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| author | Lv Zheng <lv.zheng@intel.com> | 2014-06-15 08:41:48 +0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2014-08-06 18:07:35 +0100 |
| commit | 0038798270d8139fde6ee836f6ad8d96f932275e (patch) | |
| tree | 522719db0bf40d960f0ae31ae09dc0a2e3a7c66e /drivers/acpi | |
| parent | 1fac28d9b785fe4149b8bf6642bce5ff1bf6304e (diff) | |
| download | kernel_samsung_smdk4412-0038798270d8139fde6ee836f6ad8d96f932275e.zip kernel_samsung_smdk4412-0038798270d8139fde6ee836f6ad8d96f932275e.tar.gz kernel_samsung_smdk4412-0038798270d8139fde6ee836f6ad8d96f932275e.tar.bz2 | |
ACPI / EC: Remove duplicated ec_wait_ibf0() waiter
commit 9b80f0f73ae1583c22325ede341c74195847618c upstream.
After we've added the first command byte write into advance_transaction(),
the IBF=0 waiter is duplicated with the command completion waiter
implemented in the ec_poll() because:
If IBF=1 blocked the first command byte write invoked in the task
context ec_poll(), it would be kicked off upon IBF=0 interrupt or timed
out and retried again in the task context.
Remove this seperate and duplicate IBF=0 waiter. By doing so we can
reduce the overall number of times to access the EC_SC(R) status
register.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=70891
Link: https://bugzilla.kernel.org/show_bug.cgi?id=63931
Link: https://bugzilla.kernel.org/show_bug.cgi?id=59911
Reported-and-tested-by: Gareth Williams <gareth@garethwilliams.me.uk>
Reported-and-tested-by: Hans de Goede <jwrdegoede@fedoraproject.org>
Reported-by: Barton Xu <tank.xuhan@gmail.com>
Tested-by: Steffen Weber <steffen.weber@gmail.com>
Tested-by: Arthur Chen <axchen@nvidia.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/ec.c | 27 |
1 files changed, 1 insertions, 26 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 4361027..38c9ce3 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -288,23 +288,6 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, return ret; } -static int ec_check_ibf0(struct acpi_ec *ec) -{ - u8 status = acpi_ec_read_status(ec); - return (status & ACPI_EC_FLAG_IBF) == 0; -} - -static int ec_wait_ibf0(struct acpi_ec *ec) -{ - unsigned long delay = jiffies + msecs_to_jiffies(ec_delay); - /* interrupt wait manually if GPE mode is not active */ - while (time_before(jiffies, delay)) - if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), - msecs_to_jiffies(1))) - return 0; - return -ETIME; -} - static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) { int status; @@ -325,12 +308,6 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) goto unlock; } } - if (ec_wait_ibf0(ec)) { - pr_err(PREFIX "input buffer is not empty, " - "aborting transaction\n"); - status = -ETIME; - goto end; - } pr_debug(PREFIX "transaction start (cmd=0x%02x, addr=0x%02x)\n", t->command, t->wdata ? t->wdata[0] : 0); /* disable GPE during transaction if storm is detected */ @@ -354,7 +331,6 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) set_bit(EC_FLAGS_GPE_STORM, &ec->flags); } pr_debug(PREFIX "transaction end\n"); -end: if (ec->global_lock) acpi_release_global_lock(glk); unlock: @@ -670,8 +646,7 @@ static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, spin_lock_irqsave(&ec->curr_lock, flags); advance_transaction(ec); spin_unlock_irqrestore(&ec->curr_lock, flags); - if (ec_transaction_completed(ec) && - (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { + if (ec_transaction_completed(ec)) { wake_up(&ec->wait); ec_check_sci(ec, acpi_ec_read_status(ec)); } |