Intel HDA: read back CORBCTL value when enabling DMA, add fallback to PIO on RIRB timeout #68
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… PIO on RIRB timeout
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Patch without the /PIO option from #64.
The PIO fallback is done in snd_hda_codec_read and azx_get_response.
azx_get_response will set the PIO bit of chip->config_select, then snd_hda_codec_read will disable CORB/RIRB DMA and retry reading.