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, 0 insertions, 593 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 deleted file mode 100644 index 722804ff63..0000000000 --- a/target/linux/bcm27xx/patches-4.19/950-0391-staging-bcm2835-audio-Operate-non-atomic-PCM-ops.patch +++ /dev/null @@ -1,593 +0,0 @@ -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 */ |