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Commit b3b233c7 authored by Alexey Starikovskiy's avatar Alexey Starikovskiy Committed by Len Brown
Browse files

ACPI: EC: Some hardware requires burst mode to operate properly 

Burst mode temporary (50 ms) locks EC to do only transactions with
driver, without it some hardware returns abstract garbage.

Reference: http://bugzilla.kernel.org/show_bug.cgi?id=9341



Signed-off-by: default avatarAlexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 3e71a87d

drivers/acpi/ec.c

+4 −0
Original line number Original line Diff line number Diff line
@@ -575,6 +575,8 @@ acpi_ec_space_handler(u32 function, acpi_physical_address address, 
	if (bits != 8 && acpi_strict)

	if (bits != 8 && acpi_strict)

		return AE_BAD_PARAMETER;

		return AE_BAD_PARAMETER;





	acpi_ec_burst_enable(ec);



	if (function == ACPI_READ) {

	if (function == ACPI_READ) {

		result = acpi_ec_read(ec, address, &temp);

		result = acpi_ec_read(ec, address, &temp);

		*value = temp;

		*value = temp;
@@ -594,6 +596,8 @@ acpi_ec_space_handler(u32 function, acpi_physical_address address, 
		}

		}

	}

	}





	acpi_ec_burst_disable(ec);



	switch (result) {

	switch (result) {

	case -EINVAL:

	case -EINVAL:

		return AE_BAD_PARAMETER;

		return AE_BAD_PARAMETER;