodix GT818 touch controller. 
Display resolution is 1024x600). The self-compiled u-boot dtb would 
initialize the USB, but the kernel dtb would not work.

U-Boot doesn't use the DT for this USB setup.

The kernel messages were something along the lines of "[ 9.366994]
sun4i-usb-phy 1c19400.phy: could not find pctldev for node
/soc at 01c00000/pinctrl at 01c20800/usb0_id_detect_pin at 0, deferring
probe".

That's not likely to be your issue. The probe should be deferred, and
reattempted later.

I found no way to activate the pinctrl devices, so I fixed this by
decompiling the dts, removing all the USB id detect pin and vbus
settings and recompiling the dts (diff at end of message). The
device boots into LXDE now and I can use an USB keyboard and
mouse. I still have no WiFi though...

Pastebin of unpatched dts file: https://pastebin.com/kL6WELuC

A couple of questions:

- Is there a proper way to make the pinctrls and OTG dual mode work
  on the device?! I suspect they are needed to activate WiFi too...

As I said, that's probably not your issue. Are you sure of your
micro-USB cable? Is it setting the ID pin to the ground as it's
supposed to?

- Is this a bug I should report for sunxi-next?

sunxi-next is just a merge of various upstream branches. It doesn't
make sense to report bugs there. You've found the right place already.

- Is there a driver for the GT818 in the mainline kernel or a way to
  make that device work?

It doesn't look like there is.

- Is there a driver for the RTL8189ETV in the mainline kernel or a way to 
make that device work?

https://linux-sunxi.org/Wifi#RTL8189ES_.2F_RTL8189ETV

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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