Merge tag 'tty-5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty / serial updates from Greg KH:
 "Here is the "big" set of tty/serial driver patches for 5.15-rc1

  Nothing major in here at all, just some driver updates and more
  cleanups on old tty apis and code that needed it that includes:

   - tty.h cleanup of things that didn't belong in it

   - other tty cleanups by Jiri

   - driver cleanups

   - rs485 support added to amba-pl011 driver

   - dts updates

   - stm32 serial driver updates

   - other minor fixes and driver updates

  All have been in linux-next for a while with no reported problems"

* tag 'tty-5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (83 commits)
  tty: serial: uartlite: Use read_poll_timeout for a polling loop
  tty: serial: uartlite: Use constants in early_uartlite_putc
  tty: Fix data race between tiocsti() and flush_to_ldisc()
  serial: vt8500: Use of_device_get_match_data
  serial: tegra: Use of_device_get_match_data
  serial: 8250_ingenic: Use of_device_get_match_data
  tty: serial: linflexuart: Remove redundant check to simplify the code
  tty: serial: fsl_lpuart: do software reset for imx7ulp and imx8qxp
  tty: serial: fsl_lpuart: enable two stop bits for lpuart32
  tty: serial: fsl_lpuart: fix the wrong mapbase value
  mxser: use semi-colons instead of commas
  tty: moxa: use semi-colons instead of commas
  tty: serial: fsl_lpuart: check dma_tx_in_progress in tx dma callback
  tty: replace in_irq() with in_hardirq()
  serial: sh-sci: fix break handling for sysrq
  serial: stm32: use devm_platform_get_and_ioremap_resource()
  serial: stm32: use the defined variable to simplify code
  Revert "arm pl011 serial: support multi-irq request"
  tty: serial: samsung: Add Exynos850 SoC data
  tty: serial: samsung: Fix driver data macros style
  ...

9 files changed, 72 insertions, 26 deletions

diff --git a/drivers/tty/serial/8250/8250_bcm7271.c b/drivers/tty/serial/8250/8250_bcm7271.c
index 725a450058f8..7f656fac503f 100644
--- a/drivers/tty/serial/8250/8250_bcm7271.c
+++ b/drivers/tty/serial/8250/8250_bcm7271.c
@@ -941,7 +941,7 @@ static int brcmuart_probe(struct platform_device *pdev)
 	struct clk *baud_mux_clk;
 	struct uart_8250_port up;
 	struct resource *irq;
-	void __iomem *membase = 0;
+	void __iomem *membase = NULL;
 	resource_size_t mapbase = 0;
 	u32 clk_rate = 0;
 	int ret;
diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
index 3ffeedc29c83..d502240bbcf2 100644
--- a/drivers/tty/serial/8250/8250_exar.c
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -114,6 +114,7 @@ struct exar8250;
 struct exar8250_platform {
 	int (*rs485_config)(struct uart_port *, struct serial_rs485 *);
 	int (*register_gpio)(struct pci_dev *, struct uart_8250_port *);
+	void (*unregister_gpio)(struct uart_8250_port *);
 };
 
 /**
@@ -352,9 +353,8 @@ static void setup_gpio(struct pci_dev *pcidev, u8 __iomem *p)
 	writeb(0x00, p + UART_EXAR_MPIOOD_15_8);
 }
 
-static void *
-__xr17v35x_register_gpio(struct pci_dev *pcidev,
-			 const struct software_node *node)
+static struct platform_device *__xr17v35x_register_gpio(struct pci_dev *pcidev,
+							const struct software_node *node)
 {
 	struct platform_device *pdev;
 
@@ -374,6 +374,12 @@ __xr17v35x_register_gpio(struct pci_dev *pcidev,
 	return pdev;
 }
 
+static void __xr17v35x_unregister_gpio(struct platform_device *pdev)
+{
+	device_remove_software_node(&pdev->dev);
+	platform_device_unregister(pdev);
+}
+
 static const struct property_entry exar_gpio_properties[] = {
 	PROPERTY_ENTRY_U32("exar,first-pin", 0),
 	PROPERTY_ENTRY_U32("ngpios", 16),
@@ -384,8 +390,7 @@ static const struct software_node exar_gpio_node = {
 	.properties = exar_gpio_properties,
 };
 
-static int xr17v35x_register_gpio(struct pci_dev *pcidev,
-				  struct uart_8250_port *port)
+static int xr17v35x_register_gpio(struct pci_dev *pcidev, struct uart_8250_port *port)
 {
 	if (pcidev->vendor == PCI_VENDOR_ID_EXAR)
 		port->port.private_data =
@@ -394,6 +399,15 @@ static int xr17v35x_register_gpio(struct pci_dev *pcidev,
 	return 0;
 }
 
+static void xr17v35x_unregister_gpio(struct uart_8250_port *port)
+{
+	if (!port->port.private_data)
+		return;
+
+	__xr17v35x_unregister_gpio(port->port.private_data);
+	port->port.private_data = NULL;
+}
+
 static int generic_rs485_config(struct uart_port *port,
 				struct serial_rs485 *rs485)
 {
@@ -419,6 +433,7 @@ static int generic_rs485_config(struct uart_port *port,
 
 static const struct exar8250_platform exar8250_default_platform = {
 	.register_gpio = xr17v35x_register_gpio,
+	.unregister_gpio = xr17v35x_unregister_gpio,
 	.rs485_config = generic_rs485_config,
 };
 
@@ -484,6 +499,7 @@ static int iot2040_register_gpio(struct pci_dev *pcidev,
 static const struct exar8250_platform iot2040_platform = {
 	.rs485_config = iot2040_rs485_config,
 	.register_gpio = iot2040_register_gpio,
+	.unregister_gpio = xr17v35x_unregister_gpio,
 };
 
 /*
@@ -555,17 +571,11 @@ pci_xr17v35x_setup(struct exar8250 *priv, struct pci_dev *pcidev,
 
 static void pci_xr17v35x_exit(struct pci_dev *pcidev)
 {
+	const struct exar8250_platform *platform = exar_get_platform();
 	struct exar8250 *priv = pci_get_drvdata(pcidev);
 	struct uart_8250_port *port = serial8250_get_port(priv->line[0]);
-	struct platform_device *pdev;
 
-	pdev = port->port.private_data;
-	if (!pdev)
-		return;
-
-	device_remove_software_node(&pdev->dev);
-	platform_device_unregister(pdev);
-	port->port.private_data = NULL;
+	platform->unregister_gpio(port);
 }
 
 static inline void exar_misc_clear(struct exar8250 *priv)
diff --git a/drivers/tty/serial/8250/8250_ingenic.c b/drivers/tty/serial/8250/8250_ingenic.c
index 988bf6bcce42..65402d05eff9 100644
--- a/drivers/tty/serial/8250/8250_ingenic.c
+++ b/drivers/tty/serial/8250/8250_ingenic.c
@@ -209,16 +209,14 @@ static int ingenic_uart_probe(struct platform_device *pdev)
 	struct uart_8250_port uart = {};
 	struct ingenic_uart_data *data;
 	const struct ingenic_uart_config *cdata;
-	const struct of_device_id *match;
 	struct resource *regs;
 	int irq, err, line;
 
-	match = of_match_device(of_match, &pdev->dev);
-	if (!match) {
+	cdata = of_device_get_match_data(&pdev->dev);
+	if (!cdata) {
 		dev_err(&pdev->dev, "Error: No device match found\n");
 		return -ENODEV;
 	}
-	cdata = match->data;
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/8250_lpss.c
index 4dee8a9e0c95..848d81e3838c 100644
--- a/drivers/tty/serial/8250/8250_lpss.c
+++ b/drivers/tty/serial/8250/8250_lpss.c
@@ -158,6 +158,16 @@ static int byt_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
 
 static int ehl_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
 {
+	struct uart_8250_dma *dma = &lpss->data.dma;
+	struct uart_8250_port *up = up_to_u8250p(port);
+
+	/*
+	 * This simply makes the checks in the 8250_port to try the DMA
+	 * channel request which in turn uses the magic of ACPI tables
+	 * parsing (see drivers/dma/acpi-dma.c for the details) and
+	 * matching with the registered General Purpose DMA controllers.
+	 */
+	up->dma = dma;
 	return 0;
 }
 
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 79418d4beb48..891fd8345e25 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -538,7 +538,7 @@ static void omap_8250_pm(struct uart_port *port, unsigned int state,
 static void omap_serial_fill_features_erratas(struct uart_8250_port *up,
 					      struct omap8250_priv *priv)
 {
-	const struct soc_device_attribute k3_soc_devices[] = {
+	static const struct soc_device_attribute k3_soc_devices[] = {
 		{ .family = "AM65X",  },
 		{ .family = "J721E", .revision = "SR1.0" },
 		{ /* sentinel */ }
@@ -617,7 +617,7 @@ static irqreturn_t omap8250_irq(int irq, void *dev_id)
 	struct uart_port *port = dev_id;
 	struct omap8250_priv *priv = port->private_data;
 	struct uart_8250_port *up = up_to_u8250p(port);
-	unsigned int iir;
+	unsigned int iir, lsr;
 	int ret;
 
 #ifdef CONFIG_SERIAL_8250_DMA
@@ -628,6 +628,7 @@ static irqreturn_t omap8250_irq(int irq, void *dev_id)
 #endif
 
 	serial8250_rpm_get(up);
+	lsr = serial_port_in(port, UART_LSR);
 	iir = serial_port_in(port, UART_IIR);
 	ret = serial8250_handle_irq(port, iir);
 
@@ -642,6 +643,24 @@ static irqreturn_t omap8250_irq(int irq, void *dev_id)
 		serial_port_in(port, UART_RX);
 	}
 
+	/* Stop processing interrupts on input overrun */
+	if ((lsr & UART_LSR_OE) && up->overrun_backoff_time_ms > 0) {
+		unsigned long delay;
+
+		up->ier = port->serial_in(port, UART_IER);
+		if (up->ier & (UART_IER_RLSI | UART_IER_RDI)) {
+			port->ops->stop_rx(port);
+		} else {
+			/* Keep restarting the timer until
+			 * the input overrun subsides.
+			 */
+			cancel_delayed_work(&up->overrun_backoff);
+		}
+
+		delay = msecs_to_jiffies(up->overrun_backoff_time_ms);
+		schedule_delayed_work(&up->overrun_backoff, delay);
+	}
+
 	serial8250_rpm_put(up);
 
 	return IRQ_RETVAL(ret);
@@ -1353,6 +1372,10 @@ static int omap8250_probe(struct platform_device *pdev)
 		}
 	}
 
+	if (of_property_read_u32(np, "overrun-throttle-ms",
+				 &up.overrun_backoff_time_ms) != 0)
+		up.overrun_backoff_time_ms = 0;
+
 	priv->wakeirq = irq_of_parse_and_map(np, 1);
 
 	pdata = of_device_get_match_data(&pdev->dev);
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index a808c283883e..726912b16a55 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -87,7 +87,7 @@ static void moan_device(const char *str, struct pci_dev *dev)
 
 static int
 setup_port(struct serial_private *priv, struct uart_8250_port *port,
-	   int bar, int offset, int regshift)
+	   u8 bar, unsigned int offset, int regshift)
 {
 	struct pci_dev *dev = priv->dev;
 
diff --git a/drivers/tty/serial/8250/8250_pnp.c b/drivers/tty/serial/8250/8250_pnp.c
index de90d681b64c..98e5ee4d0d08 100644
--- a/drivers/tty/serial/8250/8250_pnp.c
+++ b/drivers/tty/serial/8250/8250_pnp.c
@@ -13,6 +13,7 @@
 #include <linux/pnp.h>
 #include <linux/string.h>
 #include <linux/kernel.h>
+#include <linux/property.h>
 #include <linux/serial_core.h>
 #include <linux/bitops.h>
 
@@ -475,6 +476,7 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
 	if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)
 		uart.port.flags |= UPF_SHARE_IRQ;
 	uart.port.uartclk = 1843200;
+	device_property_read_u32(&dev->dev, "clock-frequency", &uart.port.uartclk);
 	uart.port.dev = &dev->dev;
 
 	line = serial8250_register_8250_port(&uart);
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 1da29a219842..66374704747e 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -122,7 +122,8 @@ static const struct serial8250_config uart_config[] = {
 		.name		= "16C950/954",
 		.fifo_size	= 128,
 		.tx_loadsz	= 128,
-		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01,
+		.rxtrig_bytes	= {16, 32, 112, 120},
 		/* UART_CAP_EFR breaks billionon CF bluetooth card. */
 		.flags		= UART_CAP_FIFO | UART_CAP_SLEEP,
 	},
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index d1b3c2373fa4..71ae16de0f90 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -363,7 +363,7 @@ config SERIAL_8250_BCM2835AUX
 config SERIAL_8250_FSL
 	bool
 	depends on SERIAL_8250_CONSOLE
-	default PPC || ARM || ARM64
+	default PPC || ARM || ARM64 || COMPILE_TEST
 
 config SERIAL_8250_DW
 	tristate "Support for Synopsys DesignWare 8250 quirks"
@@ -375,7 +375,8 @@ config SERIAL_8250_DW
 
 config SERIAL_8250_EM
 	tristate "Support for Emma Mobile integrated serial port"
-	depends on SERIAL_8250 && ARM && HAVE_CLK
+	depends on SERIAL_8250 && HAVE_CLK
+	depends on ARM || COMPILE_TEST
 	help
 	  Selecting this option will add support for the integrated serial
 	  port hardware found on the Emma Mobile line of processors.
@@ -383,7 +384,8 @@ config SERIAL_8250_EM
 
 config SERIAL_8250_IOC3
 	tristate "SGI IOC3 8250 UART support"
-	depends on SGI_MFD_IOC3 && SERIAL_8250
+	depends on SERIAL_8250
+	depends on SGI_MFD_IOC3 || COMPILE_TEST
 	select SERIAL_8250_EXTENDED
 	select SERIAL_8250_SHARE_IRQ
 	help
@@ -495,7 +497,7 @@ config SERIAL_8250_MID
 config SERIAL_8250_PXA
 	tristate "PXA serial port support"
 	depends on SERIAL_8250
-	depends on ARCH_PXA || ARCH_MMP
+	depends on ARCH_PXA || ARCH_MMP || COMPILE_TEST
 	help
 	  If you have a machine based on an Intel XScale PXA2xx CPU you can
 	  enable its onboard serial ports by enabling this option. The option is