drm/amd/display: Move bw_fixed macros to header file

The macros defined at bw_fixed are important mathematical definitions,
specifying masks to get the fractional part and the maximum and minimum
values of I64. In order to enable unit tests for bw_fixed, it is
relevant to have access to those macros. This commit moves the macros to
the header file, making it accessible to future unit tests.

Signed-off-by: Maíra Canal <maira.canal@usp.br>

drivers/gpu/drm/amd/display/dc/dml/calcs/bw_fixed.c

@@ -26,19 +26,7 @@
 #include "bw_fixed.h"
 
 
-#define MIN_I64 \
-	(int64_t)(-(1LL << 63))
-
-#define MAX_I64 \
-	(int64_t)((1ULL << 63) - 1)
-
-#define FRACTIONAL_PART_MASK \
-	((1ULL << BW_FIXED_BITS_PER_FRACTIONAL_PART) - 1)
-
-#define GET_FRACTIONAL_PART(x) \
-	(FRACTIONAL_PART_MASK & (x))
-
-static uint64_t abs_i64(int64_t arg)
+uint64_t abs_i64(int64_t arg)
 {
 	if (arg >= 0)
 		return (uint64_t)(arg);

drivers/gpu/drm/amd/display/dc/inc/bw_fixed.h

@@ -33,12 +33,26 @@ struct bw_fixed {
 	int64_t value;
 };
 
+#define MIN_I64 \
+	(int64_t)(-(1ULL << 63))
+
+#define MAX_I64 \
+	(int64_t)((1ULL << 63) - 1)
+
+#define FRACTIONAL_PART_MASK \
+	((1ULL << BW_FIXED_BITS_PER_FRACTIONAL_PART) - 1)
+
+#define GET_FRACTIONAL_PART(x) \
+	(FRACTIONAL_PART_MASK & (x))
+
 #define BW_FIXED_MIN_I32 \
 	(int64_t)(-(1LL << (63 - BW_FIXED_BITS_PER_FRACTIONAL_PART)))
 
 #define BW_FIXED_MAX_I32 \
 	(int64_t)((1ULL << (63 - BW_FIXED_BITS_PER_FRACTIONAL_PART)) - 1)
 
+uint64_t abs_i64(int64_t arg);
+
 static inline struct bw_fixed bw_min2(const struct bw_fixed arg1,
 				      const struct bw_fixed arg2)
 {