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dispc_coefs.c
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1 /*
2  * linux/drivers/video/omap2/dss/dispc_coefs.c
3  *
4  * Copyright (C) 2011 Texas Instruments
5  * Author: Chandrabhanu Mahapatra <[email protected]>
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License version 2 as published by
9  * the Free Software Foundation.
10  *
11  * This program is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14  * more details.
15  *
16  * You should have received a copy of the GNU General Public License along with
17  * this program. If not, see <http://www.gnu.org/licenses/>.
18  */
19 
20 #include <linux/kernel.h>
21 #include <video/omapdss.h>
22 
23 #include "dispc.h"
24 
25 static const struct dispc_coef coef3_M8[8] = {
26  { 0, 0, 128, 0, 0 },
27  { 0, -4, 123, 9, 0 },
28  { 0, -4, 108, 24, 0 },
29  { 0, -2, 87, 43, 0 },
30  { 0, 64, 64, 0, 0 },
31  { 0, 43, 87, -2, 0 },
32  { 0, 24, 108, -4, 0 },
33  { 0, 9, 123, -4, 0 },
34 };
35 
36 static const struct dispc_coef coef3_M9[8] = {
37  { 0, 6, 116, 6, 0 },
38  { 0, 0, 112, 16, 0 },
39  { 0, -2, 100, 30, 0 },
40  { 0, -2, 83, 47, 0 },
41  { 0, 64, 64, 0, 0 },
42  { 0, 47, 83, -2, 0 },
43  { 0, 30, 100, -2, 0 },
44  { 0, 16, 112, 0, 0 },
45 };
46 
47 static const struct dispc_coef coef3_M10[8] = {
48  { 0, 10, 108, 10, 0 },
49  { 0, 3, 104, 21, 0 },
50  { 0, 0, 94, 34, 0 },
51  { 0, -1, 80, 49, 0 },
52  { 0, 64, 64, 0, 0 },
53  { 0, 49, 80, -1, 0 },
54  { 0, 34, 94, 0, 0 },
55  { 0, 21, 104, 3, 0 },
56 };
57 
58 static const struct dispc_coef coef3_M11[8] = {
59  { 0, 14, 100, 14, 0 },
60  { 0, 6, 98, 24, 0 },
61  { 0, 2, 90, 36, 0 },
62  { 0, 0, 78, 50, 0 },
63  { 0, 64, 64, 0, 0 },
64  { 0, 50, 78, 0, 0 },
65  { 0, 36, 90, 2, 0 },
66  { 0, 24, 98, 6, 0 },
67 };
68 
69 static const struct dispc_coef coef3_M12[8] = {
70  { 0, 16, 96, 16, 0 },
71  { 0, 9, 93, 26, 0 },
72  { 0, 4, 86, 38, 0 },
73  { 0, 1, 76, 51, 0 },
74  { 0, 64, 64, 0, 0 },
75  { 0, 51, 76, 1, 0 },
76  { 0, 38, 86, 4, 0 },
77  { 0, 26, 93, 9, 0 },
78 };
79 
80 static const struct dispc_coef coef3_M13[8] = {
81  { 0, 18, 92, 18, 0 },
82  { 0, 10, 90, 28, 0 },
83  { 0, 5, 83, 40, 0 },
84  { 0, 1, 75, 52, 0 },
85  { 0, 64, 64, 0, 0 },
86  { 0, 52, 75, 1, 0 },
87  { 0, 40, 83, 5, 0 },
88  { 0, 28, 90, 10, 0 },
89 };
90 
91 static const struct dispc_coef coef3_M14[8] = {
92  { 0, 20, 88, 20, 0 },
93  { 0, 12, 86, 30, 0 },
94  { 0, 6, 81, 41, 0 },
95  { 0, 2, 74, 52, 0 },
96  { 0, 64, 64, 0, 0 },
97  { 0, 52, 74, 2, 0 },
98  { 0, 41, 81, 6, 0 },
99  { 0, 30, 86, 12, 0 },
100 };
101 
102 static const struct dispc_coef coef3_M16[8] = {
103  { 0, 22, 84, 22, 0 },
104  { 0, 14, 82, 32, 0 },
105  { 0, 8, 78, 42, 0 },
106  { 0, 3, 72, 53, 0 },
107  { 0, 64, 64, 0, 0 },
108  { 0, 53, 72, 3, 0 },
109  { 0, 42, 78, 8, 0 },
110  { 0, 32, 82, 14, 0 },
111 };
112 
113 static const struct dispc_coef coef3_M19[8] = {
114  { 0, 24, 80, 24, 0 },
115  { 0, 16, 79, 33, 0 },
116  { 0, 9, 76, 43, 0 },
117  { 0, 4, 70, 54, 0 },
118  { 0, 64, 64, 0, 0 },
119  { 0, 54, 70, 4, 0 },
120  { 0, 43, 76, 9, 0 },
121  { 0, 33, 79, 16, 0 },
122 };
123 
124 static const struct dispc_coef coef3_M22[8] = {
125  { 0, 25, 78, 25, 0 },
126  { 0, 17, 77, 34, 0 },
127  { 0, 10, 74, 44, 0 },
128  { 0, 5, 69, 54, 0 },
129  { 0, 64, 64, 0, 0 },
130  { 0, 54, 69, 5, 0 },
131  { 0, 44, 74, 10, 0 },
132  { 0, 34, 77, 17, 0 },
133 };
134 
135 static const struct dispc_coef coef3_M26[8] = {
136  { 0, 26, 76, 26, 0 },
137  { 0, 19, 74, 35, 0 },
138  { 0, 11, 72, 45, 0 },
139  { 0, 5, 69, 54, 0 },
140  { 0, 64, 64, 0, 0 },
141  { 0, 54, 69, 5, 0 },
142  { 0, 45, 72, 11, 0 },
143  { 0, 35, 74, 19, 0 },
144 };
145 
146 static const struct dispc_coef coef3_M32[8] = {
147  { 0, 27, 74, 27, 0 },
148  { 0, 19, 73, 36, 0 },
149  { 0, 12, 71, 45, 0 },
150  { 0, 6, 68, 54, 0 },
151  { 0, 64, 64, 0, 0 },
152  { 0, 54, 68, 6, 0 },
153  { 0, 45, 71, 12, 0 },
154  { 0, 36, 73, 19, 0 },
155 };
156 
157 static const struct dispc_coef coef5_M8[8] = {
158  { 0, 0, 128, 0, 0 },
159  { -2, 14, 125, -10, 1 },
160  { -6, 33, 114, -15, 2 },
161  { -10, 55, 98, -16, 1 },
162  { 0, -14, 78, 78, -14 },
163  { 1, -16, 98, 55, -10 },
164  { 2, -15, 114, 33, -6 },
165  { 1, -10, 125, 14, -2 },
166 };
167 
168 static const struct dispc_coef coef5_M9[8] = {
169  { -3, 10, 114, 10, -3 },
170  { -6, 24, 111, 0, -1 },
171  { -8, 40, 103, -7, 0 },
172  { -11, 58, 91, -11, 1 },
173  { 0, -12, 76, 76, -12 },
174  { 1, -11, 91, 58, -11 },
175  { 0, -7, 103, 40, -8 },
176  { -1, 0, 111, 24, -6 },
177 };
178 
179 static const struct dispc_coef coef5_M10[8] = {
180  { -4, 18, 100, 18, -4 },
181  { -6, 30, 99, 8, -3 },
182  { -8, 44, 93, 0, -1 },
183  { -9, 58, 84, -5, 0 },
184  { 0, -8, 72, 72, -8 },
185  { 0, -5, 84, 58, -9 },
186  { -1, 0, 93, 44, -8 },
187  { -3, 8, 99, 30, -6 },
188 };
189 
190 static const struct dispc_coef coef5_M11[8] = {
191  { -5, 23, 92, 23, -5 },
192  { -6, 34, 90, 13, -3 },
193  { -6, 45, 85, 6, -2 },
194  { -6, 57, 78, 0, -1 },
195  { 0, -4, 68, 68, -4 },
196  { -1, 0, 78, 57, -6 },
197  { -2, 6, 85, 45, -6 },
198  { -3, 13, 90, 34, -6 },
199 };
200 
201 static const struct dispc_coef coef5_M12[8] = {
202  { -4, 26, 84, 26, -4 },
203  { -5, 36, 82, 18, -3 },
204  { -4, 46, 78, 10, -2 },
205  { -3, 55, 72, 5, -1 },
206  { 0, 0, 64, 64, 0 },
207  { -1, 5, 72, 55, -3 },
208  { -2, 10, 78, 46, -4 },
209  { -3, 18, 82, 36, -5 },
210 };
211 
212 static const struct dispc_coef coef5_M13[8] = {
213  { -3, 28, 78, 28, -3 },
214  { -3, 37, 76, 21, -3 },
215  { -2, 45, 73, 14, -2 },
216  { 0, 53, 68, 8, -1 },
217  { 0, 3, 61, 61, 3 },
218  { -1, 8, 68, 53, 0 },
219  { -2, 14, 73, 45, -2 },
220  { -3, 21, 76, 37, -3 },
221 };
222 
223 static const struct dispc_coef coef5_M14[8] = {
224  { -2, 30, 72, 30, -2 },
225  { -1, 37, 71, 23, -2 },
226  { 0, 45, 69, 16, -2 },
227  { 3, 52, 64, 10, -1 },
228  { 0, 6, 58, 58, 6 },
229  { -1, 10, 64, 52, 3 },
230  { -2, 16, 69, 45, 0 },
231  { -2, 23, 71, 37, -1 },
232 };
233 
234 static const struct dispc_coef coef5_M16[8] = {
235  { 0, 31, 66, 31, 0 },
236  { 1, 38, 65, 25, -1 },
237  { 3, 44, 62, 20, -1 },
238  { 6, 49, 59, 14, 0 },
239  { 0, 10, 54, 54, 10 },
240  { 0, 14, 59, 49, 6 },
241  { -1, 20, 62, 44, 3 },
242  { -1, 25, 65, 38, 1 },
243 };
244 
245 static const struct dispc_coef coef5_M19[8] = {
246  { 3, 32, 58, 32, 3 },
247  { 4, 38, 58, 27, 1 },
248  { 7, 42, 55, 23, 1 },
249  { 10, 46, 54, 18, 0 },
250  { 0, 14, 50, 50, 14 },
251  { 0, 18, 54, 46, 10 },
252  { 1, 23, 55, 42, 7 },
253  { 1, 27, 58, 38, 4 },
254 };
255 
256 static const struct dispc_coef coef5_M22[8] = {
257  { 4, 33, 54, 33, 4 },
258  { 6, 37, 54, 28, 3 },
259  { 9, 41, 53, 24, 1 },
260  { 12, 45, 51, 20, 0 },
261  { 0, 16, 48, 48, 16 },
262  { 0, 20, 51, 45, 12 },
263  { 1, 24, 53, 41, 9 },
264  { 3, 28, 54, 37, 6 },
265 };
266 
267 static const struct dispc_coef coef5_M26[8] = {
268  { 6, 33, 50, 33, 6 },
269  { 8, 36, 51, 29, 4 },
270  { 11, 40, 50, 25, 2 },
271  { 14, 43, 48, 22, 1 },
272  { 0, 18, 46, 46, 18 },
273  { 1, 22, 48, 43, 14 },
274  { 2, 25, 50, 40, 11 },
275  { 4, 29, 51, 36, 8 },
276 };
277 
278 static const struct dispc_coef coef5_M32[8] = {
279  { 7, 33, 48, 33, 7 },
280  { 10, 36, 48, 29, 5 },
281  { 13, 39, 47, 26, 3 },
282  { 16, 42, 46, 23, 1 },
283  { 0, 19, 45, 45, 19 },
284  { 1, 23, 46, 42, 16 },
285  { 3, 26, 47, 39, 13 },
286  { 5, 29, 48, 36, 10 },
287 };
288 
289 const struct dispc_coef *dispc_ovl_get_scale_coef(int inc, int five_taps)
290 {
291  int i;
292  static const struct {
293  int Mmin;
294  int Mmax;
295  const struct dispc_coef *coef_3;
296  const struct dispc_coef *coef_5;
297  } coefs[] = {
298  { 27, 32, coef3_M32, coef5_M32 },
299  { 23, 26, coef3_M26, coef5_M26 },
300  { 20, 22, coef3_M22, coef5_M22 },
301  { 17, 19, coef3_M19, coef5_M19 },
302  { 15, 16, coef3_M16, coef5_M16 },
303  { 14, 14, coef3_M14, coef5_M14 },
304  { 13, 13, coef3_M13, coef5_M13 },
305  { 12, 12, coef3_M12, coef5_M12 },
306  { 11, 11, coef3_M11, coef5_M11 },
307  { 10, 10, coef3_M10, coef5_M10 },
308  { 9, 9, coef3_M9, coef5_M9 },
309  { 4, 8, coef3_M8, coef5_M8 },
310  /*
311  * When upscaling more than two times, blockiness and outlines
312  * around the image are observed when M8 tables are used. M11,
313  * M16 and M19 tables are used to prevent this.
314  */
315  { 3, 3, coef3_M11, coef5_M11 },
316  { 2, 2, coef3_M16, coef5_M16 },
317  { 0, 1, coef3_M19, coef5_M19 },
318  };
319 
320  inc /= 128;
321  for (i = 0; i < ARRAY_SIZE(coefs); ++i)
322  if (inc >= coefs[i].Mmin && inc <= coefs[i].Mmax)
323  return five_taps ? coefs[i].coef_5 : coefs[i].coef_3;
324  return NULL;
325 }
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