dmaengine Archive on lore.kernel.org
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From: Dmitry Osipenko <digetx@gmail.com>
To: "Laxman Dewangan" <ldewangan@nvidia.com>,
	"Vinod Koul" <vkoul@kernel.org>,
	"Dan Williams" <dan.j.williams@intel.com>,
	"Thierry Reding" <thierry.reding@gmail.com>,
	"Jonathan Hunter" <jonathanh@nvidia.com>,
	"Michał Mirosław" <mirq-linux@rere.qmqm.pl>
Cc: dmaengine@vger.kernel.org, linux-tegra@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v7 13/19] dmaengine: tegra-apb: Don't stop cyclic DMA in a case of error condition
Date: Mon,  3 Feb 2020 01:28:48 +0300
Message-ID: <20200202222854.18409-14-digetx@gmail.com> (raw)
In-Reply-To: <20200202222854.18409-1-digetx@gmail.com>

There is no harm in keeping DMA active in the case of error condition,
which should never happen in practice anyways. This will become useful
for the next patch, which will keep RPM enabled only during of DMA
transfer, and thus, it will be much nicer if cyclic DMA handler could
not touch the DMA-enable state.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/dma/tegra20-apb-dma.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index c7dc27ef1856..50abce608318 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -571,9 +571,7 @@ static bool handle_continuous_head_request(struct tegra_dma_channel *tdc,
 	 */
 	hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node);
 	if (!hsgreq->configured) {
-		tegra_dma_stop(tdc);
-		dev_err(tdc2dev(tdc), "Error in DMA transfer, aborting DMA\n");
-		tegra_dma_abort_all(tdc);
+		dev_err_ratelimited(tdc2dev(tdc), "Error in DMA transfer\n");
 		return false;
 	}
 
@@ -772,7 +770,10 @@ static int tegra_dma_terminate_all(struct dma_chan *dc)
 	if (!list_empty(&tdc->pending_sg_req) && was_busy) {
 		sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq),
 					 node);
-		sgreq->dma_desc->bytes_transferred +=
+		dma_desc = sgreq->dma_desc;
+
+		if (dma_desc->dma_status != DMA_ERROR)
+			dma_desc->bytes_transferred +=
 				get_current_xferred_count(tdc, sgreq, wcount);
 	}
 	tegra_dma_resume(tdc);
-- 
2.24.0


  parent reply index

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-02 22:28 [PATCH v7 00/19] NVIDIA Tegra APB DMA driver fixes and improvements Dmitry Osipenko
2020-02-02 22:28 ` [PATCH v7 01/19] dmaengine: tegra-apb: Fix use-after-free Dmitry Osipenko
2020-02-02 22:28 ` [PATCH v7 02/19] dmaengine: tegra-apb: Prevent race conditions of tasklet vs free list Dmitry Osipenko
2020-02-02 22:28 ` [PATCH v7 03/19] dmaengine: tegra-apb: Implement synchronization hook Dmitry Osipenko
2020-02-02 22:28 ` [PATCH v7 04/19] dmaengine: tegra-apb: Prevent race conditions on channel's freeing Dmitry Osipenko
2020-02-02 22:28 ` [PATCH v7 05/19] dmaengine: tegra-apb: Clean up tasklet releasing Dmitry Osipenko
2020-02-02 22:28 ` [PATCH v7 06/19] dmaengine: tegra-apb: Use devm_platform_ioremap_resource Dmitry Osipenko
2020-02-02 22:28 ` [PATCH v7 07/19] dmaengine: tegra-apb: Use devm_request_irq Dmitry Osipenko
2020-02-02 22:28 ` [PATCH v7 08/19] dmaengine: tegra-apb: Fix coding style problems Dmitry Osipenko
2020-02-02 22:28 ` [PATCH v7 09/19] dmaengine: tegra-apb: Remove unneeded initialization of tdc->config_init Dmitry Osipenko
2020-02-02 22:28 ` [PATCH v7 10/19] dmaengine: tegra-apb: Remove assumptions about unavailable runtime PM Dmitry Osipenko
2020-02-04 14:51   ` Jon Hunter
2020-02-02 22:28 ` [PATCH v7 11/19] dmaengine: tegra-apb: Remove pending_sg_req checking from tdc_start_head_req Dmitry Osipenko
2020-02-04 14:53   ` Jon Hunter
2020-02-02 22:28 ` [PATCH v7 12/19] dmaengine: tegra-apb: Remove handling of unrealistic error condition Dmitry Osipenko
2020-02-04 11:52   ` Jon Hunter
2020-02-04 22:17     ` Dmitry Osipenko
2020-02-02 22:28 ` Dmitry Osipenko [this message]
2020-02-04 12:02   ` [PATCH v7 13/19] dmaengine: tegra-apb: Don't stop cyclic DMA in a case of " Jon Hunter
2020-02-04 15:55     ` Dmitry Osipenko
2020-02-02 22:28 ` [PATCH v7 14/19] dmaengine: tegra-apb: Keep clock enabled only during of DMA transfer Dmitry Osipenko
2020-02-06 13:50   ` Jon Hunter
2020-02-06 14:31     ` Dmitry Osipenko
2020-02-06 14:33       ` Jon Hunter
2020-02-02 22:28 ` [PATCH v7 15/19] dmaengine: tegra-apb: Clean up suspend-resume Dmitry Osipenko
2020-02-02 22:28 ` [PATCH v7 16/19] dmaengine: tegra-apb: Add missing of_dma_controller_free Dmitry Osipenko
2020-02-02 22:28 ` [PATCH v7 17/19] dmaengine: tegra-apb: Allow to compile as a loadable kernel module Dmitry Osipenko
2020-02-02 22:28 ` [PATCH v7 18/19] dmaengine: tegra-apb: Remove MODULE_ALIAS Dmitry Osipenko
2020-02-02 22:28 ` [PATCH v7 19/19] dmaengine: tegra-apb: Support COMPILE_TEST Dmitry Osipenko

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