linux-kernel - [PATCH 2/3] platform/x86/intel: vsec: Enable runtime D3

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Date:   Mon, 14 Feb 2022 13:32:57 -0800
From:   "David E. Box" <david.e.box@...ux.intel.com>
To:     hdegoede@...hat.com, david.e.box@...ux.intel.com,
        mgross@...ux.intel.com, rjw@...ysocki.net,
        srinivas.pandruvada@...el.com
Cc:     linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org
Subject: [PATCH 2/3] platform/x86/intel: vsec: Enable runtime D3

Add pm_runtime helpers to allow the PCI device to go to D3 when
not in use.

Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
---
 drivers/platform/x86/intel/pmt/class.c |  5 +++++
 drivers/platform/x86/intel/pmt/class.h |  3 +++
 drivers/platform/x86/intel/vsec.c      | 23 +++++++++++++++++++++++
 3 files changed, 31 insertions(+)

diff --git a/drivers/platform/x86/intel/pmt/class.c b/drivers/platform/x86/intel/pmt/class.c
index 85fc159961c1..a3ec09fe2f38 100644
--- a/drivers/platform/x86/intel/pmt/class.c
+++ b/drivers/platform/x86/intel/pmt/class.c
@@ -12,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/pci.h>
+#include <linux/pm_runtime.h>
 
 #include "../vsec.h"
 #include "class.h"
@@ -63,7 +64,10 @@ intel_pmt_read(struct file *filp, struct kobject *kobj,
 	if (count > entry->size - off)
 		count = entry->size - off;
 
+	pm_runtime_get_sync(&entry->pdev->dev);
 	memcpy_fromio(buf, entry->base + off, count);
+	pm_runtime_mark_last_busy(&entry->pdev->dev);
+	pm_runtime_put_autosuspend(&entry->pdev->dev);
 
 	return count;
 }
@@ -209,6 +213,7 @@ static int intel_pmt_dev_register(struct intel_pmt_entry *entry,
 	}
 
 	entry->kobj = &dev->kobj;
+	entry->pdev = to_pci_dev(parent->parent);
 
 	if (ns->attr_grp) {
 		ret = sysfs_create_group(entry->kobj, ns->attr_grp);
diff --git a/drivers/platform/x86/intel/pmt/class.h b/drivers/platform/x86/intel/pmt/class.h
index db11d58867ce..b4df7ee91c51 100644
--- a/drivers/platform/x86/intel/pmt/class.h
+++ b/drivers/platform/x86/intel/pmt/class.h
@@ -18,9 +18,12 @@
 #define GET_BIR(v)		((v) & GENMASK(2, 0))
 #define GET_ADDRESS(v)		((v) & GENMASK(31, 3))
 
+struct pci_dev;
+
 struct intel_pmt_entry {
 	struct bin_attribute	pmt_bin_attr;
 	struct kobject		*kobj;
+	struct pci_dev		*pdev;
 	void __iomem		*disc_table;
 	void __iomem		*base;
 	unsigned long		base_addr;
diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
index c3bdd75ed690..d182122c261d 100644
--- a/drivers/platform/x86/intel/vsec.c
+++ b/drivers/platform/x86/intel/vsec.c
@@ -19,6 +19,7 @@
 #include <linux/idr.h>
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/pm_runtime.h>
 #include <linux/types.h>
 
 #include "vsec.h"
@@ -355,9 +356,21 @@ static int intel_vsec_pci_probe(struct pci_dev *pdev, const struct pci_device_id
 	if (!have_devices)
 		return -ENODEV;
 
+	pm_runtime_put(&pdev->dev);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
+	pm_runtime_allow(&pdev->dev);
+
 	return 0;
 }
 
+static void intel_vsec_pci_remove(struct pci_dev *pdev)
+{
+	pm_runtime_forbid(&pdev->dev);
+	pm_runtime_dont_use_autosuspend(&pdev->dev);
+	pm_runtime_get(&pdev->dev);
+}
+
 /* TGL info */
 static const struct intel_vsec_platform_info tgl_info = {
 	.quirks = VSEC_QUIRK_NO_WATCHER | VSEC_QUIRK_NO_CRASHLOG | VSEC_QUIRK_TABLE_SHIFT,
@@ -383,6 +396,10 @@ static const struct intel_vsec_platform_info dg1_info = {
 	.quirks = VSEC_QUIRK_NO_DVSEC,
 };
 
+#ifdef CONFIG_PM_SLEEP
+static const struct dev_pm_ops intel_vsec_pm_ops = {};
+#endif
+
 #define PCI_DEVICE_ID_INTEL_VSEC_ADL		0x467d
 #define PCI_DEVICE_ID_INTEL_VSEC_DG1		0x490e
 #define PCI_DEVICE_ID_INTEL_VSEC_OOBMSM		0x09a7
@@ -400,6 +417,12 @@ static struct pci_driver intel_vsec_pci_driver = {
 	.name = "intel_vsec",
 	.id_table = intel_vsec_pci_ids,
 	.probe = intel_vsec_pci_probe,
+	.remove = intel_vsec_pci_remove,
+	.driver = {
+#ifdef CONFIG_PM_SLEEP
+		.pm = &intel_vsec_pm_ops,
+#endif
+	},
 };
 module_pci_driver(intel_vsec_pci_driver);
 
-- 
2.25.1