On Thu, Mar 16, 2017 at 11:12:09PM -0700, jiada_wang@xxxxxxxxxx wrote: > From: Jiada Wang <jiada_wang@xxxxxxxxxx> > > sdma_disable_channel() cannot ensure dma is stopped to access > module's FIFOs. There is chance SDMA core is running and accessing > BD when disable of corresponding channel, this may cause sometimes > even after call of .sdma_disable_channel(), SDMA core still be > running and accessing module's FIFOs. > > According to NXP R&D team a delay of one BD SDMA cost time (maximum > is 1ms) should be added after disable of the channel bit, to ensure > SDMA core has really been stopped after SDMA clients call > .device_terminate_all. > > This patch introduces adds a new function sdma_disable_channel_with_delay() > which simply adds 1ms delay after call sdma_disable_channel(), > and set it as .device_terminate_all. Applied after fixing the subsystem name. -- ~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
