From 6ea593c029d8f7c847fd68392eeb5a284ee96bd7 Mon Sep 17 00:00:00 2001 From: "Kumar, Mahesh" Date: Wed, 5 Jul 2017 20:01:47 +0530 Subject: [PATCH] drm/i915: Addition wrapper for fixed16.16 operation Git-commit: 6ea593c029d8f7c847fd68392eeb5a284ee96bd7 Patch-mainline: v4.14-rc1 References: FATE#322643 bsc#1055900 This patch introduce addition wrapper for fixed point 16.16 operations. Which will be used by later patches to avoid direct member variables access of fixed_16_16_t structure. add_fixed16 : takes 2 fixed_16_16_t variable & returns fixed_16_16_t add_fixed16_u32 : takes fixed_16_16_t & u32 variable & returns fixed_16_16_t Signed-off-by: Mahesh Kumar Reviewed-by: Maarten Lankhorst Signed-off-by: Maarten Lankhorst Link: http://patchwork.freedesktop.org/patch/msgid/20170705143154.32132-5-mahesh1.kumar@intel.com Acked-by: Takashi Iwai --- drivers/gpu/drm/i915/i915_drv.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -224,6 +224,25 @@ static inline uint_fixed_16_16_t mul_u32 return clamp_u64_to_fixed16(intermediate_val); } +static inline uint_fixed_16_16_t add_fixed16(uint_fixed_16_16_t add1, + uint_fixed_16_16_t add2) +{ + uint64_t interm_sum; + + interm_sum = (uint64_t) add1.val + add2.val; + return clamp_u64_to_fixed16(interm_sum); +} + +static inline uint_fixed_16_16_t add_fixed16_u32(uint_fixed_16_16_t add1, + uint32_t add2) +{ + uint64_t interm_sum; + uint_fixed_16_16_t interm_add2 = u32_to_fixed16(add2); + + interm_sum = (uint64_t) add1.val + interm_add2.val; + return clamp_u64_to_fixed16(interm_sum); +} + static inline const char *yesno(bool v) { return v ? "yes" : "no";