forked from mirrors/linux
fad7b80643
This code can be reused for HDMI, so extract it into a reusable function. Signed-off-by: Thierry Reding <treding@nvidia.com>
63 lines
1.1 KiB
C
63 lines
1.1 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright (C) 2019 NVIDIA Corporation
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*/
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#include <linux/bug.h>
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#include <sound/hda_verbs.h>
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#include "hda.h"
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void tegra_hda_parse_format(unsigned int format, struct tegra_hda_format *fmt)
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{
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unsigned int mul, div, bits, channels;
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if (format & AC_FMT_TYPE_NON_PCM)
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fmt->pcm = false;
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else
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fmt->pcm = true;
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if (format & AC_FMT_BASE_44K)
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fmt->sample_rate = 44100;
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else
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fmt->sample_rate = 48000;
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mul = (format & AC_FMT_MULT_MASK) >> AC_FMT_MULT_SHIFT;
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div = (format & AC_FMT_DIV_MASK) >> AC_FMT_DIV_SHIFT;
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fmt->sample_rate *= (mul + 1) / (div + 1);
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switch (format & AC_FMT_BITS_MASK) {
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case AC_FMT_BITS_8:
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fmt->bits = 8;
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break;
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case AC_FMT_BITS_16:
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fmt->bits = 16;
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break;
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case AC_FMT_BITS_20:
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fmt->bits = 20;
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break;
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case AC_FMT_BITS_24:
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fmt->bits = 24;
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break;
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case AC_FMT_BITS_32:
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fmt->bits = 32;
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break;
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default:
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bits = (format & AC_FMT_BITS_MASK) >> AC_FMT_BITS_SHIFT;
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WARN(1, "invalid number of bits: %#x\n", bits);
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fmt->bits = 8;
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break;
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}
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channels = (format & AC_FMT_CHAN_MASK) >> AC_FMT_CHAN_SHIFT;
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/* channels are encoded as n - 1 */
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fmt->channels = channels + 1;
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}
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