diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/serial/serial-tegra.c | 66 |
1 files changed, 24 insertions, 42 deletions
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c index 11aa5e1e3705..1d6fc60ed013 100644 --- a/drivers/tty/serial/serial-tegra.c +++ b/drivers/tty/serial/serial-tegra.c @@ -569,13 +569,30 @@ static void tegra_uart_copy_rx_to_tty(struct tegra_uart_port *tup, TEGRA_UART_RX_DMA_BUFFER_SIZE, DMA_TO_DEVICE); } +static void tegra_uart_rx_buffer_push(struct tegra_uart_port *tup, + unsigned int residue) +{ + struct tty_port *port = &tup->uport.state->port; + struct tty_struct *tty = tty_port_tty_get(port); + unsigned int count; + + async_tx_ack(tup->rx_dma_desc); + count = tup->rx_bytes_requested - residue; + + /* If we are here, DMA is stopped */ + tegra_uart_copy_rx_to_tty(tup, port, count); + + tegra_uart_handle_rx_pio(tup, port); + if (tty) { + tty_flip_buffer_push(port); + tty_kref_put(tty); + } +} + static void tegra_uart_rx_dma_complete(void *args) { struct tegra_uart_port *tup = args; struct uart_port *u = &tup->uport; - unsigned int count = tup->rx_bytes_requested; - struct tty_struct *tty = tty_port_tty_get(&tup->uport.state->port); - struct tty_port *port = &u->state->port; unsigned long flags; struct dma_tx_state state; enum dma_status status; @@ -589,20 +606,11 @@ static void tegra_uart_rx_dma_complete(void *args) goto done; } - async_tx_ack(tup->rx_dma_desc); - /* Deactivate flow control to stop sender */ if (tup->rts_active) set_rts(tup, false); - /* If we are here, DMA is stopped */ - tegra_uart_copy_rx_to_tty(tup, port, count); - - tegra_uart_handle_rx_pio(tup, port); - if (tty) { - tty_flip_buffer_push(port); - tty_kref_put(tty); - } + tegra_uart_rx_buffer_push(tup, 0); tegra_uart_start_rx_dma(tup); /* Activate flow control to start transfer */ @@ -616,27 +624,14 @@ done: static void tegra_uart_handle_rx_dma(struct tegra_uart_port *tup) { struct dma_tx_state state; - struct tty_struct *tty = tty_port_tty_get(&tup->uport.state->port); - struct tty_port *port = &tup->uport.state->port; - unsigned int count; /* Deactivate flow control to stop sender */ if (tup->rts_active) set_rts(tup, false); dmaengine_terminate_all(tup->rx_dma_chan); - dmaengine_tx_status(tup->rx_dma_chan, tup->rx_cookie, &state); - async_tx_ack(tup->rx_dma_desc); - count = tup->rx_bytes_requested - state.residue; - - /* If we are here, DMA is stopped */ - tegra_uart_copy_rx_to_tty(tup, port, count); - - tegra_uart_handle_rx_pio(tup, port); - if (tty) { - tty_flip_buffer_push(port); - tty_kref_put(tty); - } + dmaengine_tx_status(tup->rx_dma_chan, tup->rx_cookie, &state); + tegra_uart_rx_buffer_push(tup, state.residue); tegra_uart_start_rx_dma(tup); if (tup->rts_active) @@ -755,11 +750,8 @@ static irqreturn_t tegra_uart_isr(int irq, void *data) static void tegra_uart_stop_rx(struct uart_port *u) { struct tegra_uart_port *tup = to_tegra_uport(u); - struct tty_struct *tty; - struct tty_port *port = &u->state->port; struct dma_tx_state state; unsigned long ier; - int count; if (tup->rts_active) set_rts(tup, false); @@ -767,8 +759,6 @@ static void tegra_uart_stop_rx(struct uart_port *u) if (!tup->rx_in_progress) return; - tty = tty_port_tty_get(&tup->uport.state->port); - tegra_uart_wait_sym_time(tup, 1); /* wait a character interval */ ier = tup->ier_shadow; @@ -779,15 +769,7 @@ static void tegra_uart_stop_rx(struct uart_port *u) tup->rx_in_progress = 0; dmaengine_terminate_all(tup->rx_dma_chan); dmaengine_tx_status(tup->rx_dma_chan, tup->rx_cookie, &state); - async_tx_ack(tup->rx_dma_desc); - count = tup->rx_bytes_requested - state.residue; - tegra_uart_copy_rx_to_tty(tup, port, count); - tegra_uart_handle_rx_pio(tup, port); - - if (tty) { - tty_flip_buffer_push(port); - tty_kref_put(tty); - } + tegra_uart_rx_buffer_push(tup, state.residue); } static void tegra_uart_hw_deinit(struct tegra_uart_port *tup) |