root/drivers/gpu/drm/tegra/hda.c

DEFINITIONS

1. tegra_hda_parse_format

   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 
  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 }