diff options
| author | Ivan T. Ivanov <ivan.ivanov@linaro.org> | 2015-09-30 14:27:03 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-04 20:15:17 +0200 |
| commit | 850b37a71bde71ac43468bc05d031d5e0704dac3 (patch) | |
| tree | 5217b5906b73ed951adf19f9cd9d248feb05d1af /drivers/tty | |
| parent | tty: serial: msm: Add RX DMA support (diff) | |
| download | linux-850b37a71bde71ac43468bc05d031d5e0704dac3.tar.xz linux-850b37a71bde71ac43468bc05d031d5e0704dac3.zip | |
tty: serial: msm: Remove 115.2 Kbps maximum baud rate limitation
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>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/msm_serial.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c index 3efb80f511db..dcde955475dc 100644 --- a/drivers/tty/serial/msm_serial.c +++ b/drivers/tty/serial/msm_serial.c @@ -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); |