Messages in this thread | | | Date | Fri, 18 Jun 2010 19:26:02 +0530 | From | Viresh KUMAR <> | Subject | Re: Query dw_dmac driver: All descriptors done, but channel not idle! |
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On 6/18/2010 7:22 PM, Haavard Skinnemoen wrote: > Viresh KUMAR <viresh.kumar@st.com> wrote: >> Can somebody please confirm, if it a known issue or not? Or if there >> are some solutions for this problem. > > I'm not aware of any such issue. The code was added as a purely > defensive thing; when writing it, I just thought about what might > happen if we go through all our descriptors without finding the current > one, and added some code to report the issue and try to recover. > > I suppose it might be caused by some issue with the peripheral itself, > but I think it's more likely to be caused by some race condition in the > driver, i.e. something goes wrong when inserting or removing > descriptors in the chain. > > What might be very good to know at this point is the value of > the llp variable, and perhaps also the value of the CH_EN register to > see if the channel is idle or not. >
Thanks Haavard,
Will debug it further.
viresh.
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