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SubjectRe: [PATCH v2 2/2] sound: lpass-platform: Move dma channel allocation to pcmops
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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

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