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authorBob Moore <robert.moore@intel.com>2009-08-13 13:42:19 +0800
committerLen Brown <len.brown@intel.com>2009-08-28 19:40:39 -0400
commit8a964236800839263b3dddd7f7851d666e7d53e1 (patch)
treefde7e01148c8d1db1866e66feb4f13c5b85b60df
parent1872bbc94b2d092ece22a8fbf1c3e81f0fba0052 (diff)
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>
-rw-r--r--drivers/acpi/acpica/hwxface.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/acpi/acpica/hwxface.c b/drivers/acpi/acpica/hwxface.c
index 4ead85f29215..647c7b6e6756 100644
--- 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);
}