diff options
| author | Alexey Starikovskiy <astarikovskiy@suse.de> | 2008-11-08 21:42:30 +0300 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2008-11-11 18:34:19 -0500 |
| commit | dd15f8c42af09031e27da5b4d697ce925511f2e1 (patch) | |
| tree | 284d25e1c8387df3672d88b9108c06b283b6bad5 /drivers/acpi/ec.c | |
| parent | f8248434e6a11d7cd314281be3b39bbcf82fc243 (diff) | |
| download | lwn-dd15f8c42af09031e27da5b4d697ce925511f2e1.tar.gz lwn-dd15f8c42af09031e27da5b4d697ce925511f2e1.zip | |
ACPI: EC: wait for last write gpe
There is a possibility that EC might break if next command is
issued within 1 us after write or burst-disable command.
Suggestd-by: Zhao Yakui <yakui.zhao@intel.com>
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 | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index b340e08cf1d9..cebd65d2e2a9 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -102,6 +102,7 @@ struct transaction { u8 command; u8 wlen; u8 rlen; + bool done; }; static struct acpi_ec { @@ -178,7 +179,7 @@ static int ec_transaction_done(struct acpi_ec *ec) unsigned long flags; int ret = 0; spin_lock_irqsave(&ec->curr_lock, flags); - if (!ec->curr || (!ec->curr->wlen && !ec->curr->rlen)) + if (!ec->curr || ec->curr->done) ret = 1; spin_unlock_irqrestore(&ec->curr_lock, flags); return ret; @@ -195,17 +196,20 @@ static void gpe_transaction(struct acpi_ec *ec, u8 status) acpi_ec_write_data(ec, *(ec->curr->wdata++)); --ec->curr->wlen; } else - /* false interrupt, state didn't change */ - ++ec->curr->irq_count; - + goto err; } else if (ec->curr->rlen > 0) { if ((status & ACPI_EC_FLAG_OBF) == 1) { *(ec->curr->rdata++) = acpi_ec_read_data(ec); - --ec->curr->rlen; + if (--ec->curr->rlen == 0) + ec->curr->done = true; } else - /* false interrupt, state didn't change */ - ++ec->curr->irq_count; - } + goto err; + } else if (ec->curr->wlen == 0 && (status & ACPI_EC_FLAG_IBF) == 0) + ec->curr->done = true; + goto unlock; +err: + /* false interrupt, state didn't change */ + ++ec->curr->irq_count; unlock: spin_unlock_irqrestore(&ec->curr_lock, flags); } @@ -265,6 +269,7 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, spin_lock_irqsave(&ec->curr_lock, tmp); /* following two actions should be kept atomic */ t->irq_count = 0; + t->done = false; ec->curr = t; acpi_ec_write_cmd(ec, ec->curr->command); if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |