Re: [PATCH v2] mx8mm: usb: chipidea: Fix Battery Charger 1.2 CDP detection

[Breno Matheus Lima]

Hi Peter,

Em sáb., 12 de jun. de 2021 às 03:24, Peter Chen
<peter.chen@xxxxxxxxxx> escreveu:
>
> On 21-06-11 10:56:07, Breno Lima wrote:
> > i.MX8MM cannot detect certain CDP USB HUBs. usbmisc_imx.c driver is not
> > following CDP timing requirements defined by USB BC 1.2 specification
> > and section 3.2.4 Detection Timing CDP.
> >
> > During Primary Detection the i.MX device should turn on VDP_SRC and
> > IDM_SINK for a minimum of 40ms (TVDPSRC_ON). After a time of TVDPSRC_ON,
> > the PD is allowed to check the status of the D- line. Current
> > implementation is waiting between 1ms and 2ms, and certain BC 1.2
> > complaint USB HUBs cannot be detected. Increase delay to 40ms allowing
> > enough time for primary detection.
> >
> > During secondary detection the PD is required to disable VDP_SRC and
>
> What does the "PD" mean here?
>

PD stands for Portable Device, I can send another version and mention
i.MX instead.

Thanks for pointing this out.

Best regards,
Breno Lima