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| author | Pradeep Goudagunta <pgoudagunta@nvidia.com> | 2014-06-06 16:48:08 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-07-10 15:53:20 -0700 |
| commit | 5e3dbfca3b14a4a2950255c1628cd53b384d963e (patch) | |
| tree | 179c7922d6132716bbf39ed758c3321b2bcb6264 /drivers/tty/serial/serial-tegra.c | |
| parent | 080029b149258b9ccb05f26ee5f5d18e359bce2d (diff) | |
| download | linux-5e3dbfca3b14a4a2950255c1628cd53b384d963e.tar.gz linux-5e3dbfca3b14a4a2950255c1628cd53b384d963e.tar.bz2 linux-5e3dbfca3b14a4a2950255c1628cd53b384d963e.zip | |
serial: tegra: update tx_circular buffer only when TX_DMA is in progress
When channel is require to stop transmit then update the Tx circular
buffer only when DMA based transfer is in progress. If there is no
DMA based transfer then no need to update the Tx buffer.
Signed-off-by: Pradeep Goudagunta <pgoudagunta@nvidia.com>
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/serial-tegra.c')
| -rw-r--r-- | drivers/tty/serial/serial-tegra.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c index d5c2a287b7e7..117d8d1382f9 100644 --- a/drivers/tty/serial/serial-tegra.c +++ b/drivers/tty/serial/serial-tegra.c @@ -482,6 +482,9 @@ static void tegra_uart_stop_tx(struct uart_port *u) struct dma_tx_state state; int count; + if (tup->tx_in_progress != TEGRA_UART_TX_DMA) + return; + dmaengine_terminate_all(tup->tx_dma_chan); dmaengine_tx_status(tup->tx_dma_chan, tup->tx_cookie, &state); count = tup->tx_bytes_requested - state.residue; |