diff options
| author |   Dmitry Osipenko <digetx@gmail.com> | 2020-01-14 04:34:41 +0300 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2020-01-15 18:32:29 +0100 |
| commit | 28d98666dbc033e8834edcba75dc1984efde0279 (patch) | |
| tree | a8ee0fc1c5c03ed2e2d96691bbaf5b8924b99562 /drivers/i2c | |
| parent | i2c: tegra: Use relaxed versions of readl/writel (diff) | |
| download | linux-dev-28d98666dbc033e8834edcba75dc1984efde0279.tar.xz linux-dev-28d98666dbc033e8834edcba75dc1984efde0279.zip | |
i2c: tegra: Always terminate DMA transfer
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>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-tegra.c | 12 |
1 files 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( |