Hi, This series allows to check DMA transfer residue (number of bytes left to send/receive) by modifying pl330_tx_status() function, when struct dma_tx_state is filled with needed data. It also introduces DMA_PAUSE feature, which allows to halt DMA transfer before termination and read residue without risk of data loss. This features are needed for proper implementation of DMA transfers, particulary for serial drivers when transfer sizes are unknown and requests on DMA channels are terminated before transfer completion very ofter (it's becouse we terminate then in timeout interrupt to avoid latency which is usually undesirable). Best regards, Robert Baldyga Changelog: v3: - remove double pm_runtime_put() v2: https://lkml.org/lkml/2014/12/5/94 - add pm_runtime support - make it working for multi-segment transfers - some cleanups v1: https://lkml.org/lkml/2014/11/25/554 Robert Baldyga (2): dma: pl330: improve pl330_tx_status() function dma: pl330: add DMA_PAUSE feature drivers/dma/pl330.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 85 insertions(+), 2 deletions(-) -- 1.9.1 -- 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
