From bab3cf9d1531b6d4f67b2479cd5f51c55f418014 Mon Sep 17 00:00:00 2001 From: Jan Kiszka Date: Thu, 24 Jan 2019 09:28:59 +0100 Subject: [PATCH] arm64: dts: zcu100-revC: Give wifi some time after power-on commit 35a4f89cd4731ac6ec985cd29ddc1630903006b7 upstream. Somewhere along recent changes to power control of the wl1831, power-on became very unreliable on the Ultra96, 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, Ultra96 is already happy with 10 ms. Fixes: 5869ba0653b9 ("arm64: zynqmp: Add support for Xilinx zcu100-revC") Signed-off-by: Jan Kiszka Acked-by: Ulf Hansson Signed-off-by: Michal Simek Signed-off-by: Greg Kroah-Hartman --- arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts b/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts index 13a0a028df9858..e5699d0d91e45d 100644 --- a/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts +++ b/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts @@ -101,6 +101,7 @@ sdio_pwrseq: sdio-pwrseq { compatible = "mmc-pwrseq-simple"; reset-gpios = <&gpio 7 GPIO_ACTIVE_LOW>; /* WIFI_EN */ + post-power-on-delay-ms = <10>; }; };