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authorStephen Warren <swarren@nvidia.com>2013-12-11 16:39:48 -0700
committerStephen Warren <swarren@nvidia.com>2013-12-11 16:39:48 -0700
commitf229a93051c967e38850f0c213a0bf945e7c3c12 (patch)
tree51ea08cb9354f462a9a7785da869429e18b9a5d6 /sound
parent076843e3e8a4fedb480cdad970f7cec25d32c0ab (diff)
parente9036c2a60f368b8ddc349fbbcde918ed32ab597 (diff)
downloadop-kernel-dev-f229a93051c967e38850f0c213a0bf945e7c3c12.zip
op-kernel-dev-f229a93051c967e38850f0c213a0bf945e7c3c12.tar.gz
Merge tag 'asoc-dma-v3.14' into for-3.14/dmas-resets-rework
ASoC: dma: Generic ASoC dmaengine driver enhancements This is the work so far on dmaengine for v3.14, it is being cross merged into the Tegra tree to support a large DMA overhaul there. The main additions are a change in the DMA request API which allows better interaction at system startup using deferred probes and methods for overriding the default device and channel names used to request DMA.
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/soc-devres.c41
-rw-r--r--sound/soc/soc-generic-dmaengine-pcm.c94
2 files changed, 113 insertions, 22 deletions
diff --git a/sound/soc/soc-devres.c b/sound/soc/soc-devres.c
index 3449c1e..7ac745d 100644
--- a/sound/soc/soc-devres.c
+++ b/sound/soc/soc-devres.c
@@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
static void devm_component_release(struct device *dev, void *res)
{
@@ -84,3 +85,43 @@ int devm_snd_soc_register_card(struct device *dev, struct snd_soc_card *card)
return ret;
}
EXPORT_SYMBOL_GPL(devm_snd_soc_register_card);
+
+#ifdef CONFIG_SND_SOC_GENERIC_DMAENGINE_PCM
+
+static void devm_dmaengine_pcm_release(struct device *dev, void *res)
+{
+ snd_dmaengine_pcm_unregister(*(struct device **)res);
+}
+
+/**
+ * devm_snd_dmaengine_pcm_register - resource managed dmaengine PCM registration
+ * @dev: The parent device for the PCM device
+ * @config: Platform specific PCM configuration
+ * @flags: Platform specific quirks
+ *
+ * Register a dmaengine based PCM device with automatic unregistration when the
+ * device is unregistered.
+ */
+int devm_snd_dmaengine_pcm_register(struct device *dev,
+ const struct snd_dmaengine_pcm_config *config, unsigned int flags)
+{
+ struct device **ptr;
+ int ret;
+
+ ptr = devres_alloc(devm_dmaengine_pcm_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return -ENOMEM;
+
+ ret = snd_dmaengine_pcm_register(dev, config, flags);
+ if (ret == 0) {
+ *ptr = dev;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(devm_snd_dmaengine_pcm_register);
+
+#endif
diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c
index cbc9c96..7483922 100644
--- a/sound/soc/soc-generic-dmaengine-pcm.c
+++ b/sound/soc/soc-generic-dmaengine-pcm.c
@@ -137,6 +137,9 @@ static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substrea
hw.buffer_bytes_max = SIZE_MAX;
hw.fifo_size = dma_data->fifo_size;
+ if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
+ hw.info |= SNDRV_PCM_INFO_BATCH;
+
ret = dma_get_slave_caps(chan, &dma_caps);
if (ret == 0) {
if (dma_caps.cmd_pause)
@@ -284,24 +287,67 @@ static const char * const dmaengine_pcm_dma_channel_names[] = {
[SNDRV_PCM_STREAM_CAPTURE] = "rx",
};
-static void dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
- struct device *dev)
+static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
+ struct device *dev, const struct snd_dmaengine_pcm_config *config)
{
unsigned int i;
+ const char *name;
+ struct dma_chan *chan;
if ((pcm->flags & (SND_DMAENGINE_PCM_FLAG_NO_DT |
SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME)) ||
!dev->of_node)
- return;
+ return 0;
+
+ if (config->dma_dev) {
+ /*
+ * If this warning is seen, it probably means that your Linux
+ * device structure does not match your HW device structure.
+ * It would be best to refactor the Linux device structure to
+ * correctly match the HW structure.
+ */
+ dev_warn(dev, "DMA channels sourced from device %s",
+ dev_name(config->dma_dev));
+ dev = config->dma_dev;
+ }
- if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) {
- pcm->chan[0] = dma_request_slave_channel(dev, "rx-tx");
- pcm->chan[1] = pcm->chan[0];
- } else {
- for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
- pcm->chan[i] = dma_request_slave_channel(dev,
- dmaengine_pcm_dma_channel_names[i]);
+ for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE;
+ i++) {
+ if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
+ name = "rx-tx";
+ else
+ name = dmaengine_pcm_dma_channel_names[i];
+ if (config->chan_names[i])
+ name = config->chan_names[i];
+ chan = dma_request_slave_channel_reason(dev, name);
+ if (IS_ERR(chan)) {
+ if (PTR_ERR(chan) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ pcm->chan[i] = NULL;
+ } else {
+ pcm->chan[i] = chan;
}
+ if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
+ break;
+ }
+
+ if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
+ pcm->chan[1] = pcm->chan[0];
+
+ return 0;
+}
+
+static void dmaengine_pcm_release_chan(struct dmaengine_pcm *pcm)
+{
+ unsigned int i;
+
+ for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE;
+ i++) {
+ if (!pcm->chan[i])
+ continue;
+ dma_release_channel(pcm->chan[i]);
+ if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
+ break;
}
}
@@ -315,6 +361,7 @@ int snd_dmaengine_pcm_register(struct device *dev,
const struct snd_dmaengine_pcm_config *config, unsigned int flags)
{
struct dmaengine_pcm *pcm;
+ int ret;
pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
if (!pcm)
@@ -323,14 +370,25 @@ int snd_dmaengine_pcm_register(struct device *dev,
pcm->config = config;
pcm->flags = flags;
- dmaengine_pcm_request_chan_of(pcm, dev);
+ ret = dmaengine_pcm_request_chan_of(pcm, dev, config);
+ if (ret)
+ goto err_free_dma;
if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
- return snd_soc_add_platform(dev, &pcm->platform,
+ ret = snd_soc_add_platform(dev, &pcm->platform,
&dmaengine_no_residue_pcm_platform);
else
- return snd_soc_add_platform(dev, &pcm->platform,
+ ret = snd_soc_add_platform(dev, &pcm->platform,
&dmaengine_pcm_platform);
+ if (ret)
+ goto err_free_dma;
+
+ return 0;
+
+err_free_dma:
+ dmaengine_pcm_release_chan(pcm);
+ kfree(pcm);
+ return ret;
}
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register);
@@ -345,7 +403,6 @@ void snd_dmaengine_pcm_unregister(struct device *dev)
{
struct snd_soc_platform *platform;
struct dmaengine_pcm *pcm;
- unsigned int i;
platform = snd_soc_lookup_platform(dev);
if (!platform)
@@ -353,15 +410,8 @@ void snd_dmaengine_pcm_unregister(struct device *dev)
pcm = soc_platform_to_pcm(platform);
- for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
- if (pcm->chan[i]) {
- dma_release_channel(pcm->chan[i]);
- if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
- break;
- }
- }
-
snd_soc_remove_platform(platform);
+ dmaengine_pcm_release_chan(pcm);
kfree(pcm);
}
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister);
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