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tty: serial: msm: Remove 115.2 Kbps maximum baud rate limitation

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UART controller is capable to perform transfers up to 4 Mbps.
Remove artificial 115.2 Kbps limitation.

Signed-off-by: Ivan T. Ivanov <ivan.ivanov@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ivan T. Ivanov 2015-09-30 15:27:03 +03:00 committed by Greg Kroah-Hartman
parent 9969394501
commit 850b37a71b
1 changed files with 17 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

20
drivers/tty/serial/msm_serial.c
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@ -882,6 +882,7 @@ msm_find_best_baud(struct uart_port *port, unsigned int baud)
{ 3, 0xdd, 8 },
{ 2, 0xee, 16 },
{ 1, 0xff, 31 },
{ 0, 0xff, 31 },
};
divisor = uart_get_divisor(port, baud);
@ -893,16 +894,29 @@ msm_find_best_baud(struct uart_port *port, unsigned int baud)
return entry; /* Default to smallest divider */
}
static int msm_set_baud_rate(struct uart_port *port, unsigned int baud)
static int msm_set_baud_rate(struct uart_port *port, unsigned int baud,
unsigned long *saved_flags)
{
unsigned int rxstale, watermark, mask;
struct msm_port *msm_port = UART_TO_MSM(port);
const struct msm_baud_map *entry;
unsigned long flags;
entry = msm_find_best_baud(port, baud);
msm_write(port, entry->code, UART_CSR);
if (baud > 460800)
port->uartclk = baud * 16;
flags = *saved_flags;
spin_unlock_irqrestore(&port->lock, flags);
clk_set_rate(msm_port->clk, port->uartclk);
spin_lock_irqsave(&port->lock, flags);
*saved_flags = flags;
/* RX stale watermark */
rxstale = entry->rxstale;
watermark = UART_IPR_STALE_LSB & rxstale;
@ -1026,8 +1040,8 @@ static void msm_set_termios(struct uart_port *port, struct ktermios *termios,
msm_stop_dma(port, dma);
/* calculate and set baud rate */
baud = uart_get_baud_rate(port, termios, old, 300, 115200);
baud = msm_set_baud_rate(port, baud);
baud = uart_get_baud_rate(port, termios, old, 300, 4000000);
baud = msm_set_baud_rate(port, baud, &flags);
if (tty_termios_baud_rate(termios))
tty_termios_encode_baud_rate(termios, baud, baud);