linux-kernel - [PATCH 4.19 23/44] ARM: dts: bcm2837: Fix polarity of wifi reset GPIOs

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Date:   Tue, 18 Dec 2018 17:39:35 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Matthias Lueschner <lueschem@...il.com>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Eric Anholt <eric@...olt.net>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH 4.19 23/44] ARM: dts: bcm2837: Fix polarity of wifi reset GPIOs

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

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

From: Stefan Wahren <stefan.wahren@...e.com>

commit e25b6783c7b1bb79103d4617336879423f86b05e upstream.

The commit b1b8f45b3130 ("ARM: dts: bcm2837: Add missing GPIOs of Expander")
introduced a wifi power sequence. Unfortunately the polarity of the reset
GPIOs were wrong and broke the wifi support on Raspberry Pi 3 B and
later in 3 B+. This wasn't discovered before since the power sequence
takes only effect in case the relevant MMC driver is compiled as a module.

Fixes: b1b8f45b3130 ("ARM: dts: bcm2837: Add missing GPIOs of Expander")
Cc: stable@...r.kernel.org
Reported-by: Matthias Lueschner <lueschem@...il.com>
Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=911443
Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
Reviewed-by: Eric Anholt <eric@...olt.net>
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/boot/dts/bcm2837-rpi-3-b-plus.dts |    2 +-
 arch/arm/boot/dts/bcm2837-rpi-3-b.dts      |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/arch/arm/boot/dts/bcm2837-rpi-3-b-plus.dts
+++ b/arch/arm/boot/dts/bcm2837-rpi-3-b-plus.dts
@@ -31,7 +31,7 @@
 
 	wifi_pwrseq: wifi-pwrseq {
 		compatible = "mmc-pwrseq-simple";
-		reset-gpios = <&expgpio 1 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&expgpio 1 GPIO_ACTIVE_LOW>;
 	};
 };
 
--- a/arch/arm/boot/dts/bcm2837-rpi-3-b.dts
+++ b/arch/arm/boot/dts/bcm2837-rpi-3-b.dts
@@ -26,7 +26,7 @@
 
 	wifi_pwrseq: wifi-pwrseq {
 		compatible = "mmc-pwrseq-simple";
-		reset-gpios = <&expgpio 1 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&expgpio 1 GPIO_ACTIVE_LOW>;
 	};
 };