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From: Dmitry Osipenko <digetx@gmail.com>
To: Thierry Reding <thierry.reding@gmail.com>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	Laxman Dewangan <ldewangan@nvidia.com>,
	Mikko Perttunen <cyndis@kapsi.fi>,
	Wolfram Sang <wsa@the-dreams.de>
Cc: linux-i2c@vger.kernel.org, linux-tegra@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v4 7/8] i2c: tegra: Always terminate DMA transfer
Date: Sun, 12 Jan 2020 20:14:29 +0300	[thread overview]
Message-ID: <20200112171430.27219-8-digetx@gmail.com> (raw)
In-Reply-To: <20200112171430.27219-1-digetx@gmail.com>

It is possible that I2C could error out in the middle of DMA transfer and
in this case DMA channel needs to be reset, otherwise a follow up transfer
will fail because DMA channel stays blocked.

Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/i2c/busses/i2c-tegra.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 1a390e1bff72..3c7c86d4b0e4 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1220,11 +1220,12 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
 		time_left = tegra_i2c_wait_completion_timeout(
 				i2c_dev, &i2c_dev->dma_complete, xfer_time);
 
+		dmaengine_terminate_sync(i2c_dev->msg_read ?
+					 i2c_dev->rx_dma_chan :
+					 i2c_dev->tx_dma_chan);
+
 		if (time_left == 0) {
 			dev_err(i2c_dev->dev, "DMA transfer timeout\n");
-			dmaengine_terminate_sync(i2c_dev->msg_read ?
-						 i2c_dev->rx_dma_chan :
-						 i2c_dev->tx_dma_chan);
 			tegra_i2c_init(i2c_dev, true);
 			return -ETIMEDOUT;
 		}
@@ -1237,11 +1238,6 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
 			memcpy(i2c_dev->msg_buf, i2c_dev->dma_buf,
 			       msg->len);
 		}
-
-		if (i2c_dev->msg_err != I2C_ERR_NONE)
-			dmaengine_synchronize(i2c_dev->msg_read ?
-					      i2c_dev->rx_dma_chan :
-					      i2c_dev->tx_dma_chan);
 	}
 
 	time_left = tegra_i2c_wait_completion_timeout(
-- 
2.24.0

  parent reply	other threads:[~2020-01-12 17:14 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-12 17:14 [PATCH v4 0/8] NVIDIA Tegra I2C driver fixes and improvements Dmitry Osipenko
2020-01-12 17:14 ` [PATCH v4 2/8] i2c: tegra: Properly disable runtime PM on driver's probe error Dmitry Osipenko
2020-01-12 17:14 ` [PATCH v4 3/8] i2c: tegra: Prevent interrupt triggering after transfer timeout Dmitry Osipenko
2020-01-12 17:14 ` [PATCH v4 4/8] i2c: tegra: Support atomic transfers Dmitry Osipenko
2020-01-13 22:03   ` Wolfram Sang
2020-01-13 22:52     ` Dmitry Osipenko
2020-01-14  1:26       ` Dmitry Osipenko
2020-01-14  5:57       ` Wolfram Sang
2020-01-12 17:14 ` [PATCH v4 6/8] i2c: tegra: Use relaxed versions of readl/writel Dmitry Osipenko
2020-01-12 17:14 ` Dmitry Osipenko [this message]
     [not found] ` <20200112171430.27219-1-digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-01-12 17:14   ` [PATCH v4 1/8] i2c: tegra: Fix suspending in active runtime PM state Dmitry Osipenko
2020-01-12 17:14     ` Dmitry Osipenko
2020-01-12 17:14   ` [PATCH v4 5/8] i2c: tegra: Rename I2C_PIO_MODE_MAX_LEN to I2C_PIO_MODE_PREFERRED_LEN Dmitry Osipenko
2020-01-12 17:14     ` Dmitry Osipenko
2020-01-12 17:14   ` [PATCH v4 8/8] i2c: tegra: Check DMA completion status in addition to left time Dmitry Osipenko
2020-01-12 17:14     ` Dmitry Osipenko
2020-01-13 21:53   ` [PATCH v4 0/8] NVIDIA Tegra I2C driver fixes and improvements Wolfram Sang
2020-01-13 21:53     ` Wolfram Sang
2020-01-13 23:01     ` Dmitry Osipenko

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