LXR linux/drivers/gpu/drm/tegra/hda.c

   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
  12void 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