From: Sergey Organov <sorganov@gmail.com>
To: linux-serial@vger.kernel.org
Cc: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Sascha Hauer" <s.hauer@pengutronix.de>,
"Sergey Organov" <sorganov@gmail.com>,
"NXP Linux Team" <linux-imx@nxp.com>,
"Pengutronix Kernel Team" <kernel@pengutronix.de>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 2/5] serial: imx: do not stop Rx/Tx on termios change
Date: Wed, 28 Aug 2019 21:37:52 +0300 [thread overview]
Message-ID: <1567017475-11919-3-git-send-email-sorganov@gmail.com> (raw)
In-Reply-To: <1567017475-11919-1-git-send-email-sorganov@gmail.com>
imx_set_termios(): stopping receiver and transmitter does harm when
something that doesn't touch transmission format/rate changes, such as
RTS/CTS handshake.
OTOH, it does no good on baud rate or format change, as
synchronization on upper-level protocols is still required to do it
right.
Therefore, just stop doing it.
Signed-off-by: Sergey Organov <sorganov@gmail.com>
---
drivers/tty/serial/imx.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 47b6156..fa723a9a 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1652,9 +1652,6 @@ imx_uart_set_termios(struct uart_port *port, struct ktermios *termios,
UCR1);
imx_uart_writel(sport, old_ucr2 & ~UCR2_ATEN, UCR2);
- /* then, disable everything */
- imx_uart_writel(sport, old_ucr2 & ~(UCR2_TXEN | UCR2_RXEN | UCR2_ATEN), UCR2);
-
/* custom-baudrate handling */
div = sport->port.uartclk / (baud * 16);
if (baud == 38400 && quot != div)
--
2.10.0.1.g57b01a3
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next prev parent reply other threads:[~2019-08-28 18:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190530152950.25377-1-sorganov@gmail.com>
2019-08-28 18:37 ` [PATCH v2 0/5] Serial: imx: various fixes Sergey Organov
2019-08-28 18:37 ` [PATCH v2 1/5] serial: imx: get rid of unbounded busy-waiting loop Sergey Organov
2019-08-28 18:37 ` Sergey Organov [this message]
2019-08-28 18:37 ` [PATCH v2 3/5] serial: imx: do not disable individual irqs during termios change Sergey Organov
2019-08-28 18:37 ` [PATCH v2 4/5] serial: imx: fix data breakage on " Sergey Organov
2019-08-28 18:37 ` [PATCH v2 5/5] serial: imx: use Tx ready rather than Tx empty irq Sergey Organov
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