Messages in this thread Patch in this message | | | From | Jan Kiszka <> | Subject | [PATCH] arm64: dts: zcu100-revC: Give wifi some time after power-on | Date | Thu, 24 Jan 2019 08:54:18 +0100 |
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From: Jan Kiszka <jan.kiszka@siemens.com>
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, Ultra96 is already happy with 10 ms.
Fixes: ea452678734e ("arm64: dts: hikey: Fix WiFi support") Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> --- 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 13a0a028df98..e5699d0d91e4 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>; }; };
-- 2.16.4
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