linux-kernel - [RFC 3/3] platform/x86/intel/pmc: core: Report duration of time in deepest HW state

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Message-ID: <20221031204320.22464-4-mario.limonciello@amd.com>
Date:   Mon, 31 Oct 2022 15:43:19 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Sven van Ashbrook <svenva@...omium.org>,
        Rafael J Wysocki <rafael@...nel.org>,
        Rajneesh Bhardwaj <irenic.rajneesh@...il.com>,
        "David E Box" <david.e.box@...el.com>
CC:     S-k Shyam-sundar <Shyam-sundar.S-k@....com>,
        <rrangel@...omium.org>, <platform-driver-x86@...r.kernel.org>,
        Rajat Jain <rajatja@...gle.com>,
        "Hans de Goede" <hdegoede@...hat.com>,
        Mario Limonciello <mario.limonciello@....com>,
        Mark Gross <markgross@...nel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [RFC 3/3] platform/x86/intel/pmc: core: Report duration of time in deepest HW state

intel_pmc_core displays a warning when a suspend didn't get to the deepest
state.

This information is generally useful to userspace as well which may use
it to collect further debugging data. Report this to the standard kernel
reporting infrastructure that can be accessed from sysfs.

Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/platform/x86/intel/pmc/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index 17ec5825d13d7..9e58228b01f91 100644
--- a/drivers/platform/x86/intel/pmc/core.c
+++ b/drivers/platform/x86/intel/pmc/core.c
@@ -2116,6 +2116,8 @@ static __maybe_unused int pmc_core_resume(struct device *dev)
 	if (!pmcdev->check_counters)
 		return 0;
 
+	pm_set_hw_deepest_state(pmcdev->s0ix_counter);
+
 	if (!pmc_core_is_s0ix_failed(pmcdev))
 		return 0;
 
-- 
2.34.1