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Commit ab9c2062 authored by Dmytro Laktyushkin's avatar Dmytro Laktyushkin Committed by Alex Deucher
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drm/amd/display: add fixed point fractional bit truncation function 



Signed-off-by: default avatarDmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Reviewed-by: default avatarTony Cheng <Tony.Cheng@amd.com>
Acked-by: default avatarHarry Wentland <harry.wentland@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent e8838df1

drivers/gpu/drm/amd/display/include/fixed31_32.h

+17 −0
Original line number Diff line number Diff line
@@ -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