1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Color space converter library
4 *
5 * Copyright (c) 2013 Texas Instruments Inc.
6 *
7 * David Griego, <dagriego@biglakesoftware.com>
8 * Dale Farnsworth, <dale@farnsworth.org>
9 * Archit Taneja, <archit@ti.com>
10 */
11
12 #include <linux/err.h>
13 #include <linux/io.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/slab.h>
17 #include <linux/videodev2.h>
18 #include <media/v4l2-common.h>
19
20 #include "csc.h"
21
22 /*
23 * 12 coefficients in the order:
24 * a0, b0, c0, a1, b1, c1, a2, b2, c2, d0, d1, d2
25 */
26 struct quantization {
27 u16 coeff[12];
28 };
29
30 struct colorspace {
31 struct quantization limited;
32 struct quantization full;
33 };
34
35 struct encoding_direction {
36 struct colorspace r601;
37 struct colorspace r709;
38 };
39
40 struct csc_coeffs {
41 struct encoding_direction y2r;
42 struct encoding_direction r2y;
43 };
44
45 /* default colorspace coefficients */
46 static struct csc_coeffs csc_coeffs = {
47 .y2r = {
48 .r601 = {
49 .limited = {
50 { /* SDTV */
51 0x0400, 0x0000, 0x057D, 0x0400, 0x1EA7, 0x1D35,
52 0x0400, 0x06EF, 0x1FFE, 0x0D40, 0x0210, 0x0C88,
53 }
54 },
55 .full = {
56 { /* SDTV */
57 0x04A8, 0x1FFE, 0x0662, 0x04A8, 0x1E6F, 0x1CBF,
58 0x04A8, 0x0812, 0x1FFF, 0x0C84, 0x0220, 0x0BAC,
59 }
60 },
61 },
62 .r709 = {
63 .limited = {
64 { /* HDTV */
65 0x0400, 0x0000, 0x0629, 0x0400, 0x1F45, 0x1E2B,
66 0x0400, 0x0742, 0x0000, 0x0CEC, 0x0148, 0x0C60,
67 }
68 },
69 .full = {
70 { /* HDTV */
71 0x04A8, 0x0000, 0x072C, 0x04A8, 0x1F26, 0x1DDE,
72 0x04A8, 0x0873, 0x0000, 0x0C20, 0x0134, 0x0B7C,
73 }
74 },
75 },
76 },
77 .r2y = {
78 .r601 = {
79 .limited = {
80 { /* SDTV */
81 0x0132, 0x0259, 0x0075, 0x1F50, 0x1EA5, 0x020B,
82 0x020B, 0x1E4A, 0x1FAB, 0x0000, 0x0200, 0x0200,
83 }
84 },
85 .full = {
86 { /* SDTV */
87 0x0107, 0x0204, 0x0064, 0x1F68, 0x1ED6, 0x01C2,
88 0x01C2, 0x1E87, 0x1FB7, 0x0040, 0x0200, 0x0200,
89 }
90 },
91 },
92 .r709 = {
93 .limited = {
94 { /* HDTV */
95 0x00DA, 0x02DC, 0x004A, 0x1F88, 0x1E6C, 0x020C,
96 0x020C, 0x1E24, 0x1FD0, 0x0000, 0x0200, 0x0200,
97 }
98 },
99 .full = {
100 { /* HDTV */
101 0x00bb, 0x0275, 0x003f, 0x1f99, 0x1ea5, 0x01c2,
102 0x01c2, 0x1e67, 0x1fd7, 0x0040, 0x0200, 0x0200,
103 }
104 },
105 },
106 },
107
108 };
109
csc_dump_regs(struct csc_data * csc)110 void csc_dump_regs(struct csc_data *csc)
111 {
112 struct device *dev = &csc->pdev->dev;
113
114 #define DUMPREG(r) dev_dbg(dev, "%-35s %08x\n", #r, \
115 ioread32(csc->base + CSC_##r))
116
117 dev_dbg(dev, "CSC Registers @ %pa:\n", &csc->res->start);
118
119 DUMPREG(CSC00);
120 DUMPREG(CSC01);
121 DUMPREG(CSC02);
122 DUMPREG(CSC03);
123 DUMPREG(CSC04);
124 DUMPREG(CSC05);
125
126 #undef DUMPREG
127 }
128 EXPORT_SYMBOL(csc_dump_regs);
129
csc_set_coeff_bypass(struct csc_data * csc,u32 * csc_reg5)130 void csc_set_coeff_bypass(struct csc_data *csc, u32 *csc_reg5)
131 {
132 *csc_reg5 |= CSC_BYPASS;
133 }
134 EXPORT_SYMBOL(csc_set_coeff_bypass);
135
136 /*
137 * set the color space converter coefficient shadow register values
138 */
csc_set_coeff(struct csc_data * csc,u32 * csc_reg0,struct v4l2_format * src_fmt,struct v4l2_format * dst_fmt)139 void csc_set_coeff(struct csc_data *csc, u32 *csc_reg0,
140 struct v4l2_format *src_fmt, struct v4l2_format *dst_fmt)
141 {
142 u32 *csc_reg5 = csc_reg0 + 5;
143 u32 *shadow_csc = csc_reg0;
144 u16 *coeff, *end_coeff;
145 const struct v4l2_pix_format *pix;
146 const struct v4l2_pix_format_mplane *mp;
147 const struct v4l2_format_info *src_finfo, *dst_finfo;
148 enum v4l2_ycbcr_encoding src_ycbcr_enc, dst_ycbcr_enc;
149 enum v4l2_quantization src_quantization, dst_quantization;
150 u32 src_pixelformat, dst_pixelformat;
151
152 if (V4L2_TYPE_IS_MULTIPLANAR(src_fmt->type)) {
153 mp = &src_fmt->fmt.pix_mp;
154 src_pixelformat = mp->pixelformat;
155 src_ycbcr_enc = mp->ycbcr_enc;
156 src_quantization = mp->quantization;
157 } else {
158 pix = &src_fmt->fmt.pix;
159 src_pixelformat = pix->pixelformat;
160 src_ycbcr_enc = pix->ycbcr_enc;
161 src_quantization = pix->quantization;
162 }
163
164 if (V4L2_TYPE_IS_MULTIPLANAR(dst_fmt->type)) {
165 mp = &dst_fmt->fmt.pix_mp;
166 dst_pixelformat = mp->pixelformat;
167 dst_ycbcr_enc = mp->ycbcr_enc;
168 dst_quantization = mp->quantization;
169 } else {
170 pix = &dst_fmt->fmt.pix;
171 dst_pixelformat = pix->pixelformat;
172 dst_ycbcr_enc = pix->ycbcr_enc;
173 dst_quantization = pix->quantization;
174 }
175
176 src_finfo = v4l2_format_info(src_pixelformat);
177 dst_finfo = v4l2_format_info(dst_pixelformat);
178
179 if (v4l2_is_format_yuv(src_finfo) &&
180 v4l2_is_format_rgb(dst_finfo)) {
181 /* Y2R */
182
183 /*
184 * These are not the standard default values but are
185 * set this way for historical compatibility
186 */
187 if (src_ycbcr_enc == V4L2_YCBCR_ENC_DEFAULT)
188 src_ycbcr_enc = V4L2_YCBCR_ENC_601;
189
190 if (src_quantization == V4L2_QUANTIZATION_DEFAULT)
191 src_quantization = V4L2_QUANTIZATION_FULL_RANGE;
192
193 if (src_ycbcr_enc == V4L2_YCBCR_ENC_601) {
194 if (src_quantization == V4L2_QUANTIZATION_FULL_RANGE)
195 coeff = csc_coeffs.y2r.r601.full.coeff;
196 else
197 coeff = csc_coeffs.y2r.r601.limited.coeff;
198 } else if (src_ycbcr_enc == V4L2_YCBCR_ENC_709) {
199 if (src_quantization == V4L2_QUANTIZATION_FULL_RANGE)
200 coeff = csc_coeffs.y2r.r709.full.coeff;
201 else
202 coeff = csc_coeffs.y2r.r709.limited.coeff;
203 } else {
204 /* Should never reach this, but it keeps gcc happy */
205 coeff = csc_coeffs.y2r.r601.full.coeff;
206 }
207 } else if (v4l2_is_format_rgb(src_finfo) &&
208 v4l2_is_format_yuv(dst_finfo)) {
209 /* R2Y */
210
211 /*
212 * These are not the standard default values but are
213 * set this way for historical compatibility
214 */
215 if (dst_ycbcr_enc == V4L2_YCBCR_ENC_DEFAULT)
216 dst_ycbcr_enc = V4L2_YCBCR_ENC_601;
217
218 if (dst_quantization == V4L2_QUANTIZATION_DEFAULT)
219 dst_quantization = V4L2_QUANTIZATION_FULL_RANGE;
220
221 if (dst_ycbcr_enc == V4L2_YCBCR_ENC_601) {
222 if (dst_quantization == V4L2_QUANTIZATION_FULL_RANGE)
223 coeff = csc_coeffs.r2y.r601.full.coeff;
224 else
225 coeff = csc_coeffs.r2y.r601.limited.coeff;
226 } else if (dst_ycbcr_enc == V4L2_YCBCR_ENC_709) {
227 if (dst_quantization == V4L2_QUANTIZATION_FULL_RANGE)
228 coeff = csc_coeffs.r2y.r709.full.coeff;
229 else
230 coeff = csc_coeffs.r2y.r709.limited.coeff;
231 } else {
232 /* Should never reach this, but it keeps gcc happy */
233 coeff = csc_coeffs.r2y.r601.full.coeff;
234 }
235 } else {
236 *csc_reg5 |= CSC_BYPASS;
237 return;
238 }
239
240 end_coeff = coeff + 12;
241
242 for (; coeff < end_coeff; coeff += 2)
243 *shadow_csc++ = (*(coeff + 1) << 16) | *coeff;
244 }
245 EXPORT_SYMBOL(csc_set_coeff);
246
csc_create(struct platform_device * pdev,const char * res_name)247 struct csc_data *csc_create(struct platform_device *pdev, const char *res_name)
248 {
249 struct csc_data *csc;
250
251 dev_dbg(&pdev->dev, "csc_create\n");
252
253 csc = devm_kzalloc(&pdev->dev, sizeof(*csc), GFP_KERNEL);
254 if (!csc) {
255 dev_err(&pdev->dev, "couldn't alloc csc_data\n");
256 return ERR_PTR(-ENOMEM);
257 }
258
259 csc->pdev = pdev;
260
261 csc->res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
262 res_name);
263 if (csc->res == NULL) {
264 dev_err(&pdev->dev, "missing '%s' platform resources data\n",
265 res_name);
266 return ERR_PTR(-ENODEV);
267 }
268
269 csc->base = devm_ioremap_resource(&pdev->dev, csc->res);
270 if (IS_ERR(csc->base))
271 return ERR_CAST(csc->base);
272
273 return csc;
274 }
275 EXPORT_SYMBOL(csc_create);
276
277 MODULE_DESCRIPTION("TI VIP/VPE Color Space Converter");
278 MODULE_AUTHOR("Texas Instruments Inc.");
279 MODULE_LICENSE("GPL v2");
280