1 /*
2 * Copyright 2018 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: AMD
23 *
24 */
25
26 #include "amdgpu_mode.h"
27 #include "amdgpu_dm.h"
28 #include "dc.h"
29 #include "modules/color/color_gamma.h"
30
31 #define MAX_DRM_LUT_VALUE 0xFFFF
32
33 /*
34 * Initialize the color module.
35 *
36 * We're not using the full color module, only certain components.
37 * Only call setup functions for components that we need.
38 */
amdgpu_dm_init_color_mod(void)39 void amdgpu_dm_init_color_mod(void)
40 {
41 setup_x_points_distribution();
42 }
43
44
45 /*
46 * Return true if the given lut is a linear mapping of values, i.e. it acts
47 * like a bypass LUT.
48 *
49 * It is considered linear if the lut represents:
50 * f(a) = (0xFF00/MAX_COLOR_LUT_ENTRIES-1)a; for integer a in
51 * [0, MAX_COLOR_LUT_ENTRIES)
52 */
__is_lut_linear(struct drm_color_lut * lut,uint32_t size)53 static bool __is_lut_linear(struct drm_color_lut *lut, uint32_t size)
54 {
55 int i;
56 uint32_t expected;
57 int delta;
58
59 for (i = 0; i < size; i++) {
60 /* All color values should equal */
61 if ((lut[i].red != lut[i].green) || (lut[i].green != lut[i].blue))
62 return false;
63
64 expected = i * MAX_DRM_LUT_VALUE / (size-1);
65
66 /* Allow a +/-1 error. */
67 delta = lut[i].red - expected;
68 if (delta < -1 || 1 < delta)
69 return false;
70 }
71 return true;
72 }
73
74 /**
75 * Convert the drm_color_lut to dc_gamma. The conversion depends on the size
76 * of the lut - whether or not it's legacy.
77 */
__drm_lut_to_dc_gamma(struct drm_color_lut * lut,struct dc_gamma * gamma,bool is_legacy)78 static void __drm_lut_to_dc_gamma(struct drm_color_lut *lut,
79 struct dc_gamma *gamma,
80 bool is_legacy)
81 {
82 uint32_t r, g, b;
83 int i;
84
85 if (is_legacy) {
86 for (i = 0; i < MAX_COLOR_LEGACY_LUT_ENTRIES; i++) {
87 r = drm_color_lut_extract(lut[i].red, 16);
88 g = drm_color_lut_extract(lut[i].green, 16);
89 b = drm_color_lut_extract(lut[i].blue, 16);
90
91 gamma->entries.red[i] = dc_fixpt_from_int(r);
92 gamma->entries.green[i] = dc_fixpt_from_int(g);
93 gamma->entries.blue[i] = dc_fixpt_from_int(b);
94 }
95 return;
96 }
97
98 /* else */
99 for (i = 0; i < MAX_COLOR_LUT_ENTRIES; i++) {
100 r = drm_color_lut_extract(lut[i].red, 16);
101 g = drm_color_lut_extract(lut[i].green, 16);
102 b = drm_color_lut_extract(lut[i].blue, 16);
103
104 gamma->entries.red[i] = dc_fixpt_from_fraction(r, MAX_DRM_LUT_VALUE);
105 gamma->entries.green[i] = dc_fixpt_from_fraction(g, MAX_DRM_LUT_VALUE);
106 gamma->entries.blue[i] = dc_fixpt_from_fraction(b, MAX_DRM_LUT_VALUE);
107 }
108 }
109
110 /**
111 * amdgpu_dm_set_regamma_lut: Set regamma lut for the given CRTC.
112 * @crtc: amdgpu_dm crtc state
113 *
114 * Update the underlying dc_stream_state's output transfer function (OTF) in
115 * preparation for hardware commit. If no lut is specified by user, we default
116 * to SRGB.
117 *
118 * RETURNS:
119 * 0 on success, -ENOMEM if memory cannot be allocated to calculate the OTF.
120 */
amdgpu_dm_set_regamma_lut(struct dm_crtc_state * crtc)121 int amdgpu_dm_set_regamma_lut(struct dm_crtc_state *crtc)
122 {
123 struct drm_property_blob *blob = crtc->base.gamma_lut;
124 struct dc_stream_state *stream = crtc->stream;
125 struct drm_color_lut *lut;
126 uint32_t lut_size;
127 struct dc_gamma *gamma;
128 enum dc_transfer_func_type old_type = stream->out_transfer_func->type;
129
130 bool ret;
131
132 if (!blob) {
133 /* By default, use the SRGB predefined curve.*/
134 stream->out_transfer_func->type = TF_TYPE_PREDEFINED;
135 stream->out_transfer_func->tf = TRANSFER_FUNCTION_SRGB;
136 return 0;
137 }
138
139 lut = (struct drm_color_lut *)blob->data;
140 lut_size = blob->length / sizeof(struct drm_color_lut);
141
142 gamma = dc_create_gamma();
143 if (!gamma)
144 return -ENOMEM;
145
146 gamma->num_entries = lut_size;
147 if (gamma->num_entries == MAX_COLOR_LEGACY_LUT_ENTRIES)
148 gamma->type = GAMMA_RGB_256;
149 else if (gamma->num_entries == MAX_COLOR_LUT_ENTRIES)
150 gamma->type = GAMMA_CS_TFM_1D;
151 else {
152 /* Invalid lut size */
153 dc_gamma_release(&gamma);
154 return -EINVAL;
155 }
156
157 /* Convert drm_lut into dc_gamma */
158 __drm_lut_to_dc_gamma(lut, gamma, gamma->type == GAMMA_RGB_256);
159
160 /* Call color module to translate into something DC understands. Namely
161 * a transfer function.
162 */
163 stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
164 ret = mod_color_calculate_regamma_params(stream->out_transfer_func,
165 gamma, true);
166 dc_gamma_release(&gamma);
167 if (!ret) {
168 stream->out_transfer_func->type = old_type;
169 DRM_ERROR("Out of memory when calculating regamma params\n");
170 return -ENOMEM;
171 }
172
173 return 0;
174 }
175
176 /**
177 * amdgpu_dm_set_ctm: Set the color transform matrix for the given CRTC.
178 * @crtc: amdgpu_dm crtc state
179 *
180 * Update the underlying dc_stream_state's gamut remap matrix in preparation
181 * for hardware commit. If no matrix is specified by user, gamut remap will be
182 * disabled.
183 */
amdgpu_dm_set_ctm(struct dm_crtc_state * crtc)184 void amdgpu_dm_set_ctm(struct dm_crtc_state *crtc)
185 {
186
187 struct drm_property_blob *blob = crtc->base.ctm;
188 struct dc_stream_state *stream = crtc->stream;
189 struct drm_color_ctm *ctm;
190 int64_t val;
191 int i;
192
193 if (!blob) {
194 stream->gamut_remap_matrix.enable_remap = false;
195 return;
196 }
197
198 stream->gamut_remap_matrix.enable_remap = true;
199 ctm = (struct drm_color_ctm *)blob->data;
200 /*
201 * DRM gives a 3x3 matrix, but DC wants 3x4. Assuming we're operating
202 * with homogeneous coordinates, augment the matrix with 0's.
203 *
204 * The format provided is S31.32, using signed-magnitude representation.
205 * Our fixed31_32 is also S31.32, but is using 2's complement. We have
206 * to convert from signed-magnitude to 2's complement.
207 */
208 for (i = 0; i < 12; i++) {
209 /* Skip 4th element */
210 if (i % 4 == 3) {
211 stream->gamut_remap_matrix.matrix[i] = dc_fixpt_zero;
212 continue;
213 }
214
215 /* gamut_remap_matrix[i] = ctm[i - floor(i/4)] */
216 val = ctm->matrix[i - (i/4)];
217 /* If negative, convert to 2's complement. */
218 if (val & (1ULL << 63))
219 val = -(val & ~(1ULL << 63));
220
221 stream->gamut_remap_matrix.matrix[i].value = val;
222 }
223 }
224
225
226 /**
227 * amdgpu_dm_set_degamma_lut: Set degamma lut for the given CRTC.
228 * @crtc: amdgpu_dm crtc state
229 *
230 * Update the underlying dc_stream_state's input transfer function (ITF) in
231 * preparation for hardware commit. If no lut is specified by user, we default
232 * to SRGB degamma.
233 *
234 * We support degamma bypass, predefined SRGB, and custom degamma
235 *
236 * RETURNS:
237 * 0 on success
238 * -EINVAL if crtc_state has a degamma_lut of invalid size
239 * -ENOMEM if gamma allocation fails
240 */
amdgpu_dm_set_degamma_lut(struct drm_crtc_state * crtc_state,struct dc_plane_state * dc_plane_state)241 int amdgpu_dm_set_degamma_lut(struct drm_crtc_state *crtc_state,
242 struct dc_plane_state *dc_plane_state)
243 {
244 struct drm_property_blob *blob = crtc_state->degamma_lut;
245 struct drm_color_lut *lut;
246 uint32_t lut_size;
247 struct dc_gamma *gamma;
248 bool ret;
249
250 if (!blob) {
251 /* Default to SRGB */
252 dc_plane_state->in_transfer_func->type = TF_TYPE_PREDEFINED;
253 dc_plane_state->in_transfer_func->tf = TRANSFER_FUNCTION_SRGB;
254 return 0;
255 }
256
257 lut = (struct drm_color_lut *)blob->data;
258 if (__is_lut_linear(lut, MAX_COLOR_LUT_ENTRIES)) {
259 dc_plane_state->in_transfer_func->type = TF_TYPE_BYPASS;
260 dc_plane_state->in_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
261 return 0;
262 }
263
264 gamma = dc_create_gamma();
265 if (!gamma)
266 return -ENOMEM;
267
268 lut_size = blob->length / sizeof(struct drm_color_lut);
269 gamma->num_entries = lut_size;
270 if (gamma->num_entries == MAX_COLOR_LUT_ENTRIES)
271 gamma->type = GAMMA_CUSTOM;
272 else {
273 dc_gamma_release(&gamma);
274 return -EINVAL;
275 }
276
277 __drm_lut_to_dc_gamma(lut, gamma, false);
278
279 dc_plane_state->in_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
280 ret = mod_color_calculate_degamma_params(dc_plane_state->in_transfer_func, gamma, true);
281 dc_gamma_release(&gamma);
282 if (!ret) {
283 dc_plane_state->in_transfer_func->type = TF_TYPE_BYPASS;
284 DRM_ERROR("Out of memory when calculating degamma params\n");
285 return -ENOMEM;
286 }
287
288 return 0;
289 }
290
291
