linux-kernel - [PATCH v1 4/4] hwmon: (acpi_power_meter) Add the print of no notification that hardware limit is enforced

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Message-ID: <20241125093415.21719-5-lihuisong@huawei.com>
Date: Mon, 25 Nov 2024 17:34:15 +0800
From: Huisong Li <lihuisong@...wei.com>
To: <linux-hwmon@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <linux@...ck-us.net>, <jdelvare@...e.com>, <liuyonglong@...wei.com>,
	<zhanjie9@...ilicon.com>, <zhenglifeng1@...wei.com>, <lihuisong@...wei.com>
Subject: [PATCH v1 4/4] hwmon: (acpi_power_meter) Add the print of no notification that hardware limit is enforced

As ACPI spec said, the bit3 of the supported capabilities in _PMC indicates
that the power meter supports notifications when the hardware limit is
enforced. If one platform doesn't report this bit, but support hardware
forced limit through some out-of-band mechanism. Driver wouldn't receive
the related notifications to notify the OSPM to re-read the hardware limit.
So add the print of no notifcation that hardware limit is enforced.

Signed-off-by: Huisong Li <lihuisong@...wei.com>
---
 drivers/hwmon/acpi_power_meter.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c
index 3500859ff0bf..d3f144986fae 100644
--- a/drivers/hwmon/acpi_power_meter.c
+++ b/drivers/hwmon/acpi_power_meter.c
@@ -712,6 +712,10 @@ static int setup_attrs(struct acpi_power_meter_resource *resource)
 			goto skip_unsafe_cap;
 		}
 
+		if (resource->caps.flags & POWER_METER_CAN_NOTIFY == 0)
+			dev_info(&resource->acpi_dev->dev,
+				 "no notifcation when the hardware limit is enforced.\n");
+
 		if (resource->caps.configurable_cap)
 			res = register_attrs(resource, rw_cap_attrs);
 		else
-- 
2.22.0