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>
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 41a21fc..202db57 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -75,6 +75,7 @@
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 @@
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 @@
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",