Change in coreboot[master]: mb/google/poppy/v/atlas: Reset bluetooth during boot

[Caveh Jalali (Code Review)]

Hello Shelley Chen, build bot (Jenkins), Furquan Shaikh, Tim Wawrzynczak, Nick Vaccaro,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/46620

to look at the new patch set (#4).

Change subject: mb/google/poppy/v/atlas: Reset bluetooth during boot
......................................................................

mb/google/poppy/v/atlas: Reset bluetooth during boot

Bluetooth is part of the Thunder Peak 2 module. This is a USB device
that is not connected to any system level reset signals. Reset is done
via a GPIO. When the SoC reboots, we need to reset Bluetooth so the
device is in a known good state. BT_DISABLE_L needs to be asserted for
a fairly long time - longer than the gap between early GPIO and main
GPIO initialization (about 170ms). So, the recently added late GPIO
init step is used to provide the necessary delay before taking the BT
chip out of reset.

BRANCH=atlas
BUG=b:168757348
TEST=Verified that we successfully reset the bluetooth chip. The quick
    way to check if the chip was reset is to look for dmesg
    entries from btusb_setup_intel_new indicating that firmware
    was downloaded right after rebooting.

Change-Id: I4c489963f7a353e8fc5f55b6cba7aaee0b347a37
Signed-off-by: Caveh Jalali 
---
M src/mainboard/google/poppy/variants/atlas/gpio.c
1 file changed, 23 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/20/46620/4