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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>
This commit is contained in:
Pradeep Goudagunta 2014-06-06 16:48:08 +05:30 committed by Greg Kroah-Hartman
parent 080029b149
commit 5e3dbfca3b
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/serial/serial-tegra.c
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@ -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;