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-rw-r--r--drivers/dma/pl330.c1
-rw-r--r--include/linux/dmaengine.h28
-rw-r--r--sound/soc/adi/axi-i2s.c3
-rw-r--r--sound/soc/adi/axi-spdif.c3
-rw-r--r--sound/soc/samsung/dmaengine.c1
-rw-r--r--sound/soc/soc-generic-dmaengine-pcm.c66
6 files changed, 73 insertions, 29 deletions
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 536632f6479c..c90edecee463 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2884,6 +2884,7 @@ static int pl330_dma_device_slave_caps(struct dma_chan *dchan,
caps->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
caps->cmd_pause = false;
caps->cmd_terminate = true;
+ caps->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
return 0;
}
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index ed92b30a02fd..ba5f96db0754 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -364,6 +364,32 @@ struct dma_slave_config {
unsigned int slave_id;
};
+/**
+ * enum dma_residue_granularity - Granularity of the reported transfer residue
+ * @DMA_RESIDUE_GRANULARITY_DESCRIPTOR: Residue reporting is not support. The
+ * DMA channel is only able to tell whether a descriptor has been completed or
+ * not, which means residue reporting is not supported by this channel. The
+ * residue field of the dma_tx_state field will always be 0.
+ * @DMA_RESIDUE_GRANULARITY_SEGMENT: Residue is updated after each successfully
+ * completed segment of the transfer (For cyclic transfers this is after each
+ * period). This is typically implemented by having the hardware generate an
+ * interrupt after each transferred segment and then the drivers updates the
+ * outstanding residue by the size of the segment. Another possibility is if
+ * the hardware supports scatter-gather and the segment descriptor has a field
+ * which gets set after the segment has been completed. The driver then counts
+ * the number of segments without the flag set to compute the residue.
+ * @DMA_RESIDUE_GRANULARITY_BURST: Residue is updated after each transferred
+ * burst. This is typically only supported if the hardware has a progress
+ * register of some sort (E.g. a register with the current read/write address
+ * or a register with the amount of bursts/beats/bytes that have been
+ * transferred or still need to be transferred).
+ */
+enum dma_residue_granularity {
+ DMA_RESIDUE_GRANULARITY_DESCRIPTOR = 0,
+ DMA_RESIDUE_GRANULARITY_SEGMENT = 1,
+ DMA_RESIDUE_GRANULARITY_BURST = 2,
+};
+
/* struct dma_slave_caps - expose capabilities of a slave channel only
*
* @src_addr_widths: bit mask of src addr widths the channel supports
@@ -374,6 +400,7 @@ struct dma_slave_config {
* should be checked by controller as well
* @cmd_pause: true, if pause and thereby resume is supported
* @cmd_terminate: true, if terminate cmd is supported
+ * @residue_granularity: granularity of the reported transfer residue
*/
struct dma_slave_caps {
u32 src_addr_widths;
@@ -381,6 +408,7 @@ struct dma_slave_caps {
u32 directions;
bool cmd_pause;
bool cmd_terminate;
+ enum dma_residue_granularity residue_granularity;
};
static inline const char *dma_chan_name(struct dma_chan *chan)
diff --git a/sound/soc/adi/axi-i2s.c b/sound/soc/adi/axi-i2s.c
index 7f91a86dd734..6058c1fd5070 100644
--- a/sound/soc/adi/axi-i2s.c
+++ b/sound/soc/adi/axi-i2s.c
@@ -236,8 +236,7 @@ static int axi_i2s_probe(struct platform_device *pdev)
if (ret)
goto err_clk_disable;
- ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL,
- SND_DMAENGINE_PCM_FLAG_NO_RESIDUE);
+ ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
if (ret)
goto err_clk_disable;
diff --git a/sound/soc/adi/axi-spdif.c b/sound/soc/adi/axi-spdif.c
index 8db7a9920695..198e3a4640f6 100644
--- a/sound/soc/adi/axi-spdif.c
+++ b/sound/soc/adi/axi-spdif.c
@@ -229,8 +229,7 @@ static int axi_spdif_probe(struct platform_device *pdev)
if (ret)
goto err_clk_disable;
- ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL,
- SND_DMAENGINE_PCM_FLAG_NO_RESIDUE);
+ ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
if (ret)
goto err_clk_disable;
diff --git a/sound/soc/samsung/dmaengine.c b/sound/soc/samsung/dmaengine.c
index 3be479d51b9b..750ce5808d9f 100644
--- a/sound/soc/samsung/dmaengine.c
+++ b/sound/soc/samsung/dmaengine.c
@@ -68,7 +68,6 @@ int samsung_asoc_dma_platform_register(struct device *dev)
{
return snd_dmaengine_pcm_register(dev, &samsung_dmaengine_pcm_config,
SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME |
- SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
SND_DMAENGINE_PCM_FLAG_COMPAT);
}
EXPORT_SYMBOL_GPL(samsung_asoc_dma_platform_register);
diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c
index 2a6c569d991f..560a7787d8a7 100644
--- a/sound/soc/soc-generic-dmaengine-pcm.c
+++ b/sound/soc/soc-generic-dmaengine-pcm.c
@@ -144,6 +144,8 @@ static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substrea
if (ret == 0) {
if (dma_caps.cmd_pause)
hw.info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;
+ if (dma_caps.residue_granularity <= DMA_RESIDUE_GRANULARITY_SEGMENT)
+ hw.info |= SNDRV_PCM_INFO_BATCH;
}
return snd_soc_set_runtime_hwparams(substream, &hw);
@@ -187,6 +189,21 @@ static struct dma_chan *dmaengine_pcm_compat_request_channel(
dma_data->filter_data);
}
+static bool dmaengine_pcm_can_report_residue(struct dma_chan *chan)
+{
+ struct dma_slave_caps dma_caps;
+ int ret;
+
+ ret = dma_get_slave_caps(chan, &dma_caps);
+ if (ret != 0)
+ return true;
+
+ if (dma_caps.residue_granularity == DMA_RESIDUE_GRANULARITY_DESCRIPTOR)
+ return false;
+
+ return true;
+}
+
static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
@@ -239,6 +256,16 @@ static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
max_buffer_size);
if (ret)
goto err_free;
+
+ /*
+ * This will only return false if we know for sure that at least
+ * one channel does not support residue reporting. If the DMA
+ * driver does not implement the slave_caps API we rely having
+ * the NO_RESIDUE flag set manually in case residue reporting is
+ * not supported.
+ */
+ if (!dmaengine_pcm_can_report_residue(pcm->chan[i]))
+ pcm->flags |= SND_DMAENGINE_PCM_FLAG_NO_RESIDUE;
}
return 0;
@@ -248,6 +275,18 @@ err_free:
return ret;
}
+static snd_pcm_uframes_t dmaengine_pcm_pointer(
+ struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
+
+ if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
+ return snd_dmaengine_pcm_pointer_no_residue(substream);
+ else
+ return snd_dmaengine_pcm_pointer(substream);
+}
+
static const struct snd_pcm_ops dmaengine_pcm_ops = {
.open = dmaengine_pcm_open,
.close = snd_dmaengine_pcm_close,
@@ -255,7 +294,7 @@ static const struct snd_pcm_ops dmaengine_pcm_ops = {
.hw_params = dmaengine_pcm_hw_params,
.hw_free = snd_pcm_lib_free_pages,
.trigger = snd_dmaengine_pcm_trigger,
- .pointer = snd_dmaengine_pcm_pointer,
+ .pointer = dmaengine_pcm_pointer,
};
static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
@@ -265,23 +304,6 @@ static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
.probe_order = SND_SOC_COMP_ORDER_LATE,
};
-static const struct snd_pcm_ops dmaengine_no_residue_pcm_ops = {
- .open = dmaengine_pcm_open,
- .close = snd_dmaengine_pcm_close,
- .ioctl = snd_pcm_lib_ioctl,
- .hw_params = dmaengine_pcm_hw_params,
- .hw_free = snd_pcm_lib_free_pages,
- .trigger = snd_dmaengine_pcm_trigger,
- .pointer = snd_dmaengine_pcm_pointer_no_residue,
-};
-
-static const struct snd_soc_platform_driver dmaengine_no_residue_pcm_platform = {
- .ops = &dmaengine_no_residue_pcm_ops,
- .pcm_new = dmaengine_pcm_new,
- .pcm_free = dmaengine_pcm_free,
- .probe_order = SND_SOC_COMP_ORDER_LATE,
-};
-
static const char * const dmaengine_pcm_dma_channel_names[] = {
[SNDRV_PCM_STREAM_PLAYBACK] = "tx",
[SNDRV_PCM_STREAM_CAPTURE] = "rx",
@@ -374,12 +396,8 @@ int snd_dmaengine_pcm_register(struct device *dev,
if (ret)
goto err_free_dma;
- if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
- ret = snd_soc_add_platform(dev, &pcm->platform,
- &dmaengine_no_residue_pcm_platform);
- else
- ret = snd_soc_add_platform(dev, &pcm->platform,
- &dmaengine_pcm_platform);
+ ret = snd_soc_add_platform(dev, &pcm->platform,
+ &dmaengine_pcm_platform);
if (ret)
goto err_free_dma;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-15 22:47:01 +0100