| From 83b944174ad79825ae84a47af1a0354485b24602 Mon Sep 17 00:00:00 2001 |
| From: Jan Kiszka <jan.kiszka@siemens.com> |
| Date: Thu, 24 Jan 2019 08:52:33 +0100 |
| Subject: arm64: dts: hikey: Give wifi some time after power-on |
| |
| 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>; |
| }; |
| |
