[PATCH 7/8] serial: imx: use readl() to optimize FIFO reading loop

[Sergey Organov]

Use readl() instead of heavier imx_uart_readl() in the Rx ISR, as we know
we read registers that must not be cached.

Signed-off-by: Sergey Organov <sorganov at gmail.com>
---
 drivers/tty/serial/imx.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index be00362b8b67..f4236e8995fa 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -890,14 +890,15 @@ static irqreturn_t __imx_uart_rxint(int irq, void *dev_id)
 	struct imx_port *sport = dev_id;
 	unsigned int rx, flg;
 	struct tty_port *port = &sport->port.state->port;
+	typeof(sport->port.membase) membase = sport->port.membase;
 	u32 usr2;
 
 	/* If we received something, check for 0xff flood */
-	usr2 = imx_uart_readl(sport, USR2);
+	usr2 = readl(membase + USR2);
 	if (usr2 & USR2_RDR)
 		imx_uart_check_flood(sport, usr2);
 
-	while ((rx = imx_uart_readl(sport, URXD0)) & URXD_CHARRDY) {
+	while ((rx = readl(membase + URXD0)) & URXD_CHARRDY) {
 		flg = TTY_NORMAL;
 		sport->port.icount.rx++;
 
-- 
2.30.1