From 6f7ec77cc8b64ff5037c1945e4650c65c458037d Mon Sep 17 00:00:00 2001 From: Stefan Agner Date: Fri, 28 May 2021 22:39:31 +0200 Subject: USB: serial: cp210x: fix alternate function for CP2102N QFN20 The QFN20 part has a different GPIO/port function assignment. The configuration struct bit field ordered as TX/RX/RS485/WAKEUP/CLK which exactly matches GPIO0-3 for QFN24/28. However, QFN20 has a different GPIO to primary function assignment. Special case QFN20 to follow to properly detect which GPIOs are available. Signed-off-by: Stefan Agner Link: https://lore.kernel.org/r/51830b2b24118eb0f77c5c9ac64ffb2f519dbb1d.1622218300.git.stefan@agner.ch Fixes: c8acfe0aadbe ("USB: serial: cp210x: implement GPIO support for CP2102N") Cc: stable@vger.kernel.org # 4.19 Signed-off-by: Johan Hovold --- drivers/usb/serial/cp210x.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c index ee595d1bea0a..c9f8ebd34122 100644 --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -537,6 +537,12 @@ struct cp210x_single_port_config { #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 +/* CP2102N QFN20 port configuration values */ +#define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2) +#define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3) +#define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4) +#define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6) + /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ struct cp210x_gpio_write { u8 mask; @@ -1733,7 +1739,19 @@ static int cp2102n_gpioconf_init(struct usb_serial *serial) priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; /* 0 indicates GPIO mode, 1 is alternate function */ - priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; + if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) { + /* QFN20 is special... */ + if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */ + priv->gpio_altfunc |= BIT(0); + if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */ + priv->gpio_altfunc |= BIT(1); + if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */ + priv->gpio_altfunc |= BIT(2); + if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */ + priv->gpio_altfunc |= BIT(3); + } else { + priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; + } if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { /* -- cgit v1.2.3 From 63a8eef70ccb5199534dec56fed9759d214bfe55 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Wed, 9 Jun 2021 18:15:09 +0200 Subject: USB: serial: cp210x: fix CP2102N-A01 modem control MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit CP2102N revision A01 (firmware version <= 1.0.4) has a buggy flow-control implementation that uses the ulXonLimit instead of ulFlowReplace field of the flow-control settings structure (erratum CP2102N_E104). A recent change that set the input software flow-control limits incidentally broke RTS control for these devices when CRTSCTS is not set as the new limits would always enable hardware flow control. Fix this by explicitly disabling flow control for the buggy firmware versions and only updating the input software flow-control limits when IXOFF is requested. This makes sure that the terminal settings matches the default zero ulXonLimit (ulFlowReplace) for these devices. Link: https://lore.kernel.org/r/20210609161509.9459-1-johan@kernel.org Reported-by: David Frey Reported-by: Alex Villacís Lasso Tested-by: Alex Villacís Lasso Fixes: f61309d9c96a ("USB: serial: cp210x: set IXOFF thresholds") Cc: stable@vger.kernel.org # 5.12 Signed-off-by: Johan Hovold --- drivers/usb/serial/cp210x.c | 64 +++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 59 insertions(+), 5 deletions(-) (limited to 'drivers') diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c index c9f8ebd34122..fcb812bc832c 100644 --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -252,9 +252,11 @@ struct cp210x_serial_private { u8 gpio_input; #endif u8 partnum; + u32 fw_version; speed_t min_speed; speed_t max_speed; bool use_actual_rate; + bool no_flow_control; }; enum cp210x_event_state { @@ -398,6 +400,7 @@ struct cp210x_special_chars { /* CP210X_VENDOR_SPECIFIC values */ #define CP210X_READ_2NCONFIG 0x000E +#define CP210X_GET_FW_VER_2N 0x0010 #define CP210X_READ_LATCH 0x00C2 #define CP210X_GET_PARTNUM 0x370B #define CP210X_GET_PORTCONFIG 0x370C @@ -1128,6 +1131,7 @@ static bool cp210x_termios_change(const struct ktermios *a, const struct ktermio static void cp210x_set_flow_control(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios) { + struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); struct cp210x_special_chars chars; struct cp210x_flow_ctl flow_ctl; @@ -1135,6 +1139,15 @@ static void cp210x_set_flow_control(struct tty_struct *tty, u32 ctl_hs; int ret; + /* + * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum + * CP2102N_E104). Report back that flow control is not supported. + */ + if (priv->no_flow_control) { + tty->termios.c_cflag &= ~CRTSCTS; + tty->termios.c_iflag &= ~(IXON | IXOFF); + } + if (old_termios && C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && I_IXON(tty) == (old_termios->c_iflag & IXON) && @@ -1191,19 +1204,20 @@ static void cp210x_set_flow_control(struct tty_struct *tty, port_priv->crtscts = false; } - if (I_IXOFF(tty)) + if (I_IXOFF(tty)) { flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; - else + + flow_ctl.ulXonLimit = cpu_to_le32(128); + flow_ctl.ulXoffLimit = cpu_to_le32(128); + } else { flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; + } if (I_IXON(tty)) flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; else flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; - flow_ctl.ulXonLimit = cpu_to_le32(128); - flow_ctl.ulXoffLimit = cpu_to_le32(128); - dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__, ctl_hs, flow_repl); @@ -1926,6 +1940,45 @@ static void cp210x_init_max_speed(struct usb_serial *serial) priv->use_actual_rate = use_actual_rate; } +static int cp210x_get_fw_version(struct usb_serial *serial, u16 value) +{ + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + u8 ver[3]; + int ret; + + ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value, + ver, sizeof(ver)); + if (ret) + return ret; + + dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__, + ver[0], ver[1], ver[2]); + + priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2]; + + return 0; +} + +static void cp210x_determine_quirks(struct usb_serial *serial) +{ + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + int ret; + + switch (priv->partnum) { + case CP210X_PARTNUM_CP2102N_QFN28: + case CP210X_PARTNUM_CP2102N_QFN24: + case CP210X_PARTNUM_CP2102N_QFN20: + ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N); + if (ret) + break; + if (priv->fw_version <= 0x10004) + priv->no_flow_control = true; + break; + default: + break; + } +} + static int cp210x_attach(struct usb_serial *serial) { int result; @@ -1946,6 +1999,7 @@ static int cp210x_attach(struct usb_serial *serial) usb_set_serial_data(serial, priv); + cp210x_determine_quirks(serial); cp210x_init_max_speed(serial); result = cp210x_gpio_init(serial); -- cgit v1.2.3