[Letux-kernel] gta04a5 + bluetooth + letux = mysterious things ahead

H. Nikolaus Schaller hns at goldelico.com
Sun Nov 4 19:40:48 CET 2018

> Am 04.11.2018 um 15:18 schrieb Andreas Kemnade <andreas at kemnade.info>:
> Hi,
> I am wondering about bluetooth behavior on a5:
> - Suspend current decrease by 6mA (I have seen 12mA suspend without
>  modem): my doing the following steps
>   1. booting without bluetoothd, module autoloading, no uart idling
>   2. hciconfig hci0 up (it is still down)
>   3. rmmod hci_uart
>   4. suspend
>  To clarify 6mA lower than without modules.
> - wlan screws up when hci_uart is removed and a certain set of things
>  is idled. I have not fully evaluated this.
>  Required:
>    allowing bluetooth uart to suspend
>  echo 3000
>> /sys/bus/platform/drivers/omap_uart/4806a000.serial/power/autosuspend_delay_ms
>  Definitively not required:
>    allowing gps uart to suspend, gps can be active. Their modules
>    clocks depend on the same clocks.
>  sdcard access still works.
>  To recover wifi you have to unbind and rebind omap_hsmmc via sysfs.

Hm. Maybe they share some clock?

> What is the situation on Pyra?

Well, we can't test suspend power there yet... Too many unknown influences.

> Regards,
> Andreas
> PS: I still have the sound fm stuff blacklisted



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