[PATCH v4 02/14] dmaengine: tegra-apb: Implement synchronization callback
From: Dmitry Osipenko <digetx@gmail.com>
Date: 2020-01-12 17:31:41
Also in:
linux-tegra, lkml
Subsystem:
dma generic offload engine subsystem, tegra dma drivers, the rest · Maintainers:
Vinod Koul, Laxman Dewangan, Jon Hunter, Linus Torvalds
The ISR tasklet could be kept scheduled after DMA transfer termination, let's add synchronization callback which blocks until tasklet is finished. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- drivers/dma/tegra20-apb-dma.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index 319f31d27014..664e9c5df3ba 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c@@ -798,6 +798,13 @@ static int tegra_dma_terminate_all(struct dma_chan *dc) 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) {
@@ -1506,6 +1513,7 @@ 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;
--
2.24.0