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Date: Fri,  2 Feb 2024 10:43:00 +0100
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Cc: Marek Szyprowski <m.szyprowski@...sung.com>, Russell King
	<linux@...linux.org.uk>, Arnd Bergmann <arnd@...db.de>, Geert Uytterhoeven
	<geert+renesas@...der.be>, Krzysztof Kozlowski
	<krzysztof.kozlowski@...aro.org>, Alexandre Torgue
	<alexandre.torgue@...s.st.com>, Andrew Davis <afd@...com>, Mark Brown
	<broonie@...nel.org>, Lee Jones <lee@...nel.org>, Daniel Thompson
	<daniel.thompson@...aro.org>, Jingoo Han <jingoohan1@...il.com>, David
	Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
Subject: 

Subject: [PATCH] ARM: multi_v7_defconfig: Enable BACKLIGHT_CLASS_DEVICE

Commit 72fee6b0a3a4 ("fbdev: Restrict FB_SH_MOBILE_LCDC to SuperH")
disabled availablity of the SH_MOBILE_LCDC driver on the RENESAS arch.
This innocent change has a significant side-effect on the ARM's
multi_v7_defconfig, because FB_BACKLIGHT symbol is no longer selected,
what in turn leaves BACKLIGHT_CLASS_DEVICE symbol selected only as
a module. The latter disables some backlight related code in the DRM
core, because the DRM core is set to be compiled-in in this defconfig.
This leaves all DRM display panels without integrated backlight control,
even if the needed modules have been properly loaded and probed.

Fix this by selecting BACKLIGHT_CLASS_DEVICE to be compiled-in in
multi_v7_defconfig.

Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
 arch/arm/configs/multi_v7_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/configs/multi_v7_defconfig b/arch/arm/configs/multi_v7_defconfig
index 8f7445729cd0..b2955dcb5a53 100644
--- a/arch/arm/configs/multi_v7_defconfig
+++ b/arch/arm/configs/multi_v7_defconfig
@@ -777,6 +777,7 @@ CONFIG_FB_EFI=y
 CONFIG_FB_WM8505=y
 CONFIG_FB_SH_MOBILE_LCDC=y
 CONFIG_FB_SIMPLE=y
+CONFIG_BACKLIGHT_CLASS_DEVICE=y
 CONFIG_BACKLIGHT_PWM=y
 CONFIG_BACKLIGHT_AS3711=y
 CONFIG_BACKLIGHT_GPIO=y
-- 
2.34.1