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linux-stm32@st-md-mailman.stormreply.com, lukas@wunner.de, Lino Sanfilippo Subject: [PATCH 2 1/9] serial: core: move RS485 configuration tasks from drivers into core Date: Wed, 16 Feb 2022 01:17:55 +0100 Message-Id: <20220216001803.637-2-LinoSanfilippo@gmx.de> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220216001803.637-1-LinoSanfilippo@gmx.de> References: <20220216001803.637-1-LinoSanfilippo@gmx.de> MIME-Version: 1.0 Content-Transfer-Encoding: base64 X-Provags-ID: V03:K1:DwBoOp3Hdle0l17X4ijaaS7OBJw4SZaNDHP7xyTK6n4Ia+pqp61 m5aTrloSjRFLWCErb6bGxl+l45wdG2RZGKpDO8a92NbQobSbg5o8vrxWevw4wFdrF6rYRI6 1cMPsfUCYy9egVD77ZpRSaNixbyqrj8RjtewfB99e/arVo5MJqcq/SpvMi+njnaJDMsdS51 dQrqvKKE9JRUOK6s85f1Q== X-UI-Out-Filterresults: notjunk:1;V03:K0:bmNCB1gxVX4=:J/sglHkC1SJ4i/puh7f5KG dCF/XX0YugPYdaSgqSNypFVuDenNFU+oCu4TKRRwGWAIBLeamPuuMf+aucPSGfwqoqqYTncMJ 4Y2C0vtbYbQYCje6UG921VNMRlWV+ndKj761KYBaJT2X+78KWkMS1noc2RoIWcAN6v/pF1YyH +Fby8SiOTsGBG1mDDTN/ssLKhahM4HkYrinnTh2cg+R5jTurQNhDTfFm+gylQVR1/Mobs/K3M 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List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, alexandre.belloni@bootlin.com, mcoquelin.stm32@gmail.com, Lino Sanfilippo , richard.genoud@gmail.com, festevam@gmail.com, s.hauer@pengutronix.de, linux@armlinux.org.uk, alexandre.torgue@foss.st.com, ludovic.desroches@microchip.com, lukas@wunner.de, linux-imx@nxp.com, kernel@pengutronix.de, linux-serial@vger.kernel.org, shawnguo@kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Several drivers that support setting the RS485 configuration via userspace implement one or more of the following tasks: - in case of an invalid RTS configuration (both RTS after send and RTS on send set or both unset) fall back to enable RTS on send and disable RTS after send - nullify the padding field of the returned serial_rs485 struct - copy the configuration into the uart port struct - limit RTS delays to 100 ms Move these tasks into the serial core to make them generic and to provide a consistent behaviour among all drivers. Signed-off-by: Lino Sanfilippo --- drivers/tty/serial/serial_core.c | 18 ++++++++++++++++++ include/uapi/linux/serial.h | 3 +++ 2 files changed, 21 insertions(+) diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 846192a7b4bf..a4f7e847d414 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1282,8 +1282,26 @@ static int uart_set_rs485_config(struct uart_port *port, if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) return -EFAULT; + /* pick sane settings if the user hasn't */ + if (!(rs485.flags & SER_RS485_RTS_ON_SEND) == + !(rs485.flags & SER_RS485_RTS_AFTER_SEND)) { + rs485.flags |= SER_RS485_RTS_ON_SEND; + rs485.flags &= ~SER_RS485_RTS_AFTER_SEND; + } + + rs485.delay_rts_before_send = min_t(unsigned int, + rs485.delay_rts_before_send, + SER_RS485_MAX_RTS_DELAY); + rs485.delay_rts_after_send = min_t(unsigned int, + rs485.delay_rts_after_send, + SER_RS485_MAX_RTS_DELAY); + /* Return clean padding area to userspace */ + memset(rs485.padding, 0, sizeof(rs485.padding)); + spin_lock_irqsave(&port->lock, flags); ret = port->rs485_config(port, &rs485); + if (!ret) + port->rs485 = rs485; spin_unlock_irqrestore(&port->lock, flags); if (ret) return ret; diff --git a/include/uapi/linux/serial.h b/include/uapi/linux/serial.h index fa6b16e5fdd8..859045a53231 100644 --- a/include/uapi/linux/serial.h +++ b/include/uapi/linux/serial.h @@ -128,6 +128,9 @@ struct serial_rs485 { (if supported) */ __u32 delay_rts_before_send; /* Delay before send (milliseconds) */ __u32 delay_rts_after_send; /* Delay after send (milliseconds) */ +#define SER_RS485_MAX_RTS_DELAY 100 /* Max time with active + RTS before/after + data sent (msecs) */ __u32 padding[5]; /* Memory is cheap, new structs are a royal PITA .. */ }; base-commit: 802d00bd774b77fe132e9e83462b96fb9919411c -- 2.34.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel