From: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
To: Hugo Villeneuve <hugo@hugovil.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
conor+dt@kernel.org, Jiri Slaby <jirislaby@kernel.org>,
jringle@gridpoint.com, tomasz.mon@camlingroup.com,
l.perczak@camlintechnologies.com,
linux-serial <linux-serial@vger.kernel.org>,
devicetree@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
linux-gpio@vger.kernel.org,
Hugo Villeneuve <hvilleneuve@dimonoff.com>
Subject: Re: [PATCH v3 04/11] serial: sc16is7xx: add post reset delay
Date: Thu, 25 May 2023 14:05:35 +0300 (EEST) [thread overview]
Message-ID: <1ae6fb11-6aa8-66e-86a-a9b5a6403f5e@linux.intel.com> (raw)
In-Reply-To: <20230525040324.3773741-5-hugo@hugovil.com>
On Thu, 25 May 2023, Hugo Villeneuve wrote:
> 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>
> ---
> 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 a7c4da3cfd2b..af7e66db54b4 100644
> --- a/drivers/tty/serial/sc16is7xx.c
> +++ b/drivers/tty/serial/sc16is7xx.c
> @@ -1428,6 +1428,12 @@ 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(3, 5);
> +
> for (i = 0; i < devtype->nr_uart; ++i) {
> s->p[i].line = i;
> /* Initialize port data */
Does this fix a problem? You don't have a Fixes tag nor did you describe
a problem that arises if the is not there in the changelog.
--
i.
next prev parent reply other threads:[~2023-05-25 11:05 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-25 4:03 [PATCH v3 00/11] serial: sc16is7xx: fix GPIO regression and rs485 improvements Hugo Villeneuve
2023-05-25 4:03 ` [PATCH v3 01/11] serial: sc16is7xx: fix syntax error in comments Hugo Villeneuve
2023-05-25 4:03 ` [PATCH v3 02/11] serial: sc16is7xx: improve comments about variants Hugo Villeneuve
2023-05-25 4:03 ` [PATCH v3 03/11] serial: sc16is7xx: mark IOCONTROL register as volatile Hugo Villeneuve
2023-05-25 11:02 ` Ilpo Järvinen
2023-05-25 13:45 ` Hugo Villeneuve
2023-05-25 4:03 ` [PATCH v3 04/11] serial: sc16is7xx: add post reset delay Hugo Villeneuve
2023-05-25 10:30 ` andy.shevchenko
2023-05-25 13:18 ` Hugo Villeneuve
2023-05-25 11:05 ` Ilpo Järvinen [this message]
2023-05-25 14:05 ` Hugo Villeneuve
2023-05-25 4:03 ` [PATCH v3 05/11] serial: sc16is7xx: fix broken port 0 uart init Hugo Villeneuve
2023-05-25 11:20 ` Ilpo Järvinen
2023-05-25 15:10 ` Hugo Villeneuve
2023-05-25 4:03 ` [PATCH v3 06/11] serial: sc16is7xx: fix bug when first setting GPIO direction Hugo Villeneuve
2023-05-25 11:10 ` andy.shevchenko
2023-05-25 14:24 ` Hugo Villeneuve
2023-05-25 4:03 ` [PATCH v3 07/11] dt-bindings: sc16is7xx: Add property to change GPIO function Hugo Villeneuve
2023-05-25 11:11 ` andy.shevchenko
2023-05-25 14:34 ` Hugo Villeneuve
2023-05-25 15:15 ` Conor Dooley
2023-05-26 18:28 ` andy.shevchenko
2023-05-25 4:03 ` [PATCH v3 08/11] serial: sc16is7xx: fix regression with GPIO configuration Hugo Villeneuve
2023-05-25 11:19 ` andy.shevchenko
2023-05-25 15:02 ` Hugo Villeneuve
2023-05-26 18:34 ` andy.shevchenko
2023-05-25 12:03 ` Ilpo Järvinen
2023-05-25 15:19 ` Hugo Villeneuve
2023-05-25 4:03 ` [PATCH v3 09/11] serial: sc16is7xx: add I/O register translation offset Hugo Villeneuve
2023-05-25 11:22 ` andy.shevchenko
2023-05-25 15:31 ` Hugo Villeneuve
2023-05-25 17:20 ` Hugo Villeneuve
2023-05-26 18:36 ` andy.shevchenko
2023-05-25 12:10 ` Ilpo Järvinen
2023-05-25 15:25 ` Hugo Villeneuve
2023-05-25 4:03 ` [PATCH v3 10/11] serial: sc16is7xx: add call to get rs485 DT flags and properties Hugo Villeneuve
2023-05-25 12:17 ` Ilpo Järvinen
2023-05-25 4:03 ` [PATCH v3 11/11] serial: sc16is7xx: add dump registers function Hugo Villeneuve
2023-05-25 11:26 ` andy.shevchenko
2023-05-25 19:49 ` Hugo Villeneuve
2023-05-26 18:38 ` andy.shevchenko
2023-05-28 11:56 ` Greg KH
2023-05-25 10:27 ` [PATCH v3 00/11] serial: sc16is7xx: fix GPIO regression and rs485 improvements andy.shevchenko
2023-05-25 13:26 ` Hugo Villeneuve
2023-05-25 13:37 ` Andy Shevchenko
2023-05-25 13:39 ` Hugo Villeneuve
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