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authorAlexey Starikovskiy <astarikovskiy@suse.de>2007-10-22 14:18:56 +0400
committerLen Brown <len.brown@intel.com>2007-10-25 16:31:31 -0400
commit66c5f4e7367b0085652931b2f3366de29e7ff5ec (patch)
treeb4745520c76a7ce77dff0a7627b933e7c0ddfdeb /drivers/acpi
parent1c55053c21706ccf1fdb26b4bb6d05c4a2782ffe (diff)
ACPI: EC: Add workaround for "optimized" controllers
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>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/ec.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 41a21fcdbcb..202db575d5d 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -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",