This is a note to let you know that I've just added the patch titled
Revert "serial: max310x: rework RX interrupt handling"
to the 5.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
revert-serial-max310x-rework-rx-interrupt-handling.patch
and it can be found in the queue-5.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2334de198fed3da72e9785ecdd691d101aa96e77 Mon Sep 17 00:00:00 2001
From: Alexander Shiyan <shc_work@xxxxxxx>
Date: Wed, 17 Feb 2021 11:06:08 +0300
Subject: Revert "serial: max310x: rework RX interrupt handling"
From: Alexander Shiyan <shc_work@xxxxxxx>
commit 2334de198fed3da72e9785ecdd691d101aa96e77 upstream.
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@xxxxxxx>
Link: https://lore.kernel.org/r/20210217080608.31192-1-shc_work@xxxxxxx
Fixes: fce3c5c1a2d9 ("serial: max310x: rework RX interrupt handling")
Cc: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/max310x.c | 29 +++++------------------------
1 file changed, 5 insertions(+), 24 deletions(-)
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -1056,9 +1056,9 @@ static int max310x_startup(struct uart_p
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_p
/* 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;
Patches currently in stable-queue which might be from shc_work@xxxxxxx are
queue-5.11/revert-serial-max310x-rework-rx-interrupt-handling.patch
