This is a note to let you know that I've just added the patch titled
serial: sc16is7xx: Put IOControl register into regmap_volatile
to the 6.1-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:
serial-sc16is7xx-put-iocontrol-register-into-regmap_volatile.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 77a82cebf0eb023203b4cb2235cab75afc77cccf Mon Sep 17 00:00:00 2001
From: Hui Wang <hui.wang@xxxxxxxxxxxxx>
Date: Mon, 24 Jul 2023 11:47:27 +0800
Subject: serial: sc16is7xx: Put IOControl register into regmap_volatile
From: Hui Wang <hui.wang@xxxxxxxxxxxxx>
commit 77a82cebf0eb023203b4cb2235cab75afc77cccf upstream.
According to the IOControl register bits description in the page 31 of
the product datasheet, we know the bit 3 of IOControl register is
softreset, this bit will self-clearing once the reset finish.
In the probe, the softreset bit is set, and when we read this register
from debugfs/regmap interface, we found the softreset bit is still
setting, this confused us for a while. Finally we found this register
is cached, to read the real value from register, we could put it
into the regmap_volatile().
Signed-off-by: Hui Wang <hui.wang@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230724034727.17335-1-hui.wang@xxxxxxxxxxxxx
Cc: Hugo Villeneuve <hugo@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/sc16is7xx.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -486,6 +486,7 @@ static bool sc16is7xx_regmap_volatile(st
case SC16IS7XX_TXLVL_REG:
case SC16IS7XX_RXLVL_REG:
case SC16IS7XX_IOSTATE_REG:
+ case SC16IS7XX_IOCONTROL_REG:
return true;
default:
break;
Patches currently in stable-queue which might be from hui.wang@xxxxxxxxxxxxx are
queue-6.1/serial-sc16is7xx-put-iocontrol-register-into-regmap_volatile.patch
