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: Alexey Starikovskiy <[email protected]>
Signed-off-by: Len Brown <[email protected]>

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 63862dfe347b65337d9d5838acdd48109d24a66b..445ecbabbe7686c3a2a00a548a96821cd02d46be 100644 (file)
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -575,6 +575,8 @@ acpi_ec_space_handler(u32 function, acpi_physical_address address,
        if (bits != 8 && acpi_strict)
                return AE_BAD_PARAMETER;
 
+       acpi_ec_burst_enable(ec);
+
        if (function == ACPI_READ) {
                result = acpi_ec_read(ec, address, &temp);
                *value = temp;
@@ -594,6 +596,8 @@ acpi_ec_space_handler(u32 function, acpi_physical_address address,
                }
        }
 
+       acpi_ec_burst_disable(ec);
+
        switch (result) {
        case -EINVAL:
                return AE_BAD_PARAMETER;