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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>
This commit is contained in:
Dmitry Osipenko 2020-02-09 19:33:40 +03:00 committed by Vinod Koul
parent eb0249d501
commit dda5e35a77
1 changed files with 8 additions and 0 deletions
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8
drivers/dma/tegra20-apb-dma.c
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@ -802,6 +802,13 @@ skip_dma_stop:
return 0; 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, static unsigned int tegra_dma_sg_bytes_xferred(struct tegra_dma_channel *tdc,
struct tegra_dma_sg_req *sg_req) 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.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
tdma->dma_dev.device_config = tegra_dma_slave_config; tdma->dma_dev.device_config = tegra_dma_slave_config;
tdma->dma_dev.device_terminate_all = tegra_dma_terminate_all; 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_tx_status = tegra_dma_tx_status;
tdma->dma_dev.device_issue_pending = tegra_dma_issue_pending; tdma->dma_dev.device_issue_pending = tegra_dma_issue_pending;