sh/rcar/src.c

1 // SPDX-License-Identifier: GPL-2.0
3 // Renesas R-Car SRC support
9  * You can use Synchronous Sampling Rate Convert (if no DVC)
11  *	amixer set "SRC Out Rate" on
13  *	amixer set "SRC Out Rate" 96000 // convert rate to 96000Hz
14  *	amixer set "SRC Out Rate" 22050 // convert rate to 22050Hz
35 	struct rsnd_kctrl_cfg_s sen;  /* sync convert enable */
36 	struct rsnd_kctrl_cfg_s sync; /* sync convert */
43 #define rsnd_src_get(priv, id) ((struct rsnd_src *)(priv->src) + id)
44 #define rsnd_src_nr(priv) ((priv)->src_nr)
45 #define rsnd_src_sync_is_enabled(mod) (rsnd_mod_to_src(mod)->sen.val)
53 	     ((pos) = (struct rsnd_src *)(priv)->src + i);	\
58  *		image of SRC (Sampling Rate Converter)
60  * 96kHz   <-> +-----+	48kHz	+-----+	 48kHz	+-------+
61  * 48kHz   <-> | SRC | <------>	| SSI |	<----->	| codec |
62  * 44.1kHz <-> +-----+		+-----+		+-------+
103 	convert_rate = src->current_sync_rate;
109 		convert_rate = runtime->rate;
120 	unsigned int rate = 0;
125 	 * runtime_rate -> [SRC] -> convert_rate
128 	 * convert_rate -> [SRC] -> runtime_rate
132 		return runtime->rate;
135 	 * return convert rate if SRC is used,
136 	 * otherwise, return runtime->rate as usual
139 		rate = rsnd_src_convert_rate(io, src_mod);
141 	if (!rate)
142 		rate = runtime->rate;
144 	return rate;
148 	0x01800000, /* 6 - 1/6 */
149 	0x01000000, /* 6 - 1/4 */
150 	0x00c00000, /* 6 - 1/3 */
151 	0x00800000, /* 6 - 1/2 */
152 	0x00600000, /* 6 - 2/3 */
153 	0x00400000, /* 6 - 1   */
157 	0x02400000, /* 6 - 1/6 */
158 	0x01800000, /* 6 - 1/4 */
159 	0x01200000, /* 6 - 1/3 */
160 	0x00c00000, /* 6 - 1/2 */
161 	0x00900000, /* 6 - 2/3 */
162 	0x00600000, /* 6 - 1   */
166 	0x00100060, /* 6 - 1/6 */
167 	0x00100040, /* 6 - 1/4 */
168 	0x00100030, /* 6 - 1/3 */
169 	0x00100020, /* 6 - 1/2 */
170 	0x00100020, /* 6 - 2/3 */
171 	0x00100020, /* 6 - 1   */
208 	int inc, cnt, rate;
220 	new_rate = src->sync.val;
226 	if (new_rate == src->current_sync_rate)
235 	cnt = abs(new_rate - fout) / inc;
237 		inc *= -1;
244 	rate  = fout;
247 		rate += inc;
248 		do_div(val, rate);
258 	src->current_sync_rate = new_rate;
287 	/* 6 - 1/6 are very enough ratio for SRC_BSDSR */
415 	int irq = src->irq;
423 	 * IRQ is not supported on non-DT
494 	 * Enable SRC output if you want to use sync convert together with DVC
521 	src->sync.val		=
522 	src->current_sync_rate	= 0;
548 	src->sync.val		=
549 	src->current_sync_rate	= 0;
560 	spin_lock(&priv->lock);
572 	spin_unlock(&priv->lock);
575 		snd_pcm_stop_xrun(io->substream);
595 		dev_warn(dev, "\"SRC Out Rate\" can use during running\n");
609 	int irq = src->irq;
614 		 * IRQ is not supported on non-DT
626 	ret = rsnd_dma_attach(io, mod, &src->dma);
639 	 * enable SRC sync convert if possible
643 	 * It can't use SRC Synchronous convert
650 	 * enable sync convert
654 			       "SRC Out Rate Switch" :
655 			       "SRC In Rate Switch",
658 			       &src->sen, 1);
664 			       "SRC Out Rate" :
665 			       "SRC In Rate",
668 			       &src->sync, 192000);
734 		ret = -EINVAL;
740 		ret = -ENOMEM;
744 	priv->src_nr	= nr;
745 	priv->src	= src;
754 			ret = -EINVAL;
764 		src->irq = irq_of_parse_and_map(np, 0);
765 		if (!src->irq) {
766 			ret = -EINVAL;