From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Osipenko Subject: [PATCH v6 03/16] dmaengine: tegra-apb: Implement synchronization hook Date: Thu, 30 Jan 2020 07:37:51 +0300 Message-ID: <20200130043804.32243-4-digetx@gmail.com> References: <20200130043804.32243-1-digetx@gmail.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20200130043804.32243-1-digetx@gmail.com> Sender: linux-kernel-owner@vger.kernel.org To: Laxman Dewangan , Vinod Koul , Dan Williams , Thierry Reding , Jonathan Hunter , =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= Cc: dmaengine@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-tegra@vger.kernel.org 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 Signed-off-by: Dmitry Osipenko --- 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