1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/drivers/video/omap2/dss/dispc_coefs.c
4 *
5 * Copyright (C) 2011 Texas Instruments
6 * Author: Chandrabhanu Mahapatra <cmahapatra@ti.com>
7 */
8
9 #include <linux/kernel.h>
10 #include <video/omapfb_dss.h>
11
12 #include "dispc.h"
13
14 static const struct dispc_coef coef3_M8[8] = {
15 { 0, 0, 128, 0, 0 },
16 { 0, -4, 123, 9, 0 },
17 { 0, -4, 108, 24, 0 },
18 { 0, -2, 87, 43, 0 },
19 { 0, 64, 64, 0, 0 },
20 { 0, 43, 87, -2, 0 },
21 { 0, 24, 108, -4, 0 },
22 { 0, 9, 123, -4, 0 },
23 };
24
25 static const struct dispc_coef coef3_M9[8] = {
26 { 0, 6, 116, 6, 0 },
27 { 0, 0, 112, 16, 0 },
28 { 0, -2, 100, 30, 0 },
29 { 0, -2, 83, 47, 0 },
30 { 0, 64, 64, 0, 0 },
31 { 0, 47, 83, -2, 0 },
32 { 0, 30, 100, -2, 0 },
33 { 0, 16, 112, 0, 0 },
34 };
35
36 static const struct dispc_coef coef3_M10[8] = {
37 { 0, 10, 108, 10, 0 },
38 { 0, 3, 104, 21, 0 },
39 { 0, 0, 94, 34, 0 },
40 { 0, -1, 80, 49, 0 },
41 { 0, 64, 64, 0, 0 },
42 { 0, 49, 80, -1, 0 },
43 { 0, 34, 94, 0, 0 },
44 { 0, 21, 104, 3, 0 },
45 };
46
47 static const struct dispc_coef coef3_M11[8] = {
48 { 0, 14, 100, 14, 0 },
49 { 0, 6, 98, 24, 0 },
50 { 0, 2, 90, 36, 0 },
51 { 0, 0, 78, 50, 0 },
52 { 0, 64, 64, 0, 0 },
53 { 0, 50, 78, 0, 0 },
54 { 0, 36, 90, 2, 0 },
55 { 0, 24, 98, 6, 0 },
56 };
57
58 static const struct dispc_coef coef3_M12[8] = {
59 { 0, 16, 96, 16, 0 },
60 { 0, 9, 93, 26, 0 },
61 { 0, 4, 86, 38, 0 },
62 { 0, 1, 76, 51, 0 },
63 { 0, 64, 64, 0, 0 },
64 { 0, 51, 76, 1, 0 },
65 { 0, 38, 86, 4, 0 },
66 { 0, 26, 93, 9, 0 },
67 };
68
69 static const struct dispc_coef coef3_M13[8] = {
70 { 0, 18, 92, 18, 0 },
71 { 0, 10, 90, 28, 0 },
72 { 0, 5, 83, 40, 0 },
73 { 0, 1, 75, 52, 0 },
74 { 0, 64, 64, 0, 0 },
75 { 0, 52, 75, 1, 0 },
76 { 0, 40, 83, 5, 0 },
77 { 0, 28, 90, 10, 0 },
78 };
79
80 static const struct dispc_coef coef3_M14[8] = {
81 { 0, 20, 88, 20, 0 },
82 { 0, 12, 86, 30, 0 },
83 { 0, 6, 81, 41, 0 },
84 { 0, 2, 74, 52, 0 },
85 { 0, 64, 64, 0, 0 },
86 { 0, 52, 74, 2, 0 },
87 { 0, 41, 81, 6, 0 },
88 { 0, 30, 86, 12, 0 },
89 };
90
91 static const struct dispc_coef coef3_M16[8] = {
92 { 0, 22, 84, 22, 0 },
93 { 0, 14, 82, 32, 0 },
94 { 0, 8, 78, 42, 0 },
95 { 0, 3, 72, 53, 0 },
96 { 0, 64, 64, 0, 0 },
97 { 0, 53, 72, 3, 0 },
98 { 0, 42, 78, 8, 0 },
99 { 0, 32, 82, 14, 0 },
100 };
101
102 static const struct dispc_coef coef3_M19[8] = {
103 { 0, 24, 80, 24, 0 },
104 { 0, 16, 79, 33, 0 },
105 { 0, 9, 76, 43, 0 },
106 { 0, 4, 70, 54, 0 },
107 { 0, 64, 64, 0, 0 },
108 { 0, 54, 70, 4, 0 },
109 { 0, 43, 76, 9, 0 },
110 { 0, 33, 79, 16, 0 },
111 };
112
113 static const struct dispc_coef coef3_M22[8] = {
114 { 0, 25, 78, 25, 0 },
115 { 0, 17, 77, 34, 0 },
116 { 0, 10, 74, 44, 0 },
117 { 0, 5, 69, 54, 0 },
118 { 0, 64, 64, 0, 0 },
119 { 0, 54, 69, 5, 0 },
120 { 0, 44, 74, 10, 0 },
121 { 0, 34, 77, 17, 0 },
122 };
123
124 static const struct dispc_coef coef3_M26[8] = {
125 { 0, 26, 76, 26, 0 },
126 { 0, 19, 74, 35, 0 },
127 { 0, 11, 72, 45, 0 },
128 { 0, 5, 69, 54, 0 },
129 { 0, 64, 64, 0, 0 },
130 { 0, 54, 69, 5, 0 },
131 { 0, 45, 72, 11, 0 },
132 { 0, 35, 74, 19, 0 },
133 };
134
135 static const struct dispc_coef coef3_M32[8] = {
136 { 0, 27, 74, 27, 0 },
137 { 0, 19, 73, 36, 0 },
138 { 0, 12, 71, 45, 0 },
139 { 0, 6, 68, 54, 0 },
140 { 0, 64, 64, 0, 0 },
141 { 0, 54, 68, 6, 0 },
142 { 0, 45, 71, 12, 0 },
143 { 0, 36, 73, 19, 0 },
144 };
145
146 static const struct dispc_coef coef5_M8[8] = {
147 { 0, 0, 128, 0, 0 },
148 { -2, 14, 125, -10, 1 },
149 { -6, 33, 114, -15, 2 },
150 { -10, 55, 98, -16, 1 },
151 { 0, -14, 78, 78, -14 },
152 { 1, -16, 98, 55, -10 },
153 { 2, -15, 114, 33, -6 },
154 { 1, -10, 125, 14, -2 },
155 };
156
157 static const struct dispc_coef coef5_M9[8] = {
158 { -3, 10, 114, 10, -3 },
159 { -6, 24, 111, 0, -1 },
160 { -8, 40, 103, -7, 0 },
161 { -11, 58, 91, -11, 1 },
162 { 0, -12, 76, 76, -12 },
163 { 1, -11, 91, 58, -11 },
164 { 0, -7, 103, 40, -8 },
165 { -1, 0, 111, 24, -6 },
166 };
167
168 static const struct dispc_coef coef5_M10[8] = {
169 { -4, 18, 100, 18, -4 },
170 { -6, 30, 99, 8, -3 },
171 { -8, 44, 93, 0, -1 },
172 { -9, 58, 84, -5, 0 },
173 { 0, -8, 72, 72, -8 },
174 { 0, -5, 84, 58, -9 },
175 { -1, 0, 93, 44, -8 },
176 { -3, 8, 99, 30, -6 },
177 };
178
179 static const struct dispc_coef coef5_M11[8] = {
180 { -5, 23, 92, 23, -5 },
181 { -6, 34, 90, 13, -3 },
182 { -6, 45, 85, 6, -2 },
183 { -6, 57, 78, 0, -1 },
184 { 0, -4, 68, 68, -4 },
185 { -1, 0, 78, 57, -6 },
186 { -2, 6, 85, 45, -6 },
187 { -3, 13, 90, 34, -6 },
188 };
189
190 static const struct dispc_coef coef5_M12[8] = {
191 { -4, 26, 84, 26, -4 },
192 { -5, 36, 82, 18, -3 },
193 { -4, 46, 78, 10, -2 },
194 { -3, 55, 72, 5, -1 },
195 { 0, 0, 64, 64, 0 },
196 { -1, 5, 72, 55, -3 },
197 { -2, 10, 78, 46, -4 },
198 { -3, 18, 82, 36, -5 },
199 };
200
201 static const struct dispc_coef coef5_M13[8] = {
202 { -3, 28, 78, 28, -3 },
203 { -3, 37, 76, 21, -3 },
204 { -2, 45, 73, 14, -2 },
205 { 0, 53, 68, 8, -1 },
206 { 0, 3, 61, 61, 3 },
207 { -1, 8, 68, 53, 0 },
208 { -2, 14, 73, 45, -2 },
209 { -3, 21, 76, 37, -3 },
210 };
211
212 static const struct dispc_coef coef5_M14[8] = {
213 { -2, 30, 72, 30, -2 },
214 { -1, 37, 71, 23, -2 },
215 { 0, 45, 69, 16, -2 },
216 { 3, 52, 64, 10, -1 },
217 { 0, 6, 58, 58, 6 },
218 { -1, 10, 64, 52, 3 },
219 { -2, 16, 69, 45, 0 },
220 { -2, 23, 71, 37, -1 },
221 };
222
223 static const struct dispc_coef coef5_M16[8] = {
224 { 0, 31, 66, 31, 0 },
225 { 1, 38, 65, 25, -1 },
226 { 3, 44, 62, 20, -1 },
227 { 6, 49, 59, 14, 0 },
228 { 0, 10, 54, 54, 10 },
229 { 0, 14, 59, 49, 6 },
230 { -1, 20, 62, 44, 3 },
231 { -1, 25, 65, 38, 1 },
232 };
233
234 static const struct dispc_coef coef5_M19[8] = {
235 { 3, 32, 58, 32, 3 },
236 { 4, 38, 58, 27, 1 },
237 { 7, 42, 55, 23, 1 },
238 { 10, 46, 54, 18, 0 },
239 { 0, 14, 50, 50, 14 },
240 { 0, 18, 54, 46, 10 },
241 { 1, 23, 55, 42, 7 },
242 { 1, 27, 58, 38, 4 },
243 };
244
245 static const struct dispc_coef coef5_M22[8] = {
246 { 4, 33, 54, 33, 4 },
247 { 6, 37, 54, 28, 3 },
248 { 9, 41, 53, 24, 1 },
249 { 12, 45, 51, 20, 0 },
250 { 0, 16, 48, 48, 16 },
251 { 0, 20, 51, 45, 12 },
252 { 1, 24, 53, 41, 9 },
253 { 3, 28, 54, 37, 6 },
254 };
255
256 static const struct dispc_coef coef5_M26[8] = {
257 { 6, 33, 50, 33, 6 },
258 { 8, 36, 51, 29, 4 },
259 { 11, 40, 50, 25, 2 },
260 { 14, 43, 48, 22, 1 },
261 { 0, 18, 46, 46, 18 },
262 { 1, 22, 48, 43, 14 },
263 { 2, 25, 50, 40, 11 },
264 { 4, 29, 51, 36, 8 },
265 };
266
267 static const struct dispc_coef coef5_M32[8] = {
268 { 7, 33, 48, 33, 7 },
269 { 10, 36, 48, 29, 5 },
270 { 13, 39, 47, 26, 3 },
271 { 16, 42, 46, 23, 1 },
272 { 0, 19, 45, 45, 19 },
273 { 1, 23, 46, 42, 16 },
274 { 3, 26, 47, 39, 13 },
275 { 5, 29, 48, 36, 10 },
276 };
277
dispc_ovl_get_scale_coef(int inc,int five_taps)278 const struct dispc_coef *dispc_ovl_get_scale_coef(int inc, int five_taps)
279 {
280 int i;
281 static const struct {
282 int Mmin;
283 int Mmax;
284 const struct dispc_coef *coef_3;
285 const struct dispc_coef *coef_5;
286 } coefs[] = {
287 { 27, 32, coef3_M32, coef5_M32 },
288 { 23, 26, coef3_M26, coef5_M26 },
289 { 20, 22, coef3_M22, coef5_M22 },
290 { 17, 19, coef3_M19, coef5_M19 },
291 { 15, 16, coef3_M16, coef5_M16 },
292 { 14, 14, coef3_M14, coef5_M14 },
293 { 13, 13, coef3_M13, coef5_M13 },
294 { 12, 12, coef3_M12, coef5_M12 },
295 { 11, 11, coef3_M11, coef5_M11 },
296 { 10, 10, coef3_M10, coef5_M10 },
297 { 9, 9, coef3_M9, coef5_M9 },
298 { 4, 8, coef3_M8, coef5_M8 },
299 /*
300 * When upscaling more than two times, blockiness and outlines
301 * around the image are observed when M8 tables are used. M11,
302 * M16 and M19 tables are used to prevent this.
303 */
304 { 3, 3, coef3_M11, coef5_M11 },
305 { 2, 2, coef3_M16, coef5_M16 },
306 { 0, 1, coef3_M19, coef5_M19 },
307 };
308
309 inc /= 128;
310 for (i = 0; i < ARRAY_SIZE(coefs); ++i)
311 if (inc >= coefs[i].Mmin && inc <= coefs[i].Mmax)
312 return five_taps ? coefs[i].coef_5 : coefs[i].coef_3;
313 return NULL;
314 }
315