ACPICA: acpi_reset: Bypass port validation mechanism

Allow writes to reserved ports. This change may eventually be
driven down in to acpi_write and acpi_read.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/acpica/hwxface.c b/drivers/acpi/acpica/hwxface.c
index 4ead85f..647c7b6 100644 (file)
--- a/drivers/acpi/acpica/hwxface.c
+++ b/drivers/acpi/acpica/hwxface.c
@@ -78,9 +78,22 @@ acpi_status acpi_reset(void)
                return_ACPI_STATUS(AE_NOT_EXIST);
        }
 
-       /* Write the reset value to the reset register */
+       if (reset_reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
+               /*
+                * For I/O space, write directly to the OSL. This bypasses the port
+                * validation mechanism, which may block a valid write to the reset
+                * register.
+                */
+               status =
+                   acpi_os_write_port((acpi_io_address) reset_reg->address,
+                                      acpi_gbl_FADT.reset_value,
+                                      reset_reg->bit_width);
+       } else {
+               /* Write the reset value to the reset register */
+
+               status = acpi_hw_write(acpi_gbl_FADT.reset_value, reset_reg);
+       }
 
-       status = acpi_hw_write(acpi_gbl_FADT.reset_value, reset_reg);
        return_ACPI_STATUS(status);
 }