linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Michael Bottini <michael.a.bottini@linux.intel.com>
To: rjw@rjwysocki.net, lenb@kernel.org, irenic.rajneesh@gmail.com,
	david.e.box@linux.intel.com, hdegoede@redhat.com,
	mgross@linux.intel.com
Cc: Michael Bottini <michael.a.bottini@linux.intel.com>,
	linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
	platform-driver-x86@vger.kernel.org
Subject: [PATCH 2/2] platform/x86/intel/pmc: Add PSON residency counter
Date: Fri, 23 Jul 2021 13:21:57 -0700	[thread overview]
Message-ID: <20210723202157.2425-2-michael.a.bottini@linux.intel.com> (raw)
In-Reply-To: <20210723202157.2425-1-michael.a.bottini@linux.intel.com>

Tiger Lake devices have the capability to track the duration
of time that their Power Supply Units (PSUs) are turned off during S0ix.
This patch adds a debugfs file `pson_residency_usec` to provide
access to this counter.

In order to determine whether the device is capable of PSON,
use acpi_init_properties() to reevaluate _DSD.

Signed-off-by: Michael Bottini <michael.a.bottini@linux.intel.com>
---
 drivers/platform/x86/intel/pmc/core.c | 46 +++++++++++++++++++++++++++
 drivers/platform/x86/intel/pmc/core.h |  7 ++++
 2 files changed, 53 insertions(+)

diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index 7c4bf7d22fd5..6cf06aecf368 100644
--- a/drivers/platform/x86/intel/pmc/core.c
+++ b/drivers/platform/x86/intel/pmc/core.c
@@ -595,6 +595,8 @@ static const struct pmc_reg_map tgl_reg_map = {
 	.lpm_sts = tgl_lpm_maps,
 	.lpm_status_offset = TGL_LPM_STATUS_OFFSET,
 	.lpm_live_status_offset = TGL_LPM_LIVE_STATUS_OFFSET,
+	.pson_residency_offset = TGL_PSON_RESIDENCY_OFFSET,
+	.pson_residency_counter_step = TGL_PSON_RES_COUNTER_STEP,
 	.etr3_offset = ETR3_OFFSET,
 };
 
@@ -1084,6 +1086,20 @@ static int pmc_core_dev_state_get(void *data, u64 *val)
 
 DEFINE_DEBUGFS_ATTRIBUTE(pmc_core_dev_state, pmc_core_dev_state_get, NULL, "%llu\n");
 
+static int pmc_core_pson_residency_get(void *data, u64 *val)
+{
+	struct pmc_dev *pmcdev = data;
+	const struct pmc_reg_map *map = pmcdev->map;
+	u32 value;
+
+	value = pmc_core_reg_read(pmcdev, map->pson_residency_offset);
+	*val = (u64)value * pmcdev->map->pson_residency_counter_step;
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(pmc_core_pson_residency, pmc_core_pson_residency_get, NULL, "%llu\n");
+
 static int pmc_core_check_read_lock_bit(struct pmc_dev *pmcdev)
 {
 	u32 value;
@@ -1788,6 +1804,30 @@ static void pmc_core_get_low_power_modes(struct pmc_dev *pmcdev)
 	}
 }
 
+static bool pmc_core_is_pson_residency_enabled(struct pmc_dev *pmcdev)
+{
+	struct platform_device *pdev = pmcdev->pdev;
+	struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
+	acpi_status status;
+	u8 val;
+
+	if (!adev)
+		return false;
+
+	acpi_init_properties(adev);
+	status = acpi_evaluate_object(adev->handle, "PSOP", NULL, NULL);
+
+	if (ACPI_FAILURE(status))
+		return false;
+
+	if (fwnode_property_read_u8(acpi_fwnode_handle(adev),
+				    "intel-cec-pson-switching-enabled-in-s0",
+				    &val))
+		return false;
+
+	return val == 1;
+}
+
 static void pmc_core_dbgfs_unregister(struct pmc_dev *pmcdev)
 {
 	debugfs_remove_recursive(pmcdev->dbgfs_dir);
@@ -1856,6 +1896,11 @@ static void pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
 				    pmcdev->dbgfs_dir, pmcdev,
 				    &pmc_core_substate_req_regs_fops);
 	}
+
+	if (pmcdev->map->pson_residency_offset && pmc_core_is_pson_residency_enabled(pmcdev)) {
+		debugfs_create_file("pson_residency_usec", 0444,
+				    pmcdev->dbgfs_dir, pmcdev, &pmc_core_pson_residency);
+	}
 }
 
 static const struct x86_cpu_id intel_pmc_core_ids[] = {
@@ -1944,6 +1989,7 @@ static int pmc_core_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	platform_set_drvdata(pdev, pmcdev);
+	pmcdev->pdev = pdev;
 
 	cpu_id = x86_match_cpu(intel_pmc_core_ids);
 	if (!cpu_id)
diff --git a/drivers/platform/x86/intel/pmc/core.h b/drivers/platform/x86/intel/pmc/core.h
index 333e25981e8e..822d77f49861 100644
--- a/drivers/platform/x86/intel/pmc/core.h
+++ b/drivers/platform/x86/intel/pmc/core.h
@@ -214,6 +214,10 @@ enum ppfear_regs {
 #define TGL_LPM_PRI_OFFSET			0x1C7C
 #define TGL_LPM_NUM_MAPS			6
 
+/* Tigerlake PSON residency register */
+#define TGL_PSON_RESIDENCY_OFFSET		0x18f8
+#define TGL_PSON_RES_COUNTER_STEP		0x7A
+
 /* Extended Test Mode Register 3 (CNL and later) */
 #define ETR3_OFFSET				0x1048
 #define ETR3_CF9GR				BIT(20)
@@ -301,6 +305,8 @@ struct pmc_reg_map {
 	const u32 lpm_residency_offset;
 	const u32 lpm_status_offset;
 	const u32 lpm_live_status_offset;
+	const u32 pson_residency_offset;
+	const u32 pson_residency_counter_step;
 	const u32 etr3_offset;
 };
 
@@ -337,6 +343,7 @@ struct pmc_dev {
 	int num_lpm_modes;
 	int lpm_en_modes[LPM_MAX_NUM_MODES];
 	u32 *lpm_req_regs;
+	struct platform_device *pdev;
 };
 
 #define pmc_for_each_mode(i, mode, pmcdev)		\
-- 
2.25.1


  reply	other threads:[~2021-07-23 20:25 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-23 20:21 [PATCH 1/2] acpi: Add acpi_init_properties to ACPI driver code Michael Bottini
2021-07-23 20:21 ` Michael Bottini [this message]
     [not found]   ` <CAHp75Ve2Ls9KVM0KZ2GMgbrQvc6wXvAXP1CqSLzQ4JWMTAcZ0A@mail.gmail.com>
2021-07-24 19:49     ` [PATCH 2/2] platform/x86/intel/pmc: Add PSON residency counter David E. Box
2021-07-24 20:25       ` Andy Shevchenko
2021-07-24 10:51 ` [PATCH 1/2] acpi: Add acpi_init_properties to ACPI driver code Rafael J. Wysocki
2021-07-28  9:08 ` Hans de Goede
2021-07-28  9:10   ` Hans de Goede
2021-07-28 16:57     ` David E. Box

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210723202157.2425-2-michael.a.bottini@linux.intel.com \
    --to=michael.a.bottini@linux.intel.com \
    --cc=david.e.box@linux.intel.com \
    --cc=hdegoede@redhat.com \
    --cc=irenic.rajneesh@gmail.com \
    --cc=lenb@kernel.org \
    --cc=linux-acpi@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mgross@linux.intel.com \
    --cc=platform-driver-x86@vger.kernel.org \
    --cc=rjw@rjwysocki.net \
    --subject='Re: [PATCH 2/2] platform/x86/intel/pmc: Add PSON residency counter' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
on how to clone and mirror all data and code used for this inbox