[stable-v2.2] intel: ssp: drain RX fifo when starting #7601
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If DMA is active, do not read data directly from the SSP RX fifo. Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com> (cherry picked from commit e94071f)
If DMA transaction is ongoing when RX is enabled, this can lead to stuck communication between DMA and SSP (DMA service request not seen by the DMA). To avoid this, flush the RX fifo before enabling SSP RX. Link: thesofproject#7548 Suggested-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com> Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com> (cherry picked from commit 4a4d8d2)
kv2019i
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lbetlej,
lgirdwood,
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kv2019i
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ranj063
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May 12, 2023
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Backport of #7577
Fixes: #7548