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ACPI: EC: Add workaround for "optimized" controllers

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Some controllers do not send interrupts for OBF=1 event, but send
them for IBF=0. Add workaround for them.

Reference: http://bugzilla.kernel.org/show_bug.cgi?id=8459

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Alexey Starikovskiy 2007-10-22 14:18:56 +04:00 committed by Len Brown
parent 1c55053c21
commit 66c5f4e736
1 changed files with 9 additions and 1 deletions
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10
drivers/acpi/ec.c
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@ -75,6 +75,7 @@ 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 */
};
static int acpi_ec_remove(struct acpi_device *device, int type);
@ -172,7 +173,12 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll)
return 0;
clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
if (acpi_ec_check_status(ec, event)) {
clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
if (event == ACPI_EC_EVENT_OBF_1)
/* miss OBF = 1 GPE, don't expect it anymore */
set_bit(EC_FLAGS_ONLY_IBF_GPE, &ec->flags);
else
/* missing GPEs, switch back to poll mode */
clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
return 0;
}
} else {
@ -220,6 +226,8 @@ 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",