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ALSA: dice, firewire-lib: add blocking mode

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Allow AMDTP output streams to use blocking mode.

Use it for DICE devices, because the old DICE-II chip will in some cases
not be able to lock to non-blocking streams (erratum E7).

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2011-09-04 22:12:48 +02:00
parent d13109673a
commit e84d15f619
3 changed files with 36 additions and 27 deletions
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54
sound/firewire/amdtp.c
View file

@ -42,9 +42,6 @@ static void pcm_period_tasklet(unsigned long data);
int amdtp_out_stream_init(struct amdtp_out_stream *s, struct fw_unit *unit,
enum cip_out_flags flags)
{
if (flags != CIP_NONBLOCKING)
return -EINVAL;
s->unit = fw_unit_get(unit);
s->flags = flags;
s->context = ERR_PTR(-1);
@ -96,12 +93,20 @@ void amdtp_out_stream_set_rate(struct amdtp_out_stream *s, unsigned int rate)
return;
for (sfc = 0; sfc < ARRAY_SIZE(rate_info); ++sfc)
if (rate_info[sfc].rate == rate) {
s->sfc = sfc;
s->syt_interval = rate_info[sfc].syt_interval;
return;
}
if (rate_info[sfc].rate == rate)
goto sfc_found;
WARN_ON(1);
return;
sfc_found:
s->sfc = sfc;
s->syt_interval = rate_info[sfc].syt_interval;
/* default buffering in the device */
s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE;
if (s->flags & CIP_BLOCKING)
/* additional buffering needed to adjust for no-data packets */
s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate;
}
EXPORT_SYMBOL(amdtp_out_stream_set_rate);
@ -110,25 +115,15 @@ EXPORT_SYMBOL(amdtp_out_stream_set_rate);
* @s: the AMDTP output stream
*
* This function must not be called before the stream has been configured
* with amdtp_out_stream_set_hw_params(), amdtp_out_stream_set_pcm(), and
* with amdtp_out_stream_set_rate(), amdtp_out_stream_set_pcm(), and
* amdtp_out_stream_set_midi().
*/
unsigned int amdtp_out_stream_get_max_payload(struct amdtp_out_stream *s)
{
static const unsigned int max_data_blocks[] = {
[CIP_SFC_32000] = 4,
[CIP_SFC_44100] = 6,
[CIP_SFC_48000] = 6,
[CIP_SFC_88200] = 12,
[CIP_SFC_96000] = 12,
[CIP_SFC_176400] = 23,
[CIP_SFC_192000] = 24,
};
s->data_block_quadlets = s->pcm_channels;
s->data_block_quadlets += DIV_ROUND_UP(s->midi_ports, 8);
return 8 + max_data_blocks[s->sfc] * 4 * s->data_block_quadlets;
return 8 + s->syt_interval * s->data_block_quadlets * 4;
}
EXPORT_SYMBOL(amdtp_out_stream_get_max_payload);
@ -248,7 +243,7 @@ static unsigned int calculate_syt(struct amdtp_out_stream *s,
s->last_syt_offset = syt_offset;
if (syt_offset < TICKS_PER_CYCLE) {
syt_offset += TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE;
syt_offset += s->transfer_delay;
syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12;
syt += syt_offset % TICKS_PER_CYCLE;
@ -344,8 +339,17 @@ static void queue_out_packet(struct amdtp_out_stream *s, unsigned int cycle)
return;
index = s->packet_index;
data_blocks = calculate_data_blocks(s);
syt = calculate_syt(s, cycle);
if (!(s->flags & CIP_BLOCKING)) {
data_blocks = calculate_data_blocks(s);
} else {
if (syt != 0xffff) {
data_blocks = s->syt_interval;
} else {
data_blocks = 0;
syt = 0xffffff;
}
}
buffer = s->buffer.packets[index].buffer;
buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) |
@ -455,9 +459,9 @@ static int queue_initial_skip_packets(struct amdtp_out_stream *s)
* @speed: firewire speed code
*
* The stream cannot be started until it has been configured with
* amdtp_out_stream_set_hw_params(), amdtp_out_stream_set_pcm(), and
* amdtp_out_stream_set_midi(); and it must be started before any
* PCM or MIDI device can be started.
* amdtp_out_stream_set_rate(), amdtp_out_stream_set_pcm(),
* amdtp_out_stream_set_midi(), and amdtp_out_stream_set_format();
* and it must be started before any PCM or MIDI device can be started.
*/
int amdtp_out_stream_start(struct amdtp_out_stream *s, int channel, int speed)
{

7
sound/firewire/amdtp.h
View file

@ -11,9 +11,13 @@
* sample_rate/8000 samples, with rounding up or down to adjust
* for clock skew and left-over fractional samples. This should
* be used if supported by the device.
* @CIP_BLOCKING: In blocking mode, each packet contains either zero or
* SYT_INTERVAL samples, with these two types alternating so that
* the overall sample rate comes out right.
*/
enum cip_out_flags {
CIP_NONBLOCKING = 0,
CIP_NONBLOCKING = 0x00,
CIP_BLOCKING = 0x01,
};
/**
@ -51,6 +55,7 @@ struct amdtp_out_stream {
__be32 *buffer, unsigned int frames);
unsigned int syt_interval;
unsigned int transfer_delay;
unsigned int source_node_id_field;
struct iso_packets_buffer buffer;

2
sound/firewire/dice.c
View file

@ -942,7 +942,7 @@ static int dice_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
goto err_notification_handler;
dice->resources.channels_mask = 0x00000000ffffffffuLL;
err = amdtp_out_stream_init(&dice->stream, unit, CIP_NONBLOCKING);
err = amdtp_out_stream_init(&dice->stream, unit, CIP_BLOCKING);
if (err < 0)
goto err_resources;