diff options
author | Alexey Starikovskiy <astarikovskiy@suse.de> | 2007-11-18 22:37:03 (GMT) |
---|---|---|
committer | Len Brown <len.brown@intel.com> | 2007-11-19 06:05:01 (GMT) |
commit | f2d68935ba08cf80f151bbdb5628381184e4a498 (patch) | |
tree | be4b362db10ff61d514e4c56f480eae8c020d0f7 /drivers/acpi/ec.c | |
parent | 2ffbb8377c7a0713baf6644e285adc27a5654582 (diff) | |
download | linux-fsl-qoriq-f2d68935ba08cf80f151bbdb5628381184e4a498.tar.xz |
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
(66c5f4e7367b0085652931b2f3366de29e7ff5ec), 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>
Diffstat (limited to 'drivers/acpi/ec.c')
-rw-r--r-- | drivers/acpi/ec.c | 35 |
1 files changed, 22 insertions, 13 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 06b78e5..390f8f8 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -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", |