diff options
| author | Ulrich Hecht <uli+renesas@fpond.eu> | 2021-04-15 12:35:47 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-15 13:59:16 +0300 |
| commit | f9f54983005cdd1060b85b16933677442139d88d (patch) | |
| tree | dd6c65c718f2c227f211ac2e37171f55119a1cbc /drivers/tty | |
| parent | 5ffa6e344a1c92a27c242f500fc74e6eb361a4bc (diff) | |
| download | linux-f9f54983005cdd1060b85b16933677442139d88d.tar.xz | |
serial: sh-sci: remove obsolete latency workaround
Since the transition to hrtimers there is no more need to set a minimum
RX timeout to work around latency issues.
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Ulrich Hecht <uli+renesas@fpond.eu>
Link: https://lore.kernel.org/r/20210415093547.21639-1-uli+renesas@fpond.eu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/sh-sci.c | 13 |
1 files changed, 1 insertions, 12 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index e3af97a59856..ef37fdf37612 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -2609,21 +2609,10 @@ done: udelay(DIV_ROUND_UP(10 * 1000000, baud)); } - /* - * Calculate delay for 2 DMA buffers (4 FIFO). - * See serial_core.c::uart_update_timeout(). - * With 10 bits (CS8), 250Hz, 115200 baud and 64 bytes FIFO, the above - * function calculates 1 jiffie for the data plus 5 jiffies for the - * "slop(e)." Then below we calculate 5 jiffies (20ms) for 2 DMA - * buffers (4 FIFO sizes), but when performing a faster transfer, the - * value obtained by this formula is too small. Therefore, if the value - * is smaller than 20ms, use 20ms as the timeout value for DMA. - */ + /* Calculate delay for 2 DMA buffers (4 FIFO). */ s->rx_frame = (10000 * bits) / (baud / 100); #ifdef CONFIG_SERIAL_SH_SCI_DMA s->rx_timeout = s->buf_len_rx * 2 * s->rx_frame; - if (s->rx_timeout < 20) - s->rx_timeout = 20; #endif if ((termios->c_cflag & CREAD) != 0) |