diff options
| author | Alexey Starikovskiy <astarikovskiy@suse.de> | 2007-10-22 14:18:56 +0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-10-25 16:31:31 -0400 |
| commit | 66c5f4e7367b0085652931b2f3366de29e7ff5ec (patch) | |
| tree | b4745520c76a7ce77dff0a7627b933e7c0ddfdeb /drivers/acpi/ec.c | |
| parent | 1c55053c21706ccf1fdb26b4bb6d05c4a2782ffe (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/ec.c')
| -rw-r--r-- | drivers/acpi/ec.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 41a21fcdbcb8..202db575d5db 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", |