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
36 	struct rsnd_kctrl_cfg_s sen;  /* sync convert enable */
37 	struct rsnd_kctrl_cfg_s sync; /* sync convert */
44 #define rsnd_src_get(priv, id) ((struct rsnd_src *)(priv->src) + id)
45 #define rsnd_src_nr(priv) ((priv)->src_nr)
46 #define rsnd_src_sync_is_enabled(mod) (rsnd_mod_to_src(mod)->sen.val)
54 	     ((pos) = (struct rsnd_src *)(priv)->src + i);	\
59  *		image of SRC (Sampling Rate Converter)
61  * 96kHz   <-> +-----+	48kHz	+-----+	 48kHz	+-------+
62  * 48kHz   <-> | SRC | <------>	| SSI |	<----->	| codec |
63  * 44.1kHz <-> +-----+		+-----+		+-------+
104 	convert_rate = src->current_sync_rate;  in rsnd_src_convert_rate()
110 		convert_rate = runtime->rate;  in rsnd_src_convert_rate()
121 	unsigned int rate = 0;  in rsnd_src_get_rate()  local
126 	 * runtime_rate -> [SRC] -> convert_rate  in rsnd_src_get_rate()
129 	 * convert_rate -> [SRC] -> runtime_rate  in rsnd_src_get_rate()
133 		return runtime->rate;  in rsnd_src_get_rate()
136 	 * return convert rate if SRC is used,  in rsnd_src_get_rate()
137 	 * otherwise, return runtime->rate as usual  in rsnd_src_get_rate()
140 		rate = rsnd_src_convert_rate(io, src_mod);  in rsnd_src_get_rate()
142 	if (!rate)  in rsnd_src_get_rate()
143 		rate = runtime->rate;  in rsnd_src_get_rate()
145 	return rate;  in rsnd_src_get_rate()
149 	0x01800000, /* 6 - 1/6 */
150 	0x01000000, /* 6 - 1/4 */
151 	0x00c00000, /* 6 - 1/3 */
152 	0x00800000, /* 6 - 1/2 */
153 	0x00600000, /* 6 - 2/3 */
154 	0x00400000, /* 6 - 1   */
158 	0x02400000, /* 6 - 1/6 */
159 	0x01800000, /* 6 - 1/4 */
160 	0x01200000, /* 6 - 1/3 */
161 	0x00c00000, /* 6 - 1/2 */
162 	0x00900000, /* 6 - 2/3 */
163 	0x00600000, /* 6 - 1   */
167 	0x00100060, /* 6 - 1/6 */
168 	0x00100040, /* 6 - 1/4 */
169 	0x00100030, /* 6 - 1/3 */
170 	0x00100020, /* 6 - 1/2 */
171 	0x00100020, /* 6 - 2/3 */
172 	0x00100020, /* 6 - 1   */
209 	int inc, cnt, rate;  in rsnd_src_set_convert_rate()  local
221 	new_rate = src->sync.val;  in rsnd_src_set_convert_rate()
227 	if (new_rate == src->current_sync_rate)  in rsnd_src_set_convert_rate()
236 	cnt = abs(new_rate - fout) / inc;  in rsnd_src_set_convert_rate()
238 		inc *= -1;  in rsnd_src_set_convert_rate()
245 	rate  = fout;  in rsnd_src_set_convert_rate()
248 		rate += inc;  in rsnd_src_set_convert_rate()
249 		do_div(val, rate);  in rsnd_src_set_convert_rate()
259 	src->current_sync_rate = new_rate;  in rsnd_src_set_convert_rate()
288 	/* 6 - 1/6 are very enough ratio for SRC_BSDSR */  in rsnd_src_init_convert_rate()
416 	int irq = src->irq;  in rsnd_src_irq()
424 	 * IRQ is not supported on non-DT  in rsnd_src_irq()
495 	 * Enable SRC output if you want to use sync convert together with DVC  in rsnd_src_start()
522 	src->sync.val		=  in rsnd_src_init()
523 	src->current_sync_rate	= 0;  in rsnd_src_init()
549 	src->sync.val		=  in rsnd_src_quit()
550 	src->current_sync_rate	= 0;  in rsnd_src_quit()
561 	spin_lock(&priv->lock);  in __rsnd_src_interrupt()
573 	spin_unlock(&priv->lock);  in __rsnd_src_interrupt()
576 		snd_pcm_stop_xrun(io->substream);  in __rsnd_src_interrupt()
596 		dev_warn(dev, "\"SRC Out Rate\" can use during running\n");  in rsnd_src_kctrl_accept_runtime()
610 	int irq = src->irq;  in rsnd_src_probe_()
615 		 * IRQ is not supported on non-DT  in rsnd_src_probe_()
627 	ret = rsnd_dma_attach(io, mod, &src->dma);  in rsnd_src_probe_()
640 	 * enable SRC sync convert if possible  in rsnd_src_pcm_new()
644 	 * It can't use SRC Synchronous convert  in rsnd_src_pcm_new()
651 	 * enable sync convert  in rsnd_src_pcm_new()
655 			       "SRC Out Rate Switch" :  in rsnd_src_pcm_new()
656 			       "SRC In Rate Switch",  in rsnd_src_pcm_new()
659 			       &src->sen, 1);  in rsnd_src_pcm_new()
665 			       "SRC Out Rate" :  in rsnd_src_pcm_new()
666 			       "SRC In Rate",  in rsnd_src_pcm_new()
669 			       &src->sync, 192000);  in rsnd_src_pcm_new()
731 		ret = -EINVAL;  in rsnd_src_probe()
737 		ret = -ENOMEM;  in rsnd_src_probe()
741 	priv->src_nr	= nr;  in rsnd_src_probe()
742 	priv->src	= src;  in rsnd_src_probe()
751 			ret = -EINVAL;  in rsnd_src_probe()
761 		src->irq = irq_of_parse_and_map(np, 0);  in rsnd_src_probe()
762 		if (!src->irq) {  in rsnd_src_probe()
763 			ret = -EINVAL;  in rsnd_src_probe()