Re: [PATCH 0/4] dmaengine: qcom: bam_dma: fixes for remotely controlled bam

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On 17/01/18 10:18, Vinod Koul wrote:
On Tue, Jan 16, 2018 at 07:02:32PM +0000, srinivas.kandagatla@xxxxxxxxxx wrote:
From: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>

Hi Andy,

I did hit few issues while trying out SLIMBus BAM on DB820c, this BAM instance
is remotely controlled and powered up after ADSP is booted using QMI commands.

What do you mean by "remotely controlled" in this series?

DMA controller is controlled by the remote processor, which is a DSP in this case. Linux side is in remote mode in this setup, this can setup transfer descriptors and start/stop a transfer. But all the initialization/powerup part will be done in the remote processor.

--srini



Firstly some of the master registers are written even when the BAM is remotely
controlled, and secondly reading registers when bam is not ready yet.

These 4 patches address these issues, there are few more issues like doing PM
in simillar usecase, these will be addressed soon.

Thanks,
Srini

Srinivas Kandagatla (4):
   dmaengine: qcom: bam_dma: make bam clk optional
   dmaengine: qcom: bam_dma: add num-channels binding for remotely
     controlled
   dmaengine: qcom: bam_dma: do not write to global regs in remote mode
   dmaengine: qcom: bam_dma: Add num-ees dt binding for remotely
     controlled

  .../devicetree/bindings/dma/qcom_bam_dma.txt       |  4 ++
  drivers/dma/qcom/bam_dma.c                         | 56 +++++++++++++++-------
  2 files changed, 43 insertions(+), 17 deletions(-)

--
2.15.1


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