Re: [PATCH v16 0/4] Introduce usb charger framework to deal with the usb gadget power negotation

From: Felipe Balbi
Date: Wed Oct 05 2016 - 03:48:07 EST

Hi Baolin,

Baolin Wang <> writes:
>>> But you do!
>>> The mA number from the USB configuration is passed to usb_gadget_vbus_draw.
>>> Your patch passes that to usb_charger_set_cur_limit_by_type()
>>> which calls __usb_charger_set_cur_limit_by_type() which will set the
>>> cur_limit for whichever type uchger->type currently is.
>>> So when it is not relevant, your code *does* set some current limit.
>> Suppose the charger type is DCP(it is not relevant to the mA number
>> from the USB configuration ), it will not do the USB enumeration, then
>> no USB configuration from host to set current.
> From the talking, there are some issues (thanks for Neil's comments)
> need to be fixed as below:
> 1. Need to add the method getting charger type from extcon subsystem.
> 2. Need to remove the method getting charger type from power supply.
> 3. There are still some different views about reporting the maximum
> current or minimum current to power driver.
> Now the current v16 patchset can work well on my Spreadtrum platform
> and Jun's NXP platform, if you like to apply this patchset then I can
> send out new patches to fix above issues. If you don't like that, I
> can send out new version patchset to fix above issues. Could you give
> me some suggestions what should I do next step? Thanks.

Merge window just opened, nothing will happen for about 2 weeks. How
about you send a new version after merge window closes and we go from
there? Fixing 1 and 2 is needed. 3 we need to consider more
carefully. Perhaps report both minimum and maximum somehow?

Neil, comments?


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