On Wed, 2 Jan 2019 at 23:21, John Stultz <john.stultz@xxxxxxxxxx> wrote: > > 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 John, thanks for looping me in. > > 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. According to the discussions we had so far, this doesn't sound like the correct solution. I am intending to post patch soon, however, I am not sure exactly what solution to pick yet. I will keep you on cc - and of course I appreciate if you could help to test. Kind regards Uffe > > > > 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
