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serial: imx: stop using USR2 in FIFO reading loop

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The chip provides all the needed bits in the URXD0 register that we read
anyway for data, so get rid of reading USR2 and use only URXD0 bits
instead.

Signed-off-by: Sergey Organov <sorganov@gmail.com>
Link: https://lore.kernel.org/r/20230201142700.4346-7-sorganov@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sergey Organov
2023-02-01 17:26:59 +03:00
committed by Greg Kroah-Hartman
parent 0fbca4798a
commit 53701b6d2c
1 changed files with 6 additions and 12 deletions
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18
drivers/tty/serial/imx.c
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@@ -894,27 +894,21 @@ static irqreturn_t __imx_uart_rxint(int irq, void *dev_id)
struct tty_port *port = &sport->port.state->port;
u32 usr2;
usr2 = imx_uart_readl(sport, USR2);
/* If we received something, check for 0xff flood */
usr2 = imx_uart_readl(sport, USR2);
if (usr2 & USR2_RDR)
imx_uart_check_flood(sport, usr2);
for ( ; usr2 & USR2_RDR; usr2 = imx_uart_readl(sport, USR2)) {
while ((rx = imx_uart_readl(sport, URXD0)) & URXD_CHARRDY) {
flg = TTY_NORMAL;
sport->port.icount.rx++;
rx = imx_uart_readl(sport, URXD0);
if (usr2 & USR2_BRCD) {
imx_uart_writel(sport, USR2_BRCD, USR2);
if (uart_handle_break(&sport->port))
continue;
}
if (unlikely(rx & URXD_ERR)) {
if (rx & URXD_BRK)
if (rx & URXD_BRK) {
sport->port.icount.brk++;
if (uart_handle_break(&sport->port))
continue;
}
else if (rx & URXD_PRERR)
sport->port.icount.parity++;
else if (rx & URXD_FRMERR)