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Commit 52ae6581 authored by Laxminath Kasam's avatar Laxminath Kasam
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asoc: codecs: bolero: Fix L/R swap issue on bolero RX



Left and right channel content can get swapped
in new cdc_dma interface.

DMA interfaces underrun results in Channels being swapped.

This issue is a side effect current SW setup for RX path:
  1.  HLOS Setup WCD Analog Path, Bolero CODEC.
      CODEC would drive Fs to LPASS DMAs requesting for PCM samples.
  2.  DSP setup RX Buffers in Memory :
  3.  DSP Configures RD DMAs and DMA RXTX CODEC interface
      (Enable CODEC DMA interface buffer and
       Enable DMA LPASS_RXTX_LPAIF_RDDMA_CTL0.ENABLE
       and LPASS_RXTX_LPAIF_RDDMA_CODEC_INTF0.ENABLE
    If CODEC Fs, aligns with DMA interface being enabled
    there is an underrun as DMA interface pingpong buffer is empty.
    This results in channels being swapped.

Proposed work around while keeping current SW setup order.
Provide a workaround to Keep Fs disabled  until DMAs and
CODEC DMA interface are enabled and HW could  prefetch all buffers.
SW would keep existing setup order:
  1.  HLOS Setup WCD Analog Path, Bolero CODEC.
      CODEC would drive Fs to LPASS DMAs requesting for PCM samples.
  2.  DSP setup RX Buffers in Memory :
  3.  DSP Configures DMAs and DMA CODEC interface
      (Enable CODEC DMA interface buffer and
       Enable DMA LPASS_RXTX_LPAIF_RDDMA_CTL0.ENABLE
       and LPASS_RXTX_LPAIF_RDDMA_CODEC_INTF0.ENABLE)
  4.  Enable Fs Set #LPASS_RX_CDC_RX0_RX_PATH_CTL. CLK_EN to ONE

Change-Id: I7916667f5d857464cc7d77b51da307ab234cc7bb
Signed-off-by: default avatarLaxminath Kasam <lkasam@codeaurora.org>
parent 47673f2f
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