From: Dmytro Laktyushkin <[email protected]>
Signed-off-by: Dmytro Laktyushkin <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Harry Wentland <[email protected]>
---
.../gpu/drm/amd/display/include/fixed31_32.h | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/include/fixed31_32.h
b/drivers/gpu/drm/amd/display/include/fixed31_32.h
index ebfd33e91ee8..61f11e23bf70 100644
--- a/drivers/gpu/drm/amd/display/include/fixed31_32.h
+++ b/drivers/gpu/drm/amd/display/include/fixed31_32.h
@@ -496,4 +496,21 @@ unsigned int dc_fixpt_clamp_u0d10(struct fixed31_32 arg);
int dc_fixpt_s4d19(struct fixed31_32 arg);
+static inline struct fixed31_32 dc_fixpt_truncate(struct fixed31_32 arg,
unsigned int frac_bits)
+{
+ bool negative = arg.value < 0;
+
+ if (frac_bits >= FIXED31_32_BITS_PER_FRACTIONAL_PART) {
+ ASSERT(frac_bits == FIXED31_32_BITS_PER_FRACTIONAL_PART);
+ return arg;
+ }
+
+ if (negative)
+ arg.value = -arg.value;
+ arg.value &= (~0LL) << (FIXED31_32_BITS_PER_FRACTIONAL_PART -
frac_bits);
+ if (negative)
+ arg.value = -arg.value;
+ return arg;
+}
+
#endif
--
2.17.0
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