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arm64: dts: hikey: Give wifi some time after power-on

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Somewhere along recent changes to power control of the wl1835, power-on
became very unreliable on the hikey, 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, the
hikey would already be happy with 1 ms. Still, we use the safer 10 ms,
like on the Ultra96.

Fixes: ea45267873 ("arm64: dts: hikey: Fix WiFi support")
Cc: <stable@vger.kernel.org> #4.12+
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>
This commit is contained in:
Jan Kiszka 2019-01-24 08:52:33 +01:00 committed by Wei Xu
parent ae4eba8365
commit 83b944174a
1 changed files with 1 additions and 0 deletions
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arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
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@ -118,6 +118,7 @@ wl1835_pwrseq: wl1835-pwrseq {
reset-gpios = <&gpio0 5 GPIO_ACTIVE_LOW>;
clocks = <&pmic>;
clock-names = "ext_clock";
post-power-on-delay-ms = <10>;
power-off-delay-us = <10>;
};