• Jan Kiszka's avatar
    arm64: dts: hikey: Give wifi some time after power-on · 83b94417
    Jan Kiszka authored
    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: ea452678 ("arm64: dts: hikey: Fix WiFi support")
    Cc: <stable@vger.kernel.org> #4.12+
    Signed-off-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
    Acked-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
    Signed-off-by: default avatarWei Xu <xuwei5@hisilicon.com>
    83b94417
hi6220-hikey.dts 12.8 KB