On Sun, Jan 5, 2020 at 9:24 AM Samuel Holland <[email protected]> wrote: > > Investigation on the AXP803 shows that VBUS_PLUGIN/VBUS_REMOVAL IRQs are > triggered on the rising/falling edge of AXP20X_PWR_STATUS_VBUS_USED. The > reason IRQs do not arrive while N_VBUSEN/DRIVEVBUS is high is because > AXP20X_PWR_STATUS_VBUS_USED also never goes high. > > This also means that if VBUS is online, a VBUS_REMOVAL IRQ is received > immediately on setting N_VBUSEN/DRIVEVBUS high (and VBUS_PLUGIN shortly > after it is set back low). This was also verified to be the case when > manually offlining VBUS through AXP20X_VBUS_PATH_SELECT. > > As long as VBUS is online, a present->absent transition necessarily > implies an online->offline transition. Since will cause an IRQ, there is > no need to poll while VBUS is online. > > To ensure the driver's view of VBUS online status remains accurate, > unconditionally poll once when receiving an IRQ and when resuming. If > VBUS is still online at that time, polling will cease until the next > VBUS_REMOVAL IRQ. > > Signed-off-by: Samuel Holland <[email protected]>
Reviewed-by: Chen-Yu Tsai <[email protected]> -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/CAGb2v66jxw5acPXEQd0KwVbL96dOjeTj%3D8jZsC7DFiB_-%3Di0MA%40mail.gmail.com.
