diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c index b6abe0f3bb15..7600a4a4abc7 100644 --- a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c +++ b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c @@ -25,37 +25,44 @@ #include "dcn_calc_math.h" +#define isNaN(number) ((number) != (number)) + +/* + * NOTE: + * This file is gcc-parseable HW gospel, coming straight from HW engineers. + * + * It doesn't adhere to Linux kernel style and sometimes will do things in odd + * ways. Unless there is something clearly wrong with it the code should + * remain as-is as it provides us with a guarantee from HW that it is correct. + */ + float dcn_bw_mod(const float arg1, const float arg2) { - if (arg1 != arg1) + if (isNaN(arg1)) return arg2; - if (arg2 != arg2) + if (isNaN(arg2)) return arg1; return arg1 - arg1 * ((int) (arg1 / arg2)); } float dcn_bw_min2(const float arg1, const float arg2) { - if (arg1 != arg1) + if (isNaN(arg1)) return arg2; - if (arg2 != arg2) + if (isNaN(arg2)) return arg1; return arg1 < arg2 ? arg1 : arg2; } unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2) { - if (arg1 != arg1) - return arg2; - if (arg2 != arg2) - return arg1; return arg1 > arg2 ? arg1 : arg2; } float dcn_bw_max2(const float arg1, const float arg2) { - if (arg1 != arg1) + if (isNaN(arg1)) return arg2; - if (arg2 != arg2) + if (isNaN(arg2)) return arg1; return arg1 > arg2 ? arg1 : arg2; } |