From: Peter Hurley <peter@hurleysoftware.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.cz>,
linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org,
Felipe Balbi <balbi@ti.com>, Tony Lindgren <tony@atomide.com>,
linux-omap@vger.kernel.org,
Peter Hurley <peter@hurleysoftware.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: [PATCH] serial: omap_8250: Fix RTS handling, part B
Date: Wed, 31 Dec 2014 16:32:49 -0500 [thread overview]
Message-ID: <1420061569-502-1-git-send-email-peter@hurleysoftware.com> (raw)
Because the OMAP3 UART ignores MCR[1] (RTS) in autoRTS mode, autoRTS
mode must not be enabled unless RTS is set (or port->mctrl & TIOCM_RTS,
which is equivalent).
Fixes premature raising of RTS in omap_8250_set_termios() -- RTS was
raised even before UART mode was selected.
Fixes raise of RTS after port has been shutdown; omap_8250_pm() re-enabled
RTS after omap_8250_shutdown().
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
---
drivers/tty/serial/8250/8250_omap.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 428f384..316c37b 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -272,7 +272,10 @@ static void omap8250_restore_regs(struct uart_8250_port *up)
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
serial_dl_write(up, priv->quot);
- serial_out(up, UART_EFR, priv->efr);
+ if (up->port.mctrl & TIOCM_RTS)
+ serial_out(up, UART_EFR, priv->efr);
+ else
+ serial_out(up, UART_EFR, priv->efr & ~UART_EFR_RTS);
/* Configure flow control */
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
@@ -468,18 +471,18 @@ static void omap_8250_set_termios(struct uart_port *port,
static void omap_8250_pm(struct uart_port *port, unsigned int state,
unsigned int oldstate)
{
- struct uart_8250_port *up =
- container_of(port, struct uart_8250_port, port);
- struct omap8250_priv *priv = up->port.private_data;
+ struct uart_8250_port *up = up_to_u8250p(port);
+ u8 efr;
pm_runtime_get_sync(port->dev);
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
- serial_out(up, UART_EFR, priv->efr | UART_EFR_ECB);
+ efr = serial_in(up, UART_EFR);
+ serial_out(up, UART_EFR, efr | UART_EFR_ECB);
serial_out(up, UART_LCR, 0);
serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
- serial_out(up, UART_EFR, priv->efr);
+ serial_out(up, UART_EFR, efr);
serial_out(up, UART_LCR, 0);
pm_runtime_mark_last_busy(port->dev);
--
2.2.1
reply other threads:[~2014-12-31 21:32 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1420061569-502-1-git-send-email-peter@hurleysoftware.com \
--to=peter@hurleysoftware.com \
--cc=balbi@ti.com \
--cc=bigeasy@linutronix.de \
--cc=gregkh@linuxfoundation.org \
--cc=jslaby@suse.cz \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-omap@vger.kernel.org \
--cc=linux-serial@vger.kernel.org \
--cc=tony@atomide.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).