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Patch "serial: sh-sci: Fix (AUTO)RTS in sci_init_pins()" has been added to the 4.11-stable tree

PATCH [email protected] 1 participant 1 message Jun 18, 2017

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This is a note to let you know that I've just added the patch titled

serial: sh-sci: Fix (AUTO)RTS in sci_init_pins()

to the 4.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
serial-sh-sci-fix-auto-rts-in-sci_init_pins.patch
and it can be found in the queue-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

Quoted 1 line

From cfa6eb239154315e6efcdda1d929e024097f927b Mon Sep 17 00:00:00 2001

From: Geert Uytterhoeven <[email protected]>
Date: Tue, 28 Mar 2017 11:13:46 +0200
Subject: serial: sh-sci: Fix (AUTO)RTS in sci_init_pins()

From: Geert Uytterhoeven <[email protected]>

commit cfa6eb239154315e6efcdda1d929e024097f927b upstream.

If a UART has dedicated RTS/CTS pins, and hardware control flow is disabled (or AUTORTS is not yet effective), changing any serial port configuration deasserts RTS, as .set_termios() calls sci_init_pins().

To fix this, consider the current (AUTO)RTS state when (re)initializing the pins. Note that for SCIFA/SCIFB, AUTORTS needs explicit configuration of the RTS# pin function, while (H)SCIF handles this automatically.

Fixes d2b9775d795ec05f ("serial: sh-sci: Correct pin initialization on (H)SCIF")
Fixes e9d7a45a03991349 ("serial: sh-sci: Add pin initialization for SCIFA/SCIFB")
---
 drivers/tty/serial/sh-sci.c |   25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)
drivers/tty/serial/sh-sci.c +19 -6
@@ -683,24 +683,37 @@ static void sci_init_pins(struct uart_po
 	}
 
 	if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) {
+		u16 data = serial_port_in(port, SCPDR);
 		u16 ctrl = serial_port_in(port, SCPCR);
 
 		/* Enable RXD and TXD pin functions */
 		ctrl &= ~(SCPCR_RXDC | SCPCR_TXDC);
 		if (to_sci_port(port)->has_rtscts) {
-			/* RTS# is output, driven 1 */
-			ctrl |= SCPCR_RTSC;
-			serial_port_out(port, SCPDR,
-				serial_port_in(port, SCPDR) | SCPDR_RTSD);
+			/* RTS# is output, active low, unless autorts */
+			if (!(port->mctrl & TIOCM_RTS)) {
+				ctrl |= SCPCR_RTSC;
+				data |= SCPDR_RTSD;
+			} else if (!s->autorts) {
+				ctrl |= SCPCR_RTSC;
+				data &= ~SCPDR_RTSD;
+			} else {
+				/* Enable RTS# pin function */
+				ctrl &= ~SCPCR_RTSC;
+			}
 			/* Enable CTS# pin function */
 			ctrl &= ~SCPCR_CTSC;
 		}
+		serial_port_out(port, SCPDR, data);
 		serial_port_out(port, SCPCR, ctrl);
 	} else if (sci_getreg(port, SCSPTR)->size) {
 		u16 status = serial_port_in(port, SCSPTR);
 
-		/* RTS# is output, driven 1 */
-		status |= SCSPTR_RTSIO | SCSPTR_RTSDT;
+		/* RTS# is always output; and active low, unless autorts */
+		status |= SCSPTR_RTSIO;
+		if (!(port->mctrl & TIOCM_RTS))
+			status |= SCSPTR_RTSDT;
+		else if (!s->autorts)
+			status &= ~SCSPTR_RTSDT;
 		/* CTS# and SCK are inputs */
 		status &= ~(SCSPTR_CTSIO | SCSPTR_SCKIO);
 		serial_port_out(port, SCSPTR, status);

Patches currently in stable-queue which might be from [email protected] are

queue-4.11/serial-sh-sci-fix-late-enablement-of-autorts.patch queue-4.11/serial-sh-sci-fix-auto-rts-in-sci_init_pins.patch