diff options
| author | Shardar Shariff Md <smohammed@nvidia.com> | 2019-09-04 10:12:56 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-05 10:00:03 +0200 |
| commit | 33ae787b74fc0e1dfe6bb998c7e4d1c2369a8776 (patch) | |
| tree | 2003717839b4c5a66c02a82eaa673ae9741753c5 /drivers/tty | |
| parent | 9c801e313195addaf11c16e155f50789d6ebfd19 (diff) | |
serial: tegra: add support to ignore read
Add support to ignore read characters if CREAD flag is not set.
Signed-off-by: Shardar Shariff Md <smohammed@nvidia.com>
Signed-off-by: Krishna Yarlagadda <kyarlagadda@nvidia.com>
Link: https://lore.kernel.org/r/1567572187-29820-2-git-send-email-kyarlagadda@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/serial-tegra.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c index 82a8d5130cbc..9c15c87fa9e5 100644 --- a/drivers/tty/serial/serial-tegra.c +++ b/drivers/tty/serial/serial-tegra.c @@ -547,6 +547,9 @@ static void tegra_uart_handle_rx_pio(struct tegra_uart_port *tup, if (!uart_handle_sysrq_char(&tup->uport, ch) && tty) tty_insert_flip_char(tty, ch, flag); + + if (tup->uport.ignore_status_mask & UART_LSR_DR) + continue; } while (1); } @@ -565,6 +568,10 @@ static void tegra_uart_copy_rx_to_tty(struct tegra_uart_port *tup, dev_err(tup->uport.dev, "No tty port\n"); return; } + + if (tup->uport.ignore_status_mask & UART_LSR_DR) + return; + dma_sync_single_for_cpu(tup->uport.dev, tup->rx_dma_buf_phys, TEGRA_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE); copied = tty_insert_flip_string(tty, @@ -1193,6 +1200,11 @@ static void tegra_uart_set_termios(struct uart_port *u, tegra_uart_write(tup, tup->ier_shadow, UART_IER); tegra_uart_read(tup, UART_IER); + tup->uport.ignore_status_mask = 0; + /* Ignore all characters if CREAD is not set */ + if ((termios->c_cflag & CREAD) == 0) + tup->uport.ignore_status_mask |= UART_LSR_DR; + spin_unlock_irqrestore(&u->lock, flags); } |