linux-kernel - [PATCH] ACPI / processor: Set P_LVL{2,3} idle state descriptions

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Message-ID: <20190218013335.233265-1-Yazen.Ghannam@amd.com>
Date:   Mon, 18 Feb 2019 01:33:49 +0000
From:   "Ghannam, Yazen" <Yazen.Ghannam@....com>
To:     "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
CC:     "Ghannam, Yazen" <Yazen.Ghannam@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "lenb@...nel.org" <lenb@...nel.org>
Subject: [PATCH] ACPI / processor: Set P_LVL{2,3} idle state descriptions

From: Yazen Ghannam <yazen.ghannam@....com>

The ACPI idle driver will fallback to using the legacy P_LVL* SystemIO
method of entering C-states if the _CST method is disabled and P_BLK is
defined. However, in this case the C2 and C3 states won't have a
description set, so the user will see "<null>" when reading the
description from sysfs.

Give each of these states a description.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
 drivers/acpi/processor_idle.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index b2131c4ea124..98d4ec5bf450 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -282,6 +282,13 @@ static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
 			  pr->power.states[ACPI_STATE_C2].address,
 			  pr->power.states[ACPI_STATE_C3].address));
 
+	snprintf(pr->power.states[ACPI_STATE_C2].desc,
+			 ACPI_CX_DESC_LEN, "ACPI P_LVL2 IOPORT 0x%x",
+			 pr->power.states[ACPI_STATE_C2].address);
+	snprintf(pr->power.states[ACPI_STATE_C3].desc,
+			 ACPI_CX_DESC_LEN, "ACPI P_LVL3 IOPORT 0x%x",
+			 pr->power.states[ACPI_STATE_C3].address);
+
 	return 0;
 }
 
-- 
2.17.1