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CONFIG_SND_EP93XX_SOC_I2S_WATCHDOG: IRQ based underflow watchdog workaround

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The Linux kernel configuration item CONFIG_SND_EP93XX_SOC_I2S_WATCHDOG:

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I2S controller on EP93xx seems to have undocumented HW issue. Underflow of internal I2S controller FIFO could confuse the state machine and the whole stream can be shifted by one byte until I2S is disabled. This option enables IRQ based watchdog which disables and re-enables I2S in case of underflow and fills FIFO with zeroes.

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