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@xxxxxxxxx>
---
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
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