On 14/06/16 13:49, Kenneth Westfield wrote:
On Tue, Jun 14, 2016 at 09:30:03AM +0100, Srinivas Kandagatla wrote:
Move dma channel allocations to pcmops open and close functions. Reason
to do this is that, lpass_platform_pcm_free() accesses snd_soc_pcm_runtime
via substream->private data, However By this time runtimes are already
freed as part of soc_cleanup_card_resources() sequence.
This patch moves the channel allocations/deallocations to pcmops open()
and close() respectively, where the code has valid snd_soc_pcm_runtime.
---
sound/soc/qcom/lpass-platform.c | 155 +++++++++++++++++++---------------------
1 file changed, 74 insertions(+), 81 deletions(-)
diff --git a/sound/soc/qcom/lpass-platform.c b/sound/soc/qcom/lpass-platform.c
index db000c6..3bd2cd6 100644
--- a/sound/soc/qcom/lpass-platform.c
+++ b/sound/soc/qcom/lpass-platform.c
@@ -61,7 +61,36 @@ static int lpass_platform_pcmops_open(struct
snd_pcm_substream *substream)
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ pcm_data->rdma_ch = ch;
+ reg = LPAIF_RDMACTL_REG(v, ch);
Spacing.
Ok, s/ / /
+ } else {
+ pcm_data->wrdma_ch = ch;
+ reg = LPAIF_WRDMACTL_REG(v, ch);
Spacing.
Yep
+static int lpass_platform_pcmops_close(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+ struct lpass_pcm_data *pcm_data = snd_soc_pcm_get_drvdata(soc_runtime);
+ struct lpass_data *drvdata =
+ snd_soc_platform_get_drvdata(soc_runtime->platform);
+ struct lpass_variant *v = drvdata->variant;
+ int ch;
+
+ if (v->free_dma_channel) {
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ ch = pcm_data->rdma_ch;
+ else
+ ch = pcm_data->wrdma_ch;
+
+ if (ch >= 0)
+ v->free_dma_channel(drvdata, ch);
+ }
Since this is being moved from free() to close(), drvdata->substream[ch]
should be set to NULL. Otherwise, the array could fill up as the PCM is
opened/closed.
Yep, we could do that.
@@ -471,14 +529,12 @@ static int lpass_platform_pcm_new(struct
snd_soc_pcm_runtime *soc_runtime)
struct snd_pcm *pcm = soc_runtime->pcm;
struct snd_pcm_substream *psubstream, *csubstream;
struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
- struct lpass_data *drvdata =
- snd_soc_platform_get_drvdata(soc_runtime->platform);
- struct lpass_variant *v = drvdata->variant;
- int ret = -EINVAL;
+ struct device *dev = soc_runtime->platform->dev;
struct lpass_pcm_data *data;
size_t size = lpass_platform_pcm_hardware.buffer_bytes_max;
+ int ret = -EINVAL;
- data = devm_kzalloc(soc_runtime->dev, sizeof(*data), GFP_KERNEL);
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
Is the reason for changing the dev pointer similar to why it was changed
for snd_dma_alloc_pages() below?
Yep, Only reason is that I can fit stuff in single line.
+ ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, dev, size,
+ &psubstream->dma_buffer);
if (ret) {
- dev_err(soc_runtime->dev,
- "%s() error writing to rdmactl reg: %d\n",
- __func__, ret);
- goto capture_alloc_err;
+ dev_err(dev, "can't alloc playback dma buffer\n");
Print the return value.
Ok.
+ ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, dev, size,
+ &csubstream->dma_buffer);
if (ret) {
- dev_err(soc_runtime->dev,
- "%s() error writing to wrdmactl reg: %d\n",
- __func__, ret);
- goto capture_reg_err;
+ dev_err(dev, "can't alloc capture dma buffer\n");
Ditto.
Ok.
Thanks,
srini
