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authorDmitry Osipenko <digetx@gmail.com>2020-02-09 19:33:40 +0300
committerVinod Koul <vkoul@kernel.org>2020-02-25 11:57:32 +0530
commitdda5e35a771043bb5a9e6107fa9f141d8d56b847 (patch)
treeb7d7fac895a8b628557c39be6eb943bfad2ae2b4 /drivers/dma
parenteb0249d50153a8edf2c0cfbf281199813980c8d4 (diff)
downloadlinux-dda5e35a771043bb5a9e6107fa9f141d8d56b847.tar.bz2
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 <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>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/tegra20-apb-dma.c8
1 files changed, 8 insertions, 0 deletions
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;