#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 */
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;
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));
+}
- 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 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);
+}
+
+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,
{
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) {
"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
{
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,
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;
}
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");
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;
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;
/* EC is fully operational, allow queries */
clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
+ ec_schedule_ec_poll(ec);
return ret;
}
return -EFAULT;
}
+static const struct acpi_device_id ec_device_ids[] = {
+ {"PNP0C09", 0},
+ {"", 0},
+};
+
int __init acpi_ec_ecdt_probe(void)
{
int ret;
boot_ec->data_addr = ecdt_ptr->data.address;
boot_ec->gpe = ecdt_ptr->gpe;
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 */
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;
projects / mv-sheeva.git / blobdiff