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

[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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
View File

@ -231,18 +231,21 @@ void amdgpu_dm_set_ctm(struct dm_crtc_state *crtc)
* preparation for hardware commit. If no lut is specified by user, we default
* to SRGB degamma.
*
* Currently, we only support degamma bypass, or preprogrammed SRGB degamma.
* Programmable degamma is not supported, and an attempt to do so will return
* -EINVAL.
* We support degamma bypass, predefined SRGB, and custom degamma
*
* RETURNS:
* 0 on success, -EINVAL if custom degamma curve is given.
* 0 on success
* -EINVAL if crtc_state has a degamma_lut of invalid size
* -ENOMEM if gamma allocation fails
*/
int amdgpu_dm_set_degamma_lut(struct drm_crtc_state *crtc_state,
struct dc_plane_state *dc_plane_state)
{
struct drm_property_blob *blob = crtc_state->degamma_lut;
struct drm_color_lut *lut;
uint32_t lut_size;
struct dc_gamma *gamma;
bool ret;
if (!blob) {
/* Default to SRGB */
@ -258,11 +261,30 @@ int amdgpu_dm_set_degamma_lut(struct drm_crtc_state *crtc_state,
return 0;
}
/* Otherwise, assume SRGB, since programmable degamma is not
* supported.
*/
dc_plane_state->in_transfer_func->type = TF_TYPE_PREDEFINED;
dc_plane_state->in_transfer_func->tf = TRANSFER_FUNCTION_SRGB;
return -EINVAL;
gamma = dc_create_gamma();
if (!gamma)
return -ENOMEM;
lut_size = blob->length / sizeof(struct drm_color_lut);
gamma->num_entries = lut_size;
if (gamma->num_entries == MAX_COLOR_LUT_ENTRIES)
gamma->type = GAMMA_CUSTOM;
else {
dc_gamma_release(&gamma);
return -EINVAL;
}
__drm_lut_to_dc_gamma(lut, gamma, false);
dc_plane_state->in_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
ret = mod_color_calculate_degamma_params(dc_plane_state->in_transfer_func, gamma, true);
dc_gamma_release(&gamma);
if (!ret) {
dc_plane_state->in_transfer_func->type = TF_TYPE_BYPASS;
DRM_ERROR("Out of memory when calculating degamma params\n");
return -ENOMEM;
}
return 0;
}

2
drivers/gpu/drm/amd/display/dc/dc_hw_types.h
View File

@ -417,6 +417,7 @@ enum {
GAMMA_RGB_256_ENTRIES = 256,
GAMMA_RGB_FLOAT_1024_ENTRIES = 1024,
GAMMA_CS_TFM_1D_ENTRIES = 4096,
GAMMA_CUSTOM_ENTRIES = 4096,
GAMMA_MAX_ENTRIES = 4096
};
@ -424,6 +425,7 @@ enum dc_gamma_type {
GAMMA_RGB_256 = 1,
GAMMA_RGB_FLOAT_1024 = 2,
GAMMA_CS_TFM_1D = 3,
GAMMA_CUSTOM = 4,
};
struct dc_csc_transform {

7
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
View File

@ -1213,8 +1213,11 @@ static bool dcn10_set_input_transfer_func(struct pipe_ctx *pipe_ctx,
} else if (tf->type == TF_TYPE_BYPASS) {
dpp_base->funcs->dpp_set_degamma(dpp_base, IPP_DEGAMMA_MODE_BYPASS);
} else {
/*TF_TYPE_DISTRIBUTED_POINTS*/
result = false;
cm_helper_translate_curve_to_degamma_hw_format(tf,
&dpp_base->degamma_params);
dpp_base->funcs->dpp_program_degamma_pwl(dpp_base,
&dpp_base->degamma_params);
result = true;
}
return result;

10
drivers/gpu/drm/amd/display/modules/color/color_gamma.c
View File

@ -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;