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    SubjectRe: [alsa-devel] [PATCH v3 15/25] ASoC: qcom: qdsp6: Add support to q6asm dai driver
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    On 2/13/2018 10:28 PM, srinivas.kandagatla@linaro.org wrote:
    > From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
    >
    > This patch adds support to q6asm dai driver which configures Q6ASM streams
    > to pass pcm data.
    >
    > Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
    [..]
    > diff --git a/sound/soc/qcom/qdsp6/q6asm-dai.c b/sound/soc/qcom/qdsp6/q6asm-dai.c
    > new file mode 100644
    > index 000000000000..7c5e94b2ced4
    > --- /dev/null
    > +++ b/sound/soc/qcom/qdsp6/q6asm-dai.c
    > @@ -0,0 +1,621 @@
    > +// SPDX-License-Identifier: GPL-2.0
    > +/*
    > + * Copyright (c) 2011-2016, The Linux Foundation
    > + * Copyright (c) 2017, Linaro Limited
    > + */
    > +
    > +#include <linux/init.h>
    > +#include <linux/err.h>
    > +#include <linux/module.h>
    > +#include <linux/platform_device.h>
    > +#include <linux/slab.h>
    > +#include <sound/soc.h>
    > +#include <sound/soc-dapm.h>
    > +#include <sound/pcm.h>
    > +#include <asm/dma.h>
    [..]
    > +static struct snd_pcm_hw_constraint_list constraints_sample_rates = {
    > + .count = ARRAY_SIZE(supported_sample_rates),
    > + .list = supported_sample_rates,
    > + .mask = 0,
    > +};
    > +
    > +static void event_handler(uint32_t opcode, uint32_t token,
    > + uint32_t *payload, void *priv)
    > +{
    > + struct q6asm_dai_rtd *prtd = priv;
    > + struct snd_pcm_substream *substream = prtd->substream;
    > +
    > + switch (opcode) {
    > + case ASM_CLIENT_EVENT_CMD_RUN_DONE:
    Need to add support for V2 version of opcodes
    > + q6asm_write_async(prtd->audio_client,
    > + prtd->pcm_count, 0, 0, NO_TIMESTAMP);
    > + break;
    > + case ASM_CLIENT_EVENT_CMD_EOS_DONE:
    > + prtd->state = Q6ASM_STREAM_STOPPED;
    > + break;
    > + case ASM_CLIENT_EVENT_DATA_WRITE_DONE: {
    > + prtd->pcm
    [..]
    > +
    > +static int q6asm_dai_trigger(struct snd_pcm_substream *substream, int cmd)
    > +{
    > + int ret = 0;
    > + struct snd_pcm_runtime *runtime = substream->runtime;
    > + struct q6asm_dai_rtd *prtd = runtime->private_data;
    > +
    > + switch (cmd) {
    > + case SNDRV_PCM_TRIGGER_START:
    > + ret = q6asm_run_nowait(prtd->audio_client, 0, 0, 0);
    > + break;
    below two cases can be combined with START if no change
    > + case SNDRV_PCM_TRIGGER_RESUME:
    > + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
    > + ret = q6asm_run_nowait(prtd->audio_client, 0, 0, 0);
    > + break;
    > + case SNDRV_PCM_TRIGGER_STOP:
    > + prtd->state = Q6ASM_STREAM_STOPPED;
    > + ret = q6asm_cmd_nowait(prtd->audio_client, CMD_EOS);
    > + break;
    > + case SNDRV_PCM_TRIGGER_SUSPEND:
    > + case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
    > + ret = q6asm_cmd_nowait(prtd->audio_client, CMD_PAUSE);
    > + break;
    > + default:
    > + ret = -EINVAL;
    > + break;
    > + }
    > +
    > + return ret;
    > +}
    > +
    > +static int q6asm_dai_open(struct snd_pcm_substream *substream)
    > +{
    > + struct snd_pcm_runtime *runtime = substream->runtime;
    > + struct snd_soc_pcm_runtime *soc_prtd = substream->private_data;
    > + struct snd_soc_dai *cpu_dai = soc_prtd->cpu_dai;
    > +
    > + struct q6asm_dai_rtd *prtd;
    > + struct q6asm_dai_data *pdata;
    > + struct device *dev = soc_prtd->platform->dev;
    > + int ret = 0;
    > + int stream_id;
    > +
    > + stream_id = cpu_dai->driver->id;
    > +
    > + pdata = q6asm_get_dai_data(dev);
    > + if (!pdata) {
    > + pr_err("Platform data not found ..\n");
    > + return -EINVAL;
    > + }
    > +
    > + prtd = kzalloc(sizeof(struct q6asm_dai_rtd), GFP_KERNEL);
    > + if (prtd == NULL)
    > + return -ENOMEM;
    > +
    > + prtd->substream = substream;
    > + prtd->audio_client = q6asm_audio_client_alloc(dev,
    > + (q6asm_cb)event_handler, prtd, stream_id);
    > + if (!prtd->audio_client) {
    > + pr_info("%s: Could not allocate memory\n", __func__);
    > + kfree(prtd);
    > + return -ENOMEM;
    > + }
    > +
    > +// prtd->audio_client->dev = dev;
    cleanup this
    > +
    > + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
    > + runtime->hw = q6asm_dai_hardware_playback;
    > +
    > + ret = snd_pcm_hw_constraint_list(runtime, 0,
    > + SNDRV_PCM_HW_PARAM_RATE,
    > + &constraints_sample_rates);
    [..]
    > +
    > +static int q6asm_dai_pcm_new(struct snd_soc_pcm_runtime *rtd)
    > +{
    > + struct snd_pcm_substream *substream;
    > + struct of_phandle_args args;
    > + struct device_node *node;
    > + struct q6asm_dai_data *pdata;
    > + struct snd_pcm *pcm = rtd->pcm;
    > + struct device *dev;
    > + int size, ret;
    > +
    > + dev = rtd->platform->dev->parent;
    > + node = dev->of_node;
    > + pdata = q6asm_get_dai_data(rtd->platform->dev);
    > +
    > + ret = of_parse_phandle_with_fixed_args(node, "iommus", 1, 0, &args);
    > + if (ret < 0)
    > + pdata->sid = -1;
    > + else
    > + pdata->sid = args.args[0];
    > +
    > +
    > +
    iommus for sdm845 is 16bit value. we need to have sid_mask which is 0x1
    in sdm845. We need to mask sid with 0x1 to get proper sid.
    pdata->sid &= 0x1;
    > + substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
    > + size = q6asm_dai_hardware_playback.buffer_bytes_max;
    > + ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, dev, size,
    > + &substream->dma_buffer);
    > + if (ret)
    > + dev_err(dev, "Cannot allocate buffer(s)\n");
    > +
    > + return ret;
    > +}
    > +


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