460 lines
10 KiB
C
460 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* digi00x-stream.c - a part of driver for Digidesign Digi 002/003 family
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*
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* Copyright (c) 2014-2015 Takashi Sakamoto
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*/
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#include "digi00x.h"
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#define READY_TIMEOUT_MS 200
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const unsigned int snd_dg00x_stream_rates[SND_DG00X_RATE_COUNT] = {
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[SND_DG00X_RATE_44100] = 44100,
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[SND_DG00X_RATE_48000] = 48000,
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[SND_DG00X_RATE_88200] = 88200,
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[SND_DG00X_RATE_96000] = 96000,
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};
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/* Multi Bit Linear Audio data channels for each sampling transfer frequency. */
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const unsigned int
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snd_dg00x_stream_pcm_channels[SND_DG00X_RATE_COUNT] = {
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/* Analog/ADAT/SPDIF */
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[SND_DG00X_RATE_44100] = (8 + 8 + 2),
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[SND_DG00X_RATE_48000] = (8 + 8 + 2),
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/* Analog/SPDIF */
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[SND_DG00X_RATE_88200] = (8 + 2),
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[SND_DG00X_RATE_96000] = (8 + 2),
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};
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int snd_dg00x_stream_get_local_rate(struct snd_dg00x *dg00x, unsigned int *rate)
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{
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u32 data;
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__be32 reg;
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int err;
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err = snd_fw_transaction(dg00x->unit, TCODE_READ_QUADLET_REQUEST,
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DG00X_ADDR_BASE + DG00X_OFFSET_LOCAL_RATE,
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®, sizeof(reg), 0);
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if (err < 0)
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return err;
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data = be32_to_cpu(reg) & 0x0f;
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if (data < ARRAY_SIZE(snd_dg00x_stream_rates))
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*rate = snd_dg00x_stream_rates[data];
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else
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err = -EIO;
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return err;
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}
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int snd_dg00x_stream_set_local_rate(struct snd_dg00x *dg00x, unsigned int rate)
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{
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__be32 reg;
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(snd_dg00x_stream_rates); i++) {
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if (rate == snd_dg00x_stream_rates[i])
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break;
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}
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if (i == ARRAY_SIZE(snd_dg00x_stream_rates))
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return -EINVAL;
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reg = cpu_to_be32(i);
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return snd_fw_transaction(dg00x->unit, TCODE_WRITE_QUADLET_REQUEST,
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DG00X_ADDR_BASE + DG00X_OFFSET_LOCAL_RATE,
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®, sizeof(reg), 0);
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}
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int snd_dg00x_stream_get_clock(struct snd_dg00x *dg00x,
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enum snd_dg00x_clock *clock)
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{
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__be32 reg;
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int err;
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err = snd_fw_transaction(dg00x->unit, TCODE_READ_QUADLET_REQUEST,
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DG00X_ADDR_BASE + DG00X_OFFSET_CLOCK_SOURCE,
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®, sizeof(reg), 0);
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if (err < 0)
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return err;
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*clock = be32_to_cpu(reg) & 0x0f;
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if (*clock >= SND_DG00X_CLOCK_COUNT)
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err = -EIO;
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return err;
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}
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int snd_dg00x_stream_check_external_clock(struct snd_dg00x *dg00x, bool *detect)
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{
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__be32 reg;
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int err;
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err = snd_fw_transaction(dg00x->unit, TCODE_READ_QUADLET_REQUEST,
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DG00X_ADDR_BASE + DG00X_OFFSET_DETECT_EXTERNAL,
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®, sizeof(reg), 0);
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if (err >= 0)
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*detect = be32_to_cpu(reg) > 0;
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return err;
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}
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int snd_dg00x_stream_get_external_rate(struct snd_dg00x *dg00x,
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unsigned int *rate)
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{
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u32 data;
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__be32 reg;
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int err;
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err = snd_fw_transaction(dg00x->unit, TCODE_READ_QUADLET_REQUEST,
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DG00X_ADDR_BASE + DG00X_OFFSET_EXTERNAL_RATE,
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®, sizeof(reg), 0);
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if (err < 0)
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return err;
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data = be32_to_cpu(reg) & 0x0f;
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if (data < ARRAY_SIZE(snd_dg00x_stream_rates))
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*rate = snd_dg00x_stream_rates[data];
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/* This means desync. */
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else
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err = -EBUSY;
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return err;
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}
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static void finish_session(struct snd_dg00x *dg00x)
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{
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__be32 data;
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data = cpu_to_be32(0x00000003);
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snd_fw_transaction(dg00x->unit, TCODE_WRITE_QUADLET_REQUEST,
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DG00X_ADDR_BASE + DG00X_OFFSET_STREAMING_SET,
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&data, sizeof(data), 0);
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// Unregister isochronous channels for both direction.
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data = 0;
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snd_fw_transaction(dg00x->unit, TCODE_WRITE_QUADLET_REQUEST,
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DG00X_ADDR_BASE + DG00X_OFFSET_ISOC_CHANNELS,
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&data, sizeof(data), 0);
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// Just after finishing the session, the device may lost transmitting
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// functionality for a short time.
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msleep(50);
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}
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static int begin_session(struct snd_dg00x *dg00x)
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{
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__be32 data;
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u32 curr;
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int err;
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// Register isochronous channels for both direction.
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data = cpu_to_be32((dg00x->tx_resources.channel << 16) |
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dg00x->rx_resources.channel);
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err = snd_fw_transaction(dg00x->unit, TCODE_WRITE_QUADLET_REQUEST,
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DG00X_ADDR_BASE + DG00X_OFFSET_ISOC_CHANNELS,
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&data, sizeof(data), 0);
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if (err < 0)
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return err;
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err = snd_fw_transaction(dg00x->unit, TCODE_READ_QUADLET_REQUEST,
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DG00X_ADDR_BASE + DG00X_OFFSET_STREAMING_STATE,
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&data, sizeof(data), 0);
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if (err < 0)
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return err;
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curr = be32_to_cpu(data);
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if (curr == 0)
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curr = 2;
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curr--;
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while (curr > 0) {
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data = cpu_to_be32(curr);
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err = snd_fw_transaction(dg00x->unit,
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TCODE_WRITE_QUADLET_REQUEST,
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DG00X_ADDR_BASE +
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DG00X_OFFSET_STREAMING_SET,
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&data, sizeof(data), 0);
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if (err < 0)
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break;
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msleep(20);
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curr--;
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}
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return err;
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}
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static int keep_resources(struct snd_dg00x *dg00x, struct amdtp_stream *stream,
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unsigned int rate)
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{
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struct fw_iso_resources *resources;
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int i;
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int err;
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// Check sampling rate.
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for (i = 0; i < SND_DG00X_RATE_COUNT; i++) {
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if (snd_dg00x_stream_rates[i] == rate)
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break;
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}
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if (i == SND_DG00X_RATE_COUNT)
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return -EINVAL;
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if (stream == &dg00x->tx_stream)
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resources = &dg00x->tx_resources;
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else
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resources = &dg00x->rx_resources;
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err = amdtp_dot_set_parameters(stream, rate,
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snd_dg00x_stream_pcm_channels[i]);
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if (err < 0)
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return err;
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return fw_iso_resources_allocate(resources,
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amdtp_stream_get_max_payload(stream),
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fw_parent_device(dg00x->unit)->max_speed);
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}
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static int init_stream(struct snd_dg00x *dg00x, struct amdtp_stream *s)
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{
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struct fw_iso_resources *resources;
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enum amdtp_stream_direction dir;
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int err;
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if (s == &dg00x->tx_stream) {
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resources = &dg00x->tx_resources;
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dir = AMDTP_IN_STREAM;
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} else {
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resources = &dg00x->rx_resources;
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dir = AMDTP_OUT_STREAM;
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}
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err = fw_iso_resources_init(resources, dg00x->unit);
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if (err < 0)
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return err;
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err = amdtp_dot_init(s, dg00x->unit, dir);
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if (err < 0)
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fw_iso_resources_destroy(resources);
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return err;
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}
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static void destroy_stream(struct snd_dg00x *dg00x, struct amdtp_stream *s)
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{
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amdtp_stream_destroy(s);
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if (s == &dg00x->tx_stream)
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fw_iso_resources_destroy(&dg00x->tx_resources);
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else
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fw_iso_resources_destroy(&dg00x->rx_resources);
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}
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int snd_dg00x_stream_init_duplex(struct snd_dg00x *dg00x)
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{
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int err;
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err = init_stream(dg00x, &dg00x->rx_stream);
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if (err < 0)
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return err;
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err = init_stream(dg00x, &dg00x->tx_stream);
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if (err < 0) {
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destroy_stream(dg00x, &dg00x->rx_stream);
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return err;
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}
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err = amdtp_domain_init(&dg00x->domain);
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if (err < 0) {
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destroy_stream(dg00x, &dg00x->rx_stream);
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destroy_stream(dg00x, &dg00x->tx_stream);
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}
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return err;
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}
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/*
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* This function should be called before starting streams or after stopping
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* streams.
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*/
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void snd_dg00x_stream_destroy_duplex(struct snd_dg00x *dg00x)
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{
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amdtp_domain_destroy(&dg00x->domain);
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destroy_stream(dg00x, &dg00x->rx_stream);
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destroy_stream(dg00x, &dg00x->tx_stream);
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}
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int snd_dg00x_stream_reserve_duplex(struct snd_dg00x *dg00x, unsigned int rate,
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unsigned int frames_per_period,
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unsigned int frames_per_buffer)
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{
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unsigned int curr_rate;
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int err;
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err = snd_dg00x_stream_get_local_rate(dg00x, &curr_rate);
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if (err < 0)
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return err;
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if (rate == 0)
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rate = curr_rate;
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if (dg00x->substreams_counter == 0 || curr_rate != rate) {
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amdtp_domain_stop(&dg00x->domain);
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finish_session(dg00x);
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fw_iso_resources_free(&dg00x->tx_resources);
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fw_iso_resources_free(&dg00x->rx_resources);
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err = snd_dg00x_stream_set_local_rate(dg00x, rate);
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if (err < 0)
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return err;
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err = keep_resources(dg00x, &dg00x->rx_stream, rate);
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if (err < 0)
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return err;
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err = keep_resources(dg00x, &dg00x->tx_stream, rate);
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if (err < 0) {
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fw_iso_resources_free(&dg00x->rx_resources);
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return err;
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}
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err = amdtp_domain_set_events_per_period(&dg00x->domain,
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frames_per_period, frames_per_buffer);
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if (err < 0) {
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fw_iso_resources_free(&dg00x->rx_resources);
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fw_iso_resources_free(&dg00x->tx_resources);
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return err;
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}
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}
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return 0;
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}
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int snd_dg00x_stream_start_duplex(struct snd_dg00x *dg00x)
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{
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unsigned int generation = dg00x->rx_resources.generation;
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int err = 0;
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if (dg00x->substreams_counter == 0)
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return 0;
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if (amdtp_streaming_error(&dg00x->tx_stream) ||
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amdtp_streaming_error(&dg00x->rx_stream)) {
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amdtp_domain_stop(&dg00x->domain);
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finish_session(dg00x);
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}
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if (generation != fw_parent_device(dg00x->unit)->card->generation) {
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err = fw_iso_resources_update(&dg00x->tx_resources);
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if (err < 0)
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goto error;
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err = fw_iso_resources_update(&dg00x->rx_resources);
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if (err < 0)
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goto error;
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}
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/*
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* No packets are transmitted without receiving packets, reagardless of
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* which source of clock is used.
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*/
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if (!amdtp_stream_running(&dg00x->rx_stream)) {
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int spd = fw_parent_device(dg00x->unit)->max_speed;
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err = begin_session(dg00x);
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if (err < 0)
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goto error;
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err = amdtp_domain_add_stream(&dg00x->domain, &dg00x->rx_stream,
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dg00x->rx_resources.channel, spd);
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if (err < 0)
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goto error;
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err = amdtp_domain_add_stream(&dg00x->domain, &dg00x->tx_stream,
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dg00x->tx_resources.channel, spd);
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if (err < 0)
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goto error;
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// NOTE: The device doesn't start packet transmission till receiving any packet.
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// It ignores presentation time expressed by the value of syt field of CIP header
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// in received packets. The sequence of the number of data blocks per packet is
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// important for media clock recovery.
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err = amdtp_domain_start(&dg00x->domain, 0, true, true);
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if (err < 0)
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goto error;
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if (!amdtp_domain_wait_ready(&dg00x->domain, READY_TIMEOUT_MS)) {
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err = -ETIMEDOUT;
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goto error;
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}
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}
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return 0;
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error:
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amdtp_domain_stop(&dg00x->domain);
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finish_session(dg00x);
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return err;
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}
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void snd_dg00x_stream_stop_duplex(struct snd_dg00x *dg00x)
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{
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if (dg00x->substreams_counter == 0) {
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amdtp_domain_stop(&dg00x->domain);
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finish_session(dg00x);
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fw_iso_resources_free(&dg00x->tx_resources);
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fw_iso_resources_free(&dg00x->rx_resources);
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}
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}
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void snd_dg00x_stream_update_duplex(struct snd_dg00x *dg00x)
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{
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fw_iso_resources_update(&dg00x->tx_resources);
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fw_iso_resources_update(&dg00x->rx_resources);
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amdtp_stream_update(&dg00x->tx_stream);
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amdtp_stream_update(&dg00x->rx_stream);
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}
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void snd_dg00x_stream_lock_changed(struct snd_dg00x *dg00x)
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{
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dg00x->dev_lock_changed = true;
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wake_up(&dg00x->hwdep_wait);
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}
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int snd_dg00x_stream_lock_try(struct snd_dg00x *dg00x)
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{
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int err;
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spin_lock_irq(&dg00x->lock);
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/* user land lock this */
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if (dg00x->dev_lock_count < 0) {
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err = -EBUSY;
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goto end;
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}
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/* this is the first time */
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if (dg00x->dev_lock_count++ == 0)
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snd_dg00x_stream_lock_changed(dg00x);
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err = 0;
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end:
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spin_unlock_irq(&dg00x->lock);
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return err;
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}
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void snd_dg00x_stream_lock_release(struct snd_dg00x *dg00x)
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{
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spin_lock_irq(&dg00x->lock);
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if (WARN_ON(dg00x->dev_lock_count <= 0))
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goto end;
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if (--dg00x->dev_lock_count == 0)
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snd_dg00x_stream_lock_changed(dg00x);
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end:
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spin_unlock_irq(&dg00x->lock);
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}
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