queue-5.0/arm64-dts-hikey-give-wifi-some-time-after-power-on.patch

   1 From 83b944174ad79825ae84a47af1a0354485b24602 Mon Sep 17 00:00:00 2001
   2 From: Jan Kiszka <jan.kiszka@siemens.com>
   3 Date: Thu, 24 Jan 2019 08:52:33 +0100
   4 Subject: arm64: dts: hikey: Give wifi some time after power-on
   5
   6 From: Jan Kiszka <jan.kiszka@siemens.com>
   7
   8 commit 83b944174ad79825ae84a47af1a0354485b24602 upstream.
   9
  10 Somewhere along recent changes to power control of the wl1835, power-on
  11 became very unreliable on the hikey, failing like this:
  12
  13 wl1271_sdio: probe of mmc2:0001:1 failed with error -16
  14 wl1271_sdio: probe of mmc2:0001:2 failed with error -16
  15
  16 After playing with some dt parameters and comparing to other users of
  17 this chip, it turned out we need some power-on delay to make things
  18 stable again. In contrast to those other users which define 200 ms, the
  19 hikey would already be happy with 1 ms. Still, we use the safer 10 ms,
  20 like on the Ultra96.
  21
  22 Fixes: ea452678734e ("arm64: dts: hikey: Fix WiFi support")
  23 Cc: <stable@vger.kernel.org> #4.12+
  24 Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
  25 Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
  26 Signed-off-by: Wei Xu <xuwei5@hisilicon.com>
  27 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  28
  29 ---
  30  arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts |    1 +
  31  1 file changed, 1 insertion(+)
  32
  33 --- a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
  34 +++ b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
  35 @@ -118,6 +118,7 @@
  36                 reset-gpios = <&gpio0 5 GPIO_ACTIVE_LOW>;
  37                 clocks = <&pmic>;
  38                 clock-names = "ext_clock";
  39 +               post-power-on-delay-ms = <10>;
  40                 power-off-delay-us = <10>;
  41         };
  42