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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>
This commit is contained in:
Ken Chalmers 2018-01-17 14:17:40 -05:00 committed by Alex Deucher
parent f774b33982
commit a6e59fa806
2 changed files with 12 additions and 0 deletions
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9
drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c
View File

@ -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);
}

3
drivers/gpu/drm/amd/display/include/fixed31_32.h
View File

@ -470,4 +470,7 @@ uint32_t dal_fixed31_32_clamp_u0d14(
uint32_t dal_fixed31_32_clamp_u0d10(
struct fixed31_32 arg);
int32_t dal_fixed31_32_s4d19(
struct fixed31_32 arg);
#endif