Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index d4e5610..da1e5c5 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  ec.c - ACPI Embedded Controller Driver (v3)
  *
@@ -9,20 +10,6 @@
  *            2001, 2002 Andy Grover <andrew.grover@intel.com>
  *            2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  *  Copyright (C) 2008      Alexey Starikovskiy <astarikovskiy@suse.de>
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or (at
- *  your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful, but
- *  WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- *  General Public License for more details.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  */
 
 /* Uncomment next line to get verbose printout */
@@ -38,6 +25,7 @@
 #include <linux/list.h>
 #include <linux/spinlock.h>
 #include <linux/slab.h>
+#include <linux/suspend.h>
 #include <linux/acpi.h>
 #include <linux/dmi.h>
 #include <asm/io.h>
@@ -186,14 +174,17 @@
 static void acpi_ec_event_handler(struct work_struct *work);
 static void acpi_ec_event_processor(struct work_struct *work);
 
-struct acpi_ec *boot_ec, *first_ec;
+struct acpi_ec *first_ec;
 EXPORT_SYMBOL(first_ec);
+
+static struct acpi_ec *boot_ec;
 static bool boot_ec_is_ecdt = false;
 static struct workqueue_struct *ec_query_wq;
 
 static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */
 static int EC_FLAGS_CORRECT_ECDT; /* Needs ECDT port address correction */
 static int EC_FLAGS_IGNORE_DSDT_GPE; /* Needs ECDT GPE as correction setting */
+static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */
 
 /* --------------------------------------------------------------------------
  *                           Logging/Debugging
@@ -499,6 +490,26 @@
 		ec_log_drv("event blocked");
 }
 
+/*
+ * Process _Q events that might have accumulated in the EC.
+ * Run with locked ec mutex.
+ */
+static void acpi_ec_clear(struct acpi_ec *ec)
+{
+	int i, status;
+	u8 value = 0;
+
+	for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) {
+		status = acpi_ec_query(ec, &value);
+		if (status || !value)
+			break;
+	}
+	if (unlikely(i == ACPI_EC_CLEAR_MAX))
+		pr_warn("Warning: Maximum of %d stale EC events cleared\n", i);
+	else
+		pr_info("%d stale EC events cleared\n", i);
+}
+
 static void acpi_ec_enable_event(struct acpi_ec *ec)
 {
 	unsigned long flags;
@@ -507,6 +518,10 @@
 	if (acpi_ec_started(ec))
 		__acpi_ec_enable_event(ec);
 	spin_unlock_irqrestore(&ec->lock, flags);
+
+	/* Drain additional events if hardware requires that */
+	if (EC_FLAGS_CLEAR_ON_RESUME)
+		acpi_ec_clear(ec);
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -1034,12 +1049,6 @@
 		acpi_ec_start(first_ec, true);
 }
 
-void acpi_ec_dispatch_gpe(void)
-{
-	if (first_ec)
-		acpi_dispatch_gpe(NULL, first_ec->gpe);
-}
-
 /* --------------------------------------------------------------------------
                                 Event Management
    -------------------------------------------------------------------------- */
@@ -1527,49 +1536,6 @@
 	return ret;
 }
 
-static int acpi_config_boot_ec(struct acpi_ec *ec, acpi_handle handle,
-			       bool handle_events, bool is_ecdt)
-{
-	int ret;
-
-	/*
-	 * Changing the ACPI handle results in a re-configuration of the
-	 * boot EC. And if it happens after the namespace initialization,
-	 * it causes _REG evaluations.
-	 */
-	if (boot_ec && boot_ec->handle != handle)
-		ec_remove_handlers(boot_ec);
-
-	/* Unset old boot EC */
-	if (boot_ec != ec)
-		acpi_ec_free(boot_ec);
-
-	/*
-	 * ECDT device creation is split into acpi_ec_ecdt_probe() and
-	 * acpi_ec_ecdt_start(). This function takes care of completing the
-	 * ECDT parsing logic as the handle update should be performed
-	 * between the installation/uninstallation of the handlers.
-	 */
-	if (ec->handle != handle)
-		ec->handle = handle;
-
-	ret = acpi_ec_setup(ec, handle_events);
-	if (ret)
-		return ret;
-
-	/* Set new boot EC */
-	if (!boot_ec) {
-		boot_ec = ec;
-		boot_ec_is_ecdt = is_ecdt;
-	}
-
-	acpi_handle_info(boot_ec->handle,
-			 "Used as boot %s EC to handle transactions%s\n",
-			 is_ecdt ? "ECDT" : "DSDT",
-			 handle_events ? " and events" : "");
-	return ret;
-}
-
 static bool acpi_ec_ecdt_get_handle(acpi_handle *phandle)
 {
 	struct acpi_table_ecdt *ecdt_ptr;
@@ -1589,43 +1555,34 @@
 	return true;
 }
 
-static bool acpi_is_boot_ec(struct acpi_ec *ec)
-{
-	if (!boot_ec)
-		return false;
-	if (ec->command_addr == boot_ec->command_addr &&
-	    ec->data_addr == boot_ec->data_addr)
-		return true;
-	return false;
-}
-
 static int acpi_ec_add(struct acpi_device *device)
 {
 	struct acpi_ec *ec = NULL;
-	int ret;
-	bool is_ecdt = false;
+	bool dep_update = true;
 	acpi_status status;
+	int ret;
 
 	strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
 	strcpy(acpi_device_class(device), ACPI_EC_CLASS);
 
 	if (!strcmp(acpi_device_hid(device), ACPI_ECDT_HID)) {
-		is_ecdt = true;
+		boot_ec_is_ecdt = true;
 		ec = boot_ec;
+		dep_update = false;
 	} else {
 		ec = acpi_ec_alloc();
 		if (!ec)
 			return -ENOMEM;
+
 		status = ec_parse_device(device->handle, 0, ec, NULL);
 		if (status != AE_CTRL_TERMINATE) {
 			ret = -EINVAL;
 			goto err_alloc;
 		}
-	}
 
-	if (acpi_is_boot_ec(ec)) {
-		boot_ec_is_ecdt = is_ecdt;
-		if (!is_ecdt) {
+		if (boot_ec && ec->command_addr == boot_ec->command_addr &&
+		    ec->data_addr == boot_ec->data_addr) {
+			boot_ec_is_ecdt = false;
 			/*
 			 * Trust PNP0C09 namespace location rather than
 			 * ECDT ID. But trust ECDT GPE rather than _GPE
@@ -1637,12 +1594,17 @@
 			acpi_ec_free(ec);
 			ec = boot_ec;
 		}
-		ret = acpi_config_boot_ec(ec, ec->handle, true, is_ecdt);
-	} else
-		ret = acpi_ec_setup(ec, true);
+	}
+
+	ret = acpi_ec_setup(ec, true);
 	if (ret)
 		goto err_query;
 
+	if (ec == boot_ec)
+		acpi_handle_info(boot_ec->handle,
+				 "Boot %s EC used to handle transactions and events\n",
+				 boot_ec_is_ecdt ? "ECDT" : "DSDT");
+
 	device->driver_data = ec;
 
 	ret = !!request_region(ec->data_addr, 1, "EC data");
@@ -1650,7 +1612,7 @@
 	ret = !!request_region(ec->command_addr, 1, "EC cmd");
 	WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr);
 
-	if (!is_ecdt) {
+	if (dep_update) {
 		/* Reprobe devices depending on the EC */
 		acpi_walk_dep_device_list(ec->handle);
 	}
@@ -1718,10 +1680,10 @@
  * namespace EC before the main ACPI device enumeration process. It is
  * retained for historical reason and will be deprecated in the future.
  */
-int __init acpi_ec_dsdt_probe(void)
+void __init acpi_ec_dsdt_probe(void)
 {
-	acpi_status status;
 	struct acpi_ec *ec;
+	acpi_status status;
 	int ret;
 
 	/*
@@ -1731,21 +1693,22 @@
 	 * picking up an invalid EC device.
 	 */
 	if (boot_ec)
-		return -ENODEV;
+		return;
 
 	ec = acpi_ec_alloc();
 	if (!ec)
-		return -ENOMEM;
+		return;
+
 	/*
 	 * At this point, the namespace is initialized, so start to find
 	 * the namespace objects.
 	 */
-	status = acpi_get_devices(ec_device_ids[0].id,
-				  ec_parse_device, ec, NULL);
+	status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, ec, NULL);
 	if (ACPI_FAILURE(status) || !ec->handle) {
-		ret = -ENODEV;
-		goto error;
+		acpi_ec_free(ec);
+		return;
 	}
+
 	/*
 	 * When the DSDT EC is available, always re-configure boot EC to
 	 * have _REG evaluated. _REG can only be evaluated after the
@@ -1753,11 +1716,16 @@
 	 * At this point, the GPE is not fully initialized, so do not to
 	 * handle the events.
 	 */
-	ret = acpi_config_boot_ec(ec, ec->handle, false, false);
-error:
-	if (ret)
+	ret = acpi_ec_setup(ec, false);
+	if (ret) {
 		acpi_ec_free(ec);
-	return ret;
+		return;
+	}
+
+	boot_ec = ec;
+
+	acpi_handle_info(ec->handle,
+			 "Boot DSDT EC used to handle transactions\n");
 }
 
 /*
@@ -1809,6 +1777,31 @@
 #endif
 
 /*
+ * On some hardware it is necessary to clear events accumulated by the EC during
+ * sleep. These ECs stop reporting GPEs until they are manually polled, if too
+ * many events are accumulated. (e.g. Samsung Series 5/9 notebooks)
+ *
+ * https://bugzilla.kernel.org/show_bug.cgi?id=44161
+ *
+ * Ideally, the EC should also be instructed NOT to accumulate events during
+ * sleep (which Windows seems to do somehow), but the interface to control this
+ * behaviour is not known at this time.
+ *
+ * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx,
+ * however it is very likely that other Samsung models are affected.
+ *
+ * On systems which don't accumulate _Q events during sleep, this extra check
+ * should be harmless.
+ */
+static int ec_clear_on_resume(const struct dmi_system_id *id)
+{
+	pr_debug("Detected system needing EC poll on resume.\n");
+	EC_FLAGS_CLEAR_ON_RESUME = 1;
+	ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS;
+	return 0;
+}
+
+/*
  * Some ECDTs contain wrong register addresses.
  * MSI MS-171F
  * https://bugzilla.kernel.org/show_bug.cgi?id=12461
@@ -1857,39 +1850,38 @@
 	ec_honor_ecdt_gpe, "ASUS X580VD", {
 	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 	DMI_MATCH(DMI_PRODUCT_NAME, "X580VD"),}, NULL},
+	{
+	ec_clear_on_resume, "Samsung hardware", {
+	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL},
 	{},
 };
 
-int __init acpi_ec_ecdt_probe(void)
+void __init acpi_ec_ecdt_probe(void)
 {
-	int ret;
-	acpi_status status;
 	struct acpi_table_ecdt *ecdt_ptr;
 	struct acpi_ec *ec;
+	acpi_status status;
+	int ret;
 
-	ec = acpi_ec_alloc();
-	if (!ec)
-		return -ENOMEM;
-	/*
-	 * Generate a boot ec context
-	 */
+	/* Generate a boot ec context. */
 	dmi_check_system(ec_dmi_table);
 	status = acpi_get_table(ACPI_SIG_ECDT, 1,
 				(struct acpi_table_header **)&ecdt_ptr);
-	if (ACPI_FAILURE(status)) {
-		ret = -ENODEV;
-		goto error;
-	}
+	if (ACPI_FAILURE(status))
+		return;
 
 	if (!ecdt_ptr->control.address || !ecdt_ptr->data.address) {
 		/*
 		 * Asus X50GL:
 		 * https://bugzilla.kernel.org/show_bug.cgi?id=11880
 		 */
-		ret = -ENODEV;
-		goto error;
+		return;
 	}
 
+	ec = acpi_ec_alloc();
+	if (!ec)
+		return;
+
 	if (EC_FLAGS_CORRECT_ECDT) {
 		ec->command_addr = ecdt_ptr->data.address;
 		ec->data_addr = ecdt_ptr->control.address;
@@ -1898,16 +1890,22 @@
 		ec->data_addr = ecdt_ptr->data.address;
 	}
 	ec->gpe = ecdt_ptr->gpe;
+	ec->handle = ACPI_ROOT_OBJECT;
 
 	/*
 	 * At this point, the namespace is not initialized, so do not find
 	 * the namespace objects, or handle the events.
 	 */
-	ret = acpi_config_boot_ec(ec, ACPI_ROOT_OBJECT, false, true);
-error:
-	if (ret)
+	ret = acpi_ec_setup(ec, false);
+	if (ret) {
 		acpi_ec_free(ec);
-	return ret;
+		return;
+	}
+
+	boot_ec = ec;
+	boot_ec_is_ecdt = true;
+
+	pr_info("Boot ECDT EC used to handle transactions\n");
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -1916,7 +1914,7 @@
 	struct acpi_ec *ec =
 		acpi_driver_data(to_acpi_device(dev));
 
-	if (acpi_sleep_no_ec_events() && ec_freeze_events)
+	if (!pm_suspend_no_platform() && ec_freeze_events)
 		acpi_ec_disable_event(ec);
 	return 0;
 }
@@ -1933,8 +1931,7 @@
 	    ec->reference_count >= 1)
 		acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);
 
-	if (acpi_sleep_no_ec_events())
-		acpi_ec_enter_noirq(ec);
+	acpi_ec_enter_noirq(ec);
 
 	return 0;
 }
@@ -1943,8 +1940,7 @@
 {
 	struct acpi_ec *ec = acpi_driver_data(to_acpi_device(dev));
 
-	if (acpi_sleep_no_ec_events())
-		acpi_ec_leave_noirq(ec);
+	acpi_ec_leave_noirq(ec);
 
 	if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) &&
 	    ec->reference_count >= 1)
@@ -1961,7 +1957,35 @@
 	acpi_ec_enable_event(ec);
 	return 0;
 }
-#endif
+
+void acpi_ec_mark_gpe_for_wake(void)
+{
+	if (first_ec && !ec_no_wakeup)
+		acpi_mark_gpe_for_wake(NULL, first_ec->gpe);
+}
+EXPORT_SYMBOL_GPL(acpi_ec_mark_gpe_for_wake);
+
+void acpi_ec_set_gpe_wake_mask(u8 action)
+{
+	if (pm_suspend_no_platform() && first_ec && !ec_no_wakeup)
+		acpi_set_gpe_wake_mask(NULL, first_ec->gpe, action);
+}
+
+bool acpi_ec_dispatch_gpe(void)
+{
+	u32 ret;
+
+	if (!first_ec)
+		return false;
+
+	ret = acpi_dispatch_gpe(NULL, first_ec->gpe);
+	if (ret == ACPI_INTERRUPT_HANDLED) {
+		pm_pr_dbg("EC GPE dispatched\n");
+		return true;
+	}
+	return false;
+}
+#endif /* CONFIG_PM_SLEEP */
 
 static const struct dev_pm_ops acpi_ec_pm = {
 	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend_noirq, acpi_ec_resume_noirq)