[PATCH 4/9] drm/i915: Addition wrapper for fixed16.16 operation

Mahesh Kumar
2017-06-13T13:08:21Z

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 <mahesh1.kumar@intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index d0698c290cba..7b95dec9529b 100644
--- 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_fixed16(uint32_t val,
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";