linux-kernel - [PATCH 1/3] backlight: always select BACKLIGHT_LCD_SUPPORT for BACKLIGHT_CLASS

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Date:   Wed, 26 Jul 2017 15:53:10 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     dri-devel@...ts.freedesktop.org
Cc:     Arnd Bergmann <arnd@...db.de>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Lucas Stach <l.stach@...gutronix.de>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Jens Frederich <jfrederich@...il.com>,
        Daniel Drake <dsd@...top.org>,
        Jon Nettleton <jon.nettleton@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        etnaviv@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, platform-driver-x86@...r.kernel.org,
        devel@...verdev.osuosl.org
Subject: [PATCH 1/3] backlight: always select BACKLIGHT_LCD_SUPPORT for BACKLIGHT_CLASS_DEVICE

randconfig builds occasionally produce this Kconfig warning:

warning: (DRM_RADEON && DRM_AMDGPU && DRM_NOUVEAU && DRM_I915 && DRM_GMA500 && DRM_SHMOBILE && DRM_TILCDC && DRM_FSL_DCU && DRM_TINYDRM && DRM_PARADE_PS8622 && FB_BACKLIGHT && FB_ARMCLCD && FB_MX3 && USB_APPLEDISPLAY && FB_OLPC_DCON && ACPI_CMPC && SAMSUNG_Q10) selects BACKLIGHT_CLASS_DEVICE which has unmet direct dependencies (HAS_IOMEM && BACKLIGHT_LCD_SUPPORT)

It turns out that amost all users of BACKLIGHT_CLASS_DEVICE also select
BACKLIGHT_LCD_SUPPORT, but not all of them do. This makes the remaining
ones behave like the others.

It would probably be best to rework the way those two options related
entirely, but for now this takes the simpler and safer approach to
fix the warnings without introducing regressions.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpu/drm/gma500/Kconfig    | 1 +
 drivers/platform/x86/Kconfig      | 2 ++
 drivers/staging/olpc_dcon/Kconfig | 1 +
 3 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/gma500/Kconfig b/drivers/gpu/drm/gma500/Kconfig
index df11582f1efc..52d855cb0569 100644
--- a/drivers/gpu/drm/gma500/Kconfig
+++ b/drivers/gpu/drm/gma500/Kconfig
@@ -6,6 +6,7 @@ config DRM_GMA500
 	# GMA500 depends on ACPI_VIDEO when ACPI is enabled, just like i915
 	select ACPI_VIDEO if ACPI
 	select BACKLIGHT_CLASS_DEVICE if ACPI
+	select BACKLIGHT_LCD_SUPPORT if ACPI
 	select INPUT if ACPI
 	help
 	  Say yes for an experimental 2D KMS framebuffer driver for the
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 80b87954f6dd..e0ca673bf564 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -785,6 +785,7 @@ config ACPI_CMPC
 	depends on RFKILL || RFKILL=n
 	select INPUT
 	select BACKLIGHT_CLASS_DEVICE
+	select BACKLIGHT_LCD_SUPPORT
 	default n
 	help
 	  Support for Intel Classmate PC ACPI devices, including some
@@ -1000,6 +1001,7 @@ config SAMSUNG_Q10
 	tristate "Samsung Q10 Extras"
 	depends on ACPI
 	select BACKLIGHT_CLASS_DEVICE
+	select BACKLIGHT_LCD_SUPPORT
 	---help---
 	  This driver provides support for backlight control on Samsung Q10
 	  and related laptops, including Dell Latitude X200.
diff --git a/drivers/staging/olpc_dcon/Kconfig b/drivers/staging/olpc_dcon/Kconfig
index d277f048789e..845f756886f0 100644
--- a/drivers/staging/olpc_dcon/Kconfig
+++ b/drivers/staging/olpc_dcon/Kconfig
@@ -4,6 +4,7 @@ config FB_OLPC_DCON
 	depends on I2C
 	depends on (GPIO_CS5535 || GPIO_CS5535=n)
 	select BACKLIGHT_CLASS_DEVICE
+	select BACKLIGHT_LCD_SUPPORT
 	---help---
 	  In order to support very low power operation, the XO laptop uses a
 	  secondary Display CONtroller, or DCON.  This secondary controller
-- 
2.9.0