diff options
Diffstat (limited to 'drivers/acpi/ec.c')
-rw-r--r-- | drivers/acpi/ec.c | 162 |
1 files changed, 103 insertions, 59 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 73c76d646064..e7bd57cc550a 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -101,6 +101,7 @@ enum ec_command { #define ACPI_EC_UDELAY_POLL 550 /* Wait 1ms for EC transaction polling */ #define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query * when trying to clear the EC */ +#define ACPI_EC_MAX_QUERIES 16 /* Maximum number of parallel queries */ enum { EC_FLAGS_QUERY_PENDING, /* Query is pending */ @@ -121,6 +122,10 @@ static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; module_param(ec_delay, uint, 0644); MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); +static unsigned int ec_max_queries __read_mostly = ACPI_EC_MAX_QUERIES; +module_param(ec_max_queries, uint, 0644); +MODULE_PARM_DESC(ec_max_queries, "Maximum parallel _Qxx evaluations"); + static bool ec_busy_polling __read_mostly; module_param(ec_busy_polling, bool, 0644); MODULE_PARM_DESC(ec_busy_polling, "Use busy polling to advance EC transaction"); @@ -174,6 +179,7 @@ static void acpi_ec_event_processor(struct work_struct *work); struct acpi_ec *boot_ec, *first_ec; EXPORT_SYMBOL(first_ec); +static struct workqueue_struct *ec_query_wq; static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */ @@ -1098,7 +1104,7 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 *data) * work queue execution. */ ec_dbg_evt("Query(0x%02x) scheduled", value); - if (!schedule_work(&q->work)) { + if (!queue_work(ec_query_wq, &q->work)) { ec_dbg_evt("Query(0x%02x) overlapped", value); result = -EBUSY; } @@ -1331,8 +1337,6 @@ static int ec_install_handlers(struct acpi_ec *ec) static void ec_remove_handlers(struct acpi_ec *ec) { - acpi_ec_stop(ec, false); - if (test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) @@ -1340,6 +1344,19 @@ static void ec_remove_handlers(struct acpi_ec *ec) clear_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); } + /* + * Stops handling the EC transactions after removing the operation + * region handler. This is required because _REG(DISCONNECT) + * invoked during the removal can result in new EC transactions. + * + * Flushes the EC requests and thus disables the GPE before + * removing the GPE handler. This is required by the current ACPICA + * GPE core. ACPICA GPE core will automatically disable a GPE when + * it is indicated but there is no way to handle it. So the drivers + * must disable the GPEs prior to removing the GPE handlers. + */ + acpi_ec_stop(ec, false); + if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler))) @@ -1348,13 +1365,9 @@ static void ec_remove_handlers(struct acpi_ec *ec) } } -static int acpi_ec_add(struct acpi_device *device) +static struct acpi_ec *acpi_ec_alloc(void) { - struct acpi_ec *ec = NULL; - int ret; - - strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); - strcpy(acpi_device_class(device), ACPI_EC_CLASS); + struct acpi_ec *ec; /* Check for boot EC */ if (boot_ec) { @@ -1365,9 +1378,21 @@ static int acpi_ec_add(struct acpi_device *device) first_ec = NULL; } else { ec = make_acpi_ec(); - if (!ec) - return -ENOMEM; } + return ec; +} + +static int acpi_ec_add(struct acpi_device *device) +{ + struct acpi_ec *ec = NULL; + int ret; + + 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) { kfree(ec); @@ -1454,27 +1479,31 @@ static const struct acpi_device_id ec_device_ids[] = { int __init acpi_ec_dsdt_probe(void) { acpi_status status; + struct acpi_ec *ec; + int ret; - if (boot_ec) - return 0; - + ec = acpi_ec_alloc(); + if (!ec) + return -ENOMEM; /* * Finding EC from DSDT if there is no ECDT EC available. When this * function is invoked, ACPI tables have been fully loaded, we can * walk namespace now. */ - boot_ec = make_acpi_ec(); - if (!boot_ec) - return -ENOMEM; status = acpi_get_devices(ec_device_ids[0].id, - ec_parse_device, boot_ec, NULL); - if (ACPI_FAILURE(status) || !boot_ec->handle) - return -ENODEV; - if (!ec_install_handlers(boot_ec)) { - first_ec = boot_ec; - return 0; + ec_parse_device, ec, NULL); + if (ACPI_FAILURE(status) || !ec->handle) { + ret = -ENODEV; + goto error; } - return -EFAULT; + ret = ec_install_handlers(ec); + +error: + if (ret) + kfree(ec); + else + first_ec = boot_ec = ec; + return ret; } #if 0 @@ -1518,6 +1547,11 @@ static int ec_clear_on_resume(const struct dmi_system_id *id) return 0; } +/* + * Some ECDTs contain wrong register addresses. + * MSI MS-171F + * https://bugzilla.kernel.org/show_bug.cgi?id=12461 + */ static int ec_correct_ecdt(const struct dmi_system_id *id) { pr_debug("Detected system needing ECDT address correction.\n"); @@ -1527,16 +1561,6 @@ static int ec_correct_ecdt(const struct dmi_system_id *id) static struct dmi_system_id ec_dmi_table[] __initdata = { { - ec_correct_ecdt, "Asus L4R", { - DMI_MATCH(DMI_BIOS_VERSION, "1008.006"), - DMI_MATCH(DMI_PRODUCT_NAME, "L4R"), - DMI_MATCH(DMI_BOARD_NAME, "L4R") }, NULL}, - { - ec_correct_ecdt, "Asus M6R", { - DMI_MATCH(DMI_BIOS_VERSION, "0207"), - DMI_MATCH(DMI_PRODUCT_NAME, "M6R"), - DMI_MATCH(DMI_BOARD_NAME, "M6R") }, NULL}, - { ec_correct_ecdt, "MSI MS-171F", { DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star"), DMI_MATCH(DMI_PRODUCT_NAME, "MS-171F"),}, NULL}, @@ -1548,12 +1572,13 @@ static struct dmi_system_id ec_dmi_table[] __initdata = { int __init acpi_ec_ecdt_probe(void) { - int ret = 0; + int ret; acpi_status status; struct acpi_table_ecdt *ecdt_ptr; + struct acpi_ec *ec; - boot_ec = make_acpi_ec(); - if (!boot_ec) + ec = acpi_ec_alloc(); + if (!ec) return -ENOMEM; /* * Generate a boot ec context @@ -1577,28 +1602,20 @@ int __init acpi_ec_ecdt_probe(void) pr_info("EC description table is found, configuring boot EC\n"); if (EC_FLAGS_CORRECT_ECDT) { - /* - * Asus L4R, Asus M6R - * https://bugzilla.kernel.org/show_bug.cgi?id=9399 - * MSI MS-171F - * https://bugzilla.kernel.org/show_bug.cgi?id=12461 - */ - boot_ec->command_addr = ecdt_ptr->data.address; - boot_ec->data_addr = ecdt_ptr->control.address; + ec->command_addr = ecdt_ptr->data.address; + ec->data_addr = ecdt_ptr->control.address; } else { - boot_ec->command_addr = ecdt_ptr->control.address; - boot_ec->data_addr = ecdt_ptr->data.address; + ec->command_addr = ecdt_ptr->control.address; + ec->data_addr = ecdt_ptr->data.address; } - boot_ec->gpe = ecdt_ptr->gpe; - boot_ec->handle = ACPI_ROOT_OBJECT; - ret = ec_install_handlers(boot_ec); - if (!ret) - first_ec = boot_ec; + ec->gpe = ecdt_ptr->gpe; + ec->handle = ACPI_ROOT_OBJECT; + ret = ec_install_handlers(ec); error: - if (ret) { - kfree(boot_ec); - boot_ec = NULL; - } + if (ret) + kfree(ec); + else + first_ec = boot_ec = ec; return ret; } @@ -1649,15 +1666,41 @@ static struct acpi_driver acpi_ec_driver = { }, }; +static inline int acpi_ec_query_init(void) +{ + if (!ec_query_wq) { + ec_query_wq = alloc_workqueue("kec_query", 0, + ec_max_queries); + if (!ec_query_wq) + return -ENODEV; + } + return 0; +} + +static inline void acpi_ec_query_exit(void) +{ + if (ec_query_wq) { + destroy_workqueue(ec_query_wq); + ec_query_wq = NULL; + } +} + int __init acpi_ec_init(void) { - int result = 0; + int result; + /* register workqueue for _Qxx evaluations */ + result = acpi_ec_query_init(); + if (result) + goto err_exit; /* Now register the driver for the EC */ result = acpi_bus_register_driver(&acpi_ec_driver); - if (result < 0) - return -ENODEV; + if (result) + goto err_exit; +err_exit: + if (result) + acpi_ec_query_exit(); return result; } @@ -1667,5 +1710,6 @@ static void __exit acpi_ec_exit(void) { acpi_bus_unregister_driver(&acpi_ec_driver); + acpi_ec_query_exit(); } #endif /* 0 */ |