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drm/amd/display: Don't use optimized gamma22 with eetf

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[why]
Optimized gamma22 assumes fixed point distribution which is not true
for eetf true.

[how]
Use long calculation for eetf.

Signed-off-by: Aidan Yang <Aidan.Yang@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Acked-by: Reza Amini <Reza.Amini@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Aidan Yang 2019-09-25 16:57:37 -04:00 committed by Alex Deucher
parent 6f29c3588b
commit 6ac48490ba
1 changed files with 41 additions and 4 deletions
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45
drivers/gpu/drm/amd/display/modules/color/color_gamma.c
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@ -373,7 +373,42 @@ static struct fixed31_32 translate_from_linear_space(
return dc_fixpt_mul(args->arg, args->a1);
}
static struct fixed31_32 calculate_gamma22(struct fixed31_32 arg)
static struct fixed31_32 translate_from_linear_space_long(
struct translate_from_linear_space_args *args)
{
const struct fixed31_32 one = dc_fixpt_from_int(1);
if (dc_fixpt_lt(one, args->arg))
return one;
if (dc_fixpt_le(args->arg, dc_fixpt_neg(args->a0)))
return dc_fixpt_sub(
args->a2,
dc_fixpt_mul(
dc_fixpt_add(
one,
args->a3),
dc_fixpt_pow(
dc_fixpt_neg(args->arg),
dc_fixpt_recip(args->gamma))));
else if (dc_fixpt_le(args->a0, args->arg))
return dc_fixpt_sub(
dc_fixpt_mul(
dc_fixpt_add(
one,
args->a3),
dc_fixpt_pow(
args->arg,
dc_fixpt_recip(args->gamma))),
args->a2);
else
return dc_fixpt_mul(
args->arg,
args->a1);
}
static struct fixed31_32 calculate_gamma22(struct fixed31_32 arg, bool use_eetf)
{
struct fixed31_32 gamma = dc_fixpt_from_fraction(22, 10);
@ -384,9 +419,13 @@ static struct fixed31_32 calculate_gamma22(struct fixed31_32 arg)
scratch_gamma_args.a3 = dc_fixpt_zero;
scratch_gamma_args.gamma = gamma;
if (use_eetf)
return translate_from_linear_space_long(&scratch_gamma_args);
return translate_from_linear_space(&scratch_gamma_args);
}
static struct fixed31_32 translate_to_linear_space(
struct fixed31_32 arg,
struct fixed31_32 a0,
@ -950,7 +989,7 @@ static bool build_freesync_hdr(struct pwl_float_data_ex *rgb_regamma,
if (dc_fixpt_lt(scaledX, dc_fixpt_zero))
output = dc_fixpt_zero;
else
output = calculate_gamma22(scaledX);
output = calculate_gamma22(scaledX, use_eetf);
rgb->r = output;
rgb->g = output;
@ -2173,5 +2212,3 @@ bool mod_color_calculate_degamma_curve(enum dc_transfer_func_predefined trans,
rgb_degamma_alloc_fail:
return ret;
}