Re: OMAP3430: MUSB host and hot-plugging

[Kevin Hilman <khilman@mvista.com>]

"Pandita, Vikram" <vikram.pandita@ti.com> writes:

> Felipe
>
>>Sent: Thursday, March 20, 2008 6:09 PM
>>To: Pandita, Vikram
>>Cc: Kevin Hilman; Linux omap
>>Subject: RE: OMAP3430: MUSB host and hot-plugging
>>
>>
>>> If you can provide us the procedure to enable hot-plugging for MUSB on
>>> OMAP3430, we will look into this issue.
>>
>>As far as musb driver is concerned it should be just a mater of
>>building it with otg support. But as of now, I cannot get id
>>pin status to musb using twl4030.
>>
>>Maybe we still have some missing pieces on linux-omap, which I'm
>>researching on that.
>
>
>  I meant if you could pass on how you have written the hot plugging
> function/agent for MUSB.  I have not tried hot-plugging on omap.

There's no additional code.  You can reproduce this with current OMAP
git, and default omap_3430sdp_defconfig, which enables MUSB in OTG
mode.

Here's what I do:

- plug in cable (mini-A to A-female)
- boot
- after booting, plug in USB storage device.
  on my userland, hotplug does its thing, and the usb/scsi storage modules
  are loaded, and I can then access /dev/sda* 
- unplug USB key.
  kernel msgs show the disconnect happens etc.

- replug USB key --- nothing happens

- echo 'F' > /proc/driver/musb_hdrc

  USB key is detected and 'CONNECT' event happens, and I can then
  access /dev/sda* again.


Kevin