Hi Daniel and Zhangfei, I have resumed my work on marvell dma engine support, in order to have pxa_camera working with it. For reference, it is described in Documentation/video4linux/pxa_camera.txt, and was already discussed in [1]. What I'll need to do is have a dma driver which : - upon tx_submit tries to "hot chain" the transmission And doesn't attemp to queue a new tx in the tasklet. - upon dma completion interrupt calls each terminated tx->complete() function, and not only the first tx's one - can tell me if a channel is still running or is stopped As I have these constraints, I have 2 choices : 1) develop a new pxa_dma.c, which will have some common code with mmp_pdma.c 2) amend mmp_pdma The issue with (2) is that it might break existing drivers using the paradigm that "only the first tx is signaled". Therefore I'm hesitating between (1) and (2), and need to know beforehand which path to choose, as I don't want to be told once my work is done that I should trash it (in which case I prefer begin with (1) directly). Cheers. -- Robert [1] http://lists.infradead.org/pipermail/linux-mtd/2013-August/047965.html -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
