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authorSergey Organov <sorganov@gmail.com>2019-08-28 21:37:55 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-09-04 13:43:55 +0300
commitc514a6f848b5bd991c908a395ba4e49a307a4ca7 (patch)
treed5b16e0026a051fa15ed352482237c32662356fb /drivers/tty
parentd47bcb4a6cf0be5f3b390fe3fc12416034f86ae2 (diff)
downloadlinux-c514a6f848b5bd991c908a395ba4e49a307a4ca7.tar.xz
serial: imx: use Tx ready rather than Tx empty irq
This should help to avoid unnecessary gaps in transmission while adding little overhead due to low default Tx threshold level (2 bytes). Signed-off-by: Sergey Organov <sorganov@gmail.com> Link: https://lore.kernel.org/r/1567017475-11919-6-git-send-email-sorganov@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/imx.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index e89045a085fb..87c58f9f6390 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -439,7 +439,7 @@ static void imx_uart_stop_tx(struct uart_port *port)
return;
ucr1 = imx_uart_readl(sport, UCR1);
- imx_uart_writel(sport, ucr1 & ~UCR1_TXMPTYEN, UCR1);
+ imx_uart_writel(sport, ucr1 & ~UCR1_TRDYEN, UCR1);
/* in rs485 mode disable transmitter if shifter is empty */
if (port->rs485.flags & SER_RS485_ENABLED &&
@@ -517,7 +517,7 @@ static inline void imx_uart_transmit_buffer(struct imx_port *sport)
* and the TX IRQ is disabled.
**/
ucr1 = imx_uart_readl(sport, UCR1);
- ucr1 &= ~UCR1_TXMPTYEN;
+ ucr1 &= ~UCR1_TRDYEN;
if (sport->dma_is_txing) {
ucr1 |= UCR1_TXDMAEN;
imx_uart_writel(sport, ucr1, UCR1);
@@ -679,7 +679,7 @@ static void imx_uart_start_tx(struct uart_port *port)
if (!sport->dma_is_enabled) {
ucr1 = imx_uart_readl(sport, UCR1);
- imx_uart_writel(sport, ucr1 | UCR1_TXMPTYEN, UCR1);
+ imx_uart_writel(sport, ucr1 | UCR1_TRDYEN, UCR1);
}
if (sport->dma_is_enabled) {
@@ -688,7 +688,7 @@ static void imx_uart_start_tx(struct uart_port *port)
* disable TX DMA to let TX interrupt to send X-char */
ucr1 = imx_uart_readl(sport, UCR1);
ucr1 &= ~UCR1_TXDMAEN;
- ucr1 |= UCR1_TXMPTYEN;
+ ucr1 |= UCR1_TRDYEN;
imx_uart_writel(sport, ucr1, UCR1);
return;
}
@@ -874,7 +874,7 @@ static irqreturn_t imx_uart_int(int irq, void *dev_id)
usr1 &= ~USR1_RRDY;
if ((ucr2 & UCR2_ATEN) == 0)
usr1 &= ~USR1_AGTIM;
- if ((ucr1 & UCR1_TXMPTYEN) == 0)
+ if ((ucr1 & UCR1_TRDYEN) == 0)
usr1 &= ~USR1_TRDY;
if ((ucr4 & UCR4_TCEN) == 0)
usr2 &= ~USR2_TXDC;
@@ -1474,7 +1474,7 @@ static void imx_uart_shutdown(struct uart_port *port)
spin_lock_irqsave(&sport->port.lock, flags);
ucr1 = imx_uart_readl(sport, UCR1);
- ucr1 &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN | UCR1_RXDMAEN | UCR1_ATDMAEN);
+ ucr1 &= ~(UCR1_TRDYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN | UCR1_RXDMAEN | UCR1_ATDMAEN);
imx_uart_writel(sport, ucr1, UCR1);
spin_unlock_irqrestore(&sport->port.lock, flags);
@@ -1778,7 +1778,7 @@ static int imx_uart_poll_init(struct uart_port *port)
ucr1 |= IMX1_UCR1_UARTCLKEN;
ucr1 |= UCR1_UARTEN;
- ucr1 &= ~(UCR1_TXMPTYEN | UCR1_RTSDEN | UCR1_RRDYEN);
+ ucr1 &= ~(UCR1_TRDYEN | UCR1_RTSDEN | UCR1_RRDYEN);
ucr2 |= UCR2_RXEN;
ucr2 &= ~UCR2_ATEN;
@@ -1938,7 +1938,7 @@ imx_uart_console_write(struct console *co, const char *s, unsigned int count)
if (imx_uart_is_imx1(sport))
ucr1 |= IMX1_UCR1_UARTCLKEN;
ucr1 |= UCR1_UARTEN;
- ucr1 &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);
+ ucr1 &= ~(UCR1_TRDYEN | UCR1_RRDYEN | UCR1_RTSDEN);
imx_uart_writel(sport, ucr1, UCR1);
@@ -2294,7 +2294,7 @@ static int imx_uart_probe(struct platform_device *pdev)
/* Disable interrupts before requesting them */
ucr1 = imx_uart_readl(sport, UCR1);
ucr1 &= ~(UCR1_ADEN | UCR1_TRDYEN | UCR1_IDEN | UCR1_RRDYEN |
- UCR1_TXMPTYEN | UCR1_RTSDEN);
+ UCR1_TRDYEN | UCR1_RTSDEN);
imx_uart_writel(sport, ucr1, UCR1);
if (!imx_uart_is_imx1(sport) && sport->dte_mode) {