On Wed, Aug 31, 2016 at 12:30:20PM +0000, Radhey Shyam Pandey wrote: > Hi Vinod, > > > > > why cant a trxn from user be split to multiple dmanegine txn's? > > > > > > Assuming we split frame transfer into two dma_async_tx_descriptor (two > > > callbacks) Then we need some mechanism to pass multiplanar > > > information from client driver to dmaengine driver? > > > i.e dma programming sequence will be different for single/multiple > > > destination buffer address. > > > > Can you explain how? > > For single frame. > a) Program DMA_IP ADDR0 register. > b) Configure other required params and start the DMA controller. > > For multi-planar frame (plane count = 2) > a) Program DMA_IP ADDR0 register. > b) Program DMA_IP ADDR1 register. > c) Configure other required params and start the DMA controller. So from dmaengine flow I can see: - Prepere plane0 descriptor - Prepare plane1 descriptor - Submit both - Issue pending, that kicks off these two in sequence and completes them. What is the issue with this flow from above logic. -- ~Vinod -- 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
