These changes are a raw update to a vanilla kernel 4.1.10, with the

recently announced rt patch patch-4.1.10-rt10.patch. No further changes
needed.

Change-Id: I9a0cf084498133b10771e744b6da4b29dff706ba
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>

5 files changed, 108 insertions, 42 deletions

diff --git a/kernel/drivers/tty/serial/8250/8250_pci.c b/kernel/drivers/tty/serial/8250/8250_pci.c
index 46bcebba5..9373cca12 100644
--- a/kernel/drivers/tty/serial/8250/8250_pci.c
+++ b/kernel/drivers/tty/serial/8250/8250_pci.c
@@ -2000,6 +2000,12 @@ pci_wch_ch38x_setup(struct serial_private *priv,
 
 #define PCI_DEVICE_ID_EXAR_XR17V8358	0x8358
 
+#define PCI_VENDOR_ID_PERICOM			0x12D8
+#define PCI_DEVICE_ID_PERICOM_PI7C9X7951	0x7951
+#define PCI_DEVICE_ID_PERICOM_PI7C9X7952	0x7952
+#define PCI_DEVICE_ID_PERICOM_PI7C9X7954	0x7954
+#define PCI_DEVICE_ID_PERICOM_PI7C9X7958	0x7958
+
 /* Unknown vendors/cards - this should not be in linux/pci_ids.h */
 #define PCI_SUBDEVICE_ID_UNKNOWN_0x1584	0x1584
 #define PCI_SUBDEVICE_ID_UNKNOWN_0x1588	0x1588
@@ -2314,27 +2320,12 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
 	 * Pericom
 	 */
 	{
-		.vendor		= 0x12d8,
-		.device		= 0x7952,
-		.subvendor	= PCI_ANY_ID,
-		.subdevice	= PCI_ANY_ID,
-		.setup		= pci_pericom_setup,
-	},
-	{
-		.vendor		= 0x12d8,
-		.device		= 0x7954,
-		.subvendor	= PCI_ANY_ID,
-		.subdevice	= PCI_ANY_ID,
-		.setup		= pci_pericom_setup,
-	},
-	{
-		.vendor		= 0x12d8,
-		.device		= 0x7958,
-		.subvendor	= PCI_ANY_ID,
-		.subdevice	= PCI_ANY_ID,
-		.setup		= pci_pericom_setup,
+		.vendor         = PCI_VENDOR_ID_PERICOM,
+		.device         = PCI_ANY_ID,
+		.subvendor      = PCI_ANY_ID,
+		.subdevice      = PCI_ANY_ID,
+		.setup          = pci_pericom_setup,
 	},
-
 	/*
 	 * PLX
 	 */
@@ -3031,6 +3022,10 @@ enum pci_board_num_t {
 	pbn_fintek_8,
 	pbn_fintek_12,
 	pbn_wch384_4,
+	pbn_pericom_PI7C9X7951,
+	pbn_pericom_PI7C9X7952,
+	pbn_pericom_PI7C9X7954,
+	pbn_pericom_PI7C9X7958,
 };
 
 /*
@@ -3848,7 +3843,6 @@ static struct pciserial_board pci_boards[] = {
 		.base_baud	= 115200,
 		.first_offset	= 0x40,
 	},
-
 	[pbn_wch384_4] = {
 		.flags		= FL_BASE0,
 		.num_ports	= 4,
@@ -3856,6 +3850,33 @@ static struct pciserial_board pci_boards[] = {
 		.uart_offset    = 8,
 		.first_offset   = 0xC0,
 	},
+	/*
+	 * Pericom PI7C9X795[1248] Uno/Dual/Quad/Octal UART
+	 */
+	[pbn_pericom_PI7C9X7951] = {
+		.flags          = FL_BASE0,
+		.num_ports      = 1,
+		.base_baud      = 921600,
+		.uart_offset	= 0x8,
+	},
+	[pbn_pericom_PI7C9X7952] = {
+		.flags          = FL_BASE0,
+		.num_ports      = 2,
+		.base_baud      = 921600,
+		.uart_offset	= 0x8,
+	},
+	[pbn_pericom_PI7C9X7954] = {
+		.flags          = FL_BASE0,
+		.num_ports      = 4,
+		.base_baud      = 921600,
+		.uart_offset	= 0x8,
+	},
+	[pbn_pericom_PI7C9X7958] = {
+		.flags          = FL_BASE0,
+		.num_ports      = 8,
+		.base_baud      = 921600,
+		.uart_offset	= 0x8,
+	},
 };
 
 static const struct pci_device_id blacklist[] = {
@@ -5117,6 +5138,25 @@ static struct pci_device_id serial_pci_tbl[] = {
 		0,
 		0, pbn_exar_XR17V8358 },
 	/*
+	 * Pericom PI7C9X795[1248] Uno/Dual/Quad/Octal UART
+	 */
+	{   PCI_VENDOR_ID_PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7951,
+		PCI_ANY_ID, PCI_ANY_ID,
+		0,
+		0, pbn_pericom_PI7C9X7951 },
+	{   PCI_VENDOR_ID_PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7952,
+		PCI_ANY_ID, PCI_ANY_ID,
+		0,
+		0, pbn_pericom_PI7C9X7952 },
+	{   PCI_VENDOR_ID_PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7954,
+		PCI_ANY_ID, PCI_ANY_ID,
+		0,
+		0, pbn_pericom_PI7C9X7954 },
+	{   PCI_VENDOR_ID_PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7958,
+		PCI_ANY_ID, PCI_ANY_ID,
+		0,
+		0, pbn_pericom_PI7C9X7958 },
+	/*
 	 * Topic TP560 Data/Fax/Voice 56k modem (reported by Evan Clarke)
 	 */
 	{	PCI_VENDOR_ID_TOPIC, PCI_DEVICE_ID_TOPIC_TP560,
diff --git a/kernel/drivers/tty/serial/8250/8250_pnp.c b/kernel/drivers/tty/serial/8250/8250_pnp.c
index 50a09cd76..658b392d1 100644
--- a/kernel/drivers/tty/serial/8250/8250_pnp.c
+++ b/kernel/drivers/tty/serial/8250/8250_pnp.c
@@ -41,6 +41,12 @@ static const struct pnp_device_id pnp_dev_table[] = {
 	{	"AEI1240",		0	},
 	/* Rockwell 56K ACF II Fax+Data+Voice Modem */
 	{	"AKY1021",		0 /*SPCI_FL_NO_SHIRQ*/	},
+	/*
+	 * ALi Fast Infrared Controller
+	 * Native driver (ali-ircc) is broken so at least
+	 * it can be used with irtty-sir.
+	 */
+	{	"ALI5123",		0	},
 	/* AZT3005 PnP SOUND DEVICE */
 	{	"AZT4001",		0	},
 	/* Best Data Products Inc. Smart One 336F PnP Modem */
@@ -364,6 +370,11 @@ static const struct pnp_device_id pnp_dev_table[] = {
 	/* Winbond CIR port, should not be probed. We should keep track
 	   of it to prevent the legacy serial driver from probing it */
 	{	"WEC1022",		CIR_PORT	},
+	/*
+	 * SMSC IrCC SIR/FIR port, should not be probed by serial driver
+	 * as well so its own driver can bind to it.
+	 */
+	{	"SMCF010",		CIR_PORT	},
 	{	"",			0	}
 };
 
diff --git a/kernel/drivers/tty/serial/men_z135_uart.c b/kernel/drivers/tty/serial/men_z135_uart.c
index 35c55505b..5a41b8fbb 100644
--- a/kernel/drivers/tty/serial/men_z135_uart.c
+++ b/kernel/drivers/tty/serial/men_z135_uart.c
@@ -392,7 +392,6 @@ static irqreturn_t men_z135_intr(int irq, void *data)
 	struct men_z135_port *uart = (struct men_z135_port *)data;
 	struct uart_port *port = &uart->port;
 	bool handled = false;
-	unsigned long flags;
 	int irq_id;
 
 	uart->stat_reg = ioread32(port->membase + MEN_Z135_STAT_REG);
@@ -401,7 +400,7 @@ static irqreturn_t men_z135_intr(int irq, void *data)
 	if (!irq_id)
 		goto out;
 
-	spin_lock_irqsave(&port->lock, flags);
+	spin_lock(&port->lock);
 	/* It's save to write to IIR[7:6] RXC[9:8] */
 	iowrite8(irq_id, port->membase + MEN_Z135_STAT_REG);
 
@@ -427,7 +426,7 @@ static irqreturn_t men_z135_intr(int irq, void *data)
 		handled = true;
 	}
 
-	spin_unlock_irqrestore(&port->lock, flags);
+	spin_unlock(&port->lock);
 out:
 	return IRQ_RETVAL(handled);
 }
@@ -717,7 +716,7 @@ static void men_z135_set_termios(struct uart_port *port,
 
 	baud = uart_get_baud_rate(port, termios, old, 0, uart_freq / 16);
 
-	spin_lock(&port->lock);
+	spin_lock_irq(&port->lock);
 	if (tty_termios_baud_rate(termios))
 		tty_termios_encode_baud_rate(termios, baud, baud);
 
@@ -725,7 +724,7 @@ static void men_z135_set_termios(struct uart_port *port,
 	iowrite32(bd_reg, port->membase + MEN_Z135_BAUD_REG);
 
 	uart_update_timeout(port, termios->c_cflag, baud);
-	spin_unlock(&port->lock);
+	spin_unlock_irq(&port->lock);
 }
 
 static const char *men_z135_type(struct uart_port *port)
diff --git a/kernel/drivers/tty/serial/samsung.c b/kernel/drivers/tty/serial/samsung.c
index a0ae942d9..1e0d9b8c4 100644
--- a/kernel/drivers/tty/serial/samsung.c
+++ b/kernel/drivers/tty/serial/samsung.c
@@ -295,15 +295,6 @@ static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
 	if (ourport->tx_mode != S3C24XX_TX_DMA)
 		enable_tx_dma(ourport);
 
-	while (xmit->tail & (dma_get_cache_alignment() - 1)) {
-		if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
-			return 0;
-		wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
-		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
-		port->icount.tx++;
-		count--;
-	}
-
 	dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
 	dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
 
@@ -342,7 +333,9 @@ static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
 		return;
 	}
 
-	if (!ourport->dma || !ourport->dma->tx_chan || count < port->fifosize)
+	if (!ourport->dma || !ourport->dma->tx_chan ||
+	    count < ourport->min_dma_size ||
+	    xmit->tail & (dma_get_cache_alignment() - 1))
 		s3c24xx_serial_start_tx_pio(ourport);
 	else
 		s3c24xx_serial_start_tx_dma(ourport, count);
@@ -736,15 +729,20 @@ static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
 	struct uart_port *port = &ourport->port;
 	struct circ_buf *xmit = &port->state->xmit;
 	unsigned long flags;
-	int count;
+	int count, dma_count = 0;
 
 	spin_lock_irqsave(&port->lock, flags);
 
 	count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
 
-	if (ourport->dma && ourport->dma->tx_chan && count >= port->fifosize) {
-		s3c24xx_serial_start_tx_dma(ourport, count);
-		goto out;
+	if (ourport->dma && ourport->dma->tx_chan &&
+	    count >= ourport->min_dma_size) {
+		int align = dma_get_cache_alignment() -
+			(xmit->tail & (dma_get_cache_alignment() - 1));
+		if (count-align >= ourport->min_dma_size) {
+			dma_count = count-align;
+			count = align;
+		}
 	}
 
 	if (port->x_char) {
@@ -765,14 +763,24 @@ static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
 
 	/* try and drain the buffer... */
 
-	count = port->fifosize;
-	while (!uart_circ_empty(xmit) && count-- > 0) {
+	if (count > port->fifosize) {
+		count = port->fifosize;
+		dma_count = 0;
+	}
+
+	while (!uart_circ_empty(xmit) && count > 0) {
 		if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
 			break;
 
 		wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 		port->icount.tx++;
+		count--;
+	}
+
+	if (!count && dma_count) {
+		s3c24xx_serial_start_tx_dma(ourport, dma_count);
+		goto out;
 	}
 
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
@@ -1838,6 +1846,13 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
 	else if (ourport->info->fifosize)
 		ourport->port.fifosize = ourport->info->fifosize;
 
+	/*
+	 * DMA transfers must be aligned at least to cache line size,
+	 * so find minimal transfer size suitable for DMA mode
+	 */
+	ourport->min_dma_size = max_t(int, ourport->port.fifosize,
+				    dma_get_cache_alignment());
+
 	probe_index++;
 
 	dbg("%s: initialising port %p...\n", __func__, ourport);
diff --git a/kernel/drivers/tty/serial/samsung.h b/kernel/drivers/tty/serial/samsung.h
index d275032aa..fc5deaa4f 100644
--- a/kernel/drivers/tty/serial/samsung.h
+++ b/kernel/drivers/tty/serial/samsung.h
@@ -82,6 +82,7 @@ struct s3c24xx_uart_port {
 	unsigned char			tx_claimed;
 	unsigned int			pm_level;
 	unsigned long			baudclk_rate;
+	unsigned int			min_dma_size;
 
 	unsigned int			rx_irq;
 	unsigned int			tx_irq;