On Wed, 11 Jan 2023 at 00:55, Pali Rohár pali@kernel.org wrote:
On Tuesday 10 January 2023 20:24:07 Loic Poulain wrote:
Instead of waiting for empty FIFO condition before writing a character, wait for non-full FIFO condition.
This helps in saving several tens of milliseconds during boot (depending verbosity).
Signed-off-by: Loic Poulain loic.poulain@linaro.org Tested-by: Lothar Waßmann LW@KARO-electronics.de
v2: fixing transfert abort & char corruption commit v3: Reordering commits for good bisectability
drivers/serial/serial_mxc.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/serial/serial_mxc.c b/drivers/serial/serial_mxc.c index 3c89781f2c..9899155c00 100644 --- a/drivers/serial/serial_mxc.c +++ b/drivers/serial/serial_mxc.c @@ -238,11 +238,11 @@ static void mxc_serial_putc(const char c) if (c == '\n') serial_putc('\r');
writel(c, &mxc_base->txd);/* wait for transmitter to be ready */while (!(readl(&mxc_base->ts) & UTS_TXEMPTY))
while (readl(&mxc_base->ts) & UTS_TXFULL) schedule();writel(c, &mxc_base->txd);}
/* Test whether a character is in the RX buffer */ @@ -333,7 +333,7 @@ static int mxc_serial_putc(struct udevice *dev, const char ch) struct mxc_serial_plat *plat = dev_get_plat(dev); struct mxc_uart *const uart = plat->reg;
if (!(readl(&uart->ts) & UTS_TXEMPTY))
if (readl(&uart->ts) & UTS_TXFULL) return -EAGAIN; writel(ch, &uart->txd);-- 2.34.1
Hello!
In this driver there are two mxc_serial_putc() and two mxc_serial_getc() function. One for DM and one for non-DM version. It would be really nice to fix also second set of functions.
This commit changes both DM/non-DM putc() functions.
Regards, Loic