diff options
Diffstat (limited to 'target/linux/imx6/patches-4.4/110-serial-imx-repair-and-complete-handshaking.patch')
| -rw-r--r-- | target/linux/imx6/patches-4.4/110-serial-imx-repair-and-complete-handshaking.patch | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/target/linux/imx6/patches-4.4/110-serial-imx-repair-and-complete-handshaking.patch b/target/linux/imx6/patches-4.4/110-serial-imx-repair-and-complete-handshaking.patch new file mode 100644 index 0000000000..0a117f668f --- /dev/null +++ b/target/linux/imx6/patches-4.4/110-serial-imx-repair-and-complete-handshaking.patch @@ -0,0 +1,78 @@ +From 90ebc4838666d148eac5bbac6f4044e5b25cd2d6 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de> +Date: Sun, 18 Oct 2015 21:34:46 +0200 +Subject: [PATCH] serial: imx: repair and complete handshaking +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +The .get_mctrl callback should not report the status of RTS or LOOP, so +drop this. Instead implement reporting the state of CAR (aka DCD) and +RI. + +For .set_mctrl implement setting the DTR line. + +Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +Signed-off-by: Petr Štetiar <ynezz@true.cz> +--- + drivers/tty/serial/imx.c | 23 +++++++++++++++++------ + 1 file changed, 17 insertions(+), 6 deletions(-) + +diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c +index 76818f5..086675e 100644 +--- a/drivers/tty/serial/imx.c ++++ b/drivers/tty/serial/imx.c +@@ -148,8 +148,11 @@ + #define USR2_TXFE (1<<14) /* Transmit buffer FIFO empty */ + #define USR2_DTRF (1<<13) /* DTR edge interrupt flag */ + #define USR2_IDLE (1<<12) /* Idle condition */ ++#define USR2_RIDELT (1<<10) /* Ring Interrupt Delta */ ++#define USR2_RIIN (1<<9) /* Ring Indicator Input */ + #define USR2_IRINT (1<<8) /* Serial infrared interrupt flag */ + #define USR2_WAKE (1<<7) /* Wake */ ++#define USR2_DCDIN (1<<5) /* Data Carrier Detect Input */ + #define USR2_RTSF (1<<4) /* RTS edge interrupt flag */ + #define USR2_TXDC (1<<3) /* Transmitter complete */ + #define USR2_BRCD (1<<2) /* Break condition */ +@@ -804,16 +807,19 @@ static unsigned int imx_tx_empty(struct uart_port *port) + static unsigned int imx_get_mctrl(struct uart_port *port) + { + struct imx_port *sport = (struct imx_port *)port; +- unsigned int tmp = TIOCM_DSR | TIOCM_CAR; ++ unsigned int tmp = TIOCM_DSR; ++ unsigned usr1 = readl(sport->port.membase + USR1); + +- if (readl(sport->port.membase + USR1) & USR1_RTSS) ++ if (usr1 & USR1_RTSS) + tmp |= TIOCM_CTS; + +- if (readl(sport->port.membase + UCR2) & UCR2_CTS) +- tmp |= TIOCM_RTS; ++ /* in DCE mode DCDIN is always 0 */ ++ if (!(usr1 & USR2_DCDIN)) ++ tmp |= TIOCM_CAR; + +- if (readl(sport->port.membase + uts_reg(sport)) & UTS_LOOP) +- tmp |= TIOCM_LOOP; ++ /* in DCE mode RIIN is always 0 */ ++ if (readl(sport->port.membase + USR2) & USR2_RIIN) ++ tmp |= TIOCM_RI; + + return tmp; + } +@@ -831,6 +837,11 @@ static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl) + writel(temp, sport->port.membase + UCR2); + } + ++ temp = readl(sport->port.membase + UCR3) & ~UCR3_DSR; ++ if (!(mctrl & TIOCM_DTR)) ++ temp |= UCR3_DSR; ++ writel(temp, sport->port.membase + UCR3); ++ + temp = readl(sport->port.membase + uts_reg(sport)) & ~UTS_LOOP; + if (mctrl & TIOCM_LOOP) + temp |= UTS_LOOP; +-- +1.9.1 + |