diff options
Diffstat (limited to 'drivers/acpi/ec.c')
-rw-r--r-- | drivers/acpi/ec.c | 246 |
1 files changed, 125 insertions, 121 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index caf873c14bfb..3d9362140831 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -73,38 +73,14 @@ enum ec_event { #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ +#define ACPI_EC_UDELAY 100 /* Wait 100us before polling EC again */ enum { EC_FLAGS_WAIT_GPE = 0, /* Don't check status until GPE arrives */ EC_FLAGS_QUERY_PENDING, /* Query is pending */ EC_FLAGS_GPE_MODE, /* Expect GPE to be sent for status change */ - EC_FLAGS_NO_ADDRESS_GPE, /* Expect GPE only for non-address event */ - EC_FLAGS_ADDRESS, /* Address is being written */ - EC_FLAGS_NO_WDATA_GPE, /* Don't expect WDATA GPE event */ - EC_FLAGS_WDATA, /* Data is being written */ - EC_FLAGS_NO_OBF1_GPE, /* Don't expect GPE before read */ -}; - -static int acpi_ec_remove(struct acpi_device *device, int type); -static int acpi_ec_start(struct acpi_device *device); -static int acpi_ec_stop(struct acpi_device *device, int type); -static int acpi_ec_add(struct acpi_device *device); - -static const struct acpi_device_id ec_device_ids[] = { - {"PNP0C09", 0}, - {"", 0}, -}; - -static struct acpi_driver acpi_ec_driver = { - .name = "ec", - .class = ACPI_EC_CLASS, - .ids = ec_device_ids, - .ops = { - .add = acpi_ec_add, - .remove = acpi_ec_remove, - .start = acpi_ec_start, - .stop = acpi_ec_stop, - }, + EC_FLAGS_NO_GPE, /* Don't use GPE mode */ + EC_FLAGS_RESCHEDULE_POLL /* Re-schedule poll */ }; /* If we find an EC via the ECDT, we need to keep a ptr to its context */ @@ -129,6 +105,8 @@ static struct acpi_ec { struct mutex lock; wait_queue_head_t wait; struct list_head list; + struct delayed_work work; + atomic_t irq_count; u8 handlers_installed; } *boot_ec, *first_ec; @@ -177,65 +155,52 @@ static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event) return 0; } -static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll) +static void ec_schedule_ec_poll(struct acpi_ec *ec) { - int ret = 0; + if (test_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags)) + schedule_delayed_work(&ec->work, + msecs_to_jiffies(ACPI_EC_DELAY)); +} + +static void ec_switch_to_poll_mode(struct acpi_ec *ec) +{ + set_bit(EC_FLAGS_NO_GPE, &ec->flags); + clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); + acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); + set_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags); +} - if (unlikely(event == ACPI_EC_EVENT_OBF_1 && - test_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags))) - force_poll = 1; - if (unlikely(test_bit(EC_FLAGS_ADDRESS, &ec->flags) && - test_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags))) - force_poll = 1; - if (unlikely(test_bit(EC_FLAGS_WDATA, &ec->flags) && - test_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags))) - force_poll = 1; +static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll) +{ + atomic_set(&ec->irq_count, 0); if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) && likely(!force_poll)) { if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event), msecs_to_jiffies(ACPI_EC_DELAY))) - goto end; + return 0; clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); if (acpi_ec_check_status(ec, event)) { - if (event == ACPI_EC_EVENT_OBF_1) { - /* miss OBF_1 GPE, don't expect it */ - pr_info(PREFIX "missing OBF confirmation, " - "don't expect it any longer.\n"); - set_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags); - } else if (test_bit(EC_FLAGS_ADDRESS, &ec->flags)) { - /* miss address GPE, don't expect it anymore */ - pr_info(PREFIX "missing address confirmation, " - "don't expect it any longer.\n"); - set_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags); - } else if (test_bit(EC_FLAGS_WDATA, &ec->flags)) { - /* miss write data GPE, don't expect it */ - pr_info(PREFIX "missing write data confirmation, " - "don't expect it any longer.\n"); - set_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags); - } else { - /* missing GPEs, switch back to poll mode */ - if (printk_ratelimit()) - pr_info(PREFIX "missing confirmations, " + /* missing GPEs, switch back to poll mode */ + if (printk_ratelimit()) + pr_info(PREFIX "missing confirmations, " "switch off interrupt mode.\n"); - clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); - } - goto end; + ec_switch_to_poll_mode(ec); + ec_schedule_ec_poll(ec); + return 0; } } else { unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); while (time_before(jiffies, delay)) { if (acpi_ec_check_status(ec, event)) - goto end; + return 0; + udelay(ACPI_EC_UDELAY); } } - pr_err(PREFIX "acpi_ec_wait timeout," - " status = %d, expect_event = %d\n", - acpi_ec_read_status(ec), event); - ret = -ETIME; - end: - clear_bit(EC_FLAGS_ADDRESS, &ec->flags); - return ret; + pr_err(PREFIX "acpi_ec_wait timeout, status = 0x%2.2x, event = %s\n", + acpi_ec_read_status(ec), + (event == ACPI_EC_EVENT_OBF_1) ? "\"b0=1\"" : "\"b1=0\""); + return -ETIME; } static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, @@ -245,8 +210,8 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, { int result = 0; set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); - acpi_ec_write_cmd(ec, command); pr_debug(PREFIX "transaction start\n"); + acpi_ec_write_cmd(ec, command); for (; wdata_len > 0; --wdata_len) { result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll); if (result) { @@ -254,15 +219,11 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, "write_cmd timeout, command = %d\n", command); goto end; } - /* mark the address byte written to EC */ - if (rdata_len + wdata_len > 1) - set_bit(EC_FLAGS_ADDRESS, &ec->flags); set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); acpi_ec_write_data(ec, *(wdata++)); } if (!rdata_len) { - set_bit(EC_FLAGS_WDATA, &ec->flags); result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll); if (result) { pr_err(PREFIX @@ -527,47 +488,51 @@ static u32 acpi_ec_gpe_handler(void *data) { acpi_status status = AE_OK; struct acpi_ec *ec = data; + u8 state = acpi_ec_read_status(ec); pr_debug(PREFIX "~~~> interrupt\n"); + atomic_inc(&ec->irq_count); + if (atomic_read(&ec->irq_count) > 5) { + pr_err(PREFIX "GPE storm detected, disabling EC GPE\n"); + ec_switch_to_poll_mode(ec); + goto end; + } clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) wake_up(&ec->wait); - if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) { + if (state & ACPI_EC_FLAG_SCI) { if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) status = acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, ec); - } else if (unlikely(!test_bit(EC_FLAGS_GPE_MODE, &ec->flags))) { + } else if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && + !test_bit(EC_FLAGS_NO_GPE, &ec->flags) && + in_interrupt()) { /* this is non-query, must be confirmation */ if (printk_ratelimit()) pr_info(PREFIX "non-query interrupt received," " switching to interrupt mode\n"); set_bit(EC_FLAGS_GPE_MODE, &ec->flags); + clear_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags); } - +end: + ec_schedule_ec_poll(ec); return ACPI_SUCCESS(status) ? ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; } +static void do_ec_poll(struct work_struct *work) +{ + struct acpi_ec *ec = container_of(work, struct acpi_ec, work.work); + atomic_set(&ec->irq_count, 0); + (void)acpi_ec_gpe_handler(ec); +} + /* -------------------------------------------------------------------------- Address Space Management -------------------------------------------------------------------------- */ static acpi_status -acpi_ec_space_setup(acpi_handle region_handle, - u32 function, void *handler_context, void **return_context) -{ - /* - * The EC object is in the handler context and is needed - * when calling the acpi_ec_space_handler. - */ - *return_context = (function != ACPI_REGION_DEACTIVATE) ? - handler_context : NULL; - - return AE_OK; -} - -static acpi_status acpi_ec_space_handler(u32 function, acpi_physical_address address, u32 bits, acpi_integer *value, void *handler_context, void *region_context) @@ -709,6 +674,8 @@ static struct acpi_ec *make_acpi_ec(void) mutex_init(&ec->lock); init_waitqueue_head(&ec->wait); INIT_LIST_HEAD(&ec->list); + INIT_DELAYED_WORK_DEFERRABLE(&ec->work, do_ec_poll); + atomic_set(&ec->irq_count, 0); return ec; } @@ -741,17 +708,21 @@ ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe); if (ACPI_FAILURE(status)) return status; - /* Find and register all query methods */ - acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1, - acpi_ec_register_query_methods, ec, NULL); /* Use the global lock for all EC transactions? */ acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock); ec->handle = handle; return AE_CTRL_TERMINATE; } +static void ec_poll_stop(struct acpi_ec *ec) +{ + clear_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags); + cancel_delayed_work(&ec->work); +} + static void ec_remove_handlers(struct acpi_ec *ec) { + ec_poll_stop(ec); if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) pr_err(PREFIX "failed to remove space handler\n"); @@ -771,31 +742,28 @@ static int acpi_ec_add(struct acpi_device *device) strcpy(acpi_device_class(device), ACPI_EC_CLASS); /* Check for boot EC */ - if (boot_ec) { - if (boot_ec->handle == device->handle) { - /* Pre-loaded EC from DSDT, just move pointer */ - ec = boot_ec; - boot_ec = NULL; - goto end; - } else if (boot_ec->handle == ACPI_ROOT_OBJECT) { - /* ECDT-based EC, time to shut it down */ - ec_remove_handlers(boot_ec); - kfree(boot_ec); - first_ec = boot_ec = NULL; + if (boot_ec && + (boot_ec->handle == device->handle || + boot_ec->handle == ACPI_ROOT_OBJECT)) { + ec = boot_ec; + boot_ec = NULL; + } else { + ec = make_acpi_ec(); + if (!ec) + return -ENOMEM; + if (ec_parse_device(device->handle, 0, ec, NULL) != + AE_CTRL_TERMINATE) { + kfree(ec); + return -EINVAL; } } - ec = make_acpi_ec(); - if (!ec) - return -ENOMEM; - - if (ec_parse_device(device->handle, 0, ec, NULL) != - AE_CTRL_TERMINATE) { - kfree(ec); - return -EINVAL; - } ec->handle = device->handle; - end: + + /* Find and register all query methods */ + acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, + acpi_ec_register_query_methods, ec, NULL); + if (!first_ec) first_ec = ec; acpi_driver_data(device) = ec; @@ -870,7 +838,7 @@ static int ec_install_handlers(struct acpi_ec *ec) status = acpi_install_address_space_handler(ec->handle, ACPI_ADR_SPACE_EC, &acpi_ec_space_handler, - &acpi_ec_space_setup, ec); + NULL, ec); if (ACPI_FAILURE(status)) { acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); return -ENODEV; @@ -897,6 +865,7 @@ static int acpi_ec_start(struct acpi_device *device) /* EC is fully operational, allow queries */ clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); + ec_schedule_ec_poll(ec); return ret; } @@ -924,6 +893,11 @@ int __init acpi_boot_ec_enable(void) return -EFAULT; } +static const struct acpi_device_id ec_device_ids[] = { + {"PNP0C09", 0}, + {"", 0}, +}; + int __init acpi_ec_ecdt_probe(void) { int ret; @@ -943,11 +917,8 @@ int __init acpi_ec_ecdt_probe(void) boot_ec->command_addr = ecdt_ptr->control.address; boot_ec->data_addr = ecdt_ptr->data.address; boot_ec->gpe = ecdt_ptr->gpe; - if (ACPI_FAILURE(acpi_get_handle(NULL, ecdt_ptr->id, - &boot_ec->handle))) { - pr_info("Failed to locate handle for boot EC\n"); - boot_ec->handle = ACPI_ROOT_OBJECT; - } + boot_ec->handle = ACPI_ROOT_OBJECT; + acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); } else { /* This workaround is needed only on some broken machines, * which require early EC, but fail to provide ECDT */ @@ -977,6 +948,39 @@ int __init acpi_ec_ecdt_probe(void) return -ENODEV; } +static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) +{ + struct acpi_ec *ec = acpi_driver_data(device); + /* Stop using GPE */ + set_bit(EC_FLAGS_NO_GPE, &ec->flags); + clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); + acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); + return 0; +} + +static int acpi_ec_resume(struct acpi_device *device) +{ + struct acpi_ec *ec = acpi_driver_data(device); + /* Enable use of GPE back */ + clear_bit(EC_FLAGS_NO_GPE, &ec->flags); + acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); + return 0; +} + +static struct acpi_driver acpi_ec_driver = { + .name = "ec", + .class = ACPI_EC_CLASS, + .ids = ec_device_ids, + .ops = { + .add = acpi_ec_add, + .remove = acpi_ec_remove, + .start = acpi_ec_start, + .stop = acpi_ec_stop, + .suspend = acpi_ec_suspend, + .resume = acpi_ec_resume, + }, +}; + static int __init acpi_ec_init(void) { int result = 0; |