1 // SPDX-License-Identifier: MIT
2 /*
3  * Copyright (C) 2019 NVIDIA Corporation
4  */
5 
6 #include <linux/bug.h>
7 
8 #include <sound/hda_verbs.h>
9 
10 #include "hda.h"
11 
tegra_hda_parse_format(unsigned int format,struct tegra_hda_format * fmt)12 void tegra_hda_parse_format(unsigned int format, struct tegra_hda_format *fmt)
13 {
14 	unsigned int mul, div, bits, channels;
15 
16 	if (format & AC_FMT_TYPE_NON_PCM)
17 		fmt->pcm = false;
18 	else
19 		fmt->pcm = true;
20 
21 	if (format & AC_FMT_BASE_44K)
22 		fmt->sample_rate = 44100;
23 	else
24 		fmt->sample_rate = 48000;
25 
26 	mul = (format & AC_FMT_MULT_MASK) >> AC_FMT_MULT_SHIFT;
27 	div = (format & AC_FMT_DIV_MASK) >> AC_FMT_DIV_SHIFT;
28 
29 	fmt->sample_rate *= (mul + 1) / (div + 1);
30 
31 	switch (format & AC_FMT_BITS_MASK) {
32 	case AC_FMT_BITS_8:
33 		fmt->bits = 8;
34 		break;
35 
36 	case AC_FMT_BITS_16:
37 		fmt->bits = 16;
38 		break;
39 
40 	case AC_FMT_BITS_20:
41 		fmt->bits = 20;
42 		break;
43 
44 	case AC_FMT_BITS_24:
45 		fmt->bits = 24;
46 		break;
47 
48 	case AC_FMT_BITS_32:
49 		fmt->bits = 32;
50 		break;
51 
52 	default:
53 		bits = (format & AC_FMT_BITS_MASK) >> AC_FMT_BITS_SHIFT;
54 		WARN(1, "invalid number of bits: %#x\n", bits);
55 		fmt->bits = 8;
56 		break;
57 	}
58 
59 	channels = (format & AC_FMT_CHAN_MASK) >> AC_FMT_CHAN_SHIFT;
60 
61 	/* channels are encoded as n - 1 */
62 	fmt->channels = channels + 1;
63 }
64