[Intel-gfx] [PATCH 02/11] drm/i915: Add more wrapper for fixed_point_16_16 operations

[Mahesh Kumar]

This patch adds few wrapper to perform fixed_point_16_16 operations
mul_u32_fixed_16_16_round_up : Multiplies u32 and fixed_16_16_t
				variables & returns u32 result with
				rounding-off.
mul_fixed_16_16 : Multiplies two fixed_16_16_t variable & returns
				fixed_16_16
div_round_up_fixed_16_16 : Perform division operation on fixed_16_16_t
				variables & return u32 result with round-off
fixed_16_16_div_round_up_u64 : devide uint32_t variable by fixed_16_16
				variable and round_up the result to uint32_t.

These wrappers will be used by later patches in the series.

Signed-off-by: Mahesh Kumar <mahesh1.kumar at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h | 43 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 5804734d30a3..5ff0091707c0 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -152,6 +152,38 @@ static inline uint_fixed_16_16_t max_fixed_16_16(uint_fixed_16_16_t max1,
 	return max;
 }
 
+static inline uint32_t div_round_up_fixed_16_16(uint_fixed_16_16_t val,
+						uint_fixed_16_16_t d)
+{
+	return DIV_ROUND_UP(val.val, d.val);
+}
+
+static inline uint32_t mul_u32_fixed_16_16_round_up(uint32_t val,
+						    uint_fixed_16_16_t mul)
+{
+       uint64_t intermediate_val;
+       uint32_t result;
+
+       intermediate_val = (uint64_t) val * mul.val;
+       intermediate_val = DIV_ROUND_UP_ULL(intermediate_val, 1 << 16);
+       WARN_ON(intermediate_val >> 32);
+       result = clamp_t(uint32_t, intermediate_val, 0, ~0);
+       return result;
+}
+
+static inline uint_fixed_16_16_t mul_fixed_16_16(uint_fixed_16_16_t val,
+						 uint_fixed_16_16_t mul)
+{
+	uint64_t intermediate_val;
+	uint_fixed_16_16_t fp;
+
+	intermediate_val = (uint64_t) val.val * mul.val;
+	intermediate_val = intermediate_val >> 16;
+	WARN_ON(intermediate_val >> 32);
+	fp.val = clamp_t(uint32_t, intermediate_val, 0, ~0);
+	return fp;
+}
+
 static inline uint_fixed_16_16_t fixed_16_16_div(uint32_t val, uint32_t d)
 {
 	uint_fixed_16_16_t fp, res;
@@ -174,6 +206,17 @@ static inline uint_fixed_16_16_t fixed_16_16_div_u64(uint32_t val, uint32_t d)
 	return res;
 }
 
+static inline uint32_t fixed_16_16_div_round_up_u64(uint32_t val,
+						    uint_fixed_16_16_t d)
+{
+	uint64_t interm_val;
+
+	interm_val = (uint64_t)val << 16;
+	interm_val = DIV_ROUND_UP_ULL(interm_val, d.val);
+	WARN_ON(interm_val >> 32);
+	return clamp_t(uint32_t, interm_val, 0, ~0);
+}
+
 static inline uint_fixed_16_16_t mul_u32_fixed_16_16(uint32_t val,
 						     uint_fixed_16_16_t mul)
 {
-- 
2.11.0