drm/amd/display: Try RGB before YCbCr 4:4:4 in stream validationgrafted

amdgpu_dm_create_validate_stream_for_sink() walks encoding_order[] and
uses the first encoding that validates. YCbCr 4:4:4 is listed before
RGB, so an HDMI sink that advertises 4:4:4 gets YCbCr 4:4:4 whenever the
"color format" property is left at AUTO, even though RGB fits the same
link.

That contradicts the documented AUTO behaviour for HDMI in enum
drm_connector_color_format (RGB, falling back to YCbCr 4:2:0 only when
the bandwidth is not available or the mode is 4:2:0-only), which the
amdgpu implementation of the property also describes. It also leaves
the "Broadcast RGB" property without effect on such sinks, since the
quantization range it selects only applies to RGB output.

Try RGB first. The mask still holds every encoding the sink supports,
so a mode that cannot carry RGB falls back exactly as before.

For reference, v7.2 picked RGB here unless YCbCr 4:4:4 was forced
through debugfs, while earlier kernels picked YCbCr 4:4:4 for any HDMI
sink that advertised it.

Fixes: 0b0ff65d3ca1 ("drm/amd/display: Refactor stream validation")
Suggested-by: Adolfo Rodrigues <adolfotregosa@gmail.com>
Assisted-by: Claude Code:claude-fable-5-1
Signed-off-by: Adrian Betschart <adrian.betschart@cinemaone.ch>
Reviewed-by: Fangzhi Zuo <jerry.zuo@amd.com>
Tested-by: Adolfo Rodrigues <adolfotregosa@gmail.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 7de432bc753133764dc40d37f9388da56de251e7)

4 files changed, 1161 insertions, 0 deletions

diff --git a/drivers/soc/xilinx/Kconfig b/drivers/soc/xilinx/Kconfig
new file mode 100644
index 000000000..49d69d6e1
--- /dev/null
+++ b/drivers/soc/xilinx/Kconfig
@@ -0,0 +1,29 @@
+# SPDX-License-Identifier: GPL-2.0
+menu "Xilinx SoC drivers"
+
+config ZYNQMP_POWER
+	bool "Enable Xilinx Zynq MPSoC Power Management driver"
+	depends on PM && ZYNQMP_FIRMWARE
+	default y
+	select MAILBOX
+	select ZYNQMP_IPI_MBOX
+	help
+	  Say yes to enable power management support for ZyqnMP SoC.
+	  This driver uses firmware driver as an interface for power
+	  management request to firmware. It registers isr to handle
+	  power management callbacks from firmware. It registers mailbox client
+	  to handle power management callbacks from firmware.
+
+	  If in doubt, say N.
+
+config XLNX_EVENT_MANAGER
+	bool "Enable Xilinx Event Management Driver"
+	depends on ZYNQMP_FIRMWARE
+	default ZYNQMP_FIRMWARE
+	help
+	  Say yes to enable event management support for Xilinx.
+	  This driver uses firmware driver as an interface for event/power
+	  management request to firmware.
+
+	  If in doubt, say N.
+endmenu
diff --git a/drivers/soc/xilinx/Makefile b/drivers/soc/xilinx/Makefile
new file mode 100644
index 000000000..33d94395f
--- /dev/null
+++ b/drivers/soc/xilinx/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_ZYNQMP_POWER)	+= zynqmp_power.o
+obj-$(CONFIG_XLNX_EVENT_MANAGER)	+= xlnx_event_manager.o
diff --git a/drivers/soc/xilinx/xlnx_event_manager.c b/drivers/soc/xilinx/xlnx_event_manager.c
new file mode 100644
index 000000000..f733dc42b
--- /dev/null
+++ b/drivers/soc/xilinx/xlnx_event_manager.c
@@ -0,0 +1,720 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx Event Management Driver
+ *
+ *  Copyright (C) 2021 Xilinx, Inc.
+ *  Copyright (C) 2024 Advanced Micro Devices, Inc.
+ *
+ *  Abhyuday Godhasara <abhyuday.godhasara@xilinx.com>
+ */
+
+#include <linux/cpuhotplug.h>
+#include <linux/firmware/xlnx-event-manager.h>
+#include <linux/firmware/xlnx-zynqmp.h>
+#include <linux/hashtable.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+static DEFINE_PER_CPU_READ_MOSTLY(int, dummy_cpu_number);
+
+static int virq_sgi;
+static int event_manager_availability = -EACCES;
+
+/* SGI number used for Event management driver */
+#define XLNX_EVENT_SGI_NUM	(15)
+
+/* Max number of driver can register for same event */
+#define MAX_DRIVER_PER_EVENT	(10U)
+
+/* Max HashMap Order for PM API feature check (1<<7 = 128) */
+#define REGISTERED_DRIVER_MAX_ORDER	(7)
+
+#define MAX_BITS	(32U) /* Number of bits available for error mask */
+
+#define REGISTER_NOTIFIER_FIRMWARE_VERSION	(2U)
+
+static DEFINE_HASHTABLE(reg_driver_map, REGISTERED_DRIVER_MAX_ORDER);
+static int sgi_num = XLNX_EVENT_SGI_NUM;
+
+static bool is_need_to_unregister;
+
+/**
+ * struct agent_cb - Registered callback function and private data.
+ * @agent_data:		Data passed back to handler function.
+ * @eve_cb:		Function pointer to store the callback function.
+ * @list:		member to create list.
+ */
+struct agent_cb {
+	void *agent_data;
+	event_cb_func_t eve_cb;
+	struct list_head list;
+};
+
+/**
+ * struct registered_event_data - Registered Event Data.
+ * @key:		key is the combine id(Node-Id | Event-Id) of type u64
+ *			where upper u32 for Node-Id and lower u32 for Event-Id,
+ *			And this used as key to index into hashmap.
+ * @cb_type:		Type of Api callback, like PM_NOTIFY_CB, etc.
+ * @wake:		If this flag set, firmware will wake up processor if is
+ *			in sleep or power down state.
+ * @cb_list_head:	Head of call back data list which contain the information
+ *			about registered handler and private data.
+ * @hentry:		hlist_node that hooks this entry into hashtable.
+ */
+struct registered_event_data {
+	u64 key;
+	enum pm_api_cb_id cb_type;
+	bool wake;
+	struct list_head cb_list_head;
+	struct hlist_node hentry;
+};
+
+static bool xlnx_is_error_event(const u32 node_id)
+{
+	u32 pm_family_code;
+
+	zynqmp_pm_get_family_info(&pm_family_code);
+
+	if (pm_family_code == PM_VERSAL_FAMILY_CODE) {
+		if (node_id == VERSAL_EVENT_ERROR_PMC_ERR1 ||
+		    node_id == VERSAL_EVENT_ERROR_PMC_ERR2 ||
+		    node_id == VERSAL_EVENT_ERROR_PSM_ERR1 ||
+		    node_id == VERSAL_EVENT_ERROR_PSM_ERR2)
+			return true;
+	} else if (pm_family_code == PM_VERSAL_NET_FAMILY_CODE) {
+		if (node_id == VERSAL_NET_EVENT_ERROR_PMC_ERR1 ||
+		    node_id == VERSAL_NET_EVENT_ERROR_PMC_ERR2 ||
+		    node_id == VERSAL_NET_EVENT_ERROR_PMC_ERR3 ||
+		    node_id == VERSAL_NET_EVENT_ERROR_PSM_ERR1 ||
+		    node_id == VERSAL_NET_EVENT_ERROR_PSM_ERR2 ||
+		    node_id == VERSAL_NET_EVENT_ERROR_PSM_ERR3 ||
+		    node_id == VERSAL_NET_EVENT_ERROR_PSM_ERR4)
+			return true;
+	}
+
+	return false;
+}
+
+static int xlnx_add_cb_for_notify_event(const u32 node_id, const u32 event, const bool wake,
+					event_cb_func_t cb_fun,	void *data)
+{
+	u64 key = 0;
+	bool present_in_hash = false;
+	struct registered_event_data *eve_data;
+	struct agent_cb *cb_data;
+	struct agent_cb *cb_pos;
+	struct agent_cb *cb_next;
+
+	key = ((u64)node_id << 32U) | (u64)event;
+	/* Check for existing entry in hash table for given key id */
+	hash_for_each_possible(reg_driver_map, eve_data, hentry, key) {
+		if (eve_data->key == key) {
+			present_in_hash = true;
+			break;
+		}
+	}
+
+	if (!present_in_hash) {
+		/* Add new entry if not present in HASH table */
+		eve_data = kmalloc_obj(*eve_data);
+		if (!eve_data)
+			return -ENOMEM;
+		eve_data->key = key;
+		eve_data->cb_type = PM_NOTIFY_CB;
+		eve_data->wake = wake;
+		INIT_LIST_HEAD(&eve_data->cb_list_head);
+
+		cb_data = kmalloc_obj(*cb_data);
+		if (!cb_data) {
+			kfree(eve_data);
+			return -ENOMEM;
+		}
+		cb_data->eve_cb = cb_fun;
+		cb_data->agent_data = data;
+
+		/* Add into callback list */
+		list_add(&cb_data->list, &eve_data->cb_list_head);
+
+		/* Add into HASH table */
+		hash_add(reg_driver_map, &eve_data->hentry, key);
+	} else {
+		/* Search for callback function and private data in list */
+		list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) {
+			if (cb_pos->eve_cb == cb_fun &&
+			    cb_pos->agent_data == data) {
+				return 0;
+			}
+		}
+
+		/* Add multiple handler and private data in list */
+		cb_data = kmalloc_obj(*cb_data);
+		if (!cb_data)
+			return -ENOMEM;
+		cb_data->eve_cb = cb_fun;
+		cb_data->agent_data = data;
+
+		list_add(&cb_data->list, &eve_data->cb_list_head);
+	}
+
+	return 0;
+}
+
+static int xlnx_add_cb_for_suspend(event_cb_func_t cb_fun, void *data)
+{
+	struct registered_event_data *eve_data;
+	struct agent_cb *cb_data;
+
+	/* Check for existing entry in hash table for given cb_type */
+	hash_for_each_possible(reg_driver_map, eve_data, hentry, PM_INIT_SUSPEND_CB) {
+		if (eve_data->cb_type == PM_INIT_SUSPEND_CB) {
+			pr_err("Found as already registered\n");
+			return -EINVAL;
+		}
+	}
+
+	/* Add new entry if not present */
+	eve_data = kmalloc_obj(*eve_data);
+	if (!eve_data)
+		return -ENOMEM;
+
+	eve_data->key = 0;
+	eve_data->cb_type = PM_INIT_SUSPEND_CB;
+	INIT_LIST_HEAD(&eve_data->cb_list_head);
+
+	cb_data = kmalloc_obj(*cb_data);
+	if (!cb_data) {
+		kfree(eve_data);
+		return -ENOMEM;
+	}
+	cb_data->eve_cb = cb_fun;
+	cb_data->agent_data = data;
+
+	/* Add into callback list */
+	list_add(&cb_data->list, &eve_data->cb_list_head);
+
+	hash_add(reg_driver_map, &eve_data->hentry, PM_INIT_SUSPEND_CB);
+
+	return 0;
+}
+
+static int xlnx_remove_cb_for_suspend(event_cb_func_t cb_fun)
+{
+	bool is_callback_found = false;
+	struct registered_event_data *eve_data;
+	struct agent_cb *cb_pos;
+	struct agent_cb *cb_next;
+	struct hlist_node *tmp;
+
+	is_need_to_unregister = false;
+
+	/* Check for existing entry in hash table for given cb_type */
+	hash_for_each_possible_safe(reg_driver_map, eve_data, tmp, hentry, PM_INIT_SUSPEND_CB) {
+		if (eve_data->cb_type == PM_INIT_SUSPEND_CB) {
+			/* Delete the list of callback */
+			list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) {
+				if (cb_pos->eve_cb == cb_fun) {
+					is_callback_found = true;
+					list_del_init(&cb_pos->list);
+					kfree(cb_pos);
+				}
+			}
+			/* remove an object from a hashtable */
+			hash_del(&eve_data->hentry);
+			kfree(eve_data);
+			is_need_to_unregister = true;
+		}
+	}
+	if (!is_callback_found) {
+		pr_warn("Didn't find any registered callback for suspend event\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int xlnx_remove_cb_for_notify_event(const u32 node_id, const u32 event,
+					   event_cb_func_t cb_fun, void *data)
+{
+	bool is_callback_found = false;
+	struct registered_event_data *eve_data;
+	u64 key = ((u64)node_id << 32U) | (u64)event;
+	struct agent_cb *cb_pos;
+	struct agent_cb *cb_next;
+	struct hlist_node *tmp;
+
+	is_need_to_unregister = false;
+
+	/* Check for existing entry in hash table for given key id */
+	hash_for_each_possible_safe(reg_driver_map, eve_data, tmp, hentry, key) {
+		if (eve_data->key == key) {
+			/* Delete the list of callback */
+			list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) {
+				if (cb_pos->eve_cb == cb_fun &&
+				    cb_pos->agent_data == data) {
+					is_callback_found = true;
+					list_del_init(&cb_pos->list);
+					kfree(cb_pos);
+				}
+			}
+
+			/* Remove HASH table if callback list is empty */
+			if (list_empty(&eve_data->cb_list_head)) {
+				/* remove an object from a HASH table */
+				hash_del(&eve_data->hentry);
+				kfree(eve_data);
+				is_need_to_unregister = true;
+			}
+		}
+	}
+	if (!is_callback_found) {
+		pr_warn("Didn't find any registered callback for 0x%x 0x%x\n",
+			node_id, event);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/**
+ * xlnx_register_event() - Register for the event.
+ * @cb_type:	Type of callback from pm_api_cb_id,
+ *			PM_NOTIFY_CB - for Error Events,
+ *			PM_INIT_SUSPEND_CB - for suspend callback.
+ * @node_id:	Node-Id related to event.
+ * @event:	Event Mask for the Error Event.
+ * @wake:	Flag specifying whether the subsystem should be woken upon
+ *		event notification.
+ * @cb_fun:	Function pointer to store the callback function.
+ * @data:	Pointer for the driver instance.
+ *
+ * Return:	Returns 0 on successful registration else error code.
+ */
+int xlnx_register_event(const enum pm_api_cb_id cb_type, const u32 node_id, const u32 event,
+			const bool wake, event_cb_func_t cb_fun, void *data)
+{
+	int ret = 0;
+	u32 eve;
+	int pos;
+
+	if (event_manager_availability)
+		return event_manager_availability;
+
+	if (cb_type != PM_NOTIFY_CB && cb_type != PM_INIT_SUSPEND_CB) {
+		pr_err("%s() Unsupported Callback 0x%x\n", __func__, cb_type);
+		return -EINVAL;
+	}
+
+	if (!cb_fun)
+		return -EFAULT;
+
+	if (cb_type == PM_INIT_SUSPEND_CB) {
+		ret = xlnx_add_cb_for_suspend(cb_fun, data);
+	} else {
+		if (!xlnx_is_error_event(node_id)) {
+			/* Add entry for Node-Id/Event in hash table */
+			ret = xlnx_add_cb_for_notify_event(node_id, event, wake, cb_fun, data);
+		} else {
+			/* Add into Hash table */
+			for (pos = 0; pos < MAX_BITS; pos++) {
+				eve = event & (1 << pos);
+				if (!eve)
+					continue;
+
+				/* Add entry for Node-Id/Eve in hash table */
+				ret = xlnx_add_cb_for_notify_event(node_id, eve, wake, cb_fun,
+								   data);
+				/* Break the loop if got error */
+				if (ret)
+					break;
+			}
+			if (ret) {
+				/* Skip the Event for which got the error */
+				pos--;
+				/* Remove registered(during this call) event from hash table */
+				for ( ; pos >= 0; pos--) {
+					eve = event & (1 << pos);
+					if (!eve)
+						continue;
+					xlnx_remove_cb_for_notify_event(node_id, eve, cb_fun, data);
+				}
+			}
+		}
+
+		if (ret) {
+			pr_err("%s() failed for 0x%x and 0x%x: %d\r\n", __func__, node_id,
+			       event, ret);
+			return ret;
+		}
+
+		/* Register for Node-Id/Event combination in firmware */
+		ret = zynqmp_pm_register_notifier(node_id, event, wake, true);
+		if (ret) {
+			pr_err("%s() failed for 0x%x and 0x%x: %d\r\n", __func__, node_id,
+			       event, ret);
+			/* Remove already registered event from hash table */
+			if (xlnx_is_error_event(node_id)) {
+				for (pos = 0; pos < MAX_BITS; pos++) {
+					eve = event & (1 << pos);
+					if (!eve)
+						continue;
+					xlnx_remove_cb_for_notify_event(node_id, eve, cb_fun, data);
+				}
+			} else {
+				xlnx_remove_cb_for_notify_event(node_id, event, cb_fun, data);
+			}
+			return ret;
+		}
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(xlnx_register_event);
+
+/**
+ * xlnx_unregister_event() - Unregister for the event.
+ * @cb_type:	Type of callback from pm_api_cb_id,
+ *			PM_NOTIFY_CB - for Error Events,
+ *			PM_INIT_SUSPEND_CB - for suspend callback.
+ * @node_id:	Node-Id related to event.
+ * @event:	Event Mask for the Error Event.
+ * @cb_fun:	Function pointer of callback function.
+ * @data:	Pointer of agent's private data.
+ *
+ * Return:	Returns 0 on successful unregistration else error code.
+ */
+int xlnx_unregister_event(const enum pm_api_cb_id cb_type, const u32 node_id, const u32 event,
+			  event_cb_func_t cb_fun, void *data)
+{
+	int ret = 0;
+	u32 eve, pos;
+
+	is_need_to_unregister = false;
+
+	if (event_manager_availability)
+		return event_manager_availability;
+
+	if (cb_type != PM_NOTIFY_CB && cb_type != PM_INIT_SUSPEND_CB) {
+		pr_err("%s() Unsupported Callback 0x%x\n", __func__, cb_type);
+		return -EINVAL;
+	}
+
+	if (!cb_fun)
+		return -EFAULT;
+
+	if (cb_type == PM_INIT_SUSPEND_CB) {
+		ret = xlnx_remove_cb_for_suspend(cb_fun);
+	} else {
+		/* Remove Node-Id/Event from hash table */
+		if (!xlnx_is_error_event(node_id)) {
+			xlnx_remove_cb_for_notify_event(node_id, event, cb_fun, data);
+		} else {
+			for (pos = 0; pos < MAX_BITS; pos++) {
+				eve = event & (1 << pos);
+				if (!eve)
+					continue;
+
+				xlnx_remove_cb_for_notify_event(node_id, eve, cb_fun, data);
+			}
+		}
+
+		/* Un-register if list is empty */
+		if (is_need_to_unregister) {
+			/* Un-register for Node-Id/Event combination */
+			ret = zynqmp_pm_register_notifier(node_id, event, false, false);
+			if (ret) {
+				pr_err("%s() failed for 0x%x and 0x%x: %d\n",
+				       __func__, node_id, event, ret);
+				return ret;
+			}
+		}
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(xlnx_unregister_event);
+
+static void xlnx_call_suspend_cb_handler(const u32 *payload)
+{
+	bool is_callback_found = false;
+	struct registered_event_data *eve_data;
+	u32 cb_type = payload[0];
+	struct agent_cb *cb_pos;
+	struct agent_cb *cb_next;
+
+	/* Check for existing entry in hash table for given cb_type */
+	hash_for_each_possible(reg_driver_map, eve_data, hentry, cb_type) {
+		if (eve_data->cb_type == cb_type) {
+			list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) {
+				cb_pos->eve_cb(&payload[0], cb_pos->agent_data);
+				is_callback_found = true;
+			}
+		}
+	}
+	if (!is_callback_found)
+		pr_warn("Didn't find any registered callback for suspend event\n");
+}
+
+static void xlnx_call_notify_cb_handler(const u32 *payload)
+{
+	bool is_callback_found = false;
+	struct registered_event_data *eve_data;
+	u64 key = ((u64)payload[1] << 32U) | (u64)payload[2];
+	int ret;
+	struct agent_cb *cb_pos;
+	struct agent_cb *cb_next;
+
+	/* Check for existing entry in hash table for given key id */
+	hash_for_each_possible(reg_driver_map, eve_data, hentry, key) {
+		if (eve_data->key == key) {
+			list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) {
+				cb_pos->eve_cb(&payload[0], cb_pos->agent_data);
+				is_callback_found = true;
+			}
+
+			/* re register with firmware to get future events */
+			ret = zynqmp_pm_register_notifier(payload[1], payload[2],
+							  eve_data->wake, true);
+			if (ret) {
+				pr_err("%s() failed for 0x%x and 0x%x: %d\r\n", __func__,
+				       payload[1], payload[2], ret);
+				list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head,
+							 list) {
+					/* Remove already registered event from hash table */
+					xlnx_remove_cb_for_notify_event(payload[1], payload[2],
+									cb_pos->eve_cb,
+									cb_pos->agent_data);
+				}
+			}
+		}
+	}
+	if (!is_callback_found)
+		pr_warn("Unhandled SGI node 0x%x event 0x%x. Expected with Xen hypervisor\n",
+			payload[1], payload[2]);
+}
+
+static void xlnx_get_event_callback_data(u32 *buf)
+{
+	zynqmp_pm_invoke_fn(GET_CALLBACK_DATA, buf, 0);
+}
+
+static irqreturn_t xlnx_event_handler(int irq, void *dev_id)
+{
+	u32 cb_type, node_id, event, pos;
+	u32 payload[CB_MAX_PAYLOAD_SIZE] = {0};
+	u32 event_data[CB_MAX_PAYLOAD_SIZE] = {0};
+
+	/* Get event data */
+	xlnx_get_event_callback_data(payload);
+
+	/* First element is callback type, others are callback arguments */
+	cb_type = payload[0];
+
+	if (cb_type == PM_NOTIFY_CB) {
+		node_id = payload[1];
+		event = payload[2];
+		if (!xlnx_is_error_event(node_id)) {
+			xlnx_call_notify_cb_handler(payload);
+		} else {
+			/*
+			 * Each call back function expecting payload as an input arguments.
+			 * We can get multiple error events as in one call back through error
+			 * mask. So payload[2] may can contain multiple error events.
+			 * In reg_driver_map database we store data in the combination of single
+			 * node_id-error combination.
+			 * So coping the payload message into event_data and update the
+			 * event_data[2] with Error Mask for single error event and use
+			 * event_data as input argument for registered call back function.
+			 *
+			 */
+			memcpy(event_data, payload, (4 * CB_MAX_PAYLOAD_SIZE));
+			/* Support Multiple Error Event */
+			for (pos = 0; pos < MAX_BITS; pos++) {
+				if ((0 == (event & (1 << pos))))
+					continue;
+				event_data[2] = (event & (1 << pos));
+				xlnx_call_notify_cb_handler(event_data);
+			}
+		}
+	} else if (cb_type == PM_INIT_SUSPEND_CB) {
+		xlnx_call_suspend_cb_handler(payload);
+	} else {
+		pr_err("%s() Unsupported Callback %d\n", __func__, cb_type);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int xlnx_event_cpuhp_start(unsigned int cpu)
+{
+	enable_percpu_irq(virq_sgi, IRQ_TYPE_NONE);
+
+	return 0;
+}
+
+static int xlnx_event_cpuhp_down(unsigned int cpu)
+{
+	disable_percpu_irq(virq_sgi);
+
+	return 0;
+}
+
+static void xlnx_disable_percpu_irq(void *data)
+{
+	disable_percpu_irq(virq_sgi);
+}
+
+static int xlnx_event_init_sgi(struct platform_device *pdev)
+{
+	int ret = 0;
+	/*
+	 * IRQ related structures are used for the following:
+	 * for each SGI interrupt ensure its mapped by GIC IRQ domain
+	 * and that each corresponding linux IRQ for the HW IRQ has
+	 * a handler for when receiving an interrupt from the remote
+	 * processor.
+	 */
+	struct irq_domain *domain;
+	struct irq_fwspec sgi_fwspec;
+	struct device_node *interrupt_parent = NULL;
+	struct device *parent = pdev->dev.parent;
+
+	/* Find GIC controller to map SGIs. */
+	interrupt_parent = of_irq_find_parent(parent->of_node);
+	if (!interrupt_parent) {
+		dev_err(&pdev->dev, "Failed to find property for Interrupt parent\n");
+		return -EINVAL;
+	}
+
+	/* Each SGI needs to be associated with GIC's IRQ domain. */
+	domain = irq_find_host(interrupt_parent);
+	of_node_put(interrupt_parent);
+
+	/* Each mapping needs GIC domain when finding IRQ mapping. */
+	sgi_fwspec.fwnode = domain->fwnode;
+
+	/*
+	 * When irq domain looks at mapping each arg is as follows:
+	 * 3 args for: interrupt type (SGI), interrupt # (set later), type
+	 */
+	sgi_fwspec.param_count = 1;
+
+	/* Set SGI's hwirq */
+	sgi_fwspec.param[0] = sgi_num;
+	virq_sgi = irq_create_fwspec_mapping(&sgi_fwspec);
+
+	ret = request_percpu_irq(virq_sgi, xlnx_event_handler, "xlnx_event_mgmt",
+				 &dummy_cpu_number);
+
+	WARN_ON(ret);
+	if (ret) {
+		irq_dispose_mapping(virq_sgi);
+		return ret;
+	}
+
+	irq_to_desc(virq_sgi);
+	irq_set_status_flags(virq_sgi, IRQ_PER_CPU);
+
+	return ret;
+}
+
+static void xlnx_event_cleanup_sgi(struct platform_device *pdev)
+{
+	cpuhp_remove_state(CPUHP_AP_ONLINE_DYN);
+
+	on_each_cpu(xlnx_disable_percpu_irq, NULL, 1);
+
+	irq_clear_status_flags(virq_sgi, IRQ_PER_CPU);
+	free_percpu_irq(virq_sgi, &dummy_cpu_number);
+	irq_dispose_mapping(virq_sgi);
+}
+
+static int xlnx_event_manager_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	ret = zynqmp_pm_feature(PM_REGISTER_NOTIFIER);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Feature check failed with %d\n", ret);
+		return ret;
+	}
+
+	if ((ret & FIRMWARE_VERSION_MASK) <
+	    REGISTER_NOTIFIER_FIRMWARE_VERSION) {
+		dev_err(&pdev->dev, "Register notifier version error. Expected Firmware: v%d - Found: v%d\n",
+			REGISTER_NOTIFIER_FIRMWARE_VERSION,
+			ret & FIRMWARE_VERSION_MASK);
+		return -EOPNOTSUPP;
+	}
+
+	/* Initialize the SGI */
+	ret = xlnx_event_init_sgi(pdev);
+	if (ret) {
+		dev_err(&pdev->dev, "SGI Init has been failed with %d\n", ret);
+		return ret;
+	}
+
+	/* Setup function for the CPU hot-plug cases */
+	cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "soc/event:starting",
+			  xlnx_event_cpuhp_start, xlnx_event_cpuhp_down);
+
+	ret = zynqmp_pm_register_sgi(sgi_num, 0);
+	if (ret) {
+		if (ret == -EOPNOTSUPP)
+			dev_err(&pdev->dev, "SGI registration not supported by TF-A or Xen\n");
+		else
+			dev_err(&pdev->dev, "SGI %d registration failed, err %d\n", sgi_num, ret);
+
+		xlnx_event_cleanup_sgi(pdev);
+		return ret;
+	}
+
+	event_manager_availability = 0;
+
+	dev_info(&pdev->dev, "SGI %d Registered over TF-A\n", sgi_num);
+	dev_info(&pdev->dev, "Xilinx Event Management driver probed\n");
+
+	return ret;
+}
+
+static void xlnx_event_manager_remove(struct platform_device *pdev)
+{
+	int i;
+	struct registered_event_data *eve_data;
+	struct hlist_node *tmp;
+	int ret;
+	struct agent_cb *cb_pos;
+	struct agent_cb *cb_next;
+
+	hash_for_each_safe(reg_driver_map, i, tmp, eve_data, hentry) {
+		list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) {
+			list_del_init(&cb_pos->list);
+			kfree(cb_pos);
+		}
+		hash_del(&eve_data->hentry);
+		kfree(eve_data);
+	}
+
+	ret = zynqmp_pm_register_sgi(0, 1);
+	if (ret)
+		dev_err(&pdev->dev, "SGI unregistration over TF-A failed with %d\n", ret);
+
+	xlnx_event_cleanup_sgi(pdev);
+
+	event_manager_availability = -EACCES;
+}
+
+static struct platform_driver xlnx_event_manager_driver = {
+	.probe = xlnx_event_manager_probe,
+	.remove = xlnx_event_manager_remove,
+	.driver = {
+		.name = "xlnx_event_manager",
+	},
+};
+module_param(sgi_num, uint, 0);
+module_platform_driver(xlnx_event_manager_driver);
diff --git a/drivers/soc/xilinx/zynqmp_power.c b/drivers/soc/xilinx/zynqmp_power.c
new file mode 100644
index 000000000..54c796afb
--- /dev/null
+++ b/drivers/soc/xilinx/zynqmp_power.c
@@ -0,0 +1,409 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx Zynq MPSoC Power Management
+ *
+ *  Copyright (C) 2014-2019 Xilinx, Inc.
+ *
+ *  Davorin Mista <davorin.mista@aggios.com>
+ *  Jolly Shah <jollys@xilinx.com>
+ *  Rajan Vaja <rajan.vaja@xilinx.com>
+ */
+
+#include <linux/mailbox_client.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/suspend.h>
+
+#include <linux/firmware/xlnx-zynqmp.h>
+#include <linux/firmware/xlnx-event-manager.h>
+#include <linux/mailbox/zynqmp-ipi-message.h>
+
+/**
+ * struct zynqmp_pm_work_struct - Wrapper for struct work_struct
+ * @callback_work:	Work structure
+ * @args:		Callback arguments
+ */
+struct zynqmp_pm_work_struct {
+	struct work_struct callback_work;
+	u32 args[CB_ARG_CNT];
+};
+
+/**
+ * struct zynqmp_pm_event_info - event related information
+ * @cb_fun:	Function pointer to store the callback function.
+ * @cb_type:	Type of callback from pm_api_cb_id,
+ *			PM_NOTIFY_CB - for Error Events,
+ *			PM_INIT_SUSPEND_CB - for suspend callback.
+ * @node_id:	Node-Id related to event.
+ * @event:	Event Mask for the Error Event.
+ * @wake:	Flag specifying whether the subsystem should be woken upon
+ *		event notification.
+ */
+struct zynqmp_pm_event_info {
+	event_cb_func_t cb_fun;
+	enum pm_api_cb_id cb_type;
+	u32 node_id;
+	u32 event;
+	bool wake;
+};
+
+static struct zynqmp_pm_work_struct *zynqmp_pm_init_suspend_work, *zynqmp_pm_init_restart_work;
+static struct mbox_chan *rx_chan;
+
+enum pm_suspend_mode {
+	PM_SUSPEND_MODE_FIRST = 0,
+	PM_SUSPEND_MODE_STD = PM_SUSPEND_MODE_FIRST,
+	PM_SUSPEND_MODE_POWER_OFF,
+};
+
+#define PM_SUSPEND_MODE_FIRST	PM_SUSPEND_MODE_STD
+
+static const char *const suspend_modes[] = {
+	[PM_SUSPEND_MODE_STD] = "standard",
+	[PM_SUSPEND_MODE_POWER_OFF] = "power-off",
+};
+
+static enum pm_suspend_mode suspend_mode = PM_SUSPEND_MODE_STD;
+
+static void zynqmp_pm_get_callback_data(u32 *buf)
+{
+	zynqmp_pm_invoke_fn(GET_CALLBACK_DATA, buf, 0);
+}
+
+static void subsystem_restart_event_callback(const u32 *payload, void *data)
+{
+	/* First element is callback API ID, others are callback arguments */
+	if (work_pending(&zynqmp_pm_init_restart_work->callback_work))
+		return;
+
+	/* Copy callback arguments into work's structure */
+	memcpy(zynqmp_pm_init_restart_work->args, &payload[0],
+	       sizeof(zynqmp_pm_init_restart_work->args));
+
+	queue_work(system_dfl_wq, &zynqmp_pm_init_restart_work->callback_work);
+}
+
+static void suspend_event_callback(const u32 *payload, void *data)
+{
+	/* First element is callback API ID, others are callback arguments */
+	if (work_pending(&zynqmp_pm_init_suspend_work->callback_work))
+		return;
+
+	/* Copy callback arguments into work's structure */
+	memcpy(zynqmp_pm_init_suspend_work->args, &payload[1],
+	       sizeof(zynqmp_pm_init_suspend_work->args));
+
+	queue_work(system_dfl_wq, &zynqmp_pm_init_suspend_work->callback_work);
+}
+
+static irqreturn_t zynqmp_pm_isr(int irq, void *data)
+{
+	u32 payload[CB_PAYLOAD_SIZE];
+
+	zynqmp_pm_get_callback_data(payload);
+
+	/* First element is callback API ID, others are callback arguments */
+	if (payload[0] == PM_INIT_SUSPEND_CB) {
+		switch (payload[1]) {
+		case SUSPEND_SYSTEM_SHUTDOWN:
+			orderly_poweroff(true);
+			break;
+		case SUSPEND_POWER_REQUEST:
+			pm_suspend(PM_SUSPEND_MEM);
+			break;
+		default:
+			pr_err("%s Unsupported InitSuspendCb reason code %d\n",
+			       __func__, payload[1]);
+		}
+	} else {
+		pr_err("%s() Unsupported Callback %d\n", __func__, payload[0]);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void ipi_receive_callback(struct mbox_client *cl, void *data)
+{
+	struct zynqmp_ipi_message *msg = (struct zynqmp_ipi_message *)data;
+	u32 payload[CB_PAYLOAD_SIZE];
+	int ret;
+
+	memcpy(payload, msg->data, sizeof(msg->len));
+	/* First element is callback API ID, others are callback arguments */
+	if (payload[0] == PM_INIT_SUSPEND_CB) {
+		if (work_pending(&zynqmp_pm_init_suspend_work->callback_work))
+			return;
+
+		/* Copy callback arguments into work's structure */
+		memcpy(zynqmp_pm_init_suspend_work->args, &payload[1],
+		       sizeof(zynqmp_pm_init_suspend_work->args));
+
+		queue_work(system_dfl_wq,
+			   &zynqmp_pm_init_suspend_work->callback_work);
+
+		/* Send NULL message to mbox controller to ack the message */
+		ret = mbox_send_message(rx_chan, NULL);
+		if (ret)
+			pr_err("IPI ack failed. Error %d\n", ret);
+	}
+}
+
+/**
+ * zynqmp_pm_subsystem_restart_work_fn - Initiate Subsystem restart
+ * @work:	Pointer to work_struct
+ *
+ * Bottom-half of PM callback IRQ handler.
+ */
+static void zynqmp_pm_subsystem_restart_work_fn(struct work_struct *work)
+{
+	int ret;
+	struct zynqmp_pm_work_struct *pm_work = container_of(work, struct zynqmp_pm_work_struct,
+							     callback_work);
+
+	/* First element is callback API ID, others are callback arguments */
+	if (pm_work->args[0] == PM_NOTIFY_CB) {
+		if (pm_work->args[2] == EVENT_SUBSYSTEM_RESTART) {
+			ret = zynqmp_pm_system_shutdown(ZYNQMP_PM_SHUTDOWN_TYPE_SETSCOPE_ONLY,
+							ZYNQMP_PM_SHUTDOWN_SUBTYPE_SUBSYSTEM);
+			if (ret) {
+				pr_err("unable to set shutdown scope\n");
+				return;
+			}
+
+			kernel_restart(NULL);
+		} else {
+			pr_err("%s Unsupported Event - %d\n", __func__, pm_work->args[2]);
+		}
+	} else {
+		pr_err("%s() Unsupported Callback %d\n", __func__, pm_work->args[0]);
+	}
+}
+
+/**
+ * zynqmp_pm_init_suspend_work_fn - Initialize suspend
+ * @work:	Pointer to work_struct
+ *
+ * Bottom-half of PM callback IRQ handler.
+ */
+static void zynqmp_pm_init_suspend_work_fn(struct work_struct *work)
+{
+	struct zynqmp_pm_work_struct *pm_work =
+		container_of(work, struct zynqmp_pm_work_struct, callback_work);
+
+	if (pm_work->args[0] == SUSPEND_SYSTEM_SHUTDOWN) {
+		orderly_poweroff(true);
+	} else if (pm_work->args[0] == SUSPEND_POWER_REQUEST) {
+		pm_suspend(PM_SUSPEND_MEM);
+	} else {
+		pr_err("%s Unsupported InitSuspendCb reason code %d.\n",
+		       __func__, pm_work->args[0]);
+	}
+}
+
+static ssize_t suspend_mode_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	char *s = buf;
+	int md;
+
+	for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++)
+		if (suspend_modes[md]) {
+			if (md == suspend_mode)
+				s += sprintf(s, "[%s] ", suspend_modes[md]);
+			else
+				s += sprintf(s, "%s ", suspend_modes[md]);
+		}
+
+	/* Convert last space to newline */
+	if (s != buf)
+		*(s - 1) = '\n';
+	return (s - buf);
+}
+
+static ssize_t suspend_mode_store(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf, size_t count)
+{
+	int md, ret = -EINVAL;
+
+	for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++)
+		if (suspend_modes[md] &&
+		    sysfs_streq(suspend_modes[md], buf)) {
+			ret = 0;
+			break;
+		}
+
+	if (!ret && md != suspend_mode) {
+		ret = zynqmp_pm_set_suspend_mode(md);
+		if (likely(!ret))
+			suspend_mode = md;
+	}
+
+	return ret ? ret : count;
+}
+
+static DEVICE_ATTR_RW(suspend_mode);
+
+static void unregister_event(struct device *dev, void *res)
+{
+	struct zynqmp_pm_event_info *event_info = res;
+
+	xlnx_unregister_event(event_info->cb_type, event_info->node_id,
+			      event_info->event, event_info->cb_fun, NULL);
+}
+
+static int register_event(struct device *dev, const enum pm_api_cb_id cb_type, const u32 node_id,
+			  const u32 event, const bool wake, event_cb_func_t cb_fun)
+{
+	int ret;
+	struct zynqmp_pm_event_info *event_info;
+
+	event_info = devres_alloc(unregister_event, sizeof(struct zynqmp_pm_event_info),
+				  GFP_KERNEL);
+	if (!event_info)
+		return -ENOMEM;
+
+	event_info->cb_type = cb_type;
+	event_info->node_id = node_id;
+	event_info->event = event;
+	event_info->wake = wake;
+	event_info->cb_fun = cb_fun;
+
+	ret = xlnx_register_event(event_info->cb_type, event_info->node_id,
+				  event_info->event, event_info->wake, event_info->cb_fun, NULL);
+	if (ret) {
+		devres_free(event_info);
+		return ret;
+	}
+
+	devres_add(dev, event_info);
+	return 0;
+}
+
+static int zynqmp_pm_probe(struct platform_device *pdev)
+{
+	int ret, irq;
+	u32 pm_api_version, pm_family_code, node_id;
+	struct mbox_client *client;
+
+	ret = zynqmp_pm_get_api_version(&pm_api_version);
+	if (ret)
+		return ret;
+
+	/* Check PM API version number */
+	if (pm_api_version < ZYNQMP_PM_VERSION)
+		return -ENODEV;
+
+	/*
+	 * First try to use Xilinx Event Manager by registering suspend_event_callback
+	 * for suspend/shutdown event.
+	 * If xlnx_register_event() returns -EACCES (Xilinx Event Manager
+	 * is not available to use) or -ENODEV(Xilinx Event Manager not compiled),
+	 * then use ipi-mailbox or interrupt method.
+	 */
+	zynqmp_pm_init_suspend_work = devm_kzalloc(&pdev->dev,
+						   sizeof(struct zynqmp_pm_work_struct),
+						   GFP_KERNEL);
+	if (!zynqmp_pm_init_suspend_work)
+		return -ENOMEM;
+
+	INIT_WORK(&zynqmp_pm_init_suspend_work->callback_work,
+		  zynqmp_pm_init_suspend_work_fn);
+
+	ret = register_event(&pdev->dev, PM_INIT_SUSPEND_CB, 0, 0, false,
+			     suspend_event_callback);
+	if (!ret) {
+		ret = zynqmp_pm_get_family_info(&pm_family_code);
+		if (ret < 0)
+			return ret;
+
+		if (pm_family_code == PM_VERSAL_NET_FAMILY_CODE)
+			node_id = PM_DEV_ACPU_0_0;
+		else if (pm_family_code == PM_VERSAL_FAMILY_CODE)
+			node_id = PM_DEV_ACPU_0;
+		else
+			return -ENODEV;
+
+		zynqmp_pm_init_restart_work = devm_kzalloc(&pdev->dev,
+							   sizeof(struct zynqmp_pm_work_struct),
+							   GFP_KERNEL);
+		if (!zynqmp_pm_init_restart_work)
+			return -ENOMEM;
+
+		INIT_WORK(&zynqmp_pm_init_restart_work->callback_work,
+			  zynqmp_pm_subsystem_restart_work_fn);
+
+		ret = register_event(&pdev->dev, PM_NOTIFY_CB, node_id, EVENT_SUBSYSTEM_RESTART,
+				     false, subsystem_restart_event_callback);
+		if (ret) {
+			dev_err(&pdev->dev, "Failed to Register with Xilinx Event manager %d\n",
+				ret);
+			return ret;
+		}
+	} else if (ret != -EACCES && ret != -ENODEV) {
+		dev_err(&pdev->dev, "Failed to Register with Xilinx Event manager %d\n", ret);
+		return ret;
+	} else if (of_property_present(pdev->dev.of_node, "mboxes")) {
+		client = devm_kzalloc(&pdev->dev, sizeof(*client), GFP_KERNEL);
+		if (!client)
+			return -ENOMEM;
+
+		client->dev = &pdev->dev;
+		client->rx_callback = ipi_receive_callback;
+
+		rx_chan = mbox_request_channel_byname(client, "rx");
+		if (IS_ERR(rx_chan)) {
+			dev_err(&pdev->dev, "Failed to request rx channel\n");
+			return PTR_ERR(rx_chan);
+		}
+	} else if (of_property_present(pdev->dev.of_node, "interrupts")) {
+		irq = platform_get_irq(pdev, 0);
+		if (irq < 0)
+			return irq;
+
+		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+						zynqmp_pm_isr,
+						IRQF_NO_SUSPEND | IRQF_ONESHOT,
+						dev_name(&pdev->dev),
+						&pdev->dev);
+		if (ret)
+			return ret;
+	} else {
+		dev_err(&pdev->dev, "Required property not found in DT node\n");
+		return -ENOENT;
+	}
+
+	ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void zynqmp_pm_remove(struct platform_device *pdev)
+{
+	sysfs_remove_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
+
+	if (rx_chan) {
+		mbox_free_channel(rx_chan);
+		rx_chan = NULL;
+	}
+}
+
+static const struct of_device_id pm_of_match[] = {
+	{ .compatible = "xlnx,zynqmp-power", },
+	{ /* end of table */ },
+};
+MODULE_DEVICE_TABLE(of, pm_of_match);
+
+static struct platform_driver zynqmp_pm_platform_driver = {
+	.probe = zynqmp_pm_probe,
+	.remove = zynqmp_pm_remove,
+	.driver = {
+		.name = "zynqmp_power",
+		.of_match_table = pm_of_match,
+	},
+};
+module_platform_driver(zynqmp_pm_platform_driver);