ACPICA: Revert "Fix for implicit result conversion for the To____ functions"

ACPICA commit 0e44fee13434766ebbb4d156e3ed45604508d7c3

This reverts commit e1342c9f2dde37a67e916099658b65984ef8a434.
Implicit conversion should in fact be disabled for the "explicit
conversion" operators. This is stated in the ACPI specification.
The operators affected are:
to_integer
to_string
to_buffer
to_decimal_string
to_hex_string
to_BCD
from_BCD

Link: https://github.com/acpica/acpica/commit/0e44fee1Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/acopcode.h

@@ -251,7 +251,7 @@
 #define ARGI_FIELD_OP                   ARGI_INVALID_OPCODE
 #define ARGI_FIND_SET_LEFT_BIT_OP       ARGI_LIST2 (ARGI_INTEGER,    ARGI_TARGETREF)
 #define ARGI_FIND_SET_RIGHT_BIT_OP      ARGI_LIST2 (ARGI_INTEGER,    ARGI_TARGETREF)
-#define ARGI_FROM_BCD_OP                ARGI_LIST2 (ARGI_INTEGER,    ARGI_TARGETREF)
+#define ARGI_FROM_BCD_OP                ARGI_LIST2 (ARGI_INTEGER,    ARGI_FIXED_TARGET)
 #define ARGI_IF_OP                      ARGI_INVALID_OPCODE
 #define ARGI_INCREMENT_OP               ARGI_LIST1 (ARGI_TARGETREF)
 #define ARGI_INDEX_FIELD_OP             ARGI_INVALID_OPCODE
@@ -315,12 +315,12 @@
 #define ARGI_SUBTRACT_OP                ARGI_LIST3 (ARGI_INTEGER,    ARGI_INTEGER,       ARGI_TARGETREF)
 #define ARGI_THERMAL_ZONE_OP            ARGI_INVALID_OPCODE
 #define ARGI_TIMER_OP                   ARG_NONE
-#define ARGI_TO_BCD_OP                  ARGI_LIST2 (ARGI_INTEGER,    ARGI_TARGETREF)
-#define ARGI_TO_BUFFER_OP               ARGI_LIST2 (ARGI_COMPUTEDATA,ARGI_TARGETREF)
-#define ARGI_TO_DEC_STR_OP              ARGI_LIST2 (ARGI_COMPUTEDATA,ARGI_TARGETREF)
-#define ARGI_TO_HEX_STR_OP              ARGI_LIST2 (ARGI_COMPUTEDATA,ARGI_TARGETREF)
-#define ARGI_TO_INTEGER_OP              ARGI_LIST2 (ARGI_COMPUTEDATA,ARGI_TARGETREF)
-#define ARGI_TO_STRING_OP               ARGI_LIST3 (ARGI_BUFFER,     ARGI_INTEGER,       ARGI_TARGETREF)
+#define ARGI_TO_BCD_OP                  ARGI_LIST2 (ARGI_INTEGER,    ARGI_FIXED_TARGET)
+#define ARGI_TO_BUFFER_OP               ARGI_LIST2 (ARGI_COMPUTEDATA,ARGI_FIXED_TARGET)
+#define ARGI_TO_DEC_STR_OP              ARGI_LIST2 (ARGI_COMPUTEDATA,ARGI_FIXED_TARGET)
+#define ARGI_TO_HEX_STR_OP              ARGI_LIST2 (ARGI_COMPUTEDATA,ARGI_FIXED_TARGET)
+#define ARGI_TO_INTEGER_OP              ARGI_LIST2 (ARGI_COMPUTEDATA,ARGI_FIXED_TARGET)
+#define ARGI_TO_STRING_OP               ARGI_LIST3 (ARGI_BUFFER,     ARGI_INTEGER,       ARGI_FIXED_TARGET)
 #define ARGI_UNLOAD_OP                  ARGI_LIST1 (ARGI_DDBHANDLE)
 #define ARGI_VAR_PACKAGE_OP             ARGI_LIST1 (ARGI_INTEGER)
 #define ARGI_WAIT_OP                    ARGI_LIST2 (ARGI_EVENT,      ARGI_INTEGER)

drivers/acpi/acpica/amlcode.h

@@ -274,23 +274,9 @@
 #define ARGI_DEVICE_REF             0x0D
 #define ARGI_REFERENCE              0x0E
 #define ARGI_TARGETREF              0x0F	/* Target, subject to implicit conversion */
-#define ARGI_SIMPLE_TARGET          0x10	/* Name, Local, Arg -- no implicit conversion */
-#define ARGI_STORE_TARGET           0x11	/* Target for store is TARGETREF + package objects */
-/*
- * #define ARGI_FIXED_TARGET           0x10     Target, no implicit conversion
- *
- * Removed 10/2016. ARGI_FIXED_TARGET was used for these operators:
- *      from_BCD
- *      to_BCD
- *      to_decimal_string
- *      to_hex_string
- *      to_integer
- *      to_buffer
- * The purpose of this type was to disable "implicit result conversion",
- * but this was incorrect per the ACPI spec and other ACPI implementations.
- * These operators now have the target operand defined as a normal
- * ARGI_TARGETREF.
- */
+#define ARGI_FIXED_TARGET           0x10	/* Target, no implicit conversion */
+#define ARGI_SIMPLE_TARGET          0x11	/* Name, Local, Arg -- no implicit conversion */
+#define ARGI_STORE_TARGET           0x12	/* Target for store is TARGETREF + package objects */
 
 /* Multiple/complex types */
 

drivers/acpi/acpica/exconvrt.c

@@ -598,6 +598,7 @@ acpi_ex_convert_to_target_type(acpi_object_type destination_type,
 	 */
 	switch (GET_CURRENT_ARG_TYPE(walk_state->op_info->runtime_args)) {
 	case ARGI_SIMPLE_TARGET:
+	case ARGI_FIXED_TARGET:
 	case ARGI_INTEGER_REF:	/* Handles Increment, Decrement cases */
 
 		switch (destination_type) {

drivers/acpi/acpica/exresop.c

@@ -305,6 +305,7 @@ acpi_ex_resolve_operands(u16 opcode,
 		case ARGI_OBJECT_REF:
 		case ARGI_DEVICE_REF:
 		case ARGI_TARGETREF:	/* Allows implicit conversion rules before store */
+		case ARGI_FIXED_TARGET:	/* No implicit conversion before store to target */
 		case ARGI_SIMPLE_TARGET:	/* Name, Local, or arg - no implicit conversion  */
 		case ARGI_STORE_TARGET: