diff options
| author | Jan Kiszka <jan.kiszka@siemens.com> | 2019-01-24 09:28:59 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-13 14:02:39 -0700 |
| commit | 271c5a5d546ba6daecf101d6cf89ea162f2a1e1d (patch) | |
| tree | cdb624eb037771e42c7d82875e14ca3d6a5a16a9 | |
| parent | 36e3673d01af4438464e2d366cfedd7f7d42ee0a (diff) | |
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 <jan.kiszka@siemens.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts b/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts index eb5e8bddb610..8954c8c6f547 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>; }; }; |