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| author | Ken Chalmers | 2018-01-17 20:17:40 +0100 |
|---|---|---|
| committer | Alex Deucher | 2018-02-19 20:19:29 +0100 |
| commit | a6e59fa8061b222283c27cafb134fb8f862f0d7c (patch) | |
| tree | 6df2da947b5d954158cfc0bd6135e99dfaf9ec7e /drivers/gpu/drm/amd/display/dc/basics | |
| parent | drm/amd/display: remove unused function prototypes (diff) | |
| download | kernel-qcow2-linux-a6e59fa8061b222283c27cafb134fb8f862f0d7c.tar.gz kernel-qcow2-linux-a6e59fa8061b222283c27cafb134fb8f862f0d7c.tar.xz kernel-qcow2-linux-a6e59fa8061b222283c27cafb134fb8f862f0d7c.zip | |
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 <ken.chalmers@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/basics')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c | 9 |
1 files changed, 9 insertions, 0 deletions
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); +} |