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Merge branch 'ec' into test

hifive-unleashed-5.1
Len Brown 2008-10-22 23:27:59 -04:00
parent 47bf31adc5 c0ff17720e
commit 0fbb3726f2
4 changed files with 204 additions and 193 deletions
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6
drivers/acpi/bus.c
View File

@ -793,6 +793,12 @@ static int __init acpi_bus_init(void)
goto error1;
}
/*
* Maybe EC region is required at bus_scan/acpi_get_devices. So it
* is necessary to enable it as early as possible.
*/
acpi_boot_ec_enable();
printk(KERN_INFO PREFIX "Interpreter enabled\n");
/* Initialize sleep structures */

386
drivers/acpi/ec.c
View File

@ -1,7 +1,7 @@
/*
* ec.c - ACPI Embedded Controller Driver (v2.0)
* ec.c - ACPI Embedded Controller Driver (v2.1)
*
* Copyright (C) 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
* Copyright (C) 2006-2008 Alexey Starikovskiy <astarikovskiy@suse.de>
* Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com>
* Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
@ -26,7 +26,7 @@
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
/* Uncomment next line to get verbose print outs*/
/* Uncomment next line to get verbose printout */
/* #define DEBUG */
#include <linux/kernel.h>
@ -38,6 +38,7 @@
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <asm/io.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
@ -65,22 +66,21 @@ enum ec_command {
ACPI_EC_COMMAND_QUERY = 0x84,
};
/* EC events */
enum ec_event {
ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */
ACPI_EC_EVENT_IBF_0, /* Input buffer empty */
};
#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 */
#define ACPI_EC_STORM_THRESHOLD 20 /* number of false interrupts
per one transaction */
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_GPE_MODE, /* Expect GPE to be sent
* for status change */
EC_FLAGS_NO_GPE, /* Don't use GPE mode */
EC_FLAGS_RESCHEDULE_POLL /* Re-schedule poll */
EC_FLAGS_GPE_STORM, /* GPE storm detected */
EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and
* OpReg are installed */
};
/* If we find an EC via the ECDT, we need to keep a ptr to its context */
@ -95,6 +95,15 @@ struct acpi_ec_query_handler {
u8 query_bit;
};
struct transaction {
const u8 *wdata;
u8 *rdata;
unsigned short irq_count;
u8 command;
u8 wlen;
u8 rlen;
};
static struct acpi_ec {
acpi_handle handle;
unsigned long gpe;
@ -105,9 +114,8 @@ 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;
struct transaction *curr;
spinlock_t curr_lock;
} *boot_ec, *first_ec;
/*
@ -150,7 +158,7 @@ static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
{
u8 x = inb(ec->data_addr);
pr_debug(PREFIX "---> data = 0x%2.2x\n", x);
return inb(ec->data_addr);
return x;
}
static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
@ -165,158 +173,172 @@ static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
outb(data, ec->data_addr);
}
static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event)
static int ec_transaction_done(struct acpi_ec *ec)
{
if (test_bit(EC_FLAGS_WAIT_GPE, &ec->flags))
return 0;
if (event == ACPI_EC_EVENT_OBF_1) {
if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
return 1;
} else if (event == ACPI_EC_EVENT_IBF_0) {
if (!(acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF))
return 1;
}
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&ec->curr_lock, flags);
if (!ec->curr || (!ec->curr->wlen && !ec->curr->rlen))
ret = 1;
spin_unlock_irqrestore(&ec->curr_lock, flags);
return ret;
}
static void gpe_transaction(struct acpi_ec *ec, u8 status)
{
unsigned long flags;
spin_lock_irqsave(&ec->curr_lock, flags);
if (!ec->curr)
goto unlock;
if (ec->curr->wlen > 0) {
if ((status & ACPI_EC_FLAG_IBF) == 0) {
acpi_ec_write_data(ec, *(ec->curr->wdata++));
--ec->curr->wlen;
} else
/* false interrupt, state didn't change */
++ec->curr->irq_count;
} else if (ec->curr->rlen > 0) {
if ((status & ACPI_EC_FLAG_OBF) == 1) {
*(ec->curr->rdata++) = acpi_ec_read_data(ec);
--ec->curr->rlen;
} else
/* false interrupt, state didn't change */
++ec->curr->irq_count;
}
unlock:
spin_unlock_irqrestore(&ec->curr_lock, flags);
}
static int acpi_ec_wait(struct acpi_ec *ec)
{
if (wait_event_timeout(ec->wait, ec_transaction_done(ec),
msecs_to_jiffies(ACPI_EC_DELAY)))
return 0;
/* missing GPEs, switch back to poll mode */
if (printk_ratelimit())
pr_info(PREFIX "missing confirmations, "
"switch off interrupt mode.\n");
set_bit(EC_FLAGS_NO_GPE, &ec->flags);
clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
return 1;
}
static void acpi_ec_gpe_query(void *ec_cxt);
static int ec_check_sci(struct acpi_ec *ec, u8 state)
{
if (state & ACPI_EC_FLAG_SCI) {
if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
return acpi_os_execute(OSL_EC_BURST_HANDLER,
acpi_ec_gpe_query, ec);
}
return 0;
}
static void ec_schedule_ec_poll(struct acpi_ec *ec)
static int ec_poll(struct acpi_ec *ec)
{
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);
}
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)))
return 0;
clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
if (acpi_ec_check_status(ec, event)) {
/* missing GPEs, switch back to poll mode */
if (printk_ratelimit())
pr_info(PREFIX "missing confirmations, "
"switch off interrupt mode.\n");
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))
return 0;
msleep(1);
}
if (acpi_ec_check_status(ec,event))
unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
msleep(1);
while (time_before(jiffies, delay)) {
gpe_transaction(ec, acpi_ec_read_status(ec));
msleep(1);
if (ec_transaction_done(ec))
return 0;
}
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,
const u8 * wdata, unsigned wdata_len,
u8 * rdata, unsigned rdata_len,
static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
struct transaction *t,
int force_poll)
{
int result = 0;
set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
unsigned long tmp;
int ret = 0;
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) {
pr_err(PREFIX
"write_cmd timeout, command = %d\n", command);
goto end;
}
set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
acpi_ec_write_data(ec, *(wdata++));
/* disable GPE during transaction if storm is detected */
if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
}
if (!rdata_len) {
result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll);
if (result) {
pr_err(PREFIX
"finish-write timeout, command = %d\n", command);
goto end;
}
} else if (command == ACPI_EC_COMMAND_QUERY)
/* start transaction */
spin_lock_irqsave(&ec->curr_lock, tmp);
/* following two actions should be kept atomic */
t->irq_count = 0;
ec->curr = t;
acpi_ec_write_cmd(ec, ec->curr->command);
if (ec->curr->command == ACPI_EC_COMMAND_QUERY)
clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
for (; rdata_len > 0; --rdata_len) {
result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll);
if (result) {
pr_err(PREFIX "read timeout, command = %d\n", command);
goto end;
}
/* Don't expect GPE after last read */
if (rdata_len > 1)
set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
*(rdata++) = acpi_ec_read_data(ec);
}
end:
spin_unlock_irqrestore(&ec->curr_lock, tmp);
/* if we selected poll mode or failed in GPE-mode do a poll loop */
if (force_poll ||
!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ||
acpi_ec_wait(ec))
ret = ec_poll(ec);
pr_debug(PREFIX "transaction end\n");
return result;
spin_lock_irqsave(&ec->curr_lock, tmp);
ec->curr = NULL;
spin_unlock_irqrestore(&ec->curr_lock, tmp);
if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
/* check if we received SCI during transaction */
ec_check_sci(ec, acpi_ec_read_status(ec));
/* it is safe to enable GPE outside of transaction */
acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
} else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
t->irq_count > ACPI_EC_STORM_THRESHOLD) {
pr_debug(PREFIX "GPE storm detected\n");
set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
}
return ret;
}
static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
const u8 * wdata, unsigned wdata_len,
u8 * rdata, unsigned rdata_len,
static int ec_check_ibf0(struct acpi_ec *ec)
{
u8 status = acpi_ec_read_status(ec);
return (status & ACPI_EC_FLAG_IBF) == 0;
}
static int ec_wait_ibf0(struct acpi_ec *ec)
{
unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
/* interrupt wait manually if GPE mode is not active */
unsigned long timeout = test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ?
msecs_to_jiffies(ACPI_EC_DELAY) : msecs_to_jiffies(1);
while (time_before(jiffies, delay))
if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), timeout))
return 0;
return -ETIME;
}
static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t,
int force_poll)
{
int status;
u32 glk;
if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata))
if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
return -EINVAL;
if (rdata)
memset(rdata, 0, rdata_len);
if (t->rdata)
memset(t->rdata, 0, t->rlen);
mutex_lock(&ec->lock);
if (ec->global_lock) {
status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
if (ACPI_FAILURE(status)) {
mutex_unlock(&ec->lock);
return -ENODEV;
status = -ENODEV;
goto unlock;
}
}
status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0);
if (status) {
if (ec_wait_ibf0(ec)) {
pr_err(PREFIX "input buffer is not empty, "
"aborting transaction\n");
status = -ETIME;
goto end;
}
status = acpi_ec_transaction_unlocked(ec, command,
wdata, wdata_len,
rdata, rdata_len,
force_poll);
end:
status = acpi_ec_transaction_unlocked(ec, t, force_poll);
end:
if (ec->global_lock)
acpi_release_global_lock(glk);
unlock:
mutex_unlock(&ec->lock);
return status;
}
@ -327,21 +349,32 @@ static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
int acpi_ec_burst_enable(struct acpi_ec *ec)
{
u8 d;
return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1, 0);
struct transaction t = {.command = ACPI_EC_BURST_ENABLE,
.wdata = NULL, .rdata = &d,
.wlen = 0, .rlen = 1};
return acpi_ec_transaction(ec, &t, 0);
}
int acpi_ec_burst_disable(struct acpi_ec *ec)
{
return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0, 0);
struct transaction t = {.command = ACPI_EC_BURST_DISABLE,
.wdata = NULL, .rdata = NULL,
.wlen = 0, .rlen = 0};
return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?
acpi_ec_transaction(ec, &t, 0) : 0;
}
static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
{
int result;
u8 d;
struct transaction t = {.command = ACPI_EC_COMMAND_READ,
.wdata = &address, .rdata = &d,
.wlen = 1, .rlen = 1};
result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ,
&address, 1, &d, 1, 0);
result = acpi_ec_transaction(ec, &t, 0);
*data = d;
return result;
}
@ -349,8 +382,11 @@ static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
{
u8 wdata[2] = { address, data };
return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE,
wdata, 2, NULL, 0, 0);
struct transaction t = {.command = ACPI_EC_COMMAND_WRITE,
.wdata = wdata, .rdata = NULL,
.wlen = 2, .rlen = 0};
return acpi_ec_transaction(ec, &t, 0);
}
/*
@ -412,12 +448,13 @@ int ec_transaction(u8 command,
u8 * rdata, unsigned rdata_len,
int force_poll)
{
struct transaction t = {.command = command,
.wdata = wdata, .rdata = rdata,
.wlen = wdata_len, .rlen = rdata_len};
if (!first_ec)
return -ENODEV;
return acpi_ec_transaction(first_ec, command, wdata,
wdata_len, rdata, rdata_len,
force_poll);
return acpi_ec_transaction(first_ec, &t, force_poll);
}
EXPORT_SYMBOL(ec_transaction);
@ -426,7 +463,9 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
{
int result;
u8 d;
struct transaction t = {.command = ACPI_EC_COMMAND_QUERY,
.wdata = NULL, .rdata = &d,
.wlen = 0, .rlen = 1};
if (!ec || !data)
return -EINVAL;
@ -436,7 +475,7 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
* bit to be cleared (and thus clearing the interrupt source).
*/
result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1, 0);
result = acpi_ec_transaction(ec, &t, 0);
if (result)
return result;
@ -513,46 +552,26 @@ static void acpi_ec_gpe_query(void *ec_cxt)
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);
u8 status;
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))
status = acpi_ec_read_status(ec);
gpe_transaction(ec, status);
if (ec_transaction_done(ec) && (status & ACPI_EC_FLAG_IBF) == 0)
wake_up(&ec->wait);
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 (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
!test_bit(EC_FLAGS_NO_GPE, &ec->flags) &&
in_interrupt()) {
ec_check_sci(ec, status);
if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
!test_bit(EC_FLAGS_NO_GPE, &ec->flags)) {
/* 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);
return ACPI_INTERRUPT_HANDLED;
}
/* --------------------------------------------------------------------------
@ -696,8 +715,7 @@ 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);
spin_lock_init(&ec->curr_lock);
return ec;
}
@ -736,22 +754,15 @@ ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
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");
if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
&acpi_ec_gpe_handler)))
pr_err(PREFIX "failed to remove gpe handler\n");
ec->handlers_installed = 0;
clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
}
static int acpi_ec_add(struct acpi_device *device)
@ -846,17 +857,15 @@ ec_parse_io_ports(struct acpi_resource *resource, void *context)
static int ec_install_handlers(struct acpi_ec *ec)
{
acpi_status status;
if (ec->handlers_installed)
if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
return 0;
status = acpi_install_gpe_handler(NULL, ec->gpe,
ACPI_GPE_EDGE_TRIGGERED,
&acpi_ec_gpe_handler, ec);
ACPI_GPE_EDGE_TRIGGERED,
&acpi_ec_gpe_handler, ec);
if (ACPI_FAILURE(status))
return -ENODEV;
acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
status = acpi_install_address_space_handler(ec->handle,
ACPI_ADR_SPACE_EC,
&acpi_ec_space_handler,
@ -877,7 +886,7 @@ static int ec_install_handlers(struct acpi_ec *ec)
}
}
ec->handlers_installed = 1;
set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
return 0;
}
@ -898,7 +907,6 @@ 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;
}
@ -917,7 +925,7 @@ static int acpi_ec_stop(struct acpi_device *device, int type)
int __init acpi_boot_ec_enable(void)
{
if (!boot_ec || boot_ec->handlers_installed)
if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags))
return 0;
if (!ec_install_handlers(boot_ec)) {
first_ec = boot_ec;

4
drivers/acpi/scan.c
View File

@ -1565,7 +1565,6 @@ static int acpi_bus_scan_fixed(struct acpi_device *root)
return result;
}
int __init acpi_boot_ec_enable(void);
static int __init acpi_scan_init(void)
{
@ -1599,9 +1598,6 @@ static int __init acpi_scan_init(void)
*/
result = acpi_bus_scan_fixed(acpi_root);
/* EC region might be needed at bus_scan, so enable it now */
acpi_boot_ec_enable();
if (!result)
result = acpi_bus_scan(acpi_root, &ops);

1
include/acpi/acpi_drivers.h
View File

@ -101,6 +101,7 @@ extern int acpi_power_nocheck;
-------------------------------------------------------------------------- */
#ifdef CONFIG_ACPI_EC
int acpi_ec_ecdt_probe(void);
int acpi_boot_ec_enable(void);
#endif
/* --------------------------------------------------------------------------