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platform/loongarch: laptop: Explicitly reset bl_powered state when suspend

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On EAECIS NL60R with EC firmware version 1.11, resuming from S3 has a
very high chance (>90%) of causing the EC to lose the previous backlight
power state. When this happens, the laptop resumes normally from S3, but
the backlight remains off (when shining on the screen with a flash light,
we can see the screen contents are updating normally).

Since there is no generic way to query the EC's backlight state on
Loongson laptop platforms, assume the worst-case scenario and restart
the backlight power inside the kernel each time the system resumes.

Cc: stable@vger.kernel.org
Fixes: 53c762b47f ("platform/loongarch: laptop: Add backlight power control support")
Tested-by: Yao Zi <me@ziyao.cc>
Tested-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Zixing Liu <liushuyu@aosc.io>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Zixing Liu 2026-07-24 16:33:14 +08:00 committed by Huacai Chen
parent cf4dd800e4
commit 91a70492c0
1 changed files with 1 additions and 0 deletions
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drivers/platform/loongarch/loongson-laptop.c
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@ -186,6 +186,7 @@ static int __init setup_acpi_notify(struct generic_sub_driver *sub_driver)
static int loongson_hotkey_suspend(struct device *dev)
{
bl_powered = false;
return 0;
}