Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6: (49 commits)
  serial8250: ratelimit "too much work" error
  serial: bfin_sport_uart: speed up sport RX sample rate to be 3% faster
  serial: abstraction for 8250 legacy ports
  serial/imx: check that the buffer is non-empty before sending it out
  serial: mfd: add more baud rates support
  jsm: Remove the uart port on errors
  Alchemy: Add UART PM methods.
  8250: allow platforms to override PM hook.
  altera_uart: Don't use plain integer as NULL pointer
  altera_uart: Fix missing prototype for registering an early console
  altera_uart: Fixup type usage of port flags
  altera_uart: Make it possible to use Altera UART and 8250 ports together
  altera_uart: Add support for different address strides
  altera_uart: Add support for getting mapbase and IRQ from resources
  altera_uart: Add support for polling mode (IRQ-less)
  serial: Factor out uart_poll_timeout() from 8250 driver
  serial: mark the 8250 driver as maintained
  serial: 8250: Don't delay after transmitter is ready.
  tty: MAINTAINERS: add drivers/serial/jsm/ as maintained driver
  vcs: invoke the vt update callback when /dev/vcs* is written to
  ...

1 files changed, 33 insertions, 14 deletions

diff --git a/drivers/serial/mfd.c b/drivers/serial/mfd.c
index dc0967fb9ea6..5fc699e929dc 100644
--- a/drivers/serial/mfd.c
+++ b/drivers/serial/mfd.c
@@ -172,6 +172,9 @@ static ssize_t port_show_regs(struct file *file, char __user *user_buf,
 	len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
 			"DIV: \t\t0x%08x\n", serial_in(up, UART_DIV));
 
+	if (len > HSU_REGS_BUFSIZE)
+		len = HSU_REGS_BUFSIZE;
+
 	ret =  simple_read_from_buffer(user_buf, count, ppos, buf, len);
 	kfree(buf);
 	return ret;
@@ -219,6 +222,9 @@ static ssize_t dma_show_regs(struct file *file, char __user *user_buf,
 	len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
 			"D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D3TSR));
 
+	if (len > HSU_REGS_BUFSIZE)
+		len = HSU_REGS_BUFSIZE;
+
 	ret =  simple_read_from_buffer(user_buf, count, ppos, buf, len);
 	kfree(buf);
 	return ret;
@@ -925,39 +931,52 @@ serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios,
 		cval |= UART_LCR_EPAR;
 
 	/*
+	 * The base clk is 50Mhz, and the baud rate come from:
+	 *	baud = 50M * MUL / (DIV * PS * DLAB)
+	 *
 	 * For those basic low baud rate we can get the direct
-	 * scalar from 2746800, like 115200 = 2746800/24, for those
-	 * higher baud rate, we have to handle them case by case,
-	 * but DIV reg is never touched as its default value 0x3d09
+	 * scalar from 2746800, like 115200 = 2746800/24. For those
+	 * higher baud rate, we handle them case by case, mainly by
+	 * adjusting the MUL/PS registers, and DIV register is kept
+	 * as default value 0x3d09 to make things simple
 	 */
 	baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
-	quot = uart_get_divisor(port, baud);
 
+	quot = 1;
 	switch (baud) {
 	case 3500000:
 		mul = 0x3345;
 		ps = 0xC;
-		quot = 1;
+		break;
+	case 3000000:
+		mul = 0x2EE0;
 		break;
 	case 2500000:
 		mul = 0x2710;
-		ps = 0x10;
-		quot = 1;
 		break;
-	case 18432000:
+	case 2000000:
+		mul = 0x1F40;
+		break;
+	case 1843200:
 		mul = 0x2400;
-		ps = 0x10;
-		quot = 1;
 		break;
 	case 1500000:
-		mul = 0x1D4C;
-		ps = 0xc;
-		quot = 1;
+		mul = 0x1770;
+		break;
+	case 1000000:
+		mul = 0xFA0;
+		break;
+	case 500000:
+		mul = 0x7D0;
 		break;
 	default:
-		;
+		/* Use uart_get_divisor to get quot for other baud rates */
+		quot = 0;
 	}
 
+	if (!quot)
+		quot = uart_get_divisor(port, baud);
+
 	if ((up->port.uartclk / quot) < (2400 * 16))
 		fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_1B;
 	else if ((up->port.uartclk / quot) < (230400 * 16))