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ACPI: EC: Workaround for optimized controllers 

Some controllers fail to send confirmation GPE after address write.
Detect this and don't expect such confirmation in future.
This is a generalization of previous workaround
(66c5f4e736), which did only read address.

http://bugzilla.kernel.org/show_bug.cgi?id=9327

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Tested-by: Romano Giannetti <romano.giannetti@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>
hifive-unleashed-5.1
Alexey Starikovskiy 2007-11-19 01:37:03 +03:00 committed by Len Brown
parent 2ffbb8377c
commit f2d68935ba
1 changed files with 22 additions and 13 deletions
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35
drivers/acpi/ec.c
View File

@ -75,7 +75,8 @@ 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_ONLY_IBF_GPE, /* Expect GPE only for IBF = 0 event */
EC_FLAGS_NO_ADDRESS_GPE, /* Expect GPE only for non-address event */
EC_FLAGS_ADDRESS, /* Address is being written */
};
static int acpi_ec_remove(struct acpi_device *device, int type);
@ -166,38 +167,45 @@ static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event)
static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll)
{
int ret = 0;
if (unlikely(test_bit(EC_FLAGS_ADDRESS, &ec->flags) &&
test_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags)))
force_poll = 1;
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;
goto end;
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 anymore */
printk(KERN_INFO PREFIX "missing OBF_1 confirmation,"
"switching to degraded mode.\n");
set_bit(EC_FLAGS_ONLY_IBF_GPE, &ec->flags);
if (test_bit(EC_FLAGS_ADDRESS, &ec->flags)) {
/* miss address GPE, don't expect it anymore */
printk(KERN_INFO PREFIX "missing address confirmation,"
"don't expect it any longer.\n");
set_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags);
} else {
/* missing GPEs, switch back to poll mode */
printk(KERN_INFO PREFIX "missing IBF_1 confirmations,"
printk(KERN_INFO PREFIX "missing confirmations,"
"switch off interrupt mode.\n");
clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
}
return 0;
goto end;
}
} 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;
goto end;
}
}
printk(KERN_ERR PREFIX "acpi_ec_wait timeout,"
" status = %d, expect_event = %d\n",
acpi_ec_read_status(ec), event);
return -ETIME;
ret = -ETIME;
end:
clear_bit(EC_FLAGS_ADDRESS, &ec->flags);
return ret;
}
static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
@ -216,6 +224,9 @@ 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++));
}
@ -231,8 +242,6 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
for (; rdata_len > 0; --rdata_len) {
if (test_bit(EC_FLAGS_ONLY_IBF_GPE, &ec->flags))
force_poll = 1;
result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll);
if (result) {
printk(KERN_ERR PREFIX "read timeout, command = %d\n",