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| author | Jan Kiszka <jan.kiszka@siemens.com> | 2019-01-24 08:52:33 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-13 14:03:22 -0700 |
| commit | c238ab2fb928b40d8af691b24628ca512e1c62e4 (patch) | |
| tree | 905d0642bae73418100e3516bfa8b5f79ea25b55 | |
| parent | 0472ddf81d02c85d480b470d749599094aaa1bde (diff) | |
| download | linux-c238ab2fb928b40d8af691b24628ca512e1c62e4.tar.gz linux-c238ab2fb928b40d8af691b24628ca512e1c62e4.tar.bz2 linux-c238ab2fb928b40d8af691b24628ca512e1c62e4.zip | |
arm64: dts: hikey: Give wifi some time after power-on
commit 83b944174ad79825ae84a47af1a0354485b24602 upstream.
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: ea452678734e ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts index 3aee6123d161..6887cc1a743d 100644 --- a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts +++ b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts @@ -118,6 +118,7 @@ reset-gpios = <&gpio0 5 GPIO_ACTIVE_LOW>; clocks = <&pmic>; clock-names = "ext_clock"; + post-power-on-delay-ms = <10>; power-off-delay-us = <10>; }; |