linux-kernel - [PATCH 4.20 155/171] arm64: dts: hikey: Give wifi some time after power-on

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Message-Id: <20190312170400.834409736@linuxfoundation.org>
Date:   Tue, 12 Mar 2019 10:08:55 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jan Kiszka <jan.kiszka@...mens.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Wei Xu <xuwei5@...ilicon.com>
Subject: [PATCH 4.20 155/171] arm64: dts: hikey: Give wifi some time after power-on

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jan Kiszka <jan.kiszka@...mens.com>

commit 83b944174ad79825ae84a47af1a0354485b24602 upstream.

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, the
hikey would already be happy with 1 ms. Still, we use the safer 10 ms,
like on the Ultra96.

Fixes: ea452678734e ("arm64: dts: hikey: Fix WiFi support")
Cc: <stable@...r.kernel.org> #4.12+
Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
Acked-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Wei Xu <xuwei5@...ilicon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
+++ b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
@@ -118,6 +118,7 @@
 		reset-gpios = <&gpio0 5 GPIO_ACTIVE_LOW>;
 		clocks = <&pmic>;
 		clock-names = "ext_clock";
+		post-power-on-delay-ms = <10>;
 		power-off-delay-us = <10>;
 	};