On Thu, Feb 23, 2017 at 07:01:58PM +0100, Frode Isaksen wrote: > When doing rx-only transfer, the transfer will fail > if the number of SG entries exceeds 20. > This happens because the eDMA DMA engine is limited > to 20 SG entries in one transaction, and when the > DMA transcation is resumed (which takes > 150us), > rx errors occurs because the slave is still transmitting. > Fix this by using the rx buffer as the dummy tx buffer, > so that resuming the rx transcation happens at the same > time as resuming the tx transcation. Please submit a followup patch adding a comment explaing what's going in the actual code as someone's going to clean this up at some point.
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