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| author | Aidan Yang <Aidan.Yang@amd.com> | 2019-09-25 16:57:37 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2019-10-25 16:50:07 -0400 |
| commit | 6ac48490baec36aa58f246145d9671a916011c4e (patch) | |
| tree | 27d47a8db631947ecb65ac9d95930b4d4d530e65 /drivers/gpu/drm/amd/display/modules | |
| parent | 6f29c3588b41fab68aa807ff06da79c79b5bcdf7 (diff) | |
| download | linux-6ac48490baec36aa58f246145d9671a916011c4e.tar.bz2 | |
drm/amd/display: Don't use optimized gamma22 with eetf
[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>
Diffstat (limited to 'drivers/gpu/drm/amd/display/modules')
| -rw-r--r-- | drivers/gpu/drm/amd/display/modules/color/color_gamma.c | 45 |
1 files changed, 41 insertions, 4 deletions
diff --git a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c index 2d8f14b69117..85dad356c9d5 100644 --- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c +++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c @@ -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; } - - |