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| author | Kartik <kkartik@nvidia.com> | 2022-10-18 20:28:06 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-18 11:30:24 +0100 |
| commit | 7c0b0107a5371cd720680bf88a8ce84033e6a4a3 (patch) | |
| tree | 2300cc05a80ab2b26cc5f349fd70689df81038db /drivers/tty | |
| parent | 94bf6360b2ae8031972e69354644d7d38ff5e90e (diff) | |
| download | linux-stable-7c0b0107a5371cd720680bf88a8ce84033e6a4a3.tar.gz linux-stable-7c0b0107a5371cd720680bf88a8ce84033e6a4a3.tar.bz2 linux-stable-7c0b0107a5371cd720680bf88a8ce84033e6a4a3.zip | |
serial: tegra: Read DMA status before terminating
[ Upstream commit 109a951a9f1fd8a34ebd1896cbbd5d5cede880a7 ]
Read the DMA status before terminating the DMA, as doing so deletes
the DMA desc.
Also, to get the correct transfer status information, pause the DMA
using dmaengine_pause() before reading the DMA status.
Fixes: e9ea096dd225 ("serial: tegra: add serial driver")
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
Signed-off-by: Kartik <kkartik@nvidia.com>
Link: https://lore.kernel.org/r/1666105086-17326-1-git-send-email-kkartik@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/serial-tegra.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c index 1d957144117e..cc613240a351 100644 --- a/drivers/tty/serial/serial-tegra.c +++ b/drivers/tty/serial/serial-tegra.c @@ -570,8 +570,9 @@ static void tegra_uart_stop_tx(struct uart_port *u) if (tup->tx_in_progress != TEGRA_UART_TX_DMA) return; - dmaengine_terminate_all(tup->tx_dma_chan); + dmaengine_pause(tup->tx_dma_chan); dmaengine_tx_status(tup->tx_dma_chan, tup->tx_cookie, &state); + dmaengine_terminate_all(tup->tx_dma_chan); count = tup->tx_bytes_requested - state.residue; async_tx_ack(tup->tx_dma_desc); uart_xmit_advance(&tup->uport, count); @@ -697,8 +698,9 @@ static void tegra_uart_terminate_rx_dma(struct tegra_uart_port *tup) if (!tup->rx_dma_active) return; - dmaengine_terminate_all(tup->rx_dma_chan); + dmaengine_pause(tup->rx_dma_chan); dmaengine_tx_status(tup->rx_dma_chan, tup->rx_cookie, &state); + dmaengine_terminate_all(tup->rx_dma_chan); tegra_uart_rx_buffer_push(tup, state.residue); tup->rx_dma_active = false; |