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    Subject[PATCH 4.19 129/149] arm64: dts: hikey: Give wifi some time after power-on
    Date
    4.19-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Jan Kiszka <jan.kiszka@siemens.com>

    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>

    ---
    arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts | 1 +
    1 file changed, 1 insertion(+)

    --- 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>;
    };


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