Messages in this thread | | | From | Nicolin Chen <> | Date | Tue, 16 Aug 2022 23:35:22 -0700 | Subject | Re: [PATCH] ASoC: fsl_sai: Remove unnecessary FIFO reset in ISR |
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On Tue, Aug 16, 2022 at 11:29 PM Shengjiu Wang <shengjiu.wang@gmail.com> wrote:
>> > The FIFO reset drops the words in the FIFO, which may cause >> > channel swap when SAI module is running, especially when the >> > DMA speed is low. So it is not good to do FIFO reset in ISR, >> > then remove the operation. >> >> I don't recall the details of adding this many years ago, but >> leaving underrun/overrun errors unhandled does not sound right >> to me either. Would it result in a channel swap also? Perhaps >> there needs to be a reset routine that stops and restarts the >> DMA as well? > > > Remove the reset, the channel swap is gone.
I have no doubt about that :)
> IMO, no need to handle the underrun/overrun in driver, the SAI > hardware can handle the read/write pointer itself when xrun happen, > and we don't need reset routine.
That'd be okay then.
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