drm/amd/display: add some math functions for dcn_calc_math

Implement floor, ceil, and fabs

Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c

@@ -73,6 +73,17 @@ float dcn_bw_floor2(const float arg, const float significance)
 		return 0;
 	return ((int) (arg / significance)) * significance;
 }
+float dcn_bw_floor(const float arg)
+{
+	return ((int) (arg));
+}
+
+float dcn_bw_ceil(const float arg)
+{
+	float flr = dcn_bw_floor2(arg, 1);
+
+	return flr + 0.00001 >= arg ? arg : flr + 1;
+}
 
 float dcn_bw_ceil2(const float arg, const float significance)
 {
@@ -109,6 +120,15 @@ float dcn_bw_pow(float a, float exp)
 	}
 }
 
+double dcn_bw_fabs(double a)
+{
+	if (a > 0)
+		return (a);
+	else
+		return (-a);
+}
+
+
 float dcn_bw_log(float a, float b)
 {
 	int * const exp_ptr = (int *)(&a);

drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.h

@@ -31,10 +31,13 @@ float dcn_bw_min2(const float arg1, const float arg2);
 unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2);
 float dcn_bw_max2(const float arg1, const float arg2);
 float dcn_bw_floor2(const float arg, const float significance);
+float dcn_bw_floor(const float arg);
 float dcn_bw_ceil2(const float arg, const float significance);
+float dcn_bw_ceil(const float arg);
 float dcn_bw_max3(float v1, float v2, float v3);
 float dcn_bw_max5(float v1, float v2, float v3, float v4, float v5);
 float dcn_bw_pow(float a, float exp);
 float dcn_bw_log(float a, float b);
+double dcn_bw_fabs(double a);
 
 #endif /* _DCN_CALC_MATH_H_ */

drivers/gpu/drm/amd/display/dc/dml/dml_inline_defs.h

@@ -129,4 +129,12 @@ static inline unsigned int dml_round_to_multiple(unsigned int num,
 	else
 		return (num - remainder);
 }
+static inline double dml_abs(double a)
+{
+	if (a > 0)
+		return a;
+	else
+		return (a*(-1));
+}
+
 #endif