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drm/amd/display: Implement custom degamma lut on dcn

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[Why]
Custom degamma lut functions are a feature we would
like to support on compatible hardware

[How]
In atomic check, convert from array of drm_color_lut to
dc_transfer_func.  On hardware commit, allow for possibility
of custom degamma.  Both are based on the equivalent
regamma pipeline.

Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
David Francis
2018-07-12 15:46:41 -04:00
committed by Alex Deucher
parent d90e9a3bf5
commit 78e4405cec
4 changed files with 46 additions and 15 deletions
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10
drivers/gpu/drm/amd/display/modules/color/color_gamma.c
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@@ -997,7 +997,9 @@ static void scale_user_regamma_ramp(struct pwl_float_data *pwl_rgb,
* norm_y = 4095*regamma_y, and index is just truncating to nearest integer
* lut1 = lut1D[index], lut2 = lut1D[index+1]
*
*adjustedY is then linearly interpolating regamma Y between lut1 and lut2
* adjustedY is then linearly interpolating regamma Y between lut1 and lut2
*
* Custom degamma on Linux uses the same interpolation math, so is handled here
*/
static void apply_lut_1d(
const struct dc_gamma *ramp,
@@ -1018,7 +1020,7 @@ static void apply_lut_1d(
struct fixed31_32 delta_lut;
struct fixed31_32 delta_index;
if (ramp->type != GAMMA_CS_TFM_1D)
if (ramp->type != GAMMA_CS_TFM_1D && ramp->type != GAMMA_CUSTOM)
return; // this is not expected
for (i = 0; i < num_hw_points; i++) {
@@ -1636,7 +1638,9 @@ bool mod_color_calculate_degamma_params(struct dc_transfer_func *input_tf,
map_regamma_hw_to_x_user(ramp, coeff, rgb_user,
coordinates_x, axix_x, curve,
MAX_HW_POINTS, tf_pts,
mapUserRamp);
mapUserRamp && ramp->type != GAMMA_CUSTOM);
if (ramp->type == GAMMA_CUSTOM)
apply_lut_1d(ramp, MAX_HW_POINTS, tf_pts);
ret = true;