The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From a64a62ce9a380213dc9e192f762266d70c9b40ec Mon Sep 17 00:00:00 2001

From: Lv Zheng lv.zheng@intel.com Date: Tue, 26 Sep 2017 16:54:09 +0800 Subject: [PATCH] ACPI / EC: Fix regression related to PM ops support in ECDT device

On platforms (ASUS X550ZE and possibly all ASUS X series) with valid ECDT EC but invalid DSDT EC, EC PM ops won't be invoked as ECDT EC is not an ACPI device. Thus the following commit actually removed post-resume acpi_ec_enable_event() invocation for such platforms, and triggered a regression on them that after being resumed, EC (actually should be ECDT) driver stops handling EC events:

Commit: c2b46d679b30c5c0d7eb47a21085943242bdd8dc Subject: ACPI / EC: Add PM operations to improve event handling for resume process

Notice that the root cause actually is "ECDT is not an ACPI device" rather than "the timing of acpi_ec_enable_event() invocation", this patch fixes this issue by enumerating ECDT EC as an ACPI device. Due to the existence of the noirq stage, the ability of tuning the timing of acpi_ec_enable_event() invocation is still meaningful.

This patch is a little bit different from the posted fix by moving acpi_config_boot_ec() from acpi_ec_ecdt_start() to acpi_ec_add() to make sure that EC event handling won't be stopped as long as the ACPI EC driver is bound. Thus the following sequence shouldn't disable EC event handling: unbind,suspend,resume,bind.

Fixes: c2b46d679b30 (ACPI / EC: Add PM operations to improve event handling for resume process) Link: https://bugzilla.kernel.org/show_bug.cgi?id=196847 Reported-by: Luya Tshimbalanga luya@fedoraproject.org Tested-by: Luya Tshimbalanga luya@fedoraproject.org Cc: 4.9+ stable@vger.kernel.org # 4.9+ Signed-off-by: Lv Zheng lv.zheng@intel.com Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 82b3ce5e937e..df842465634a 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -1597,32 +1597,41 @@ static int acpi_ec_add(struct acpi_device *device) { struct acpi_ec *ec = NULL; int ret; + bool is_ecdt = false; + acpi_status status;

strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); strcpy(acpi_device_class(device), ACPI_EC_CLASS);

- ec = acpi_ec_alloc(); - if (!ec) - return -ENOMEM; - if (ec_parse_device(device->handle, 0, ec, NULL) != - AE_CTRL_TERMINATE) { + if (!strcmp(acpi_device_hid(device), ACPI_ECDT_HID)) { + is_ecdt = true; + ec = boot_ec; + } 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 = false; - /* - * Trust PNP0C09 namespace location rather than ECDT ID. - * - * But trust ECDT GPE rather than _GPE because of ASUS quirks, - * so do not change boot_ec->gpe to ec->gpe. - */ - boot_ec->handle = ec->handle; - acpi_handle_debug(ec->handle, "duplicated.\n"); - acpi_ec_free(ec); - ec = boot_ec; - ret = acpi_config_boot_ec(ec, ec->handle, true, false); + boot_ec_is_ecdt = is_ecdt; + if (!is_ecdt) { + /* + * Trust PNP0C09 namespace location rather than + * ECDT ID. But trust ECDT GPE rather than _GPE + * because of ASUS quirks, so do not change + * boot_ec->gpe to ec->gpe. + */ + boot_ec->handle = ec->handle; + acpi_handle_debug(ec->handle, "duplicated.\n"); + 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); if (ret) @@ -1635,8 +1644,10 @@ static int acpi_ec_add(struct acpi_device *device) ret = !!request_region(ec->command_addr, 1, "EC cmd"); WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr);

- /* Reprobe devices depending on the EC */ - acpi_walk_dep_device_list(ec->handle); + if (!is_ecdt) { + /* Reprobe devices depending on the EC */ + acpi_walk_dep_device_list(ec->handle); + } acpi_handle_debug(ec->handle, "enumerated.\n"); return 0;

@@ -1692,6 +1703,7 @@ ec_parse_io_ports(struct acpi_resource *resource, void *context)

static const struct acpi_device_id ec_device_ids[] = { {"PNP0C09", 0}, + {ACPI_ECDT_HID, 0}, {"", 0}, };

@@ -1764,11 +1776,14 @@ static int __init acpi_ec_ecdt_start(void) * Note: ec->handle can be valid if this function is called after * acpi_ec_add(), hence the fast path. */ - if (boot_ec->handle != ACPI_ROOT_OBJECT) - handle = boot_ec->handle; - else if (!acpi_ec_ecdt_get_handle(&handle)) - return -ENODEV; - return acpi_config_boot_ec(boot_ec, handle, true, true); + if (boot_ec->handle == ACPI_ROOT_OBJECT) { + if (!acpi_ec_ecdt_get_handle(&handle)) + return -ENODEV; + boot_ec->handle = handle; + } + + /* Register to ACPI bus with PM ops attached */ + return acpi_bus_register_early_device(ACPI_BUS_TYPE_ECDT_EC); }

#if 0 @@ -2020,6 +2035,12 @@ int __init acpi_ec_init(void)

/* Drivers must be started after acpi_ec_query_init() */ dsdt_fail = acpi_bus_register_driver(&acpi_ec_driver); + /* + * Register ECDT to ACPI bus only when PNP0C09 probe fails. This is + * useful for platforms (confirmed on ASUS X550ZE) with valid ECDT + * settings but invalid DSDT settings. + * https://bugzilla.kernel.org/show_bug.cgi?id=196847 + */ ecdt_fail = acpi_ec_ecdt_start(); return ecdt_fail && dsdt_fail ? -ENODEV : 0; } diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index 4361c4415b4f..ede83d38beed 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -115,6 +115,7 @@ bool acpi_device_is_present(const struct acpi_device *adev); bool acpi_device_is_battery(struct acpi_device *adev); bool acpi_device_is_first_physical_node(struct acpi_device *adev, const struct device *dev); +int acpi_bus_register_early_device(int type);

/* -------------------------------------------------------------------------- Device Matching and Notification diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 602f8ff212f2..2f2f50322ffb 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1024,6 +1024,9 @@ static void acpi_device_get_busid(struct acpi_device *device) case ACPI_BUS_TYPE_SLEEP_BUTTON: strcpy(device->pnp.bus_id, "SLPF"); break; + case ACPI_BUS_TYPE_ECDT_EC: + strcpy(device->pnp.bus_id, "ECDT"); + break; default: acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); /* Clean up trailing underscores (if any) */ @@ -1304,6 +1307,9 @@ static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, case ACPI_BUS_TYPE_SLEEP_BUTTON: acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); break; + case ACPI_BUS_TYPE_ECDT_EC: + acpi_add_id(pnp, ACPI_ECDT_HID); + break; } }

@@ -2049,6 +2055,21 @@ void acpi_bus_trim(struct acpi_device *adev) } EXPORT_SYMBOL_GPL(acpi_bus_trim);

+int acpi_bus_register_early_device(int type) +{ + struct acpi_device *device = NULL; + int result; + + result = acpi_add_single_object(&device, NULL, + type, ACPI_STA_DEFAULT); + if (result) + return result; + + device->flags.match_driver = true; + return device_attach(&device->dev); +} +EXPORT_SYMBOL_GPL(acpi_bus_register_early_device); + static int acpi_bus_scan_fixed(void) { int result = 0; diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index fa1505292f6c..324a04df3785 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -105,6 +105,7 @@ enum acpi_bus_device_type { ACPI_BUS_TYPE_THERMAL, ACPI_BUS_TYPE_POWER_BUTTON, ACPI_BUS_TYPE_SLEEP_BUTTON, + ACPI_BUS_TYPE_ECDT_EC, ACPI_BUS_DEVICE_TYPE_COUNT };

diff --git a/include/acpi/acpi_drivers.h b/include/acpi/acpi_drivers.h index 29c691265b49..14499757338f 100644 --- a/include/acpi/acpi_drivers.h +++ b/include/acpi/acpi_drivers.h @@ -58,6 +58,7 @@ #define ACPI_VIDEO_HID "LNXVIDEO" #define ACPI_BAY_HID "LNXIOBAY" #define ACPI_DOCK_HID "LNXDOCK" +#define ACPI_ECDT_HID "LNXEC" /* Quirk for broken IBM BIOSes */ #define ACPI_SMBUS_IBM_HID "SMBUSIBM"