[PATCH 02/14] serial: tegra: add support to ignore read
From: Krishna Yarlagadda <hidden>
Date: 2019-08-12 11:28:47
Also in:
linux-serial, linux-tegra, lkml
Subsystem:
tegra serial driver, the rest, tty layer and serial drivers · Maintainers:
Laxman Dewangan, Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
From: Shardar Shariff Md <redacted> Add support to ignore read characters if CREAD flag is not set. Signed-off-by: Shardar Shariff Md <redacted> Signed-off-by: Krishna Yarlagadda <redacted> --- drivers/tty/serial/serial-tegra.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
index 19f4c24..93d299e 100644
--- a/drivers/tty/serial/serial-tegra.c
+++ b/drivers/tty/serial/serial-tegra.c@@ -542,6 +542,9 @@ static void tegra_uart_handle_rx_pio(struct tegra_uart_port *tup, ch = (unsigned char) tegra_uart_read(tup, UART_RX); tup->uport.icount.rx++; + if (tup->uport.ignore_status_mask & UART_LSR_DR) + continue; + if (!uart_handle_sysrq_char(&tup->uport, ch) && tty) tty_insert_flip_char(tty, ch, flag); } while (1);
@@ -562,6 +565,10 @@ 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,
@@ -1190,6 +1197,11 @@ 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); }
--
2.7.4