arm64: dts: zcu100-revC: Give wifi some time after power-on
authorJan Kiszka <jan.kiszka@siemens.com>
Thu, 24 Jan 2019 08:28:59 +0000 (09:28 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 13 Mar 2019 21:02:39 +0000 (14:02 -0700)
commit271c5a5d546ba6daecf101d6cf89ea162f2a1e1d
treecdb624eb037771e42c7d82875e14ca3d6a5a16a9
parent36e3673d01af4438464e2d366cfedd7f7d42ee0a
arm64: dts: zcu100-revC: Give wifi some time after power-on

commit 35a4f89cd4731ac6ec985cd29ddc1630903006b7 upstream.

Somewhere along recent changes to power control of the wl1831, power-on
became very unreliable on the Ultra96, failing like this:

wl1271_sdio: probe of mmc2:0001:1 failed with error -16
wl1271_sdio: probe of mmc2:0001:2 failed with error -16

After playing with some dt parameters and comparing to other users of
this chip, it turned out we need some power-on delay to make things
stable again. In contrast to those other users which define 200 ms,
Ultra96 is already happy with 10 ms.

Fixes: 5869ba0653b9 ("arm64: zynqmp: Add support for Xilinx zcu100-revC")
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts