6.1-stable review patch. If anyone has any objections, please let me know. ------------------ 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;
