summaryrefslogtreecommitdiff
path: root/sound/firewire
diff options
context:
space:
mode:
authorClemens Ladisch <clemens@ladisch.de>2011-09-04 22:12:48 +0200
committerClemens Ladisch <clemens@ladisch.de>2013-10-20 22:07:57 +0200
commite84d15f619c13e83b33023c84527ee35ef01b6b4 (patch)
treea5d06e046895ebc5a14d06c93fdd4f39eb7c840a /sound/firewire
parentd13109673ac49cd4b992df17238ee030be7ed7f0 (diff)
ALSA: dice, firewire-lib: add blocking mode
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>
Diffstat (limited to 'sound/firewire')
-rw-r--r--sound/firewire/amdtp.c54
-rw-r--r--sound/firewire/amdtp.h7
-rw-r--r--sound/firewire/dice.c2
3 files changed, 36 insertions, 27 deletions
diff --git a/sound/firewire/amdtp.c b/sound/firewire/amdtp.c
index ea995af6d049..efb2e2947ce7 100644
--- a/sound/firewire/amdtp.c
+++ b/sound/firewire/amdtp.c
@@ -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)
{
diff --git a/sound/firewire/amdtp.h b/sound/firewire/amdtp.h
index f6103d68c4b1..fd4ce3030279 100644
--- a/sound/firewire/amdtp.h
+++ b/sound/firewire/amdtp.h
@@ -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;
diff --git a/sound/firewire/dice.c b/sound/firewire/dice.c
index 02c7b5a42373..63446f86cdd7 100644
--- a/sound/firewire/dice.c
+++ b/sound/firewire/dice.c
@@ -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;