Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | From | Hugo Villeneuve <> | Date | Fri, 21 Jul 2023 12:18:39 -0400 | Subject | [RESEND PATCH v8 09/10] serial: sc16is7xx: add post reset delay |
| |
From: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Make sure we wait at least 3us before initiating communication with the device after reset.
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com> Reviewed-by: Lech Perczak <lech.perczak@camlingroup.com> Tested-by: Lech Perczak <lech.perczak@camlingroup.com> --- drivers/tty/serial/sc16is7xx.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index 49213be60baf..718e982e1efe 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -1526,6 +1526,12 @@ static int sc16is7xx_probe(struct device *dev, regmap_write(s->regmap, SC16IS7XX_IOCONTROL_REG << SC16IS7XX_REG_SHIFT, SC16IS7XX_IOCONTROL_SRESET_BIT); + /* + * After reset, the host must wait at least 3us before initializing a + * communication with the device. + */ + usleep_range(5, 10); + for (i = 0; i < devtype->nr_uart; ++i) { s->p[i].line = i; /* Initialize port data */ -- 2.30.2
| ![\](/images/icornerr.gif) |