linux-kernel - [PATCH] platform/x86: dell-laptop: Add drm module soft dependency

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Message-Id: <20230607034331.576623-1-acelan.kao@canonical.com>
Date:   Wed,  7 Jun 2023 11:43:31 +0800
From:   AceLan Kao <acelan.kao@...onical.com>
To:     Matthew Garrett <mjg59@...f.ucam.org>,
        Pali Rohár <pali@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] platform/x86: dell-laptop: Add drm module soft dependency

From: "Chia-Lin Kao (AceLan)" <acelan.kao@...onical.com>

dell_laptop is somethines loaded before nvidia driver, causing it to
create its own backlight interface before native backlight is set.
This results in the presence of 2 backlight interfaces in sysfs and
leads to the backlight can't be adjusted.
To work around this issue, delaying the loading of dell_laptop until
after drm module has been loaded.

Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao@...onical.com>
---
 drivers/platform/x86/dell/dell-laptop.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/platform/x86/dell/dell-laptop.c b/drivers/platform/x86/dell/dell-laptop.c
index 1321687d923e..535e6c3df529 100644
--- a/drivers/platform/x86/dell/dell-laptop.c
+++ b/drivers/platform/x86/dell/dell-laptop.c
@@ -2316,6 +2316,7 @@ static void __exit dell_exit(void)
 late_initcall(dell_init);
 module_exit(dell_exit);
 
+MODULE_SOFTDEP("post: drm");
 MODULE_AUTHOR("Matthew Garrett <mjg@...hat.com>");
 MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@...il.com>");
 MODULE_AUTHOR("Pali Rohár <pali@...nel.org>");
-- 
2.34.1