[U-Boot] [PATCH] serial: pl01x: fix PL010 regression

[Linus Walleij]

commit aed2fbef5e9a0ab5a7cd01e742039a962f0b24ef
"dm: serial: Tidy up the pl01x driver"
caused a regression on (real hardware) PL010 by omitting
to update the line control register when switching baudrate.

Fix this by inlining the missing write to the baud control
register.

Also renaming the set_line_control() function to
pl011_set_line_control() since this function is clearly
PL011-specific, and it won't suffice to call that to
set up line control.

Tested on the Integrator/AP hardware.

Cc: Simon Glass <sjg at chromium.org>
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
---
 drivers/serial/serial_pl01x.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/serial/serial_pl01x.c b/drivers/serial/serial_pl01x.c
index 75eb6bd729e1..2124161734c0 100644
--- a/drivers/serial/serial_pl01x.c
+++ b/drivers/serial/serial_pl01x.c
@@ -95,7 +95,7 @@ static int pl01x_generic_serial_init(struct pl01x_regs *regs,
 	return 0;
 }
 
-static int set_line_control(struct pl01x_regs *regs)
+static int pl011_set_line_control(struct pl01x_regs *regs)
 {
 	unsigned int lcr;
 	/*
@@ -129,6 +129,9 @@ static int pl01x_generic_setbrg(struct pl01x_regs *regs, enum pl01x_type type,
 	case TYPE_PL010: {
 		unsigned int divisor;
 
+		/* disable everything */
+		writel(0, &regs->pl010_cr);
+
 		switch (baudrate) {
 		case 9600:
 			divisor = UART_PL010_BAUD_9600;
@@ -152,6 +155,12 @@ static int pl01x_generic_setbrg(struct pl01x_regs *regs, enum pl01x_type type,
 		writel((divisor & 0xf00) >> 8, &regs->pl010_lcrm);
 		writel(divisor & 0xff, &regs->pl010_lcrl);
 
+		/*
+		 * Set line control for the PL010 to be 8 bits, 1 stop bit,
+		 * no parity, fifo enabled
+		 */
+		writel(UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN,
+		       &regs->pl010_lcrh);
 		/* Finally, enable the UART */
 		writel(UART_PL010_CR_UARTEN, &regs->pl010_cr);
 		break;
@@ -178,7 +187,7 @@ static int pl01x_generic_setbrg(struct pl01x_regs *regs, enum pl01x_type type,
 		writel(divider, &regs->pl011_ibrd);
 		writel(fraction, &regs->pl011_fbrd);
 
-		set_line_control(regs);
+		pl011_set_line_control(regs);
 		/* Finally, enable the UART */
 		writel(UART_PL011_CR_UARTEN | UART_PL011_CR_TXE |
 		       UART_PL011_CR_RXE | UART_PL011_CR_RTS, &regs->pl011_cr);
-- 
1.9.3