--- /dev/null
+/*
+ * Copyright 2018 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+#include "amdgpu_mode.h"
+#include "amdgpu_dm.h"
+#include "modules/color/color_gamma.h"
+
+
+#define MAX_LUT_ENTRIES 256
+
+/*
+ * Return true if the given lut is a linear mapping of values, i.e. it acts
+ * like a bypass LUT.
+ *
+ * It is considered linear if the lut represents:
+ * f(a) = (0xFF00/MAX_LUT_ENTRIES-1)a; for integer a in [0, MAX_LUT_ENTRIES)
+ */
+static bool __is_lut_linear(struct drm_color_lut *lut)
+{
+ int i;
+ uint32_t max_os = 0xFF00;
+ uint32_t expected;
+ int delta;
+
+ for (i = 0; i < MAX_LUT_ENTRIES; i++) {
+ /* All color values should equal */
+ if ((lut[i].red != lut[i].green) || (lut[i].green != lut[i].blue))
+ return false;
+
+ expected = i * max_os / (MAX_LUT_ENTRIES-1);
+
+ /* Allow a +/-1 error. */
+ delta = lut[i].red - expected;
+ if (delta < -1 || 1 < delta)
+ return false;
+ }
+ return true;
+}
+
+/**
+ * amdgpu_dm_set_regamma_lut: Set regamma lut for the given CRTC.
+ * @crtc: amdgpu_dm crtc state
+ *
+ * Update the underlying dc_stream_state's output transfer function (OTF) in
+ * preparation for hardware commit. If no lut is specified by user, we default
+ * to SRGB.
+ *
+ * RETURNS:
+ * 0 on success, -ENOMEM if memory cannot be allocated to calculate the OTF.
+ */
+int amdgpu_dm_set_regamma_lut(struct dm_crtc_state *crtc)
+{
+ struct drm_property_blob *blob = crtc->base.gamma_lut;
+ struct dc_stream_state *stream = crtc->stream;
+ struct drm_color_lut *lut;
+ struct dc_gamma *gamma;
+ enum dc_transfer_func_type old_type = stream->out_transfer_func->type;
+
+ uint32_t r, g, b;
+ int i;
+ bool ret;
+
+ if (!blob) {
+ /* By default, use the SRGB predefined curve.*/
+ stream->out_transfer_func->type = TF_TYPE_PREDEFINED;
+ stream->out_transfer_func->tf = TRANSFER_FUNCTION_SRGB;
+ return 0;
+ }
+
+ lut = (struct drm_color_lut *)blob->data;
+
+ if (__is_lut_linear(lut)) {
+ /* Set to bypass if lut is set to linear */
+ stream->out_transfer_func->type = TF_TYPE_BYPASS;
+ stream->out_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
+ return 0;
+ }
+
+ gamma = dc_create_gamma();
+ if (!gamma)
+ return -ENOMEM;
+
+ gamma->num_entries = MAX_LUT_ENTRIES;
+ gamma->type = GAMMA_RGB_256;
+
+ /* Truncate, and store in dc_gamma for output tf calculation */
+ for (i = 0; i < gamma->num_entries; i++) {
+ r = drm_color_lut_extract(lut[i].red, 16);
+ g = drm_color_lut_extract(lut[i].green, 16);
+ b = drm_color_lut_extract(lut[i].blue, 16);
+
+ gamma->entries.red[i] = dal_fixed31_32_from_int(r);
+ gamma->entries.green[i] = dal_fixed31_32_from_int(g);
+ gamma->entries.blue[i] = dal_fixed31_32_from_int(b);
+ }
+
+ /* Call color module to translate into something DC understands. Namely
+ * a transfer function.
+ */
+ stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
+ ret = mod_color_calculate_regamma_params(stream->out_transfer_func,
+ gamma, true);
+ dc_gamma_release(&gamma);
+ if (!ret) {
+ stream->out_transfer_func->type = old_type;
+ DRM_ERROR("Out of memory when calculating regamma params\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+/**
+ * amdgpu_dm_set_ctm: Set the color transform matrix for the given CRTC.
+ * @crtc: amdgpu_dm crtc state
+ *
+ * Update the underlying dc_stream_state's gamut remap matrix in preparation
+ * for hardware commit. If no matrix is specified by user, gamut remap will be
+ * disabled.
+ */
+void amdgpu_dm_set_ctm(struct dm_crtc_state *crtc)
+{
+
+ struct drm_property_blob *blob = crtc->base.ctm;
+ struct dc_stream_state *stream = crtc->stream;
+ struct drm_color_ctm *ctm;
+ int i;
+
+ if (!blob) {
+ stream->gamut_remap_matrix.enable_remap = false;
+ return;
+ }
+
+ stream->gamut_remap_matrix.enable_remap = true;
+ ctm = (struct drm_color_ctm *)blob->data;
+ /*
+ * DRM gives a 3x3 matrix, but DC wants 3x4. Assuming we're operating
+ * with homogeneous coordinates, augment the matrix with 0's.
+ *
+ * The format provided is S31.32, which is the same as our fixed31_32.
+ */
+ for (i = 0; i < 12; i++) {
+ /* Skip 4th element */
+ if (i % 4 == 3) {
+ stream->gamut_remap_matrix.matrix[i] = dal_fixed31_32_zero;
+ continue;
+ }
+ /* csc[i] = ctm[i - floor(i/4)] */
+ stream->gamut_remap_matrix.matrix[i].value = ctm->matrix[i - (i/4)];
+ }
+}
+
+
+/**
+ * amdgpu_dm_set_degamma_lut: Set degamma lut for the given CRTC.
+ * @crtc: amdgpu_dm crtc state
+ *
+ * Update the underlying dc_stream_state's input transfer function (ITF) in
+ * 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.
+ *
+ * RETURNS:
+ * 0 on success, -EINVAL if custom degamma curve is given.
+ */
+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;
+
+ if (!blob) {
+ /* Default to SRGB */
+ dc_plane_state->in_transfer_func->type = TF_TYPE_PREDEFINED;
+ dc_plane_state->in_transfer_func->tf = TRANSFER_FUNCTION_SRGB;
+ return 0;
+ }
+
+ lut = (struct drm_color_lut *)blob->data;
+ if (__is_lut_linear(lut)) {
+ dc_plane_state->in_transfer_func->type = TF_TYPE_BYPASS;
+ dc_plane_state->in_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
+ 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;
+}
+
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