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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