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Message-Id: <20200130043804.32243-4-digetx@gmail.com>
Date: Thu, 30 Jan 2020 07:37:51 +0300
From: Dmitry Osipenko <digetx@...il.com>
To: Laxman Dewangan <ldewangan@...dia.com>,
Vinod Koul <vkoul@...nel.org>,
Dan Williams <dan.j.williams@...el.com>,
Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc: dmaengine@...r.kernel.org, linux-tegra@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v6 03/16] 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.
Acked-by: Jon Hunter <jonathanh@...dia.com>
Signed-off-by: Dmitry Osipenko <digetx@...il.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 4a750e29bfb5..f56881500a23 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
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