TTY/Serial driver fixes for 6.4-rc5

Here are some small tty/serial driver fixes for 6.4-rc5 that have all
 been in linux-next this past week with no reported problems.  Included
 in here are:
   - 8250_tegra driver bugfix
   - fsl uart driver bugfixes
   - Kconfig fix for dependancy issue
   - dt-bindings fix for the 8250_omap driver
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'tty-6.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial driver fixes from Greg KH:
 "Here are some small tty/serial driver fixes for 6.4-rc5 that have all
  been in linux-next this past week with no reported problems. Included
  in here are:

   - 8250_tegra driver bugfix

   - fsl uart driver bugfixes

   - Kconfig fix for dependancy issue

   - dt-bindings fix for the 8250_omap driver"

* tag 'tty-6.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  dt-bindings: serial: 8250_omap: add rs485-rts-active-high
  serial: cpm_uart: Fix a COMPILE_TEST dependency
  soc: fsl: cpm1: Fix TSA and QMC dependencies in case of COMPILE_TEST
  tty: serial: fsl_lpuart: use UARTCTRL_TXINV to send break instead of UARTCTRL_SBK
  serial: 8250_tegra: Fix an error handling path in tegra_uart_probe()

Documentation/devicetree/bindings/serial/8250_omap.yaml

@@ -70,6 +70,7 @@ properties:
   dsr-gpios: true
   rng-gpios: true
   dcd-gpios: true
+  rs485-rts-active-high: true
   rts-gpio: true
   power-domains: true
   clock-frequency: true

drivers/soc/fsl/qe/Kconfig

@@ -36,7 +36,7 @@ config UCC
 config CPM_TSA
 	tristate "CPM TSA support"
 	depends on OF && HAS_IOMEM
-	depends on CPM1 || COMPILE_TEST
+	depends on CPM1 || (CPM && COMPILE_TEST)
 	help
 	  Freescale CPM Time Slot Assigner (TSA)
 	  controller.
@@ -47,7 +47,7 @@ config CPM_TSA
 config CPM_QMC
 	tristate "CPM QMC support"
 	depends on OF && HAS_IOMEM
-	depends on CPM1 || (FSL_SOC && COMPILE_TEST)
+	depends on CPM1 || (FSL_SOC && CPM && COMPILE_TEST)
 	depends on CPM_TSA
 	help
 	  Freescale CPM QUICC Multichannel Controller

drivers/tty/serial/8250/8250_tegra.c

@@ -113,13 +113,15 @@ static int tegra_uart_probe(struct platform_device *pdev)
 
 	ret = serial8250_register_8250_port(&port8250);
 	if (ret < 0)
-		goto err_clkdisable;
+		goto err_ctrl_assert;
 
 	platform_set_drvdata(pdev, uart);
 	uart->line = ret;
 
 	return 0;
 
+err_ctrl_assert:
+	reset_control_assert(uart->rst);
 err_clkdisable:
 	clk_disable_unprepare(uart->clk);
 

drivers/tty/serial/Kconfig

@@ -762,7 +762,7 @@ config SERIAL_PMACZILOG_CONSOLE
 
 config SERIAL_CPM
 	tristate "CPM SCC/SMC serial port support"
-	depends on CPM2 || CPM1 || (PPC32 && COMPILE_TEST)
+	depends on CPM2 || CPM1
 	select SERIAL_CORE
 	help
 	  This driver supports the SCC and SMC serial ports on Motorola 

drivers/tty/serial/cpm_uart/cpm_uart.h

@@ -19,8 +19,6 @@ struct gpio_desc;
 #include "cpm_uart_cpm2.h"
 #elif defined(CONFIG_CPM1)
 #include "cpm_uart_cpm1.h"
-#elif defined(CONFIG_COMPILE_TEST)
-#include "cpm_uart_cpm2.h"
 #endif
 
 #define SERIAL_CPM_MAJOR	204

drivers/tty/serial/fsl_lpuart.c

@@ -1495,34 +1495,36 @@ static void lpuart_break_ctl(struct uart_port *port, int break_state)
 
 static void lpuart32_break_ctl(struct uart_port *port, int break_state)
 {
-	unsigned long temp, modem;
+	unsigned long temp;
-	struct tty_struct *tty;
-	unsigned int cflag = 0;
 
-	tty = tty_port_tty_get(&port->state->port);
+	temp = lpuart32_read(port, UARTCTRL);
-	if (tty) {
-		cflag = tty->termios.c_cflag;
-		tty_kref_put(tty);
-	}
 
-	temp = lpuart32_read(port, UARTCTRL) & ~UARTCTRL_SBK;
-	modem = lpuart32_read(port, UARTMODIR);
-
-	if (break_state != 0) {
-		temp |= UARTCTRL_SBK;
 	/*
-		 * LPUART CTS has higher priority than SBK, need to disable CTS before
+	 * LPUART IP now has two known bugs, one is CTS has higher priority than the
-		 * asserting SBK to avoid any interference if flow control is enabled.
+	 * break signal, which causes the break signal sending through UARTCTRL_SBK
+	 * may impacted by the CTS input if the HW flow control is enabled. It
+	 * exists on all platforms we support in this driver.
+	 * Another bug is i.MX8QM LPUART may have an additional break character
+	 * being sent after SBK was cleared.
+	 * To avoid above two bugs, we use Transmit Data Inversion function to send
+	 * the break signal instead of UARTCTRL_SBK.
 	 */
-		if (cflag & CRTSCTS && modem & UARTMODIR_TXCTSE)
+	if (break_state != 0) {
-			lpuart32_write(port, modem & ~UARTMODIR_TXCTSE, UARTMODIR);
+		/*
-	} else {
+		 * Disable the transmitter to prevent any data from being sent out
-		/* Re-enable the CTS when break off. */
+		 * during break, then invert the TX line to send break.
-		if (cflag & CRTSCTS && !(modem & UARTMODIR_TXCTSE))
+		 */
-			lpuart32_write(port, modem | UARTMODIR_TXCTSE, UARTMODIR);
+		temp &= ~UARTCTRL_TE;
-	}
-
 		lpuart32_write(port, temp, UARTCTRL);
+		temp |= UARTCTRL_TXINV;
+		lpuart32_write(port, temp, UARTCTRL);
+	} else {
+		/* Disable the TXINV to turn off break and re-enable transmitter. */
+		temp &= ~UARTCTRL_TXINV;
+		lpuart32_write(port, temp, UARTCTRL);
+		temp |= UARTCTRL_TE;
+		lpuart32_write(port, temp, UARTCTRL);
+	}
 }
 
 static void lpuart_setup_watermark(struct lpuart_port *sport)