[PATCH] Revert "serial: max310x: rework RX interrupt handling"

[Alexander Shiyan <shc_work@mail.ru>]

This reverts commit fce3c5c1a2d9cd888f2987662ce17c0c651916b2.

FIFO is triggered 4 intervals after receiving a byte, it's good
when we don't care about the time of reception, but are only
interested in the presence of any activity on the line.
Unfortunately, this method is not suitable for all tasks,
for example, the RS-485 protocol will not work properly,
since the state machine must track the request-response time
and after the timeout expires, a decision is made that the device
on the line is not responding.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
---
 drivers/tty/serial/max310x.c | 29 +++++------------------------
 1 file changed, 5 insertions(+), 24 deletions(-)

diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index 9795b2e8b0b2..1b61d26bb7af 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -1056,9 +1056,9 @@ static int max310x_startup(struct uart_port *port)
 	max310x_port_update(port, MAX310X_MODE1_REG,
 			    MAX310X_MODE1_TRNSCVCTRL_BIT, 0);
 
-	/* Reset FIFOs */
-	max310x_port_write(port, MAX310X_MODE2_REG,
-			   MAX310X_MODE2_FIFORST_BIT);
+	/* Configure MODE2 register & Reset FIFOs*/
+	val = MAX310X_MODE2_RXEMPTINV_BIT | MAX310X_MODE2_FIFORST_BIT;
+	max310x_port_write(port, MAX310X_MODE2_REG, val);
 	max310x_port_update(port, MAX310X_MODE2_REG,
 			    MAX310X_MODE2_FIFORST_BIT, 0);
 
@@ -1086,27 +1086,8 @@ static int max310x_startup(struct uart_port *port)
 	/* Clear IRQ status register */
 	max310x_port_read(port, MAX310X_IRQSTS_REG);
 
-	/*
-	 * Let's ask for an interrupt after a timeout equivalent to
-	 * the receiving time of 4 characters after the last character
-	 * has been received.
-	 */
-	max310x_port_write(port, MAX310X_RXTO_REG, 4);
-
-	/*
-	 * Make sure we also get RX interrupts when the RX FIFO is
-	 * filling up quickly, so get an interrupt when half of the RX
-	 * FIFO has been filled in.
-	 */
-	max310x_port_write(port, MAX310X_FIFOTRIGLVL_REG,
-			   MAX310X_FIFOTRIGLVL_RX(MAX310X_FIFO_SIZE / 2));
-
-	/* Enable RX timeout interrupt in LSR */
-	max310x_port_write(port, MAX310X_LSR_IRQEN_REG,
-			   MAX310X_LSR_RXTO_BIT);
-
-	/* Enable LSR, RX FIFO trigger, CTS change interrupts */
-	val = MAX310X_IRQ_LSR_BIT  | MAX310X_IRQ_RXFIFO_BIT | MAX310X_IRQ_TXEMPTY_BIT;
+	/* Enable RX, TX, CTS change interrupts */
+	val = MAX310X_IRQ_RXEMPTY_BIT | MAX310X_IRQ_TXEMPTY_BIT;
 	max310x_port_write(port, MAX310X_IRQEN_REG, val | MAX310X_IRQ_CTS_BIT);
 
 	return 0;
-- 
2.26.2