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ACPI / EC: Remove duplicated ec_wait_ibf0() waiter
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> Cc: All applicable <stable@vger.kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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commit
9b80f0f73a
1 changed files with 1 additions and 26 deletions
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@ -281,23 +281,6 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
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return ret;
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}
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static int ec_check_ibf0(struct acpi_ec *ec)
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{
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u8 status = acpi_ec_read_status(ec);
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return (status & ACPI_EC_FLAG_IBF) == 0;
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}
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static int ec_wait_ibf0(struct acpi_ec *ec)
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{
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unsigned long delay = jiffies + msecs_to_jiffies(ec_delay);
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/* interrupt wait manually if GPE mode is not active */
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while (time_before(jiffies, delay))
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if (wait_event_timeout(ec->wait, ec_check_ibf0(ec),
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msecs_to_jiffies(1)))
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return 0;
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return -ETIME;
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}
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static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
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{
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int status;
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@ -318,12 +301,6 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
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goto unlock;
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}
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}
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if (ec_wait_ibf0(ec)) {
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pr_err("input buffer is not empty, "
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"aborting transaction\n");
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status = -ETIME;
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goto end;
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}
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pr_debug("transaction start (cmd=0x%02x, addr=0x%02x)\n",
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t->command, t->wdata ? t->wdata[0] : 0);
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/* disable GPE during transaction if storm is detected */
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@ -347,7 +324,6 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
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set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
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}
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pr_debug("transaction end\n");
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end:
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if (ec->global_lock)
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acpi_release_global_lock(glk);
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unlock:
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@ -653,8 +629,7 @@ static u32 acpi_ec_gpe_handler(acpi_handle gpe_device,
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spin_lock_irqsave(&ec->lock, flags);
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advance_transaction(ec);
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spin_unlock_irqrestore(&ec->lock, flags);
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if (ec_transaction_completed(ec) &&
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(acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) {
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if (ec_transaction_completed(ec)) {
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wake_up(&ec->wait);
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ec_check_sci(ec, acpi_ec_read_status(ec));
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}
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