Merge tag 'pm+acpi-4.4-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull more power management and ACPI updates from Rafael Wysocki:
 "The only new feature in this batch is support for the ACPI _CCA device
  configuration object, which it a pre-requisite for future ACPI PCI
  support on ARM64, but should not affect the other architectures.

  The rest is fixes and cleanups, mostly in cpufreq (including
  intel_pstate), the Operating Performace Points (OPP) framework and
  tools (cpupower and turbostat).

  Specifics:

   - Support for the ACPI _CCA configuration object intended to tell the
     OS whether or not a bus master device supports hardware managed
     cache coherency and a new set of functions to allow drivers to
     check the cache coherency support for devices in a platform
     firmware interface agnostic way (Suravee Suthikulpanit, Jeremy
     Linton).

   - ACPI backlight quirks for ESPRIMO Mobile M9410 and Dell XPS L421X
     (Aaron Lu, Hans de Goede).

   - Fixes for the arm_big_little and s5pv210-cpufreq cpufreq drivers
     (Jon Medhurst, Nicolas Pitre).

   - kfree()-related fixup for the recently introduced CPPC cpufreq
     frontend (Markus Elfring).

   - intel_pstate fix reducing kernel log noise on systems where
     P-states are managed by hardware (Prarit Bhargava).

   - intel_pstate maintainers information update (Srinivas Pandruvada).

   - cpufreq core optimization related to the handling of delayed work
     items used by governors (Viresh Kumar).

   - Locking fixes and cleanups of the Operating Performance Points
     (OPP) framework (Viresh Kumar).

   - Generic power domains framework cleanups (Lina Iyer).

   - cpupower tool updates (Jacob Tanenbaum, Sriram Raghunathan, Thomas
     Renninger).

   - turbostat tool updates (Len Brown)"

* tag 'pm+acpi-4.4-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (32 commits)
  PCI: ACPI: Add support for PCI device DMA coherency
  PCI: OF: Move of_pci_dma_configure() to pci_dma_configure()
  of/pci: Fix pci_get_host_bridge_device leak
  device property: ACPI: Remove unused DMA APIs
  device property: ACPI: Make use of the new DMA Attribute APIs
  device property: Adding DMA Attribute APIs for Generic Devices
  ACPI: Adding DMA Attribute APIs for ACPI Device
  device property: Introducing enum dev_dma_attr
  ACPI: Honor ACPI _CCA attribute setting
  cpufreq: CPPC: Delete an unnecessary check before the function call kfree()
  PM / OPP: Add opp_rcu_lockdep_assert() to _find_device_opp()
  PM / OPP: Hold dev_opp_list_lock for writers
  PM / OPP: Protect updates to list_dev with mutex
  PM / OPP: Propagate error properly from dev_pm_opp_set_sharing_cpus()
  cpufreq: s5pv210-cpufreq: fix wrong do_div() usage
  MAINTAINERS: update for intel P-state driver
  Creating a common structure initialization pattern for struct option
  cpupower: Enable disabled Cstates if they are below max latency
  cpupower: Remove debug message when using cpupower idle-set -D switch
  cpupower: cpupower monitor reports uninitialized values for offline cpus
  ...

19 files changed, 297 insertions, 107 deletions

diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
index 06a67d5f2846..296b7a14893a 100644
--- a/drivers/acpi/acpi_platform.c
+++ b/drivers/acpi/acpi_platform.c
@@ -103,7 +103,12 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
 	pdevinfo.res = resources;
 	pdevinfo.num_res = count;
 	pdevinfo.fwnode = acpi_fwnode_handle(adev);
-	pdevinfo.dma_mask = acpi_check_dma(adev, NULL) ? DMA_BIT_MASK(32) : 0;
+
+	if (acpi_dma_supported(adev))
+		pdevinfo.dma_mask = DMA_BIT_MASK(32);
+	else
+		pdevinfo.dma_mask = 0;
+
 	pdev = platform_device_register_full(&pdevinfo);
 	if (IS_ERR(pdev))
 		dev_err(&adev->dev, "platform device creation failed: %ld\n",
diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c
index 5778e8e4313a..3405f7a41e25 100644
--- a/drivers/acpi/acpi_video.c
+++ b/drivers/acpi/acpi_video.c
@@ -77,6 +77,12 @@ module_param(allow_duplicates, bool, 0644);
 static int disable_backlight_sysfs_if = -1;
 module_param(disable_backlight_sysfs_if, int, 0444);
 
+static bool device_id_scheme = false;
+module_param(device_id_scheme, bool, 0444);
+
+static bool only_lcd = false;
+module_param(only_lcd, bool, 0444);
+
 static int register_count;
 static DEFINE_MUTEX(register_count_mutex);
 static struct mutex video_list_lock;
@@ -394,6 +400,18 @@ static int video_disable_backlight_sysfs_if(
 	return 0;
 }
 
+static int video_set_device_id_scheme(const struct dmi_system_id *d)
+{
+	device_id_scheme = true;
+	return 0;
+}
+
+static int video_enable_only_lcd(const struct dmi_system_id *d)
+{
+	only_lcd = true;
+	return 0;
+}
+
 static struct dmi_system_id video_dmi_table[] = {
 	/*
 	 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
@@ -455,6 +473,33 @@ static struct dmi_system_id video_dmi_table[] = {
 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
 		},
 	},
+	/*
+	 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
+	 * but the IDs actually follow the Device ID Scheme.
+	 */
+	{
+	 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
+	 .callback = video_set_device_id_scheme,
+	 .ident = "ESPRIMO Mobile M9410",
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
+		},
+	},
+	/*
+	 * Some machines have multiple video output devices, but only the one
+	 * that is the type of LCD can do the backlight control so we should not
+	 * register backlight interface for other video output devices.
+	 */
+	{
+	 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
+	 .callback = video_enable_only_lcd,
+	 .ident = "ESPRIMO Mobile M9410",
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
+		},
+	},
 	{}
 };
 
@@ -1003,7 +1048,7 @@ acpi_video_bus_get_one_device(struct acpi_device *device,
 
 	attribute = acpi_video_get_device_attr(video, device_id);
 
-	if (attribute && attribute->device_id_scheme) {
+	if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
 		switch (attribute->display_type) {
 		case ACPI_VIDEO_DISPLAY_CRT:
 			data->flags.crt = 1;
@@ -1568,15 +1613,6 @@ static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
 	static int count;
 	char *name;
 
-	/*
-	 * Do not create backlight device for video output
-	 * device that is not in the enumerated list.
-	 */
-	if (!acpi_video_device_in_dod(device)) {
-		dev_dbg(&device->dev->dev, "not in _DOD list, ignore\n");
-		return;
-	}
-
 	result = acpi_video_init_brightness(device);
 	if (result)
 		return;
@@ -1657,6 +1693,22 @@ static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
 	mutex_unlock(&video->device_list_lock);
 }
 
+static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
+{
+	/*
+	 * Do not create backlight device for video output
+	 * device that is not in the enumerated list.
+	 */
+	if (!acpi_video_device_in_dod(dev)) {
+		dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
+		return false;
+	}
+
+	if (only_lcd)
+		return dev->flags.lcd;
+	return true;
+}
+
 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
 {
 	struct acpi_video_device *dev;
@@ -1670,8 +1722,10 @@ static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
 		return 0;
 
 	mutex_lock(&video->device_list_lock);
-	list_for_each_entry(dev, &video->video_device_list, entry)
-		acpi_video_dev_register_backlight(dev);
+	list_for_each_entry(dev, &video->video_device_list, entry) {
+		if (acpi_video_should_register_backlight(dev))
+			acpi_video_dev_register_backlight(dev);
+	}
 	mutex_unlock(&video->device_list_lock);
 
 	video->backlight_registered = true;
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 1470ae4f98c0..5ea5dc219f56 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -168,7 +168,7 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
 	struct list_head *physnode_list;
 	unsigned int node_id;
 	int retval = -EINVAL;
-	bool coherent;
+	enum dev_dma_attr attr;
 
 	if (has_acpi_companion(dev)) {
 		if (acpi_dev) {
@@ -225,8 +225,10 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
 	if (!has_acpi_companion(dev))
 		ACPI_COMPANION_SET(dev, acpi_dev);
 
-	if (acpi_check_dma(acpi_dev, &coherent))
-		arch_setup_dma_ops(dev, 0, 0, NULL, coherent);
+	attr = acpi_get_dma_attr(acpi_dev);
+	if (attr != DEV_DMA_NOT_SUPPORTED)
+		arch_setup_dma_ops(dev, 0, 0, NULL,
+				   attr == DEV_DMA_COHERENT);
 
 	acpi_physnode_link_name(physical_node_name, node_id);
 	retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index daf9fc8329e6..78d5f02a073b 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1308,6 +1308,48 @@ void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
 	kfree(pnp->unique_id);
 }
 
+/**
+ * acpi_dma_supported - Check DMA support for the specified device.
+ * @adev: The pointer to acpi device
+ *
+ * Return false if DMA is not supported. Otherwise, return true
+ */
+bool acpi_dma_supported(struct acpi_device *adev)
+{
+	if (!adev)
+		return false;
+
+	if (adev->flags.cca_seen)
+		return true;
+
+	/*
+	* Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
+	* DMA on "Intel platforms".  Presumably that includes all x86 and
+	* ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
+	*/
+	if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
+		return true;
+
+	return false;
+}
+
+/**
+ * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
+ * @adev: The pointer to acpi device
+ *
+ * Return enum dev_dma_attr.
+ */
+enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
+{
+	if (!acpi_dma_supported(adev))
+		return DEV_DMA_NOT_SUPPORTED;
+
+	if (adev->flags.coherent_dma)
+		return DEV_DMA_COHERENT;
+	else
+		return DEV_DMA_NON_COHERENT;
+}
+
 static void acpi_init_coherency(struct acpi_device *adev)
 {
 	unsigned long long cca = 0;
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 0d3a384b508a..daaf1c4e1e0f 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -233,6 +233,15 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
 		},
 	},
 	{
+	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
+	 .callback = video_detect_force_video,
+	 .ident = "Dell XPS14 L421X",
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
+		},
+	},
+	{
 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
 	 .callback = video_detect_force_video,
 	 .ident = "Dell XPS15 L521X",
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 80e298870388..e03b1ad25a90 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -321,8 +321,7 @@ static int genpd_poweroff(struct generic_pm_domain *genpd, bool is_async)
 		if (stat > PM_QOS_FLAGS_NONE)
 			return -EBUSY;
 
-		if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev)
-		    || pdd->dev->power.irq_safe))
+		if (!pm_runtime_suspended(pdd->dev) || pdd->dev->power.irq_safe)
 			not_suspended++;
 	}
 
@@ -1312,13 +1311,17 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
 int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
 			   struct generic_pm_domain *subdomain)
 {
-	struct gpd_link *link;
+	struct gpd_link *link, *itr;
 	int ret = 0;
 
 	if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)
 	    || genpd == subdomain)
 		return -EINVAL;
 
+	link = kzalloc(sizeof(*link), GFP_KERNEL);
+	if (!link)
+		return -ENOMEM;
+
 	mutex_lock(&genpd->lock);
 	mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
 
@@ -1328,18 +1331,13 @@ int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
 		goto out;
 	}
 
-	list_for_each_entry(link, &genpd->master_links, master_node) {
-		if (link->slave == subdomain && link->master == genpd) {
+	list_for_each_entry(itr, &genpd->master_links, master_node) {
+		if (itr->slave == subdomain && itr->master == genpd) {
 			ret = -EINVAL;
 			goto out;
 		}
 	}
 
-	link = kzalloc(sizeof(*link), GFP_KERNEL);
-	if (!link) {
-		ret = -ENOMEM;
-		goto out;
-	}
 	link->master = genpd;
 	list_add_tail(&link->master_node, &genpd->master_links);
 	link->slave = subdomain;
@@ -1350,7 +1348,8 @@ int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
  out:
 	mutex_unlock(&subdomain->lock);
 	mutex_unlock(&genpd->lock);
-
+	if (ret)
+		kfree(link);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain);
diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c
index 270902007055..b8e76f75073b 100644
--- a/drivers/base/power/opp/core.c
+++ b/drivers/base/power/opp/core.c
@@ -11,6 +11,8 @@
  * published by the Free Software Foundation.
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/slab.h>
@@ -27,7 +29,7 @@
  */
 static LIST_HEAD(dev_opp_list);
 /* Lock to allow exclusive modification to the device and opp lists */
-static DEFINE_MUTEX(dev_opp_list_lock);
+DEFINE_MUTEX(dev_opp_list_lock);
 
 #define opp_rcu_lockdep_assert()					\
 do {									\
@@ -79,14 +81,18 @@ static struct device_opp *_managed_opp(const struct device_node *np)
  * Return: pointer to 'struct device_opp' if found, otherwise -ENODEV or
  * -EINVAL based on type of error.
  *
- * Locking: This function must be called under rcu_read_lock(). device_opp
- * is a RCU protected pointer. This means that device_opp is valid as long
- * as we are under RCU lock.
+ * Locking: For readers, this function must be called under rcu_read_lock().
+ * device_opp is a RCU protected pointer, which means that device_opp is valid
+ * as long as we are under RCU lock.
+ *
+ * For Writers, this function must be called with dev_opp_list_lock held.
  */
 struct device_opp *_find_device_opp(struct device *dev)
 {
 	struct device_opp *dev_opp;
 
+	opp_rcu_lockdep_assert();
+
 	if (IS_ERR_OR_NULL(dev)) {
 		pr_err("%s: Invalid parameters\n", __func__);
 		return ERR_PTR(-EINVAL);
@@ -701,7 +707,7 @@ static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
 }
 
 /**
- * _opp_add_dynamic() - Allocate a dynamic OPP.
+ * _opp_add_v1() - Allocate a OPP based on v1 bindings.
  * @dev:	device for which we do this operation
  * @freq:	Frequency in Hz for this OPP
  * @u_volt:	Voltage in uVolts for this OPP
@@ -727,8 +733,8 @@ static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
  *		Duplicate OPPs (both freq and volt are same) and !opp->available
  * -ENOMEM	Memory allocation failure
  */
-static int _opp_add_dynamic(struct device *dev, unsigned long freq,
-			    long u_volt, bool dynamic)
+static int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
+		       bool dynamic)
 {
 	struct device_opp *dev_opp;
 	struct dev_pm_opp *new_opp;
@@ -770,9 +776,10 @@ unlock:
 }
 
 /* TODO: Support multiple regulators */
-static int opp_get_microvolt(struct dev_pm_opp *opp, struct device *dev)
+static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev)
 {
 	u32 microvolt[3] = {0};
+	u32 val;
 	int count, ret;
 
 	/* Missing property isn't a problem, but an invalid entry is */
@@ -805,6 +812,9 @@ static int opp_get_microvolt(struct dev_pm_opp *opp, struct device *dev)
 	opp->u_volt_min = microvolt[1];
 	opp->u_volt_max = microvolt[2];
 
+	if (!of_property_read_u32(opp->np, "opp-microamp", &val))
+		opp->u_amp = val;
+
 	return 0;
 }
 
@@ -869,13 +879,10 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
 	if (!of_property_read_u32(np, "clock-latency-ns", &val))
 		new_opp->clock_latency_ns = val;
 
-	ret = opp_get_microvolt(new_opp, dev);
+	ret = opp_parse_supplies(new_opp, dev);
 	if (ret)
 		goto free_opp;
 
-	if (!of_property_read_u32(new_opp->np, "opp-microamp", &val))
-		new_opp->u_amp = val;
-
 	ret = _opp_add(dev, new_opp, dev_opp);
 	if (ret)
 		goto free_opp;
@@ -939,7 +946,7 @@ unlock:
  */
 int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
 {
-	return _opp_add_dynamic(dev, freq, u_volt, true);
+	return _opp_add_v1(dev, freq, u_volt, true);
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_add);
 
@@ -1172,13 +1179,17 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
 	struct device_opp *dev_opp;
 	int ret = 0, count = 0;
 
+	mutex_lock(&dev_opp_list_lock);
+
 	dev_opp = _managed_opp(opp_np);
 	if (dev_opp) {
 		/* OPPs are already managed */
 		if (!_add_list_dev(dev, dev_opp))
 			ret = -ENOMEM;
+		mutex_unlock(&dev_opp_list_lock);
 		return ret;
 	}
+	mutex_unlock(&dev_opp_list_lock);
 
 	/* We have opp-list node now, iterate over it and add OPPs */
 	for_each_available_child_of_node(opp_np, np) {
@@ -1196,15 +1207,20 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
 	if (WARN_ON(!count))
 		return -ENOENT;
 
+	mutex_lock(&dev_opp_list_lock);
+
 	dev_opp = _find_device_opp(dev);
 	if (WARN_ON(IS_ERR(dev_opp))) {
 		ret = PTR_ERR(dev_opp);
+		mutex_unlock(&dev_opp_list_lock);
 		goto free_table;
 	}
 
 	dev_opp->np = opp_np;
 	dev_opp->shared_opp = of_property_read_bool(opp_np, "opp-shared");
 
+	mutex_unlock(&dev_opp_list_lock);
+
 	return 0;
 
 free_table:
@@ -1241,7 +1257,7 @@ static int _of_add_opp_table_v1(struct device *dev)
 		unsigned long freq = be32_to_cpup(val++) * 1000;
 		unsigned long volt = be32_to_cpup(val++);
 
-		if (_opp_add_dynamic(dev, freq, volt, false))
+		if (_opp_add_v1(dev, freq, volt, false))
 			dev_warn(dev, "%s: Failed to add OPP %ld\n",
 				 __func__, freq);
 		nr -= 2;
diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c
index 7654c5606307..7b445e88a0d5 100644
--- a/drivers/base/power/opp/cpu.c
+++ b/drivers/base/power/opp/cpu.c
@@ -10,6 +10,9 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/cpu.h>
 #include <linux/cpufreq.h>
 #include <linux/err.h>
@@ -124,12 +127,12 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
 	struct device *dev;
 	int cpu, ret = 0;
 
-	rcu_read_lock();
+	mutex_lock(&dev_opp_list_lock);
 
 	dev_opp = _find_device_opp(cpu_dev);
 	if (IS_ERR(dev_opp)) {
 		ret = -EINVAL;
-		goto out_rcu_read_unlock;
+		goto unlock;
 	}
 
 	for_each_cpu(cpu, cpumask) {
@@ -150,10 +153,10 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
 			continue;
 		}
 	}
-out_rcu_read_unlock:
-	rcu_read_unlock();
+unlock:
+	mutex_unlock(&dev_opp_list_lock);
 
-	return 0;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus);
 
diff --git a/drivers/base/power/opp/opp.h b/drivers/base/power/opp/opp.h
index dcb38f78dae4..7366b2aa8997 100644
--- a/drivers/base/power/opp/opp.h
+++ b/drivers/base/power/opp/opp.h
@@ -21,6 +21,9 @@
 #include <linux/rculist.h>
 #include <linux/rcupdate.h>
 
+/* Lock to allow exclusive modification to the device and opp lists */
+extern struct mutex dev_opp_list_lock;
+
 /*
  * Internal data structure organization with the OPP layer library is as
  * follows:
diff --git a/drivers/base/property.c b/drivers/base/property.c
index de40623bbd8a..1325ff225cc4 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -598,18 +598,34 @@ unsigned int device_get_child_node_count(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(device_get_child_node_count);
 
-bool device_dma_is_coherent(struct device *dev)
+bool device_dma_supported(struct device *dev)
 {
-	bool coherent = false;
-
+	/* For DT, this is always supported.
+	 * For ACPI, this depends on CCA, which
+	 * is determined by the acpi_dma_supported().
+	 */
 	if (IS_ENABLED(CONFIG_OF) && dev->of_node)
-		coherent = of_dma_is_coherent(dev->of_node);
-	else
-		acpi_check_dma(ACPI_COMPANION(dev), &coherent);
+		return true;
+
+	return acpi_dma_supported(ACPI_COMPANION(dev));
+}
+EXPORT_SYMBOL_GPL(device_dma_supported);
 
-	return coherent;
+enum dev_dma_attr device_get_dma_attr(struct device *dev)
+{
+	enum dev_dma_attr attr = DEV_DMA_NOT_SUPPORTED;
+
+	if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
+		if (of_dma_is_coherent(dev->of_node))
+			attr = DEV_DMA_COHERENT;
+		else
+			attr = DEV_DMA_NON_COHERENT;
+	} else
+		attr = acpi_get_dma_attr(ACPI_COMPANION(dev));
+
+	return attr;
 }
-EXPORT_SYMBOL_GPL(device_dma_is_coherent);
+EXPORT_SYMBOL_GPL(device_get_dma_attr);
 
 /**
  * device_get_phy_mode - Get phy mode for given device
diff --git a/drivers/cpufreq/arm_big_little.c b/drivers/cpufreq/arm_big_little.c
index f1e42f8ce0fc..c5d256caa664 100644
--- a/drivers/cpufreq/arm_big_little.c
+++ b/drivers/cpufreq/arm_big_little.c
@@ -149,6 +149,19 @@ bL_cpufreq_set_rate(u32 cpu, u32 old_cluster, u32 new_cluster, u32 rate)
 			__func__, cpu, old_cluster, new_cluster, new_rate);
 
 	ret = clk_set_rate(clk[new_cluster], new_rate * 1000);
+	if (!ret) {
+		/*
+		 * FIXME: clk_set_rate hasn't returned an error here however it
+		 * may be that clk_change_rate failed due to hardware or
+		 * firmware issues and wasn't able to report that due to the
+		 * current design of the clk core layer. To work around this
+		 * problem we will read back the clock rate and check it is
+		 * correct. This needs to be removed once clk core is fixed.
+		 */
+		if (clk_get_rate(clk[new_cluster]) != new_rate * 1000)
+			ret = -EIO;
+	}
+
 	if (WARN_ON(ret)) {
 		pr_err("clk_set_rate failed: %d, new cluster: %d\n", ret,
 				new_cluster);
@@ -189,15 +202,6 @@ bL_cpufreq_set_rate(u32 cpu, u32 old_cluster, u32 new_cluster, u32 rate)
 		mutex_unlock(&cluster_lock[old_cluster]);
 	}
 
-	/*
-	 * FIXME: clk_set_rate has to handle the case where clk_change_rate
-	 * can fail due to hardware or firmware issues. Until the clk core
-	 * layer is fixed, we can check here. In most of the cases we will
-	 * be reading only the cached value anyway. This needs to  be removed
-	 * once clk core is fixed.
-	 */
-	if (bL_cpufreq_get_rate(cpu) != new_rate)
-		return -EIO;
 	return 0;
 }
 
diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
index 93c219fab850..e8cb334094b0 100644
--- a/drivers/cpufreq/cppc_cpufreq.c
+++ b/drivers/cpufreq/cppc_cpufreq.c
@@ -166,8 +166,7 @@ static int __init cppc_cpufreq_init(void)
 
 out:
 	for_each_possible_cpu(i)
-		if (all_cpu_data[i])
-			kfree(all_cpu_data[i]);
+		kfree(all_cpu_data[i]);
 
 	kfree(all_cpu_data);
 	return -ENODEV;
diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
index 11258c4c1b17..b260576ddb12 100644
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -171,10 +171,6 @@ void gov_queue_work(struct dbs_data *dbs_data, struct cpufreq_policy *policy,
 {
 	int i;
 
-	mutex_lock(&cpufreq_governor_lock);
-	if (!policy->governor_enabled)
-		goto out_unlock;
-
 	if (!all_cpus) {
 		/*
 		 * Use raw_smp_processor_id() to avoid preemptible warnings.
@@ -188,9 +184,6 @@ void gov_queue_work(struct dbs_data *dbs_data, struct cpufreq_policy *policy,
 		for_each_cpu(i, policy->cpus)
 			__gov_queue_work(i, dbs_data, delay);
 	}
-
-out_unlock:
-	mutex_unlock(&cpufreq_governor_lock);
 }
 EXPORT_SYMBOL_GPL(gov_queue_work);
 
@@ -229,13 +222,24 @@ static void dbs_timer(struct work_struct *work)
 	struct cpu_dbs_info *cdbs = container_of(work, struct cpu_dbs_info,
 						 dwork.work);
 	struct cpu_common_dbs_info *shared = cdbs->shared;
-	struct cpufreq_policy *policy = shared->policy;
-	struct dbs_data *dbs_data = policy->governor_data;
+	struct cpufreq_policy *policy;
+	struct dbs_data *dbs_data;
 	unsigned int sampling_rate, delay;
 	bool modify_all = true;
 
 	mutex_lock(&shared->timer_mutex);
 
+	policy = shared->policy;
+
+	/*
+	 * Governor might already be disabled and there is no point continuing
+	 * with the work-handler.
+	 */
+	if (!policy)
+		goto unlock;
+
+	dbs_data = policy->governor_data;
+
 	if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
 		struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
 
@@ -252,6 +256,7 @@ static void dbs_timer(struct work_struct *work)
 	delay = dbs_data->cdata->gov_dbs_timer(cdbs, dbs_data, modify_all);
 	gov_queue_work(dbs_data, policy, delay, modify_all);
 
+unlock:
 	mutex_unlock(&shared->timer_mutex);
 }
 
@@ -478,9 +483,17 @@ static int cpufreq_governor_stop(struct cpufreq_policy *policy,
 	if (!shared || !shared->policy)
 		return -EBUSY;
 
+	/*
+	 * Work-handler must see this updated, as it should not proceed any
+	 * further after governor is disabled. And so timer_mutex is taken while
+	 * updating this value.
+	 */
+	mutex_lock(&shared->timer_mutex);
+	shared->policy = NULL;
+	mutex_unlock(&shared->timer_mutex);
+
 	gov_cancel_work(dbs_data, policy);
 
-	shared->policy = NULL;
 	mutex_destroy(&shared->timer_mutex);
 	return 0;
 }
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 93a3c635ea27..2e31d097def6 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -684,8 +684,6 @@ static void __init intel_pstate_sysfs_expose_params(void)
 
 static void intel_pstate_hwp_enable(struct cpudata *cpudata)
 {
-	pr_info("intel_pstate: HWP enabled\n");
-
 	wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1);
 }
 
@@ -1557,8 +1555,10 @@ static int __init intel_pstate_init(void)
 	if (!all_cpu_data)
 		return -ENOMEM;
 
-	if (static_cpu_has_safe(X86_FEATURE_HWP) && !no_hwp)
+	if (static_cpu_has_safe(X86_FEATURE_HWP) && !no_hwp) {
+		pr_info("intel_pstate: HWP enabled\n");
 		hwp_active++;
+	}
 
 	if (!hwp_active && hwp_only)
 		goto out;
@@ -1593,8 +1593,10 @@ static int __init intel_pstate_setup(char *str)
 
 	if (!strcmp(str, "disable"))
 		no_load = 1;
-	if (!strcmp(str, "no_hwp"))
+	if (!strcmp(str, "no_hwp")) {
+		pr_info("intel_pstate: HWP disabled\n");
 		no_hwp = 1;
+	}
 	if (!strcmp(str, "force"))
 		force_load = 1;
 	if (!strcmp(str, "hwp_only"))
diff --git a/drivers/cpufreq/s5pv210-cpufreq.c b/drivers/cpufreq/s5pv210-cpufreq.c
index 9e231f52150c..051a8a8224cd 100644
--- a/drivers/cpufreq/s5pv210-cpufreq.c
+++ b/drivers/cpufreq/s5pv210-cpufreq.c
@@ -212,11 +212,11 @@ static void s5pv210_set_refresh(enum s5pv210_dmc_port ch, unsigned long freq)
 	/* Find current DRAM frequency */
 	tmp = s5pv210_dram_conf[ch].freq;
 
-	do_div(tmp, freq);
+	tmp /= freq;
 
 	tmp1 = s5pv210_dram_conf[ch].refresh;
 
-	do_div(tmp1, tmp);
+	tmp1 /= tmp;
 
 	__raw_writel(tmp1, reg);
 }
diff --git a/drivers/crypto/ccp/ccp-platform.c b/drivers/crypto/ccp/ccp-platform.c
index 8b923b7e9389..01b50cb4c982 100644
--- a/drivers/crypto/ccp/ccp-platform.c
+++ b/drivers/crypto/ccp/ccp-platform.c
@@ -94,6 +94,7 @@ static int ccp_platform_probe(struct platform_device *pdev)
 	struct ccp_device *ccp;
 	struct ccp_platform *ccp_platform;
 	struct device *dev = &pdev->dev;
+	enum dev_dma_attr attr;
 	struct resource *ior;
 	int ret;
 
@@ -118,18 +119,24 @@ static int ccp_platform_probe(struct platform_device *pdev)
 	}
 	ccp->io_regs = ccp->io_map;
 
-	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
-	if (ret) {
-		dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
+	attr = device_get_dma_attr(dev);
+	if (attr == DEV_DMA_NOT_SUPPORTED) {
+		dev_err(dev, "DMA is not supported");
 		goto e_err;
 	}
 
-	ccp_platform->coherent = device_dma_is_coherent(ccp->dev);
+	ccp_platform->coherent = (attr == DEV_DMA_COHERENT);
 	if (ccp_platform->coherent)
 		ccp->axcache = CACHE_WB_NO_ALLOC;
 	else
 		ccp->axcache = CACHE_NONE;
 
+	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
+	if (ret) {
+		dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
+		goto e_err;
+	}
+
 	dev_set_drvdata(dev, ccp);
 
 	ret = ccp_init(ccp);
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-main.c b/drivers/net/ethernet/amd/xgbe/xgbe-main.c
index 7dd893331785..618d952c2984 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-main.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-main.c
@@ -342,6 +342,7 @@ static int xgbe_probe(struct platform_device *pdev)
 	struct resource *res;
 	const char *phy_mode;
 	unsigned int i, phy_memnum, phy_irqnum;
+	enum dev_dma_attr attr;
 	int ret;
 
 	DBGPR("--> xgbe_probe\n");
@@ -609,7 +610,12 @@ static int xgbe_probe(struct platform_device *pdev)
 		goto err_io;
 
 	/* Set the DMA coherency values */
-	pdata->coherent = device_dma_is_coherent(pdata->dev);
+	attr = device_get_dma_attr(dev);
+	if (attr == DEV_DMA_NOT_SUPPORTED) {
+		dev_err(dev, "DMA is not supported");
+		goto err_io;
+	}
+	pdata->coherent = (attr == DEV_DMA_COHERENT);
 	if (pdata->coherent) {
 		pdata->axdomain = XGBE_DMA_OS_AXDOMAIN;
 		pdata->arcache = XGBE_DMA_OS_ARCACHE;
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index ff27177f49ed..b1449f71601c 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -143,26 +143,6 @@ void of_pci_check_probe_only(void)
 }
 EXPORT_SYMBOL_GPL(of_pci_check_probe_only);
 
-/**
- * of_pci_dma_configure - Setup DMA configuration
- * @dev: ptr to pci_dev struct of the PCI device
- *
- * Function to update PCI devices's DMA configuration using the same
- * info from the OF node of host bridge's parent (if any).
- */
-void of_pci_dma_configure(struct pci_dev *pci_dev)
-{
-	struct device *dev = &pci_dev->dev;
-	struct device *bridge = pci_get_host_bridge_device(pci_dev);
-
-	if (!bridge->parent)
-		return;
-
-	of_dma_configure(dev, bridge->parent->of_node);
-	pci_put_host_bridge_device(bridge);
-}
-EXPORT_SYMBOL_GPL(of_pci_dma_configure);
-
 #if defined(CONFIG_OF_ADDRESS)
 /**
  * of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index f53b8e85f137..e735c728e3b3 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -6,6 +6,7 @@
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/pci.h>
+#include <linux/of_device.h>
 #include <linux/of_pci.h>
 #include <linux/pci_hotplug.h>
 #include <linux/slab.h>
@@ -13,6 +14,7 @@
 #include <linux/cpumask.h>
 #include <linux/pci-aspm.h>
 #include <linux/aer.h>
+#include <linux/acpi.h>
 #include <asm-generic/pci-bridge.h>
 #include "pci.h"
 
@@ -1672,6 +1674,34 @@ static void pci_set_msi_domain(struct pci_dev *dev)
 	dev_set_msi_domain(&dev->dev, d);
 }
 
+/**
+ * pci_dma_configure - Setup DMA configuration
+ * @dev: ptr to pci_dev struct of the PCI device
+ *
+ * Function to update PCI devices's DMA configuration using the same
+ * info from the OF node or ACPI node of host bridge's parent (if any).
+ */
+static void pci_dma_configure(struct pci_dev *dev)
+{
+	struct device *bridge = pci_get_host_bridge_device(dev);
+
+	if (IS_ENABLED(CONFIG_OF) && dev->dev.of_node) {
+		if (bridge->parent)
+			of_dma_configure(&dev->dev, bridge->parent->of_node);
+	} else if (has_acpi_companion(bridge)) {
+		struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
+		enum dev_dma_attr attr = acpi_get_dma_attr(adev);
+
+		if (attr == DEV_DMA_NOT_SUPPORTED)
+			dev_warn(&dev->dev, "DMA not supported.\n");
+		else
+			arch_setup_dma_ops(&dev->dev, 0, 0, NULL,
+					   attr == DEV_DMA_COHERENT);
+	}
+
+	pci_put_host_bridge_device(bridge);
+}
+
 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
 {
 	int ret;
@@ -1685,7 +1715,7 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
 	dev->dev.dma_mask = &dev->dma_mask;
 	dev->dev.dma_parms = &dev->dma_parms;
 	dev->dev.coherent_dma_mask = 0xffffffffull;
-	of_pci_dma_configure(dev);
+	pci_dma_configure(dev);
 
 	pci_set_dma_max_seg_size(dev, 65536);
 	pci_set_dma_seg_boundary(dev, 0xffffffff);