Adding a few folks to cc from the thread here: https://patchwork.kernel.org/patch/10734021/ As this sounds like a very similar issue. thanks -john On Sun, Dec 30, 2018 at 3:38 AM Jan Kiszka <jan.kiszka@xxxxxx> wrote: > > From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx> > > 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 is already very happy with 1 ms. > > Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx> > --- > > Tested with 4.19 and linus/master. > > arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts > b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts > index f4964bee6a1a..1e771bf201b9 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 = <1>; > power-off-delay-us = <10>; > }; > > -- > 2.16.4
