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>>>>> -    else >>>>> -        phy_set_mode_ext(phy, PHY_MODE_USB_OTG, USB_ROLE_NONE); >>>>> +    if (tegra->host_mode) { >>>>> +        if (!tegra_xusb_usb2_port_wait_role_none(tegra->padctl, >>>>> +                             tegra->otg_usb2_port)) >>>>> +            return; >>>>> +        role = USB_ROLE_HOST; >>>>> +    } >>>>> + >>>>> +    mutex_lock(&tegra->lock); >>>>> +    phy_set_mode_ext(phy, PHY_MODE_USB_OTG, role); >>>>>       mutex_unlock(&tegra->lock); >>>> >>>> I am trying to understand why you opted to implement it this way >>>> around and not add the wait loop after setting to the mode to >>>> USB_ROLE_NONE in the original code all within the context of the mutex? >>> >>> I did that to minimize the amount of time we wait while holding the >>> mutex, as we can now possibly wait a significant amount of time for the >>> role switch. Is this an unneccessary optimization? >> >> Do you mean it will be longer than a few 100us? > > Currently the worst case in wait_role_none() is around 300us but again > this is simply because I chose the values with no criteria except that > in my testing they have worked thus far. Do you have access to any > internal documentation where the transition length is documented? > > In any case I think that the underlying principle of minimizing the time > we hold the mutex is solid, no? Yes, but it was unclear to me if there could be a case where we are waiting for USB_ROLE_NONE but we have already transitioned to host. May be that will never happen, but it was not clear. Jon -- nvpublic