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![Takashi Sakamoto](/assets/img/avatar_default.png)
This commit takes ALSA fireface driver to perform sequence replay for media clock recovery. The protocol specific to RME Fireface series is not compliant to IEC 61883-1/6 since it has no CIP header, therefore presentation time is not used for media clock recovery. The sequence of the number of data blocks per packet is important. I note that the device skips an isochronous cycle corresponding to an empty packet or a NODATA packet in blocking transmission method of IEC 61883-1/6. For sequence replay, the cycle is handled as receiving an empty packet. Furthermore, it doesn't start packet transmission till receiving any packet. The sequence replay is tested with below models: * Fireface 400 * Fireface 800 * Fireface 802 I note that it is better to initialize Fireface 400 in advance by initialization transaction implemented in snd-fireface-ctl-service of snd-firewire-ctl-services project. You can see whether initialized or not by HOST LED on the device. Unless, the device often stops packet transmission even if session starts. I guess the sequence replay also works well with below models: * Fireface UFX * Fireface UCX Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20210531025103.17880-7-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
285 lines
6.2 KiB
C
285 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ff-stream.c - a part of driver for RME Fireface series
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*
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* Copyright (c) 2015-2017 Takashi Sakamoto
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*/
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#include "ff.h"
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#define READY_TIMEOUT_MS 200
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int snd_ff_stream_get_multiplier_mode(enum cip_sfc sfc,
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enum snd_ff_stream_mode *mode)
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{
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static const enum snd_ff_stream_mode modes[] = {
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[CIP_SFC_32000] = SND_FF_STREAM_MODE_LOW,
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[CIP_SFC_44100] = SND_FF_STREAM_MODE_LOW,
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[CIP_SFC_48000] = SND_FF_STREAM_MODE_LOW,
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[CIP_SFC_88200] = SND_FF_STREAM_MODE_MID,
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[CIP_SFC_96000] = SND_FF_STREAM_MODE_MID,
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[CIP_SFC_176400] = SND_FF_STREAM_MODE_HIGH,
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[CIP_SFC_192000] = SND_FF_STREAM_MODE_HIGH,
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};
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if (sfc >= CIP_SFC_COUNT)
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return -EINVAL;
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*mode = modes[sfc];
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return 0;
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}
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static inline void finish_session(struct snd_ff *ff)
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{
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ff->spec->protocol->finish_session(ff);
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ff->spec->protocol->switch_fetching_mode(ff, false);
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}
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static int init_stream(struct snd_ff *ff, 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 == &ff->tx_stream) {
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resources = &ff->tx_resources;
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dir = AMDTP_IN_STREAM;
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} else {
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resources = &ff->rx_resources;
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dir = AMDTP_OUT_STREAM;
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}
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err = fw_iso_resources_init(resources, ff->unit);
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if (err < 0)
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return err;
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err = amdtp_ff_init(s, ff->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_ff *ff, struct amdtp_stream *s)
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{
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amdtp_stream_destroy(s);
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if (s == &ff->tx_stream)
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fw_iso_resources_destroy(&ff->tx_resources);
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else
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fw_iso_resources_destroy(&ff->rx_resources);
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}
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int snd_ff_stream_init_duplex(struct snd_ff *ff)
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{
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int err;
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err = init_stream(ff, &ff->rx_stream);
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if (err < 0)
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return err;
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err = init_stream(ff, &ff->tx_stream);
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if (err < 0) {
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destroy_stream(ff, &ff->rx_stream);
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return err;
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}
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err = amdtp_domain_init(&ff->domain);
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if (err < 0) {
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destroy_stream(ff, &ff->rx_stream);
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destroy_stream(ff, &ff->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_ff_stream_destroy_duplex(struct snd_ff *ff)
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{
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amdtp_domain_destroy(&ff->domain);
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destroy_stream(ff, &ff->rx_stream);
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destroy_stream(ff, &ff->tx_stream);
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}
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int snd_ff_stream_reserve_duplex(struct snd_ff *ff, 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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enum snd_ff_clock_src src;
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int err;
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err = ff->spec->protocol->get_clock(ff, &curr_rate, &src);
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if (err < 0)
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return err;
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if (ff->substreams_counter == 0 || curr_rate != rate) {
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enum snd_ff_stream_mode mode;
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int i;
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amdtp_domain_stop(&ff->domain);
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finish_session(ff);
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fw_iso_resources_free(&ff->tx_resources);
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fw_iso_resources_free(&ff->rx_resources);
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for (i = 0; i < CIP_SFC_COUNT; ++i) {
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if (amdtp_rate_table[i] == rate)
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break;
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}
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if (i >= CIP_SFC_COUNT)
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return -EINVAL;
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err = snd_ff_stream_get_multiplier_mode(i, &mode);
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if (err < 0)
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return err;
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err = amdtp_ff_set_parameters(&ff->tx_stream, rate,
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ff->spec->pcm_capture_channels[mode]);
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if (err < 0)
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return err;
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err = amdtp_ff_set_parameters(&ff->rx_stream, rate,
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ff->spec->pcm_playback_channels[mode]);
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if (err < 0)
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return err;
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err = ff->spec->protocol->allocate_resources(ff, rate);
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if (err < 0)
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return err;
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err = amdtp_domain_set_events_per_period(&ff->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(&ff->tx_resources);
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fw_iso_resources_free(&ff->rx_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_ff_stream_start_duplex(struct snd_ff *ff, unsigned int rate)
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{
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int err;
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if (ff->substreams_counter == 0)
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return 0;
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if (amdtp_streaming_error(&ff->tx_stream) ||
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amdtp_streaming_error(&ff->rx_stream)) {
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amdtp_domain_stop(&ff->domain);
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finish_session(ff);
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}
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/*
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* Regardless of current source of clock signal, drivers transfer some
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* packets. Then, the device transfers packets.
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*/
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if (!amdtp_stream_running(&ff->rx_stream)) {
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int spd = fw_parent_device(ff->unit)->max_speed;
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err = ff->spec->protocol->begin_session(ff, rate);
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if (err < 0)
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goto error;
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err = amdtp_domain_add_stream(&ff->domain, &ff->rx_stream,
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ff->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(&ff->domain, &ff->tx_stream,
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ff->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 transfer packets unless receiving any packet. The
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// sequence of tx packets includes cycle skip corresponding to empty packet or
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// NODATA packet in IEC 61883-1/6. The sequence of the number of data blocks per
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// packet is important for media clock recovery.
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err = amdtp_domain_start(&ff->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(&ff->domain, READY_TIMEOUT_MS)) {
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err = -ETIMEDOUT;
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goto error;
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}
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err = ff->spec->protocol->switch_fetching_mode(ff, true);
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if (err < 0)
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goto error;
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}
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return 0;
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error:
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amdtp_domain_stop(&ff->domain);
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finish_session(ff);
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return err;
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}
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void snd_ff_stream_stop_duplex(struct snd_ff *ff)
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{
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if (ff->substreams_counter == 0) {
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amdtp_domain_stop(&ff->domain);
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finish_session(ff);
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fw_iso_resources_free(&ff->tx_resources);
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fw_iso_resources_free(&ff->rx_resources);
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}
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}
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void snd_ff_stream_update_duplex(struct snd_ff *ff)
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{
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amdtp_domain_stop(&ff->domain);
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// The device discontinue to transfer packets.
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amdtp_stream_pcm_abort(&ff->tx_stream);
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amdtp_stream_pcm_abort(&ff->rx_stream);
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}
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void snd_ff_stream_lock_changed(struct snd_ff *ff)
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{
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ff->dev_lock_changed = true;
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wake_up(&ff->hwdep_wait);
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}
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int snd_ff_stream_lock_try(struct snd_ff *ff)
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{
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int err;
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spin_lock_irq(&ff->lock);
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/* user land lock this */
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if (ff->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 (ff->dev_lock_count++ == 0)
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snd_ff_stream_lock_changed(ff);
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err = 0;
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end:
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spin_unlock_irq(&ff->lock);
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return err;
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}
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void snd_ff_stream_lock_release(struct snd_ff *ff)
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{
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spin_lock_irq(&ff->lock);
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if (WARN_ON(ff->dev_lock_count <= 0))
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goto end;
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if (--ff->dev_lock_count == 0)
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snd_ff_stream_lock_changed(ff);
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end:
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spin_unlock_irq(&ff->lock);
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}
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