| From 35a4f89cd4731ac6ec985cd29ddc1630903006b7 Mon Sep 17 00:00:00 2001 |
| From: Jan Kiszka <jan.kiszka@siemens.com> |
| Date: Thu, 24 Jan 2019 09:28:59 +0100 |
| Subject: arm64: dts: zcu100-revC: Give wifi some time after power-on |
| |
| From: Jan Kiszka <jan.kiszka@siemens.com> |
| |
| 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> |
| |
| --- |
| arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts | 1 + |
| 1 file changed, 1 insertion(+) |
| |
| --- 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>; |
| }; |
| }; |
| |
