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Message-Id: <20251008064112.5981-1-W_Armin@gmx.de>
Date: Wed, 8 Oct 2025 08:41:12 +0200
From: Armin Wolf <W_Armin@....de>
To: matan@...alib.org,
peter@...bb.wattle.id.au
Cc: ilpo.jarvinen@...ux.intel.com,
hansg@...nel.org,
platform-driver-x86@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] platform/x86: lg-laptop: Add support for the HDAP opregion field
Various LG notebooks have a special field called "HDAP" inside
the ACPI operation region handled by the lg-laptop driver:
Field (XIN1, AnyAcc, Lock, Preserve)
{
DMSG, 8,
HDAP, 8,
Offset (0x10),
P80B, 8,
P81B, 8,
P82B, 8,
P83B, 8,
P84B, 8,
P85B, 8,
P86B, 8,
P87B, 8,
Offset (0x3E8),
PMSG, 1600
}
This field is set to 1/0 when the HD audio device is enabled/disabled
using the _PS0/_PS3 ACPI control methods. Add support for this field
to avoid printing warning messages when AML bytecode writes data
into it.
Reported-by: Peter Chubb <peter@...bb.wattle.id.au>
Tested-by: Peter Chubb <peter@...bb.wattle.id.au>
Signed-off-by: Armin Wolf <W_Armin@....de>
---
drivers/platform/x86/lg-laptop.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/platform/x86/lg-laptop.c b/drivers/platform/x86/lg-laptop.c
index 4b57102c7f62..9996bb43e9a0 100644
--- a/drivers/platform/x86/lg-laptop.c
+++ b/drivers/platform/x86/lg-laptop.c
@@ -18,6 +18,7 @@
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/platform_device.h>
+#include <linux/string_choices.h>
#include <linux/types.h>
#include <acpi/battery.h>
@@ -41,6 +42,7 @@ MODULE_PARM_DESC(fw_debug, "Enable printing of firmware debug messages");
#define LG_ADDRESS_SPACE_ID 0x8F
#define LG_ADDRESS_SPACE_DEBUG_FLAG_ADR 0x00
+#define LG_ADDRESS_SPACE_HD_AUDIO_POWER_ADDR 0x01
#define LG_ADDRESS_SPACE_FAN_MODE_ADR 0x03
#define LG_ADDRESS_SPACE_DTTM_FLAG_ADR 0x20
@@ -674,6 +676,15 @@ static acpi_status lg_laptop_address_space_write(struct device *dev, acpi_physic
byte = value & 0xFF;
switch (address) {
+ case LG_ADDRESS_SPACE_HD_AUDIO_POWER_ADDR:
+ /*
+ * The HD audio power field is not affected by the DTTM flag,
+ * so we have to manually check fw_debug.
+ */
+ if (fw_debug)
+ dev_dbg(dev, "HD audio power %s\n", str_enabled_disabled(byte));
+
+ return AE_OK;
case LG_ADDRESS_SPACE_FAN_MODE_ADR:
/*
* The fan mode field is not affected by the DTTM flag, so we
--
2.39.5
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