diff options
Diffstat (limited to 'include/drm/drm_fixed.h')
| -rw-r--r-- | include/drm/drm_fixed.h | 49 |
1 files changed, 48 insertions, 1 deletions
diff --git a/include/drm/drm_fixed.h b/include/drm/drm_fixed.h index 553210c02ee0..33de514a5221 100644 --- a/include/drm/drm_fixed.h +++ b/include/drm/drm_fixed.h @@ -26,6 +26,8 @@ #define DRM_FIXED_H #include <linux/math64.h> +#include <linux/types.h> +#include <linux/wordpart.h> typedef union dfixed { u32 full; @@ -76,6 +78,23 @@ static inline u32 dfixed_div(fixed20_12 A, fixed20_12 B) #define DRM_FIXED_EPSILON 1LL #define DRM_FIXED_ALMOST_ONE (DRM_FIXED_ONE - DRM_FIXED_EPSILON) +/** + * @drm_sm2fixp + * + * Convert a 1.31.32 signed-magnitude fixed point to 32.32 + * 2s-complement fixed point + * + * @return s64 2s-complement fixed point + */ +static inline s64 drm_sm2fixp(__u64 a) +{ + if ((a & (1LL << 63))) { + return -(a & 0x7fffffffffffffffll); + } else { + return a; + } +} + static inline s64 drm_int2fixp(int a) { return ((s64)a) << DRM_FIXED_POINT; @@ -86,9 +105,14 @@ static inline int drm_fixp2int(s64 a) return ((s64)a) >> DRM_FIXED_POINT; } +static inline int drm_fixp2int_round(s64 a) +{ + return drm_fixp2int(a + DRM_FIXED_ONE / 2); +} + static inline int drm_fixp2int_ceil(s64 a) { - if (a > 0) + if (a >= 0) return drm_fixp2int(a + DRM_FIXED_ALMOST_ONE); else return drm_fixp2int(a - DRM_FIXED_ALMOST_ONE); @@ -208,4 +232,27 @@ static inline s64 drm_fixp_exp(s64 x) return sum; } +static inline int fxp_q4_from_int(int val_int) +{ + return val_int << 4; +} + +static inline int fxp_q4_to_int(int val_q4) +{ + return val_q4 >> 4; +} + +static inline int fxp_q4_to_int_roundup(int val_q4) +{ + return (val_q4 + 0xf) >> 4; +} + +static inline int fxp_q4_to_frac(int val_q4) +{ + return val_q4 & 0xf; +} + +#define FXP_Q4_FMT "%d.%04d" +#define FXP_Q4_ARGS(val_q4) fxp_q4_to_int(val_q4), (fxp_q4_to_frac(val_q4) * 625) + #endif |