linux-kernel - [PATCH 5.4 176/232] ARM: dts: exynos: Fix polarity of the LCD SPI bus on UniversalC210 board

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Date:   Thu, 16 Apr 2020 15:24:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>
Subject: [PATCH 5.4 176/232] ARM: dts: exynos: Fix polarity of the LCD SPI bus on UniversalC210 board

From: Marek Szyprowski <m.szyprowski@...sung.com>

commit 32a1671ff8e84f0dfff3a50d4b2091d25e91f5e2 upstream.

Recent changes in the SPI core and the SPI-GPIO driver revealed that the
GPIO lines for the LD9040 LCD controller on the UniversalC210 board are
defined incorrectly. Fix the polarity for those lines to match the old
behavior and hardware requirements to fix LCD panel operation with
recent kernels.

Cc: <stable@...r.kernel.org> # 5.0.x
Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/boot/dts/exynos4210-universal_c210.dts |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/arch/arm/boot/dts/exynos4210-universal_c210.dts
+++ b/arch/arm/boot/dts/exynos4210-universal_c210.dts
@@ -115,7 +115,7 @@
 		gpio-sck = <&gpy3 1 GPIO_ACTIVE_HIGH>;
 		gpio-mosi = <&gpy3 3 GPIO_ACTIVE_HIGH>;
 		num-chipselects = <1>;
-		cs-gpios = <&gpy4 3 GPIO_ACTIVE_HIGH>;
+		cs-gpios = <&gpy4 3 GPIO_ACTIVE_LOW>;
 
 		lcd@0 {
 			compatible = "samsung,ld9040";
@@ -124,8 +124,6 @@
 			vci-supply = <&ldo17_reg>;
 			reset-gpios = <&gpy4 5 GPIO_ACTIVE_HIGH>;
 			spi-max-frequency = <1200000>;
-			spi-cpol;
-			spi-cpha;
 			power-on-delay = <10>;
 			reset-delay = <10>;
 			panel-width-mm = <90>;