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SubjectRe: [alsa-devel] [PATCHv1 1/8] ALSA: Add SAI SoC Digital Audio Interface driver.
On 10/17/2013 11:01 AM, Xiubo Li wrote:
[...]
> +static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
> + struct snd_pcm_hw_params *params,
> + struct snd_soc_dai *cpu_dai)
> +{
> + int ret;
> +
> + ret = fsl_sai_hw_params_tr(substream, params, cpu_dai,
> + FSL_FMT_TRANSMITTER);
> + if (ret) {
> + dev_err(cpu_dai->dev,
> + "Cannot set sai transmitter hw params: %d\n",
> + ret);
> + return ret;
> + }
> +
> + ret = fsl_sai_hw_params_tr(substream, params, cpu_dai,
> + FSL_FMT_RECEIVER);
> + if (ret) {
> + dev_err(cpu_dai->dev,
> + "Cannot set sai's receiver hw params: %d\n",
> + ret);
> + return ret;
> + }

Shouldn't, depending on the substream direction, either transmit or receiver
be configured, instead of always configuring both?

> +
> + return 0;
> +}
> +
> +static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd,
> + struct snd_soc_dai *dai)
> +{
> + struct fsl_sai *sai = snd_soc_dai_get_drvdata(dai);
> + unsigned int tcsr, rcsr;
> +
> + tcsr = readl(sai->base + SAI_TCSR);
> + rcsr = readl(sai->base + SAI_RCSR);
> +
> + switch (cmd) {
> + case SNDRV_PCM_TRIGGER_START:
> + case SNDRV_PCM_TRIGGER_RESUME:
> + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
> + rcsr |= SAI_CSR_TERE | SAI_CSR_FRDE;
> + tcsr |= SAI_CSR_TERE | SAI_CSR_FRDE;
> + writel(rcsr, sai->base + SAI_RCSR);
> + udelay(10);
> + writel(tcsr, sai->base + SAI_TCSR);
> + break;
> +
> + case SNDRV_PCM_TRIGGER_STOP:
> + case SNDRV_PCM_TRIGGER_SUSPEND:
> + case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
> + tcsr &= ~(SAI_CSR_TERE | SAI_CSR_FRDE);
> + rcsr &= ~(SAI_CSR_TERE | SAI_CSR_FRDE);
> + writel(tcsr, sai->base + SAI_TCSR);
> + udelay(10);
> + writel(rcsr, sai->base + SAI_RCSR);
> + break;
> + default:
> + return -EINVAL;
> + }
> +

Same here, shouldn't tx and rx be started independently depending on the
substream direction?

> + return 0;
> +}
> +
> +static struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = {

const

> + .set_sysclk = fsl_sai_set_dai_sysclk,
> + .set_clkdiv = fsl_sai_set_dai_clkdiv,
> + .set_fmt = fsl_sai_set_dai_fmt,
> + .set_tdm_slot = fsl_sai_set_dai_tdm_slot,
> + .hw_params = fsl_sai_hw_params,
> + .trigger = fsl_sai_trigger,
> +};
[...]
> +static const struct snd_soc_component_driver fsl_component = {
> + .name = "fsl-sai",
> +};
> +
> +static int fsl_sai_probe(struct platform_device *pdev)
> +{
[...]
> +
> + sai->dma_params_rx.addr = res->start + SAI_RDR;
> + sai->dma_params_rx.maxburst = 6;
> + index = of_property_match_string(np, "dma-names", "rx");
> + ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells", index,
> + &dma_args);
> + if (ret)
> + return ret;
> + sai->dma_params_rx.slave_id = dma_args.args[1];
> +
> + sai->dma_params_tx.addr = res->start + SAI_TDR;
> + sai->dma_params_tx.maxburst = 6;
> + index = of_property_match_string(np, "dma-names", "tx");
> + ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells", index,
> + &dma_args);
> + if (ret)
> + return ret;
> + sai->dma_params_tx.slave_id = dma_args.args[1];

The driver should not have to manually parse the dma devicetree properties,
this is something that should be handled by the dma engine driver.

> +
> + ret = snd_soc_register_component(&pdev->dev, &fsl_component,
> + &fsl_sai_dai, 1);
> + if (ret)
> + return ret;
> +
> + ret = fsl_pcm_dma_init(pdev);
> + if (ret)
> + goto out;
> +
> + platform_set_drvdata(pdev, sai);
> +
> + return 0;
> +
> +out:
> + snd_soc_unregister_component(&pdev->dev);
> + return ret;
> +}


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