diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-4.19/950-0391-staging-bcm2835-audio-Operate-non-atomic-PCM-ops.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-4.19/950-0391-staging-bcm2835-audio-Operate-non-atomic-PCM-ops.patch | 593 |
1 files changed, 593 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0391-staging-bcm2835-audio-Operate-non-atomic-PCM-ops.patch b/target/linux/bcm27xx/patches-4.19/950-0391-staging-bcm2835-audio-Operate-non-atomic-PCM-ops.patch new file mode 100644 index 0000000000..722804ff63 --- /dev/null +++ b/target/linux/bcm27xx/patches-4.19/950-0391-staging-bcm2835-audio-Operate-non-atomic-PCM-ops.patch @@ -0,0 +1,593 @@ +From 87ba8310e9f0882e85926ac1ef91333f8906b303 Mon Sep 17 00:00:00 2001 +From: Takashi Iwai <tiwai@suse.de> +Date: Tue, 4 Sep 2018 17:58:49 +0200 +Subject: [PATCH] staging: bcm2835-audio: Operate non-atomic PCM ops + +commit 5c7883e5f27e829f3f3a2ba174d4a724bfd5f026 upstream. + +This is the most significant part in the patch series. + +The bcm2835-audio driver used to queue the commands to vc04 core via +workqueue, but basically the whole accesses to vc04 core are done in +the sleepable context, including the callback calls. In such a case, +rewriting the code using non-atomic PCM ops will simplify the logic a +lot. + +This patch does it: all workqueue are gone and each former-work +implementation is now directly called from PCM ops like trigger and +write transfer. + +Along with it, the DMA position updater, bcm2835_playback_fifo(), was +also rewritten to use a simpler logic. Now it handles the XRUN and +draining properly by calling snd_pcm_stop() conditionally. + +The current position is kept in atomic_t value so that it can be read +concurrently from the pointer callback. + +Also, the bcm2835_audio_instance object is allocated at the beginning +of bcm2835_audio_open(). This makes the resource management clearer. + +Signed-off-by: Takashi Iwai <tiwai@suse.de> +Tested-by: Stefan Wahren <stefan.wahren@i2se.com> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + .../vc04_services/bcm2835-audio/bcm2835-pcm.c | 74 +++--- + .../bcm2835-audio/bcm2835-vchiq.c | 244 +++--------------- + .../vc04_services/bcm2835-audio/bcm2835.h | 9 +- + 3 files changed, 82 insertions(+), 245 deletions(-) + +--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c ++++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c +@@ -11,7 +11,8 @@ + /* hardware definition */ + static const struct snd_pcm_hardware snd_bcm2835_playback_hw = { + .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | +- SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID), ++ SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | ++ SNDRV_PCM_INFO_DRAIN_TRIGGER), + .formats = SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE, + .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000, + .rate_min = 8000, +@@ -27,7 +28,8 @@ static const struct snd_pcm_hardware snd + + static const struct snd_pcm_hardware snd_bcm2835_playback_spdif_hw = { + .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | +- SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID), ++ SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | ++ SNDRV_PCM_INFO_DRAIN_TRIGGER), + .formats = SNDRV_PCM_FMTBIT_S16_LE, + .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_44100 | + SNDRV_PCM_RATE_48000, +@@ -47,42 +49,34 @@ static void snd_bcm2835_playback_free(st + kfree(runtime->private_data); + } + +-void bcm2835_playback_fifo(struct bcm2835_alsa_stream *alsa_stream) ++void bcm2835_playback_fifo(struct bcm2835_alsa_stream *alsa_stream, ++ unsigned int bytes) + { +- unsigned int consumed = 0; +- int new_period = 0; ++ struct snd_pcm_substream *substream = alsa_stream->substream; ++ unsigned int pos; + +- audio_info("alsa_stream=%p substream=%p\n", alsa_stream, +- alsa_stream ? alsa_stream->substream : 0); ++ if (!alsa_stream->period_size) ++ return; + +- consumed = bcm2835_audio_retrieve_buffers(alsa_stream); +- +- /* We get called only if playback was triggered, So, the number of buffers we retrieve in +- * each iteration are the buffers that have been played out already +- */ +- +- if (alsa_stream->period_size) { +- if ((alsa_stream->pos / alsa_stream->period_size) != +- ((alsa_stream->pos + consumed) / alsa_stream->period_size)) +- new_period = 1; +- } +- audio_debug("updating pos cur: %d + %d max:%d period_bytes:%d, hw_ptr: %d new_period:%d\n", +- alsa_stream->pos, +- consumed, +- alsa_stream->buffer_size, +- (int) (alsa_stream->period_size * alsa_stream->substream->runtime->periods), +- frames_to_bytes(alsa_stream->substream->runtime, alsa_stream->substream->runtime->status->hw_ptr), +- new_period); +- if (alsa_stream->buffer_size) { +- alsa_stream->pos += consumed & ~(1 << 30); +- alsa_stream->pos %= alsa_stream->buffer_size; ++ if (bytes >= alsa_stream->buffer_size) { ++ snd_pcm_stream_lock(substream); ++ snd_pcm_stop(substream, ++ alsa_stream->draining ? ++ SNDRV_PCM_STATE_SETUP : ++ SNDRV_PCM_STATE_XRUN); ++ snd_pcm_stream_unlock(substream); ++ return; + } + +- if (alsa_stream->substream) { +- if (new_period) +- snd_pcm_period_elapsed(alsa_stream->substream); +- } else { +- audio_warning(" unexpected NULL substream\n"); ++ pos = atomic_read(&alsa_stream->pos); ++ pos += bytes; ++ pos %= alsa_stream->buffer_size; ++ atomic_set(&alsa_stream->pos, pos); ++ ++ alsa_stream->period_offset += bytes; ++ if (alsa_stream->period_offset >= alsa_stream->period_size) { ++ alsa_stream->period_offset %= alsa_stream->period_size; ++ snd_pcm_period_elapsed(substream); + } + } + +@@ -246,7 +240,8 @@ static int snd_bcm2835_pcm_prepare(struc + + alsa_stream->buffer_size = snd_pcm_lib_buffer_bytes(substream); + alsa_stream->period_size = snd_pcm_lib_period_bytes(substream); +- alsa_stream->pos = 0; ++ atomic_set(&alsa_stream->pos, 0); ++ alsa_stream->period_offset = 0; + alsa_stream->draining = false; + + return 0; +@@ -283,7 +278,7 @@ static int snd_bcm2835_pcm_trigger(struc + return bcm2835_audio_start(alsa_stream); + case SNDRV_PCM_TRIGGER_DRAIN: + alsa_stream->draining = true; +- return 0; ++ return bcm2835_audio_drain(alsa_stream); + case SNDRV_PCM_TRIGGER_STOP: + return bcm2835_audio_stop(alsa_stream); + default: +@@ -300,7 +295,7 @@ snd_bcm2835_pcm_pointer(struct snd_pcm_s + + return snd_pcm_indirect_playback_pointer(substream, + &alsa_stream->pcm_indirect, +- alsa_stream->pos); ++ atomic_read(&alsa_stream->pos)); + } + + /* operators */ +@@ -338,6 +333,7 @@ int snd_bcm2835_new_pcm(struct bcm2835_c + if (err < 0) + return err; + pcm->private_data = chip; ++ pcm->nonatomic = true; + strcpy(pcm->name, "bcm2835 ALSA"); + chip->pcm = pcm; + chip->dest = AUDIO_DEST_AUTO; +@@ -367,6 +363,7 @@ int snd_bcm2835_new_spdif_pcm(struct bcm + return err; + + pcm->private_data = chip; ++ pcm->nonatomic = true; + strcpy(pcm->name, "bcm2835 IEC958/HDMI"); + chip->pcm_spdif = pcm; + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, +@@ -395,6 +392,7 @@ int snd_bcm2835_new_simple_pcm(struct bc + return err; + + pcm->private_data = chip; ++ pcm->nonatomic = true; + strcpy(pcm->name, name); + chip->pcm = pcm; + chip->dest = route; +--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c ++++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c +@@ -26,10 +26,6 @@ + + /* ---- Private Constants and Types ------------------------------------------ */ + +-#define BCM2835_AUDIO_STOP 0 +-#define BCM2835_AUDIO_START 1 +-#define BCM2835_AUDIO_WRITE 2 +- + /* Logging macros (for remapping to other logging mechanisms, i.e., printf) */ + #ifdef AUDIO_DEBUG_ENABLE + #define LOG_ERR(fmt, arg...) pr_err("%s:%d " fmt, __func__, __LINE__, ##arg) +@@ -55,17 +51,6 @@ struct bcm2835_audio_instance { + + static bool force_bulk; + +-/* ---- Private Variables ---------------------------------------------------- */ +- +-/* ---- Private Function Prototypes ------------------------------------------ */ +- +-/* ---- Private Functions ---------------------------------------------------- */ +- +-static int bcm2835_audio_stop_worker(struct bcm2835_alsa_stream *alsa_stream); +-static int bcm2835_audio_start_worker(struct bcm2835_alsa_stream *alsa_stream); +-static int bcm2835_audio_write_worker(struct bcm2835_alsa_stream *alsa_stream, +- unsigned int count, void *src); +- + static void bcm2835_audio_lock(struct bcm2835_audio_instance *instance) + { + mutex_lock(&instance->vchi_mutex); +@@ -135,108 +120,6 @@ static const u32 BCM2835_AUDIO_WRITE_COO + static const u32 BCM2835_AUDIO_WRITE_COOKIE2 = ('D' << 24 | 'A' << 16 | + 'T' << 8 | 'A'); + +-struct bcm2835_audio_work { +- struct work_struct my_work; +- struct bcm2835_alsa_stream *alsa_stream; +- int cmd; +- void *src; +- unsigned int count; +-}; +- +-static void my_wq_function(struct work_struct *work) +-{ +- struct bcm2835_audio_work *w = +- container_of(work, struct bcm2835_audio_work, my_work); +- int ret = -9; +- +- switch (w->cmd) { +- case BCM2835_AUDIO_START: +- ret = bcm2835_audio_start_worker(w->alsa_stream); +- break; +- case BCM2835_AUDIO_STOP: +- ret = bcm2835_audio_stop_worker(w->alsa_stream); +- break; +- case BCM2835_AUDIO_WRITE: +- ret = bcm2835_audio_write_worker(w->alsa_stream, w->count, +- w->src); +- break; +- default: +- LOG_ERR(" Unexpected work: %p:%d\n", w->alsa_stream, w->cmd); +- break; +- } +- kfree((void *)work); +-} +- +-int bcm2835_audio_start(struct bcm2835_alsa_stream *alsa_stream) +-{ +- struct bcm2835_audio_work *work; +- +- work = kmalloc(sizeof(*work), GFP_ATOMIC); +- /*--- Queue some work (item 1) ---*/ +- if (!work) { +- LOG_ERR(" .. Error: NULL work kmalloc\n"); +- return -ENOMEM; +- } +- INIT_WORK(&work->my_work, my_wq_function); +- work->alsa_stream = alsa_stream; +- work->cmd = BCM2835_AUDIO_START; +- if (!queue_work(alsa_stream->my_wq, &work->my_work)) { +- kfree(work); +- return -EBUSY; +- } +- return 0; +-} +- +-int bcm2835_audio_stop(struct bcm2835_alsa_stream *alsa_stream) +-{ +- struct bcm2835_audio_work *work; +- +- work = kmalloc(sizeof(*work), GFP_ATOMIC); +- /*--- Queue some work (item 1) ---*/ +- if (!work) { +- LOG_ERR(" .. Error: NULL work kmalloc\n"); +- return -ENOMEM; +- } +- INIT_WORK(&work->my_work, my_wq_function); +- work->alsa_stream = alsa_stream; +- work->cmd = BCM2835_AUDIO_STOP; +- if (!queue_work(alsa_stream->my_wq, &work->my_work)) { +- kfree(work); +- return -EBUSY; +- } +- return 0; +-} +- +-int bcm2835_audio_write(struct bcm2835_alsa_stream *alsa_stream, +- unsigned int count, void *src) +-{ +- struct bcm2835_audio_work *work; +- +- work = kmalloc(sizeof(*work), GFP_ATOMIC); +- /*--- Queue some work (item 1) ---*/ +- if (!work) { +- LOG_ERR(" .. Error: NULL work kmalloc\n"); +- return -ENOMEM; +- } +- INIT_WORK(&work->my_work, my_wq_function); +- work->alsa_stream = alsa_stream; +- work->cmd = BCM2835_AUDIO_WRITE; +- work->src = src; +- work->count = count; +- if (!queue_work(alsa_stream->my_wq, &work->my_work)) { +- kfree(work); +- return -EBUSY; +- } +- return 0; +-} +- +-static void my_workqueue_quit(struct bcm2835_alsa_stream *alsa_stream) +-{ +- flush_workqueue(alsa_stream->my_wq); +- destroy_workqueue(alsa_stream->my_wq); +- alsa_stream->my_wq = NULL; +-} +- + static void audio_vchi_callback(void *param, + const VCHI_CALLBACK_REASON_T reason, + void *msg_handle) +@@ -249,47 +132,27 @@ static void audio_vchi_callback(void *pa + if (reason != VCHI_CALLBACK_MSG_AVAILABLE) + return; + +- if (!instance) { +- LOG_ERR(" .. instance is null\n"); +- BUG(); +- return; +- } +- if (!instance->vchi_handle) { +- LOG_ERR(" .. instance->vchi_handle is null\n"); +- BUG(); +- return; +- } + status = vchi_msg_dequeue(instance->vchi_handle, + &m, sizeof(m), &msg_len, VCHI_FLAGS_NONE); + if (m.type == VC_AUDIO_MSG_TYPE_RESULT) { +- LOG_DBG(" .. instance=%p, m.type=VC_AUDIO_MSG_TYPE_RESULT, success=%d\n", +- instance, m.u.result.success); + instance->result = m.u.result.success; + complete(&instance->msg_avail_comp); + } else if (m.type == VC_AUDIO_MSG_TYPE_COMPLETE) { +- struct bcm2835_alsa_stream *alsa_stream = instance->alsa_stream; +- +- LOG_DBG(" .. instance=%p, m.type=VC_AUDIO_MSG_TYPE_COMPLETE, complete=%d\n", +- instance, m.u.complete.count); + if (m.u.complete.cookie1 != BCM2835_AUDIO_WRITE_COOKIE1 || + m.u.complete.cookie2 != BCM2835_AUDIO_WRITE_COOKIE2) +- LOG_ERR(" .. response is corrupt\n"); +- else if (alsa_stream) { +- atomic_add(m.u.complete.count, +- &alsa_stream->retrieved); +- bcm2835_playback_fifo(alsa_stream); +- } else { +- LOG_ERR(" .. unexpected alsa_stream=%p\n", +- alsa_stream); +- } ++ LOG_ERR("invalid cookie\n"); ++ else ++ bcm2835_playback_fifo(instance->alsa_stream, ++ m.u.complete.count); + } else { +- LOG_ERR(" .. unexpected m.type=%d\n", m.type); ++ LOG_ERR("unexpected callback type=%d\n", m.type); + } + } + +-static struct bcm2835_audio_instance * ++static int + vc_vchi_audio_init(VCHI_INSTANCE_T vchi_instance, +- VCHI_CONNECTION_T *vchi_connection) ++ VCHI_CONNECTION_T *vchi_connection, ++ struct bcm2835_audio_instance *instance) + { + SERVICE_CREATION_T params = { + .version = VCHI_VERSION_EX(VC_AUDIOSERV_VER, VC_AUDIOSERV_MIN_VER), +@@ -298,23 +161,14 @@ vc_vchi_audio_init(VCHI_INSTANCE_T vchi_ + .rx_fifo_size = 0, + .tx_fifo_size = 0, + .callback = audio_vchi_callback, ++ .callback_param = instance, + .want_unaligned_bulk_rx = 1, //TODO: remove VCOS_FALSE + .want_unaligned_bulk_tx = 1, //TODO: remove VCOS_FALSE + .want_crc = 0 + }; +- struct bcm2835_audio_instance *instance; + int status; + +- /* Allocate memory for this instance */ +- instance = kzalloc(sizeof(*instance), GFP_KERNEL); +- if (!instance) +- return ERR_PTR(-ENOMEM); +- +- /* Create a lock for exclusive, serialized VCHI connection access */ +- mutex_init(&instance->vchi_mutex); + /* Open the VCHI service connections */ +- params.callback_param = instance, +- + status = vchi_service_open(vchi_instance, ¶ms, + &instance->vchi_handle); + +@@ -322,16 +176,16 @@ vc_vchi_audio_init(VCHI_INSTANCE_T vchi_ + LOG_ERR("%s: failed to open VCHI service connection (status=%d)\n", + __func__, status); + kfree(instance); +- return ERR_PTR(-EPERM); ++ return -EPERM; + } + + /* Finished with the service for now */ + vchi_service_release(instance->vchi_handle); + +- return instance; ++ return 0; + } + +-static int vc_vchi_audio_deinit(struct bcm2835_audio_instance *instance) ++static void vc_vchi_audio_deinit(struct bcm2835_audio_instance *instance) + { + int status; + +@@ -346,10 +200,6 @@ static int vc_vchi_audio_deinit(struct b + } + + mutex_unlock(&instance->vchi_mutex); +- +- kfree(instance); +- +- return 0; + } + + int bcm2835_new_vchi_ctx(struct bcm2835_vchi_ctx *vchi_ctx) +@@ -387,39 +237,25 @@ void bcm2835_free_vchi_ctx(struct bcm283 + vchi_ctx->vchi_instance = NULL; + } + +-static int bcm2835_audio_open_connection(struct bcm2835_alsa_stream *alsa_stream) +-{ +- struct bcm2835_audio_instance *instance = +- (struct bcm2835_audio_instance *)alsa_stream->instance; +- struct bcm2835_vchi_ctx *vhci_ctx = alsa_stream->chip->vchi_ctx; +- +- /* Initialize an instance of the audio service */ +- instance = vc_vchi_audio_init(vhci_ctx->vchi_instance, +- vhci_ctx->vchi_connection); +- +- if (IS_ERR(instance)) +- return PTR_ERR(instance); +- +- instance->alsa_stream = alsa_stream; +- alsa_stream->instance = instance; +- +- return 0; +-} +- + int bcm2835_audio_open(struct bcm2835_alsa_stream *alsa_stream) + { ++ struct bcm2835_vchi_ctx *vchi_ctx = alsa_stream->chip->vchi_ctx; + struct bcm2835_audio_instance *instance; + int err; + +- alsa_stream->my_wq = alloc_workqueue("my_queue", WQ_HIGHPRI, 1); +- if (!alsa_stream->my_wq) ++ /* Allocate memory for this instance */ ++ instance = kzalloc(sizeof(*instance), GFP_KERNEL); ++ if (!instance) + return -ENOMEM; ++ mutex_init(&instance->vchi_mutex); ++ instance->alsa_stream = alsa_stream; ++ alsa_stream->instance = instance; + +- err = bcm2835_audio_open_connection(alsa_stream); ++ err = vc_vchi_audio_init(vchi_ctx->vchi_instance, ++ vchi_ctx->vchi_connection, ++ instance); + if (err < 0) +- goto free_wq; +- +- instance = alsa_stream->instance; ++ goto free_instance; + + err = bcm2835_audio_send_simple(instance, VC_AUDIO_MSG_TYPE_OPEN, + false); +@@ -438,8 +274,9 @@ int bcm2835_audio_open(struct bcm2835_al + + deinit: + vc_vchi_audio_deinit(instance); +- free_wq: +- destroy_workqueue(alsa_stream->my_wq); ++ free_instance: ++ alsa_stream->instance = NULL; ++ kfree(instance); + return err; + } + +@@ -478,37 +315,46 @@ int bcm2835_audio_set_params(struct bcm2 + return bcm2835_audio_send_msg(alsa_stream->instance, &m, true); + } + +-static int bcm2835_audio_start_worker(struct bcm2835_alsa_stream *alsa_stream) ++int bcm2835_audio_start(struct bcm2835_alsa_stream *alsa_stream) + { + return bcm2835_audio_send_simple(alsa_stream->instance, + VC_AUDIO_MSG_TYPE_START, false); + } + +-static int bcm2835_audio_stop_worker(struct bcm2835_alsa_stream *alsa_stream) ++int bcm2835_audio_stop(struct bcm2835_alsa_stream *alsa_stream) + { + return bcm2835_audio_send_simple(alsa_stream->instance, + VC_AUDIO_MSG_TYPE_STOP, false); + } + ++int bcm2835_audio_drain(struct bcm2835_alsa_stream *alsa_stream) ++{ ++ struct vc_audio_msg m = { ++ .type = VC_AUDIO_MSG_TYPE_STOP, ++ .u.stop.draining = 1, ++ }; ++ ++ return bcm2835_audio_send_msg(alsa_stream->instance, &m, false); ++} ++ + int bcm2835_audio_close(struct bcm2835_alsa_stream *alsa_stream) + { + struct bcm2835_audio_instance *instance = alsa_stream->instance; + int err; + +- my_workqueue_quit(alsa_stream); +- + err = bcm2835_audio_send_simple(alsa_stream->instance, + VC_AUDIO_MSG_TYPE_CLOSE, true); + + /* Stop the audio service */ + vc_vchi_audio_deinit(instance); + alsa_stream->instance = NULL; ++ kfree(instance); + + return err; + } + +-static int bcm2835_audio_write_worker(struct bcm2835_alsa_stream *alsa_stream, +- unsigned int size, void *src) ++int bcm2835_audio_write(struct bcm2835_alsa_stream *alsa_stream, ++ unsigned int size, void *src) + { + struct bcm2835_audio_instance *instance = alsa_stream->instance; + struct vc_audio_msg m = { +@@ -558,13 +404,5 @@ static int bcm2835_audio_write_worker(st + return err; + } + +-unsigned int bcm2835_audio_retrieve_buffers(struct bcm2835_alsa_stream *alsa_stream) +-{ +- unsigned int count = atomic_read(&alsa_stream->retrieved); +- +- atomic_sub(count, &alsa_stream->retrieved); +- return count; +-} +- + module_param(force_bulk, bool, 0444); + MODULE_PARM_DESC(force_bulk, "Force use of vchiq bulk for audio"); +--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h ++++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h +@@ -121,13 +121,12 @@ struct bcm2835_alsa_stream { + + int draining; + +- unsigned int pos; ++ atomic_t pos; ++ unsigned int period_offset; + unsigned int buffer_size; + unsigned int period_size; + +- atomic_t retrieved; + struct bcm2835_audio_instance *instance; +- struct workqueue_struct *my_wq; + int idx; + }; + +@@ -152,11 +151,13 @@ int bcm2835_audio_set_params(struct bcm2 + unsigned int bps); + int bcm2835_audio_start(struct bcm2835_alsa_stream *alsa_stream); + int bcm2835_audio_stop(struct bcm2835_alsa_stream *alsa_stream); ++int bcm2835_audio_drain(struct bcm2835_alsa_stream *alsa_stream); + int bcm2835_audio_set_ctls(struct bcm2835_alsa_stream *alsa_stream); + int bcm2835_audio_write(struct bcm2835_alsa_stream *alsa_stream, + unsigned int count, + void *src); +-void bcm2835_playback_fifo(struct bcm2835_alsa_stream *alsa_stream); ++void bcm2835_playback_fifo(struct bcm2835_alsa_stream *alsa_stream, ++ unsigned int size); + unsigned int bcm2835_audio_retrieve_buffers(struct bcm2835_alsa_stream *alsa_stream); + + #endif /* __SOUND_ARM_BCM2835_H */ |