From: Sergey Organov <sorganov@gmail.com> To: Sascha Hauer <s.hauer@pengutronix.de> Cc: "Pengutronix Kernel Team" <kernel@pengutronix.de>, "NXP Linux Team" <linux-imx@nxp.com>, linux-arm-kernel@lists.infradead.org, linux-serial@vger.kernel.org, "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de> Subject: [PATCH RFC v1 6/7] serial: imx: set_mctrl(): correctly restore autoRTS state Date: Thu, 20 Jun 2019 17:47:52 +0300 [thread overview] Message-ID: <1561042073-617-7-git-send-email-sorganov@gmail.com> (raw) In-Reply-To: <1561042073-617-1-git-send-email-sorganov@gmail.com> imx_uart_set_mctrl() happened to set UCR2_CTSC bit whenever TIOCM_RTS was set, no matter if RTS/CTS handshake is enabled or not. Now fixed by turning handshake on only when CRTSCTS bit for the port is set. Signed-off-by: Sergey Organov <sorganov@gmail.com> --- drivers/tty/serial/imx.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 4867f80..171347d 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -970,10 +970,19 @@ static void imx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) if (!(port->rs485.flags & SER_RS485_ENABLED)) { u32 ucr2; + /* + * Turn off autoRTS (UCR2_CTSC) if RTS is lowered and restore + * autoRTS setting if RTS is raised. Inverted UCR2_IRTS is set + * if and only if CRTSCTS bit is set for the port, so we use it + * to get the state to restore to. + */ ucr2 = imx_uart_readl(sport, UCR2); ucr2 &= ~(UCR2_CTS | UCR2_CTSC); - if (mctrl & TIOCM_RTS) - ucr2 |= UCR2_CTS | UCR2_CTSC; + if (mctrl & TIOCM_RTS) { + ucr2 |= UCR2_CTS; + if (!(ucr2 & UCR2_IRTS)) + ucr2 |= UCR2_CTSC; + } imx_uart_writel(sport, ucr2, UCR2); } -- 2.10.0.1.g57b01a3
WARNING: multiple messages have this Message-ID (diff)
From: Sergey Organov <sorganov@gmail.com> To: Sascha Hauer <s.hauer@pengutronix.de> Cc: "Pengutronix Kernel Team" <kernel@pengutronix.de>, "NXP Linux Team" <linux-imx@nxp.com>, linux-arm-kernel@lists.infradead.org, linux-serial@vger.kernel.org, "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de> Subject: [PATCH RFC v1 6/7] serial: imx: set_mctrl(): correctly restore autoRTS state Date: Thu, 20 Jun 2019 17:47:52 +0300 [thread overview] Message-ID: <1561042073-617-7-git-send-email-sorganov@gmail.com> (raw) In-Reply-To: <1561042073-617-1-git-send-email-sorganov@gmail.com> imx_uart_set_mctrl() happened to set UCR2_CTSC bit whenever TIOCM_RTS was set, no matter if RTS/CTS handshake is enabled or not. Now fixed by turning handshake on only when CRTSCTS bit for the port is set. Signed-off-by: Sergey Organov <sorganov@gmail.com> --- drivers/tty/serial/imx.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 4867f80..171347d 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -970,10 +970,19 @@ static void imx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) if (!(port->rs485.flags & SER_RS485_ENABLED)) { u32 ucr2; + /* + * Turn off autoRTS (UCR2_CTSC) if RTS is lowered and restore + * autoRTS setting if RTS is raised. Inverted UCR2_IRTS is set + * if and only if CRTSCTS bit is set for the port, so we use it + * to get the state to restore to. + */ ucr2 = imx_uart_readl(sport, UCR2); ucr2 &= ~(UCR2_CTS | UCR2_CTSC); - if (mctrl & TIOCM_RTS) - ucr2 |= UCR2_CTS | UCR2_CTSC; + if (mctrl & TIOCM_RTS) { + ucr2 |= UCR2_CTS; + if (!(ucr2 & UCR2_IRTS)) + ucr2 |= UCR2_CTSC; + } imx_uart_writel(sport, ucr2, UCR2); } -- 2.10.0.1.g57b01a3 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-06-20 14:47 UTC|newest] Thread overview: 154+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-06-14 7:28 [PATCH] serial: imx: fix RTS/CTS setting Sascha Hauer 2019-06-14 7:28 ` Sascha Hauer 2019-06-14 7:48 ` Uwe Kleine-König 2019-06-14 7:48 ` Uwe Kleine-König 2019-06-14 12:11 ` [PATCH RFC 0/7] serial: imx: fix RTS and RTS/CTS handling Sergey Organov 2019-06-14 12:11 ` Sergey Organov 2019-06-14 12:11 ` [PATCH RFC 1/7] serial: imx: fix locking in set_termios() Sergey Organov 2019-06-14 12:11 ` Sergey Organov 2019-06-14 12:11 ` [PATCH RFC 2/7] serial: imx: set_termios(): factor-out 'ucr2' initial value Sergey Organov 2019-06-14 12:11 ` Sergey Organov 2019-06-14 12:11 ` [PATCH RFC 3/7] serial: imx: set_termios(): clarify RTS/CTS bits calculation Sergey Organov 2019-06-14 12:11 ` Sergey Organov 2019-06-14 12:11 ` [PATCH RFC 4/7] serial: imx: set_termios(): do not enable autoRTS if RTS is unset Sergey Organov 2019-06-14 12:11 ` Sergey Organov 2019-06-20 9:37 ` Sascha Hauer 2019-06-20 9:37 ` Sascha Hauer 2019-06-20 13:24 ` Sergey Organov 2019-06-20 13:24 ` Sergey Organov 2019-06-14 12:11 ` [PATCH RFC 5/7] serial: imx: set_termios(): preserve RTS state Sergey Organov 2019-06-14 12:11 ` Sergey Organov 2019-06-14 13:05 ` Lothar Waßmann 2019-06-14 13:28 ` Sergey Organov 2019-06-14 12:11 ` [PATCH RFC 6/7] serial: imx: set_mctrl(): correctly restore autoRTS state Sergey Organov 2019-06-14 12:11 ` Sergey Organov 2019-06-14 12:11 ` [PATCH RFC 7/7] serial: imx: get rid of imx_uart_rts_auto() Sergey Organov 2019-06-14 12:11 ` Sergey Organov 2019-06-20 14:47 ` [PATCH RFC v1 0/7] serial: imx: fix RTS and RTS/CTS handling Sergey Organov 2019-06-20 14:47 ` [PATCH RFC v1 1/7] serial: imx: fix locking in set_termios() Sergey Organov 2019-06-20 14:47 ` Sergey Organov 2019-06-20 14:47 ` [PATCH RFC v1 2/7] serial: imx: set_termios(): factor-out 'ucr2' initial value Sergey Organov 2019-06-20 14:47 ` Sergey Organov 2019-06-20 14:47 ` [PATCH RFC v1 3/7] serial: imx: set_termios(): clarify RTS/CTS bits calculation Sergey Organov 2019-06-20 14:47 ` Sergey Organov 2019-06-20 14:47 ` [PATCH RFC v1 4/7] serial: imx: set_termios(): preserve RTS state Sergey Organov 2019-06-20 14:47 ` Sergey Organov 2019-06-20 14:47 ` [PATCH RFC v1 5/7] serial: imx: set_termios(): do not enable autoRTS if RTS is unset Sergey Organov 2019-06-20 14:47 ` Sergey Organov 2019-06-20 14:47 ` Sergey Organov [this message] 2019-06-20 14:47 ` [PATCH RFC v1 6/7] serial: imx: set_mctrl(): correctly restore autoRTS state Sergey Organov 2019-06-20 14:47 ` [PATCH RFC v1 7/7] serial: imx: get rid of imx_uart_rts_auto() Sergey Organov 2019-06-20 14:47 ` Sergey Organov 2019-06-26 10:00 ` [PATCH RFC v1 0/7] serial: imx: fix RTS and RTS/CTS handling Sascha Hauer 2019-06-26 10:00 ` Sascha Hauer 2019-06-26 11:19 ` Sergey Organov 2019-06-26 11:19 ` Sergey Organov 2019-06-26 14:11 ` [PATCH v2 " Sergey Organov 2019-06-26 14:11 ` [PATCH v2 1/7] serial: imx: fix locking in set_termios() Sergey Organov 2019-06-26 14:11 ` Sergey Organov 2019-06-27 5:05 ` Uwe Kleine-König 2019-06-27 5:05 ` Uwe Kleine-König 2019-06-26 14:11 ` [PATCH v2 2/7] serial: imx: set_termios(): factor-out 'ucr2' initial value Sergey Organov 2019-06-26 14:11 ` Sergey Organov 2019-06-27 5:05 ` Uwe Kleine-König 2019-06-27 5:05 ` Uwe Kleine-König 2019-06-26 14:11 ` [PATCH v2 3/7] serial: imx: set_termios(): clarify RTS/CTS bits calculation Sergey Organov 2019-06-26 14:11 ` Sergey Organov 2019-06-27 5:26 ` Uwe Kleine-König 2019-06-27 5:26 ` Uwe Kleine-König 2019-06-27 5:58 ` Sergey Organov 2019-06-26 14:11 ` [PATCH v2 4/7] serial: imx: set_termios(): preserve RTS state Sergey Organov 2019-06-26 14:11 ` Sergey Organov 2019-06-27 5:40 ` Uwe Kleine-König 2019-06-27 5:40 ` Uwe Kleine-König 2019-06-27 6:15 ` Sergey Organov 2019-06-26 14:11 ` [PATCH v2 5/7] serial: imx: set_termios(): do not enable autoRTS if RTS is unset Sergey Organov 2019-06-26 14:11 ` Sergey Organov 2019-06-27 5:47 ` Uwe Kleine-König 2019-06-27 5:47 ` Uwe Kleine-König 2019-06-27 6:16 ` Sergey Organov 2019-06-26 14:11 ` [PATCH v2 6/7] serial: imx: set_mctrl(): correctly restore autoRTS state Sergey Organov 2019-06-26 14:11 ` Sergey Organov 2019-06-27 6:05 ` Uwe Kleine-König 2019-06-27 6:05 ` Uwe Kleine-König 2019-06-27 7:01 ` Sergey Organov 2019-06-26 14:11 ` [PATCH v2 7/7] serial: imx: get rid of imx_uart_rts_auto() Sergey Organov 2019-06-26 14:11 ` Sergey Organov 2019-06-27 6:08 ` Uwe Kleine-König 2019-06-27 6:08 ` Uwe Kleine-König 2019-06-27 7:58 ` Sergey Organov 2019-07-04 13:00 ` [PATCH v3 0/7] serial: imx: fix RTS and RTS/CTS handling Sergey Organov 2019-07-04 13:00 ` [PATCH v3 1/7] serial: imx: fix locking in set_termios() Sergey Organov 2019-07-04 13:00 ` [PATCH v3 2/7] serial: imx: set_termios(): factor-out 'ucr2' initial value Sergey Organov 2019-07-04 13:00 ` [PATCH v3 3/7] serial: imx: set_termios(): clarify RTS/CTS bits calculation Sergey Organov 2019-07-04 13:00 ` Sergey Organov 2019-07-04 13:00 ` [PATCH v3 4/7] serial: imx: set_termios(): preserve RTS state Sergey Organov 2019-07-04 13:00 ` Sergey Organov 2019-07-04 13:00 ` [PATCH v3 5/7] serial: imx: set_termios(): do not enable autoRTS if RTS is unset Sergey Organov 2019-07-04 13:00 ` Sergey Organov 2019-07-04 13:00 ` [PATCH v3 6/7] serial: imx: set_mctrl(): correctly restore autoRTS state Sergey Organov 2019-07-04 13:00 ` Sergey Organov 2019-07-04 13:00 ` [PATCH v3 7/7] serial: imx: get rid of imx_uart_rts_auto() Sergey Organov 2019-07-04 13:00 ` Sergey Organov 2019-07-19 8:47 ` [PATCH v4 0/3] serial: imx: fix RTS and RTS/CTS handling Sergey Organov 2019-07-19 8:47 ` [PATCH v4 1/3] serial: imx: set_termios(): do not enable autoRTS if RTS is unset Sergey Organov 2019-07-19 8:47 ` Sergey Organov 2019-07-19 9:11 ` Uwe Kleine-König 2019-07-19 9:11 ` Uwe Kleine-König 2019-07-19 12:18 ` Sergey Organov 2019-07-19 14:31 ` Uwe Kleine-König 2019-07-19 14:31 ` Uwe Kleine-König 2019-07-19 15:13 ` Sergey Organov 2019-07-19 20:19 ` Uwe Kleine-König 2019-07-19 20:19 ` Uwe Kleine-König 2019-07-22 7:42 ` Sergey Organov 2019-07-22 7:51 ` Uwe Kleine-König 2019-07-22 7:51 ` Uwe Kleine-König 2019-07-22 9:20 ` Sergey Organov 2019-07-22 9:46 ` Uwe Kleine-König 2019-07-22 9:46 ` Uwe Kleine-König 2019-07-22 13:54 ` Sergey Organov 2019-07-22 16:47 ` Uwe Kleine-König 2019-07-22 16:47 ` Uwe Kleine-König 2019-07-22 9:57 ` Russell King - ARM Linux admin 2019-07-22 9:57 ` Russell King - ARM Linux admin 2019-07-22 10:04 ` Uwe Kleine-König 2019-07-22 10:04 ` Uwe Kleine-König 2019-07-22 10:17 ` Russell King - ARM Linux admin 2019-07-22 10:17 ` Russell King - ARM Linux admin 2019-07-19 8:47 ` [PATCH v4 2/3] serial: imx: set_mctrl(): correctly restore autoRTS state Sergey Organov 2019-07-19 8:47 ` Sergey Organov 2019-07-19 8:47 ` [PATCH v4 3/3] serial: imx: get rid of imx_uart_rts_auto() Sergey Organov 2019-07-19 8:47 ` Sergey Organov 2019-07-22 9:22 ` [PATCH v5 0/3] serial: imx: fix RTS and RTS/CTS handling Sergey Organov 2019-07-22 9:22 ` [PATCH v5 1/3] serial: imx: set_termios(): do not enable autoRTS if RTS is unset Sergey Organov 2019-07-22 9:54 ` Uwe Kleine-König 2019-07-22 9:54 ` Uwe Kleine-König 2019-07-22 13:57 ` Sergey Organov 2019-07-22 16:20 ` Uwe Kleine-König 2019-07-22 16:20 ` Uwe Kleine-König 2019-07-22 19:09 ` Sergey Organov 2019-07-22 9:22 ` [PATCH v5 2/3] serial: imx: set_mctrl(): correctly restore autoRTS state Sergey Organov 2019-07-22 9:22 ` [PATCH v5 3/3] serial: imx: get rid of imx_uart_rts_auto() Sergey Organov 2019-07-22 19:22 ` [PATCH v6 0/3] serial: imx: fix RTS and RTS/CTS handling Sergey Organov 2019-07-22 19:22 ` [PATCH v6 1/3] serial: imx: set_termios(): do not enable autoRTS if RTS is unset Sergey Organov 2019-07-22 19:22 ` [PATCH v6 2/3] serial: imx: set_mctrl(): correctly restore autoRTS state Sergey Organov 2019-07-22 20:24 ` Uwe Kleine-König 2019-07-22 20:24 ` Uwe Kleine-König 2019-07-23 9:20 ` Sergey Organov 2019-07-23 9:49 ` Uwe Kleine-König 2019-07-23 9:49 ` Uwe Kleine-König 2019-07-23 11:16 ` Sergey Organov 2019-07-23 11:30 ` Sergey Organov 2019-07-22 19:22 ` [PATCH v6 3/3] serial: imx: get rid of imx_uart_rts_auto() Sergey Organov 2019-07-26 18:52 ` [PATCH v7 0/3] serial: imx: fix RTS and RTS/CTS handling Sergey Organov 2019-07-26 18:52 ` [PATCH v7 1/3] serial: imx: set_termios(): do not enable autoRTS if RTS is unset Sergey Organov 2019-07-26 18:52 ` [PATCH v7 2/3] serial: imx: set_mctrl(): correctly restore autoRTS state Sergey Organov 2019-07-26 18:52 ` Sergey Organov 2019-07-26 18:52 ` [PATCH v7 3/3] serial: imx: get rid of imx_uart_rts_auto() Sergey Organov 2019-07-26 18:52 ` Sergey Organov 2019-07-26 19:29 ` Uwe Kleine-König 2019-07-26 19:29 ` Uwe Kleine-König 2019-07-29 9:03 ` Sergey Organov 2019-07-29 9:29 ` Uwe Kleine-König 2019-07-29 9:29 ` Uwe Kleine-König
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