From dda5e35a771043bb5a9e6107fa9f141d8d56b847 Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Sun, 9 Feb 2020 19:33:40 +0300 Subject: dmaengine: tegra-apb: Implement synchronization hook 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 Acked-by: Jon Hunter Link: https://lore.kernel.org/r/20200209163356.6439-4-digetx@gmail.com Signed-off-by: Vinod Koul --- drivers/dma/tegra20-apb-dma.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/dma') diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c index 3a45079d11ec..b18cbfbab004 100644 --- a/drivers/dma/tegra20-apb-dma.c +++ b/drivers/dma/tegra20-apb-dma.c @@ -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; -- cgit v1.2.3