summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/amd/display/dc/dsc/rc_calc.c
blob: c6a1cd80aeae4fa71ee7fc7fff84fcbfb8282c17 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
/*
 * Copyright 2017 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 <drm/drm_dsc.h>

#include "os_types.h"
#include "rc_calc.h"
#include "qp_tables.h"

#define table_hash(mode, bpc, max_min) ((mode << 16) | (bpc << 8) | max_min)

#define MODE_SELECT(val444, val422, val420) \
	(cm == CM_444 || cm == CM_RGB) ? (val444) : (cm == CM_422 ? (val422) : (val420))


#define TABLE_CASE(mode, bpc, max)   case (table_hash(mode, BPC_##bpc, max)): \
	table = qp_table_##mode##_##bpc##bpc_##max; \
	table_size = sizeof(qp_table_##mode##_##bpc##bpc_##max)/sizeof(*qp_table_##mode##_##bpc##bpc_##max); \
	break


static void get_qp_set(qp_set qps, enum colour_mode cm, enum bits_per_comp bpc,
		       enum max_min max_min, float bpp)
{
	int mode = MODE_SELECT(444, 422, 420);
	int sel = table_hash(mode, bpc, max_min);
	int table_size = 0;
	int index;
	const struct qp_entry *table = 0L;

	// alias enum
	enum { min = DAL_MM_MIN, max = DAL_MM_MAX };
	switch (sel) {
		TABLE_CASE(444,  8, max);
		TABLE_CASE(444,  8, min);
		TABLE_CASE(444, 10, max);
		TABLE_CASE(444, 10, min);
		TABLE_CASE(444, 12, max);
		TABLE_CASE(444, 12, min);
		TABLE_CASE(422,  8, max);
		TABLE_CASE(422,  8, min);
		TABLE_CASE(422, 10, max);
		TABLE_CASE(422, 10, min);
		TABLE_CASE(422, 12, max);
		TABLE_CASE(422, 12, min);
		TABLE_CASE(420,  8, max);
		TABLE_CASE(420,  8, min);
		TABLE_CASE(420, 10, max);
		TABLE_CASE(420, 10, min);
		TABLE_CASE(420, 12, max);
		TABLE_CASE(420, 12, min);
	}

	if (table == 0)
		return;

	index = (bpp - table[0].bpp) * 2;

	/* requested size is bigger than the table */
	if (index >= table_size) {
		dm_error("ERROR: Requested rc_calc to find a bpp entry that exceeds the table size\n");
		return;
	}

	memcpy(qps, table[index].qps, sizeof(qp_set));
}

static double dsc_roundf(double num)
{
	if (num < 0.0)
		num = num - 0.5;
	else
		num = num + 0.5;

	return (int)(num);
}

static double dsc_ceil(double num)
{
	double retval = (int)num;

	if (retval != num && num > 0)
		retval = num + 1;

	return (int)retval;
}

static void get_ofs_set(qp_set ofs, enum colour_mode mode, float bpp)
{
	int   *p = ofs;

	if (mode == CM_444 || mode == CM_RGB) {
		*p++ = (bpp <=  6) ? (0) : ((((bpp >=  8) && (bpp <= 12))) ? (2) : ((bpp >= 15) ? (10) : ((((bpp > 6) && (bpp < 8))) ? (0 + dsc_roundf((bpp -  6) * (2 / 2.0))) : (2 + dsc_roundf((bpp - 12) * (8 / 3.0))))));
		*p++ = (bpp <=  6) ? (-2) : ((((bpp >=  8) && (bpp <= 12))) ? (0) : ((bpp >= 15) ? (8) : ((((bpp > 6) && (bpp < 8))) ? (-2 + dsc_roundf((bpp -  6) * (2 / 2.0))) : (0 + dsc_roundf((bpp - 12) * (8 / 3.0))))));
		*p++ = (bpp <=  6) ? (-2) : ((((bpp >=  8) && (bpp <= 12))) ? (0) : ((bpp >= 15) ? (6) : ((((bpp > 6) && (bpp < 8))) ? (-2 + dsc_roundf((bpp -  6) * (2 / 2.0))) : (0 + dsc_roundf((bpp - 12) * (6 / 3.0))))));
		*p++ = (bpp <=  6) ? (-4) : ((((bpp >=  8) && (bpp <= 12))) ? (-2) : ((bpp >= 15) ? (4) : ((((bpp > 6) && (bpp < 8))) ? (-4 + dsc_roundf((bpp -  6) * (2 / 2.0))) : (-2 + dsc_roundf((bpp - 12) * (6 / 3.0))))));
		*p++ = (bpp <=  6) ? (-6) : ((((bpp >=  8) && (bpp <= 12))) ? (-4) : ((bpp >= 15) ? (2) : ((((bpp > 6) && (bpp < 8))) ? (-6 + dsc_roundf((bpp -  6) * (2 / 2.0))) : (-4 + dsc_roundf((bpp - 12) * (6 / 3.0))))));
		*p++ = (bpp <= 12) ? (-6) : ((bpp >= 15) ? (0) : (-6 + dsc_roundf((bpp - 12) * (6 / 3.0))));
		*p++ = (bpp <= 12) ? (-8) : ((bpp >= 15) ? (-2) : (-8 + dsc_roundf((bpp - 12) * (6 / 3.0))));
		*p++ = (bpp <= 12) ? (-8) : ((bpp >= 15) ? (-4) : (-8 + dsc_roundf((bpp - 12) * (4 / 3.0))));
		*p++ = (bpp <= 12) ? (-8) : ((bpp >= 15) ? (-6) : (-8 + dsc_roundf((bpp - 12) * (2 / 3.0))));
		*p++ = (bpp <= 12) ? (-10) : ((bpp >= 15) ? (-8) : (-10 + dsc_roundf((bpp - 12) * (2 / 3.0))));
		*p++ = -10;
		*p++ = (bpp <=  6) ? (-12) : ((bpp >=  8) ? (-10) : (-12 + dsc_roundf((bpp -  6) * (2 / 2.0))));
		*p++ = -12;
		*p++ = -12;
		*p++ = -12;
	} else if (mode == CM_422) {
		*p++ = (bpp <=  8) ? (2) : ((bpp >= 10) ? (10) : (2 + dsc_roundf((bpp -  8) * (8 / 2.0))));
		*p++ = (bpp <=  8) ? (0) : ((bpp >= 10) ? (8) : (0 + dsc_roundf((bpp -  8) * (8 / 2.0))));
		*p++ = (bpp <=  8) ? (0) : ((bpp >= 10) ? (6) : (0 + dsc_roundf((bpp -  8) * (6 / 2.0))));
		*p++ = (bpp <=  8) ? (-2) : ((bpp >= 10) ? (4) : (-2 + dsc_roundf((bpp -  8) * (6 / 2.0))));
		*p++ = (bpp <=  8) ? (-4) : ((bpp >= 10) ? (2) : (-4 + dsc_roundf((bpp -  8) * (6 / 2.0))));
		*p++ = (bpp <=  8) ? (-6) : ((bpp >= 10) ? (0) : (-6 + dsc_roundf((bpp -  8) * (6 / 2.0))));
		*p++ = (bpp <=  8) ? (-8) : ((bpp >= 10) ? (-2) : (-8 + dsc_roundf((bpp -  8) * (6 / 2.0))));
		*p++ = (bpp <=  8) ? (-8) : ((bpp >= 10) ? (-4) : (-8 + dsc_roundf((bpp -  8) * (4 / 2.0))));
		*p++ = (bpp <=  8) ? (-8) : ((bpp >= 10) ? (-6) : (-8 + dsc_roundf((bpp -  8) * (2 / 2.0))));
		*p++ = (bpp <=  8) ? (-10) : ((bpp >= 10) ? (-8) : (-10 + dsc_roundf((bpp -  8) * (2 / 2.0))));
		*p++ = -10;
		*p++ = (bpp <=  6) ? (-12) : ((bpp >= 7) ? (-10) : (-12 + dsc_roundf((bpp -  6) * (2.0 / 1))));
		*p++ = -12;
		*p++ = -12;
		*p++ = -12;
	} else {
		*p++ = (bpp <=  6) ? (2) : ((bpp >=  8) ? (10) : (2 + dsc_roundf((bpp -  6) * (8 / 2.0))));
		*p++ = (bpp <=  6) ? (0) : ((bpp >=  8) ? (8) : (0 + dsc_roundf((bpp -  6) * (8 / 2.0))));
		*p++ = (bpp <=  6) ? (0) : ((bpp >=  8) ? (6) : (0 + dsc_roundf((bpp -  6) * (6 / 2.0))));
		*p++ = (bpp <=  6) ? (-2) : ((bpp >=  8) ? (4) : (-2 + dsc_roundf((bpp -  6) * (6 / 2.0))));
		*p++ = (bpp <=  6) ? (-4) : ((bpp >=  8) ? (2) : (-4 + dsc_roundf((bpp -  6) * (6 / 2.0))));
		*p++ = (bpp <=  6) ? (-6) : ((bpp >=  8) ? (0) : (-6 + dsc_roundf((bpp -  6) * (6 / 2.0))));
		*p++ = (bpp <=  6) ? (-8) : ((bpp >=  8) ? (-2) : (-8 + dsc_roundf((bpp -  6) * (6 / 2.0))));
		*p++ = (bpp <=  6) ? (-8) : ((bpp >=  8) ? (-4) : (-8 + dsc_roundf((bpp -  6) * (4 / 2.0))));
		*p++ = (bpp <=  6) ? (-8) : ((bpp >=  8) ? (-6) : (-8 + dsc_roundf((bpp -  6) * (2 / 2.0))));
		*p++ = (bpp <=  6) ? (-10) : ((bpp >=  8) ? (-8) : (-10 + dsc_roundf((bpp -  6) * (2 / 2.0))));
		*p++ = -10;
		*p++ = (bpp <=  4) ? (-12) : ((bpp >=  5) ? (-10) : (-12 + dsc_roundf((bpp -  4) * (2 / 1.0))));
		*p++ = -12;
		*p++ = -12;
		*p++ = -12;
	}
}

static int median3(int a, int b, int c)
{
	if (a > b)
		swap(a, b);
	if (b > c)
		swap(b, c);
	if (a > b)
		swap(b, c);

	return b;
}

static void _do_calc_rc_params(struct rc_params *rc, enum colour_mode cm,
			       enum bits_per_comp bpc, u16 drm_bpp,
			       bool is_navite_422_or_420,
			       int slice_width, int slice_height,
			       int minor_version)
{
	float bpp;
	float bpp_group;
	float initial_xmit_delay_factor;
	int padding_pixels;
	int i;

	bpp = ((float)drm_bpp / 16.0);
	/* in native_422 or native_420 modes, the bits_per_pixel is double the
	 * target bpp (the latter is what calc_rc_params expects)
	 */
	if (is_navite_422_or_420)
		bpp /= 2.0;

	rc->rc_quant_incr_limit0 = ((bpc == BPC_8) ? 11 : (bpc == BPC_10 ? 15 : 19)) - ((minor_version == 1 && cm == CM_444) ? 1 : 0);
	rc->rc_quant_incr_limit1 = ((bpc == BPC_8) ? 11 : (bpc == BPC_10 ? 15 : 19)) - ((minor_version == 1 && cm == CM_444) ? 1 : 0);

	bpp_group = MODE_SELECT(bpp, bpp * 2.0, bpp * 2.0);

	switch (cm) {
	case CM_420:
		rc->initial_fullness_offset = (bpp >=  6) ? (2048) : ((bpp <=  4) ? (6144) : ((((bpp >  4) && (bpp <=  5))) ? (6144 - dsc_roundf((bpp - 4) * (512))) : (5632 - dsc_roundf((bpp -  5) * (3584)))));
		rc->first_line_bpg_offset   = median3(0, (12 + (int) (0.09 *  min(34, slice_height - 8))), (int)((3 * bpc * 3) - (3 * bpp_group)));
		rc->second_line_bpg_offset  = median3(0, 12, (int)((3 * bpc * 3) - (3 * bpp_group)));
		break;
	case CM_422:
		rc->initial_fullness_offset = (bpp >=  8) ? (2048) : ((bpp <=  7) ? (5632) : (5632 - dsc_roundf((bpp - 7) * (3584))));
		rc->first_line_bpg_offset   = median3(0, (12 + (int) (0.09 *  min(34, slice_height - 8))), (int)((3 * bpc * 4) - (3 * bpp_group)));
		rc->second_line_bpg_offset  = 0;
		break;
	case CM_444:
	case CM_RGB:
		rc->initial_fullness_offset = (bpp >= 12) ? (2048) : ((bpp <=  8) ? (6144) : ((((bpp >  8) && (bpp <= 10))) ? (6144 - dsc_roundf((bpp - 8) * (512 / 2))) : (5632 - dsc_roundf((bpp - 10) * (3584 / 2)))));
		rc->first_line_bpg_offset   = median3(0, (12 + (int) (0.09 *  min(34, slice_height - 8))), (int)(((3 * bpc + (cm == CM_444 ? 0 : 2)) * 3) - (3 * bpp_group)));
		rc->second_line_bpg_offset  = 0;
		break;
	}

	initial_xmit_delay_factor = (cm == CM_444 || cm == CM_RGB) ? 1.0 : 2.0;
	rc->initial_xmit_delay = dsc_roundf(8192.0/2.0/bpp/initial_xmit_delay_factor);

	if (cm == CM_422 || cm == CM_420)
		slice_width /= 2;

	padding_pixels = ((slice_width % 3) != 0) ? (3 - (slice_width % 3)) * (rc->initial_xmit_delay / slice_width) : 0;
	if (3 * bpp_group >= (((rc->initial_xmit_delay + 2) / 3) * (3 + (cm == CM_422)))) {
		if ((rc->initial_xmit_delay + padding_pixels) % 3 == 1)
			rc->initial_xmit_delay++;
	}

	rc->flatness_min_qp     = ((bpc == BPC_8) ?  (3) : ((bpc == BPC_10) ? (7)  : (11))) - ((minor_version == 1 && cm == CM_444) ? 1 : 0);
	rc->flatness_max_qp     = ((bpc == BPC_8) ? (12) : ((bpc == BPC_10) ? (16) : (20))) - ((minor_version == 1 && cm == CM_444) ? 1 : 0);
	rc->flatness_det_thresh = 2 << (bpc - 8);

	get_qp_set(rc->qp_min, cm, bpc, DAL_MM_MIN, bpp);
	get_qp_set(rc->qp_max, cm, bpc, DAL_MM_MAX, bpp);
	if (cm == CM_444 && minor_version == 1) {
		for (i = 0; i < QP_SET_SIZE; ++i) {
			rc->qp_min[i] = rc->qp_min[i] > 0 ? rc->qp_min[i] - 1 : 0;
			rc->qp_max[i] = rc->qp_max[i] > 0 ? rc->qp_max[i] - 1 : 0;
		}
	}
	get_ofs_set(rc->ofs, cm, bpp);

	/* fixed parameters */
	rc->rc_model_size    = 8192;
	rc->rc_edge_factor   = 6;
	rc->rc_tgt_offset_hi = 3;
	rc->rc_tgt_offset_lo = 3;

	rc->rc_buf_thresh[0] = 896;
	rc->rc_buf_thresh[1] = 1792;
	rc->rc_buf_thresh[2] = 2688;
	rc->rc_buf_thresh[3] = 3584;
	rc->rc_buf_thresh[4] = 4480;
	rc->rc_buf_thresh[5] = 5376;
	rc->rc_buf_thresh[6] = 6272;
	rc->rc_buf_thresh[7] = 6720;
	rc->rc_buf_thresh[8] = 7168;
	rc->rc_buf_thresh[9] = 7616;
	rc->rc_buf_thresh[10] = 7744;
	rc->rc_buf_thresh[11] = 7872;
	rc->rc_buf_thresh[12] = 8000;
	rc->rc_buf_thresh[13] = 8064;
}

static u32 _do_bytes_per_pixel_calc(int slice_width, u16 drm_bpp,
				    bool is_navite_422_or_420)
{
	float bpp;
	u32 bytes_per_pixel;
	double d_bytes_per_pixel;

	bpp = ((float)drm_bpp / 16.0);
	d_bytes_per_pixel = dsc_ceil(bpp * slice_width / 8.0) / slice_width;
	// TODO: Make sure the formula for calculating this is precise (ceiling
	// vs. floor, and at what point they should be applied)
	if (is_navite_422_or_420)
		d_bytes_per_pixel /= 2;

	bytes_per_pixel = (u32)dsc_ceil(d_bytes_per_pixel * 0x10000000);

	return bytes_per_pixel;
}

static u32 _do_calc_dsc_bpp_x16(u32 stream_bandwidth_kbps, u32 pix_clk_100hz,
				u32 bpp_increment_div)
{
	u32 dsc_target_bpp_x16;
	float f_dsc_target_bpp;
	float f_stream_bandwidth_100bps;
	// bpp_increment_div is actually precision
	u32 precision = bpp_increment_div;

	f_stream_bandwidth_100bps = stream_bandwidth_kbps * 10.0f;
	f_dsc_target_bpp = f_stream_bandwidth_100bps / pix_clk_100hz;

	// Round down to the nearest precision stop to bring it into DSC spec
	// range
	dsc_target_bpp_x16 = (u32)(f_dsc_target_bpp * precision);
	dsc_target_bpp_x16 = (dsc_target_bpp_x16 * 16) / precision;

	return dsc_target_bpp_x16;
}

/**
 * calc_rc_params - reads the user's cmdline mode
 * @rc: DC internal DSC parameters
 * @pps: DRM struct with all required DSC values
 *
 * This function expects a drm_dsc_config data struct with all the required DSC
 * values previously filled out by our driver and based on this information it
 * computes some of the DSC values.
 *
 * @note This calculation requires float point operation, most of it executes
 * under kernel_fpu_{begin,end}.
 */
void calc_rc_params(struct rc_params *rc, const struct drm_dsc_config *pps)
{
	enum colour_mode mode;
	enum bits_per_comp bpc;
	bool is_navite_422_or_420;
	u16 drm_bpp = pps->bits_per_pixel;
	int slice_width  = pps->slice_width;
	int slice_height = pps->slice_height;

	mode = pps->convert_rgb ? CM_RGB : (pps->simple_422  ? CM_444 :
					   (pps->native_422  ? CM_422 :
					    pps->native_420  ? CM_420 : CM_444));
	bpc = (pps->bits_per_component == 8) ? BPC_8 : (pps->bits_per_component == 10)
					     ? BPC_10 : BPC_12;

	is_navite_422_or_420 = pps->native_422 || pps->native_420;

	DC_FP_START();
	_do_calc_rc_params(rc, mode, bpc, drm_bpp, is_navite_422_or_420,
			   slice_width, slice_height,
			   pps->dsc_version_minor);
	DC_FP_END();
}

/**
 * calc_dsc_bytes_per_pixel - calculate bytes per pixel
 * @pps: DRM struct with all required DSC values
 *
 * Based on the information inside drm_dsc_config, this function calculates the
 * total of bytes per pixel.
 *
 * @note This calculation requires float point operation, most of it executes
 * under kernel_fpu_{begin,end}.
 *
 * Return:
 * Return the number of bytes per pixel
 */
u32 calc_dsc_bytes_per_pixel(const struct drm_dsc_config *pps)

{
	u32 ret;
	u16 drm_bpp = pps->bits_per_pixel;
	int slice_width  = pps->slice_width;
	bool is_navite_422_or_420 = pps->native_422 || pps->native_420;

	DC_FP_START();
	ret = _do_bytes_per_pixel_calc(slice_width, drm_bpp,
				       is_navite_422_or_420);
	DC_FP_END();
	return ret;
}

/**
 * calc_dsc_bpp_x16 - retrieve the dsc bits per pixel
 * @stream_bandwidth_kbps:
 * @pix_clk_100hz:
 * @bpp_increment_div:
 *
 * Calculate the total of bits per pixel for DSC configuration.
 *
 * @note This calculation requires float point operation, most of it executes
 * under kernel_fpu_{begin,end}.
 */
u32 calc_dsc_bpp_x16(u32 stream_bandwidth_kbps, u32 pix_clk_100hz,
		     u32 bpp_increment_div)
{
	u32 dsc_bpp;

	DC_FP_START();
	dsc_bpp =  _do_calc_dsc_bpp_x16(stream_bandwidth_kbps, pix_clk_100hz,
					bpp_increment_div);
	DC_FP_END();
	return dsc_bpp;
}