Thanks for the quick response Peter. I am powering the board from the
host, so VBUS is on as long as the device is powered. In this case
extcon doesn't apply. But it's a nice option if alternative power is
provided.
This is not a commercial project, I am using a hacked WR-703N router,
so certification is not on the table.
Regards,
Svet.
2016-03-28 5:38 GMT+03:00 Peter Chen <hzpeterchen@xxxxxxxxx>:
> On Sat, Mar 26, 2016 at 06:57:26PM +0200, Svetoslav Neykov wrote:
>> I'm trying to use the chipidea driver in device mode on an AR9331 SOC board.
>> I've got it mostly working but can't figure out how to enable vbus_active.
>> Some details - the system supports both host & device modes, but not OTG.
>> The mode is selected at startup and there are no OTG registers exposed. Also
>> no ID & VBUS pins are available - vbus is considered active all the time
>> (when in device mode).
>> Here's the excerpt from the ci_hdrc_platform_data init I've got so far:
>>
>> ci_pdata.name = "ci_hdrc_ar933x";
>> ci_pdata.capoffset = DEF_CAPOFFSET;
>> ci_pdata.dr_mode = dr_mode;
>> ci_pdata.flags = CI_HDRC_DUAL_ROLE_NOT_OTG;
>> ci_pdata.vbus_extcon.edev = ERR_PTR(-ENODEV);
>> ci_pdata.id_extcon.edev = ERR_PTR(-ENODEV);
>> ci_pdata.itc_setting = 1;
>>
>> phy = usb_phy_generic_register();
>>
>> ath79_usb_register("ci_hdrc", -1,
>> AR933X_EHCI_BASE, AR933X_EHCI_SIZE,
>> ATH79_CPU_IRQ(3),
>> &ci_pdata, sizeof(ci_pdata));
>>
>>
>> Browsing the commit history and current code it seems that the way to go is
>> registering a (simulated) vbus_extcon device with ci_handle_vbus_change then
>> making the switch. It doesn't work for this particular system because it
>> doesn't have OTG registers and ci->is_otg is false. Any pointers how to set
>> vbus_active appreciated. It used to work around 3.11, but the code changed
>> considerably since then.
>
> Hi Svetoslav,
>
> Current vbus/id handler does not consider your case, do you use extcon for
> vbus detection? If not, how do you plan to handle disconnection? And the USB
> certification test will fail if dp is always on?
>
> I will re-design it, and keep you on cc.
>
> --
> Best Regards,
> Peter Chen
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