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4267c5a8f3
The recent change for low latency playback works in most of test cases
but it turned out still to hit errors on some use cases, most notably
with JACK with small buffer sizes. This is because USB-audio driver
fills up and submits full URBs at the beginning, while the URBs would
return immediately and try to fill more -- that can easily trigger
XRUN. It was more or less expected, but in the small buffer size, the
problem became pretty obvious.
Fixing this behavior properly would require the change of the
fundamental driver design, so it's no trivial task, unfortunately.
Instead, here we work around the problem just by switching back to the
old method when the given configuration is too fragile with the low
latency stream handling. As a threshold, we calculate the total
buffer bytes in all plus one URBs, and check whether it's beyond the
PCM buffer bytes. The one extra URB is needed because XRUN happens at
the next submission after the first round.
Fixes: 307cc9baac ("ALSA: usb-audio: Reduce latency at playback start, take#2")
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210827203311.5987-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
205 lines
8.0 KiB
C
205 lines
8.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __USBAUDIO_CARD_H
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#define __USBAUDIO_CARD_H
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#define MAX_NR_RATES 1024
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#define MAX_PACKS 6 /* per URB */
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#define MAX_PACKS_HS (MAX_PACKS * 8) /* in high speed mode */
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#define MAX_URBS 12
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#define SYNC_URBS 4 /* always four urbs for sync */
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#define MAX_QUEUE 18 /* try not to exceed this queue length, in ms */
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struct audioformat {
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struct list_head list;
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u64 formats; /* ALSA format bits */
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unsigned int channels; /* # channels */
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unsigned int fmt_type; /* USB audio format type (1-3) */
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unsigned int fmt_bits; /* number of significant bits */
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unsigned int frame_size; /* samples per frame for non-audio */
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unsigned char iface; /* interface number */
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unsigned char altsetting; /* corresponding alternate setting */
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unsigned char ep_idx; /* endpoint array index */
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unsigned char altset_idx; /* array index of alternate setting */
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unsigned char attributes; /* corresponding attributes of cs endpoint */
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unsigned char endpoint; /* endpoint */
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unsigned char ep_attr; /* endpoint attributes */
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bool implicit_fb; /* implicit feedback endpoint */
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unsigned char sync_ep; /* sync endpoint number */
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unsigned char sync_iface; /* sync EP interface */
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unsigned char sync_altsetting; /* sync EP alternate setting */
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unsigned char sync_ep_idx; /* sync EP array index */
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unsigned char datainterval; /* log_2 of data packet interval */
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unsigned char protocol; /* UAC_VERSION_1/2/3 */
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unsigned int maxpacksize; /* max. packet size */
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unsigned int rates; /* rate bitmasks */
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unsigned int rate_min, rate_max; /* min/max rates */
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unsigned int nr_rates; /* number of rate table entries */
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unsigned int *rate_table; /* rate table */
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unsigned char clock; /* associated clock */
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struct snd_pcm_chmap_elem *chmap; /* (optional) channel map */
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bool dsd_dop; /* add DOP headers in case of DSD samples */
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bool dsd_bitrev; /* reverse the bits of each DSD sample */
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bool dsd_raw; /* altsetting is raw DSD */
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};
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struct snd_usb_substream;
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struct snd_usb_iface_ref;
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struct snd_usb_endpoint;
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struct snd_usb_power_domain;
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struct snd_urb_ctx {
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struct urb *urb;
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unsigned int buffer_size; /* size of data buffer, if data URB */
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struct snd_usb_substream *subs;
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struct snd_usb_endpoint *ep;
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int index; /* index for urb array */
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int packets; /* number of packets per urb */
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int queued; /* queued data bytes by this urb */
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int packet_size[MAX_PACKS_HS]; /* size of packets for next submission */
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struct list_head ready_list;
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};
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struct snd_usb_endpoint {
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struct snd_usb_audio *chip;
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struct snd_usb_iface_ref *iface_ref;
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int opened; /* open refcount; protect with chip->mutex */
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atomic_t running; /* running status */
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int ep_num; /* the referenced endpoint number */
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int type; /* SND_USB_ENDPOINT_TYPE_* */
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unsigned char iface; /* interface number */
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unsigned char altsetting; /* corresponding alternate setting */
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unsigned char ep_idx; /* endpoint array index */
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atomic_t state; /* running state */
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void (*prepare_data_urb) (struct snd_usb_substream *subs,
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struct urb *urb);
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void (*retire_data_urb) (struct snd_usb_substream *subs,
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struct urb *urb);
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struct snd_usb_substream *data_subs;
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struct snd_usb_endpoint *sync_source;
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struct snd_usb_endpoint *sync_sink;
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struct snd_urb_ctx urb[MAX_URBS];
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struct snd_usb_packet_info {
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uint32_t packet_size[MAX_PACKS_HS];
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int packets;
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} next_packet[MAX_URBS];
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unsigned int next_packet_head; /* ring buffer offset to read */
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unsigned int next_packet_queued; /* queued items in the ring buffer */
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struct list_head ready_playback_urbs; /* playback URB FIFO for implicit fb */
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unsigned int nurbs; /* # urbs */
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unsigned int nominal_queue_size; /* total buffer sizes in URBs */
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unsigned long active_mask; /* bitmask of active urbs */
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unsigned long unlink_mask; /* bitmask of unlinked urbs */
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char *syncbuf; /* sync buffer for all sync URBs */
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dma_addr_t sync_dma; /* DMA address of syncbuf */
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unsigned int pipe; /* the data i/o pipe */
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unsigned int packsize[2]; /* small/large packet sizes in samples */
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unsigned int sample_rem; /* remainder from division fs/pps */
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unsigned int sample_accum; /* sample accumulator */
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unsigned int pps; /* packets per second */
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unsigned int freqn; /* nominal sampling rate in fs/fps in Q16.16 format */
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unsigned int freqm; /* momentary sampling rate in fs/fps in Q16.16 format */
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int freqshift; /* how much to shift the feedback value to get Q16.16 */
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unsigned int freqmax; /* maximum sampling rate, used for buffer management */
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unsigned int phase; /* phase accumulator */
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unsigned int maxpacksize; /* max packet size in bytes */
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unsigned int maxframesize; /* max packet size in frames */
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unsigned int max_urb_frames; /* max URB size in frames */
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unsigned int curpacksize; /* current packet size in bytes (for capture) */
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unsigned int curframesize; /* current packet size in frames (for capture) */
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unsigned int syncmaxsize; /* sync endpoint packet size */
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unsigned int fill_max:1; /* fill max packet size always */
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unsigned int tenor_fb_quirk:1; /* corrupted feedback data */
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unsigned int datainterval; /* log_2 of data packet interval */
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unsigned int syncinterval; /* P for adaptive mode, 0 otherwise */
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unsigned char silence_value;
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unsigned int stride;
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int skip_packets; /* quirks for devices to ignore the first n packets
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in a stream */
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bool implicit_fb_sync; /* syncs with implicit feedback */
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bool need_setup; /* (re-)need for configure? */
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/* for hw constraints */
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const struct audioformat *cur_audiofmt;
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unsigned int cur_rate;
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snd_pcm_format_t cur_format;
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unsigned int cur_channels;
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unsigned int cur_frame_bytes;
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unsigned int cur_period_frames;
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unsigned int cur_period_bytes;
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unsigned int cur_buffer_periods;
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spinlock_t lock;
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struct list_head list;
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};
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struct media_ctl;
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struct snd_usb_substream {
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struct snd_usb_stream *stream;
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struct usb_device *dev;
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struct snd_pcm_substream *pcm_substream;
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int direction; /* playback or capture */
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int endpoint; /* assigned endpoint */
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const struct audioformat *cur_audiofmt; /* current audioformat pointer (for hw_params callback) */
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struct snd_usb_power_domain *str_pd; /* UAC3 Power Domain for streaming path */
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unsigned int channels_max; /* max channels in the all audiofmts */
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unsigned int txfr_quirk:1; /* allow sub-frame alignment */
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unsigned int tx_length_quirk:1; /* add length specifier to transfers */
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unsigned int fmt_type; /* USB audio format type (1-3) */
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unsigned int pkt_offset_adj; /* Bytes to drop from beginning of packets (for non-compliant devices) */
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unsigned int stream_offset_adj; /* Bytes to drop from beginning of stream (for non-compliant devices) */
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unsigned int running: 1; /* running status */
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unsigned int period_elapsed_pending; /* delay period handling */
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unsigned int buffer_bytes; /* buffer size in bytes */
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unsigned int inflight_bytes; /* in-flight data bytes on buffer (for playback) */
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unsigned int hwptr_done; /* processed byte position in the buffer */
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unsigned int transfer_done; /* processed frames since last period update */
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unsigned int frame_limit; /* limits number of packets in URB */
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/* data and sync endpoints for this stream */
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unsigned int ep_num; /* the endpoint number */
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struct snd_usb_endpoint *data_endpoint;
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struct snd_usb_endpoint *sync_endpoint;
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unsigned long flags;
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unsigned int speed; /* USB_SPEED_XXX */
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u64 formats; /* format bitmasks (all or'ed) */
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unsigned int num_formats; /* number of supported audio formats (list) */
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struct list_head fmt_list; /* format list */
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spinlock_t lock;
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unsigned int last_frame_number; /* stored frame number */
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struct {
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int marker;
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int channel;
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int byte_idx;
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} dsd_dop;
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bool trigger_tstamp_pending_update; /* trigger timestamp being updated from initial estimate */
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bool early_playback_start; /* early start needed for playback? */
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struct media_ctl *media_ctl;
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};
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struct snd_usb_stream {
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struct snd_usb_audio *chip;
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struct snd_pcm *pcm;
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int pcm_index;
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unsigned int fmt_type; /* USB audio format type (1-3) */
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struct snd_usb_substream substream[2];
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struct list_head list;
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};
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#endif /* __USBAUDIO_CARD_H */
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