From a6e59fa8061b222283c27cafb134fb8f862f0d7c Mon Sep 17 00:00:00 2001 From: Ken Chalmers Date: Wed, 17 Jan 2018 14:17:40 -0500 Subject: drm/amd/display: WBSCL filter init calculation fixes * Previous code did some calculations with a mix of normal integers and integers aligned as U2.24 fixed-point values. * There were bugs in the conversion of the final result into the S4.19 values required for the registers. Signed-off-by: Ken Chalmers Reviewed-by: Tony Cheng Acked-by: Harry Wentland Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c') diff --git a/drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c b/drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c index 011a97f82fb6..8a9bba879207 100644 --- a/drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c +++ b/drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c @@ -593,3 +593,12 @@ uint32_t dal_fixed31_32_clamp_u0d10( { return clamp_ux_dy(arg.value, 0, 10, 1); } + +int32_t dal_fixed31_32_s4d19( + struct fixed31_32 arg) +{ + if (arg.value < 0) + return -(int32_t)ux_dy(dal_fixed31_32_abs(arg).value, 4, 19); + else + return ux_dy(arg.value, 4, 19); +} -- cgit v1.2.3