Re: [PATCH v2] extcon-intel-cht-wc: Don't reset USB data connection at probe

Andy Shevchenko
2019-09-17T11:13:27Z

On Tue, Sep 17, 2019 at 12:15:36AM +0300, Yauhen Kharuzhy wrote:
> Intel Cherry Trail Whiskey Cove extcon driver connect USB data lines to
> PMIC at driver probing for further charger detection. This causes reset of
> USB data sessions and removing all devices from bus. If system was
> booted from Live CD or USB dongle, this makes system unusable.
>
> Check if USB ID pin is floating and re-route data lines in this case
> only, don't touch otherwise.

> + ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_STS, &pwrsrc_sts);
> + if (ret) {
> + dev_err(ext->dev, "Error reading pwrsrc status: %d\n", ret);
> + goto disable_sw_control;
> + }
> +
> + id = cht_wc_extcon_get_id(ext, pwrsrc_sts);

We have second implementation of this. Would it make sense to split to some
helper?

> + /* If no USB host or device connected, route D+ and D- to PMIC for
> + * initial charger detection
> + */

I'm not sure it's acceptable style of multi-line comment, but it's up to
maintainer.

> + if (id != INTEL_USB_ID_GND)
> + cht_wc_extcon_set_phymux(ext, MUX_SEL_PMIC);
>
> /* Get initial state */
> cht_wc_extcon_pwrsrc_event(ext);
> --
> 2.23.0.rc1
>

--
With Best Regards,
Andy Shevchenko