Commit 28fe5c82 authored May 06, 2013 by Lan Tianyu Committed by Rafael J. Wysocki May 12, 2013

ACPI / EC: Restart transaction even when the IBF flag set

The EC driver works abnormally with IBF flag always set.
IBF means "The host has written a byte of data to the command
or data port, but the embedded controller has not yet read it".
If IBF is set in the EC status and not cleared, this will cause
all subsequent EC requests to fail with a timeout error.

Change the EC driver so that it doesn't refuse to restart a
transaction if IBF is set in the status.  Also increase the
number of transaction restarts to 5, as it turns out that 2
is not sufficient in some cases.

This bug happens on several different machines (Asus V1S,
Dell Latitude E6530, Samsung R719, Acer Aspire 5930G,
Sony Vaio SR19VN and others).

[rjw: Changelog]
References: https://bugzilla.kernel.org/show_bug.cgi?id=14733
References: https://bugzilla.kernel.org/show_bug.cgi?id=15560
References: https://bugzilla.kernel.org/show_bug.cgi?id=15946
References: https://bugzilla.kernel.org/show_bug.cgi?id=42945
References: https://bugzilla.kernel.org/show_bug.cgi?id=48221


Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Cc: All <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 4ef366c5

drivers/acpi/ec.c

+1 −3

Original line number	Diff line number	Diff line
		@@ -223,7 +223,7 @@ static int ec_check_sci_sync(struct acpi_ec *ec, u8 state)
		static int ec_poll(struct acpi_ec *ec)
		{
		unsigned long flags;
		int repeat = 2; /* number of command restarts */
		int repeat = 5; /* number of command restarts */
		while (repeat--) {
		unsigned long delay = jiffies +
		msecs_to_jiffies(ec_delay);
		@@ -241,8 +241,6 @@ static int ec_poll(struct acpi_ec *ec)
		}
		advance_transaction(ec, acpi_ec_read_status(ec));
		} while (time_before(jiffies, delay));
		if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
		break;
		pr_debug(PREFIX "controller reset, restart transaction\n");
		spin_lock_irqsave(&ec->lock, flags);
		start_transaction(ec);

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