linux-kernel - [PATCH 22/22] ACPI: video: Fallback to native backlight

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Date:   Mon, 24 Oct 2022 20:35:13 +0900
From:   Akihiko Odaki <akihiko.odaki@...nix.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Jonathan Corbet <corbet@....net>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        "Lee, Chun-Yi" <jlee@...e.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Corentin Chary <corentin.chary@...il.com>,
        Cezary Jackiewicz <cezary.jackiewicz@...il.com>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        Pali Rohár <pali@...nel.org>,
        Jonathan Woithe <jwoithe@...t42.net>,
        Ike Panhc <ike.pan@...onical.com>,
        Daniel Dadap <ddadap@...dia.com>,
        Kenneth Chan <kenneth.t.chan@...il.com>,
        Mattia Dongili <malattia@...ux.it>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        Azael Avalos <coproscefalo@...il.com>,
        Lee Jones <lee@...nel.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Helge Deller <deller@....de>,
        Robert Moore <robert.moore@...el.com>,
        dri-devel@...ts.freedesktop.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        intel-gfx@...ts.freedesktop.org,
        platform-driver-x86@...r.kernel.org,
        acpi4asus-user@...ts.sourceforge.net,
        ibm-acpi-devel@...ts.sourceforge.net, linux-fbdev@...r.kernel.org,
        devel@...ica.org, Akihiko Odaki <akihiko.odaki@...nix.com>
Subject: [PATCH 22/22] ACPI: video: Fallback to native backlight

Commit 2600bfa3df99 ("ACPI: video: Add acpi_video_backlight_use_native()
helper") and following commits made native backlight unavailable if
CONFIG_ACPI_VIDEO is set and the backlight feature of ACPI video is
unavailable, which broke the backlight functionality on Lenovo ThinkPad
C13 Yoga Chromebook. Allow to fall back to native backlight in such
cases.

Signed-off-by: Akihiko Odaki <akihiko.odaki@...nix.com>
---
 drivers/acpi/video_detect.c | 4 ++--
 include/acpi/video.h        | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 88462f2fb8cc..36354241c740 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -732,8 +732,8 @@ static int __acpi_video_get_backlight_types(bool native)
 			return ACPI_BACKLIGHT_VIDEO;
 	}
 
-	/* No ACPI video (old hw), use vendor specific fw methods. */
-	return ACPI_BACKLIGHT_VENDOR;
+	/* No ACPI video, use native or vendor specific fw methods. */
+	return ACPI_BACKLIGHT_VENDOR | ACPI_BACKLIGHT_NATIVE;
 }
 
 int acpi_video_get_backlight_types(void)
diff --git a/include/acpi/video.h b/include/acpi/video.h
index 5b748fdb606e..656b59acfd1f 100644
--- a/include/acpi/video.h
+++ b/include/acpi/video.h
@@ -76,7 +76,7 @@ static inline int acpi_video_get_edid(struct acpi_device *device, int type,
 }
 static inline int acpi_video_get_backlight_types(void)
 {
-	return ACPI_BACKLIGHT_VENDOR;
+	return ACPI_BACKLIGHT_VENDOR | ACPI_BACKLIGHT_NATIVE;
 }
 static inline bool acpi_video_backlight_use_native(void)
 {
-- 
2.37.3