diff options
author | Stephen Boyd <sboyd@codeaurora.org> | 2013-08-20 23:48:06 -0700 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-27 16:22:59 -0700 |
commit | a3957e80eb56059698676694ee500cfbe5b8972b (patch) | |
tree | 08d91e5159e700fd5b5a77f0ba20a1bc71866fac /drivers/tty/serial | |
parent | c3b5d3be7e354d4e05ae433b9c733330c65b8b34 (diff) | |
download | op-kernel-dev-a3957e80eb56059698676694ee500cfbe5b8972b.zip op-kernel-dev-a3957e80eb56059698676694ee500cfbe5b8972b.tar.gz |
msm_serial: Send more than 1 character on the console w/ UARTDM
We recently added support to send more than one character at a
time for UARTDM hardware but we didn't add the same support in
the console code path. Add support here to speed up console
messages on UARTDM hardware.
Cc: David Brown <davidb@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial')
-rw-r--r-- | drivers/tty/serial/msm_serial.c | 59 |
1 files changed, 45 insertions, 14 deletions
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c index 5a75039..b5d779c 100644 --- a/drivers/tty/serial/msm_serial.c +++ b/drivers/tty/serial/msm_serial.c @@ -769,32 +769,63 @@ static inline struct uart_port *get_port_from_line(unsigned int line) } #ifdef CONFIG_SERIAL_MSM_CONSOLE - -static void msm_console_putchar(struct uart_port *port, int c) -{ - struct msm_port *msm_port = UART_TO_MSM(port); - - if (msm_port->is_uartdm) - reset_dm_count(port, 1); - - while (!(msm_read(port, UART_SR) & UART_SR_TX_READY)) - ; - msm_write(port, c, msm_port->is_uartdm ? UARTDM_TF : UART_TF); -} - static void msm_console_write(struct console *co, const char *s, unsigned int count) { + int i; struct uart_port *port; struct msm_port *msm_port; + int num_newlines = 0; + bool replaced = false; BUG_ON(co->index < 0 || co->index >= UART_NR); port = get_port_from_line(co->index); msm_port = UART_TO_MSM(port); + /* Account for newlines that will get a carriage return added */ + for (i = 0; i < count; i++) + if (s[i] == '\n') + num_newlines++; + count += num_newlines; + spin_lock(&port->lock); - uart_console_write(port, s, count, msm_console_putchar); + if (msm_port->is_uartdm) + reset_dm_count(port, count); + + i = 0; + while (i < count) { + int j; + unsigned int num_chars; + char buf[4] = { 0 }; + unsigned int *bf = (unsigned int *)&buf; + + if (msm_port->is_uartdm) + num_chars = min(count - i, (unsigned int)sizeof(buf)); + else + num_chars = 1; + + for (j = 0; j < num_chars; j++) { + char c = *s; + + if (c == '\n' && !replaced) { + buf[j] = '\r'; + j++; + replaced = true; + } + if (j < num_chars) { + buf[j] = c; + s++; + replaced = false; + } + } + + while (!(msm_read(port, UART_SR) & UART_SR_TX_READY)) + cpu_relax(); + + msm_write(port, *bf, msm_port->is_uartdm ? UARTDM_TF : UART_TF); + i += num_chars; + } spin_unlock(&port->lock); } |