From: Jan Kiszka jan.kiszka@siemens.com
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 jan.kiszka@siemens.com Acked-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Michal Simek michal.simek@xilinx.com ---
arch/arm/dts/zynqmp-zcu100-revC.dts | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/arm/dts/zynqmp-zcu100-revC.dts b/arch/arm/dts/zynqmp-zcu100-revC.dts index 02573a1f3294..986f50cf323d 100644 --- a/arch/arm/dts/zynqmp-zcu100-revC.dts +++ b/arch/arm/dts/zynqmp-zcu100-revC.dts @@ -123,6 +123,7 @@ sdio_pwrseq: sdio-pwrseq { compatible = "mmc-pwrseq-simple"; reset-gpios = <&gpio 7 GPIO_ACTIVE_LOW>; /* WIFI_EN */ + post-power-on-delay-ms = <10>; };
ina226 {