dmaengine: tegra-apb: Implement synchronization hook (dda5e35a) · Commits · 戴 / test

The ISR tasklet could be kept scheduled after DMA transfer termination, let's add synchronization hook which blocks until tasklet is finished. Signed-off-by:

Dmitry Osipenko <digetx@gmail.com> Acked-by:

Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-4-digetx@gmail.com Signed-off-by:

Vinod Koul <vkoul@kernel.org>

drivers/dma/tegra20-apb-dma.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -802,6 +802,13 @@ skip_dma_stop:
		return 0;
		}

		static void tegra_dma_synchronize(struct dma_chan *dc)
		{
		struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);

		tasklet_kill(&tdc->tasklet);
		}

		static unsigned int tegra_dma_sg_bytes_xferred(struct tegra_dma_channel *tdc,
		struct tegra_dma_sg_req *sg_req)
		{
		@@ -1510,6 +1517,7 @@ static int tegra_dma_probe(struct platform_device *pdev)
		tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
		tdma->dma_dev.device_config = tegra_dma_slave_config;
		tdma->dma_dev.device_terminate_all = tegra_dma_terminate_all;
		tdma->dma_dev.device_synchronize = tegra_dma_synchronize;
		tdma->dma_dev.device_tx_status = tegra_dma_tx_status;
		tdma->dma_dev.device_issue_pending = tegra_dma_issue_pending;

Admin message