关于imx6音频播放问题

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关于imx6音频播放问题

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__123
Contributor I

现在从事imx6的开发工作,在调试wm8960的驱动的过程中,发现这么一个问题:

对wm8960的驱动的移植,我是借鉴的是飞思卡尔论坛上的对wm8960的驱动imx-wm8960.c,现在的状态是能播放声音,但是循环播放到多次的时候,差不多11次,发现开始出现问题,从sheel显示

asoc: platform imx-pcm-audio.1 hw params failed

HW_PARAMS failed: -22的信息,声音就不再播放了。

对问题进行跟踪,发现问题已经在soc-core.c文件的static int soc_pcm_hw_params(struct snd_pcm_substream *substream,

   struct snd_pcm_hw_params *params)函数里

if (platform->driver->ops && platform->driver->ops->hw_params) {
  ret = platform->driver->ops->hw_params(substream, params);
  if (ret < 0) {
  printk(KERN_ERR "asoc: platform %s hw params failed\n",
  platform->name);
  goto platform_err;
  }
}处。还请指教。

Original Attachment has been moved to: imx-wm8960.c.zip

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4 Replies

1,257 Views
Rita_Wang
NXP TechSupport
NXP TechSupport

Hi li xing,

You can refer to the document WM8960 audio codec .

Hope this can help you.
Have a great day,
Dan

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1,257 Views
__123
Contributor I

谢谢,我参考的就是这篇文章,我把问题定位了,应该是dma出了问题 发自网易邮箱 在2015年09月02日 10:12 ,b45499写道: 关于imx6音频播放问题 reply from Dan Wang in i.MX Community - View the full discussion Hi li xing, You can refer to the document WM8960 audio codec . Hope this can help you. Have a great day, Dan

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1,257 Views
jimmychan
NXP TechSupport
NXP TechSupport

能說明一下dma的問題嗎? 謝謝

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1,257 Views
__123
Contributor I

在声音测试中,我进行循环播放,前10次的播放是正常的,从第11次开始,

开始提示

asoc: platform imx-pcm-audio.1 hw params failed

HW_PARAMS failed: -22的信息,声音就不再播放了。

的信息。通过对问题定位是因为申请不到DMA通道了。

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