15 Dec
2017
15 Dec
'17
4:48 p.m.
The PCIe reset signal is connected to GPIO4_C6 on the Puma module. This pin is supplied by 1.8V, but the default iodomain setting is 3.0V and in this situation the pin is unable to go high.
Linux assumes that this signal works in early boot as PCIe is probed before loading the iodomain driver.
Make PCIe work in Linux by setting the gpio4cd iodomain to 1.8V.
Signed-off-by: Jakob Unterwurzacher jakob.unterwurzacher@theobroma-systems.com
board/theobroma-systems/puma_rk3399/puma-rk3399.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
Acked-by: Philipp Tomsich philipp.tomsich@theobroma-systems.com