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From 087833951a00439a47fd83d4ce587e55e83acde9 Mon Sep 17 00:00:00 2001
From: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Date: Wed, 18 Apr 2018 14:11:43 -0400
Subject: [PATCH 4458/5725] drm/amd/display: add fixed point fractional bit
truncation function
Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
---
drivers/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 ebfd33e..61f11e2 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
--
2.7.4
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