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    SubjectRe: [PATCH 1/7 v2] dmaengine: add a simple dma library
    Hi Guennadi-san,

    2012/02/03 7:19, Guennadi Liakhovetski wrote:
    [ snip ]
    >> Thank you for your comment.
    >> I investigaed the issue. I found out the renesas_usbhs driver may
    >> call tx_submit() in the callback() of the dma-simple finally.
    > Sorry, in my first reply to this your email I misread the renesas_usbhs
    > for an issue with your new SUDMAC driver. Since this is not the case and
    > my patch seems to be causing a regression, I'll look at it.

    Thank you for the comment.

    I found out that if the "power_up" is 0 in the sample_tx_submit(),
    the pm_state will be changed to "PENDING".
    And then, even if the renesas_usbhs calls dma_async_issue_pending(),
    the dma-simple driver doesn't call the simple_chan_xfer_ld_queue().
    This is because the driver will call the simple_chan_xfer_ld_queue()
    when the pm_state is "ESTABLISHED" only.

    So I guess that we have to modify the simple_issue_pending().

    Best regards,
    Yoshihiro Shimoda

    > Thanks
    > Guennadi
    > ---
    > Guennadi Liakhovetski, Ph.D.
    > Freelance Open-Source Software Developer
    Yoshihiro Shimoda <>

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      Last update: 2012-02-03 09:49    [W:0.024 / U:1.588 seconds]
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