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drm/amd/display: fix regamma build optimization

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[Why]
When the global variable pow_buffer_ptr is set to -1, by definition
optimizations should not be used to build the regamma. Since
translate_from_linear_space unconditionally increments this global, it
inadvertently enables the optimization.

[How]
Increment pow_buffer_ptr only if it is not -1.

Signed-off-by: Josip Pavic <Josip.Pavic@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Josip Pavic 2019-11-26 12:26:14 -05:00 committed by Alex Deucher
parent 8d5bc3a5b8
commit d87dedb1ec
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/amd/display/modules/color/color_gamma.c
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@ -364,8 +364,10 @@ static struct fixed31_32 translate_from_linear_space(
scratch_2 = dc_fixpt_mul(gamma_of_2,
pow_buffer[pow_buffer_ptr%16]);
pow_buffer[pow_buffer_ptr%16] = scratch_2;
pow_buffer_ptr++;
if (pow_buffer_ptr != -1) {
pow_buffer[pow_buffer_ptr%16] = scratch_2;
pow_buffer_ptr++;
}
scratch_1 = dc_fixpt_mul(scratch_1, scratch_2);
scratch_1 = dc_fixpt_sub(scratch_1, args->a2);