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msm_serial: Send more than 1 character on the console w/ UARTDM

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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>
This commit is contained in:
Stephen Boyd 2013-08-20 23:48:06 -07:00 committed by Greg Kroah-Hartman
parent c3b5d3be7e
commit a3957e80eb
1 changed files with 45 additions and 14 deletions
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59
drivers/tty/serial/msm_serial.c
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@ -769,32 +769,63 @@ static inline struct uart_port *get_port_from_line(unsigned int line)
} }
#ifdef CONFIG_SERIAL_MSM_CONSOLE #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, static void msm_console_write(struct console *co, const char *s,
unsigned int count) unsigned int count)
{ {
int i;
struct uart_port *port; struct uart_port *port;
struct msm_port *msm_port; struct msm_port *msm_port;
int num_newlines = 0;
bool replaced = false;
BUG_ON(co->index < 0 || co->index >= UART_NR); BUG_ON(co->index < 0 || co->index >= UART_NR);
port = get_port_from_line(co->index); port = get_port_from_line(co->index);
msm_port = UART_TO_MSM(port); 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); 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); spin_unlock(&port->lock);
} }