From: Greg KH <gregkh@linuxfoundation.org>
To: Hugo Villeneuve <hugo@hugovil.com>
Cc: robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
conor+dt@kernel.org, jirislaby@kernel.org, jringle@gridpoint.com,
isaac.true@canonical.com, jesse.sung@canonical.com,
l.perczak@camlintechnologies.com, tomasz.mon@camlingroup.com,
linux-serial@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org,
Hugo Villeneuve <hvilleneuve@dimonoff.com>,
Lech Perczak <lech.perczak@camlingroup.com>
Subject: Re: [PATCH v9 09/10] serial: sc16is7xx: add post reset delay
Date: Mon, 31 Jul 2023 17:57:50 +0200 [thread overview]
Message-ID: <2023073159-follow-resume-cc9b@gregkh> (raw)
In-Reply-To: <20230725142343.1724130-10-hugo@hugovil.com>
On Tue, Jul 25, 2023 at 10:23:41AM -0400, Hugo Villeneuve wrote:
> From: Hugo Villeneuve <hvilleneuve@dimonoff.com>
>
> Make sure we wait at least 3us before initiating communication with
> the device after reset.
That says what you do, but not _why_ you do it?
Please read the kernel documentation again for how to write a good
changelog text. It's usually the hardest part of submitting a patch.
>
> 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);
5, 10 is NOT 3us.
:(
next prev parent reply other threads:[~2023-07-31 15:58 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-25 14:23 [PATCH v9 00/10] serial: sc16is7xx: fix GPIO regression and rs485 improvements Hugo Villeneuve
2023-07-25 14:23 ` [PATCH v9 01/10] serial: sc16is7xx: fix broken port 0 uart init Hugo Villeneuve
2023-07-31 15:52 ` Greg KH
2023-08-01 17:16 ` Hugo Villeneuve
2023-08-03 7:54 ` Greg KH
2023-08-03 13:04 ` Hugo Villeneuve
2023-07-25 14:23 ` [PATCH v9 02/10] serial: sc16is7xx: mark IOCONTROL register as volatile Hugo Villeneuve
2023-07-31 15:50 ` Greg KH
2023-07-31 16:22 ` Hugo Villeneuve
2023-07-25 14:23 ` [PATCH v9 03/10] serial: sc16is7xx: remove obsolete out_thread label Hugo Villeneuve
2023-07-31 15:53 ` Greg KH
2023-08-01 17:29 ` Hugo Villeneuve
2023-08-03 7:55 ` Greg KH
2023-07-25 14:23 ` [PATCH v9 04/10] serial: sc16is7xx: refactor GPIO controller registration Hugo Villeneuve
2023-07-31 15:55 ` Greg KH
2023-08-03 16:14 ` Hugo Villeneuve
2023-08-04 13:14 ` Greg KH
2023-08-04 14:15 ` Hugo Villeneuve
2023-08-04 15:09 ` Greg KH
2023-08-07 14:57 ` Hugo Villeneuve
2023-07-25 14:23 ` [PATCH v9 05/10] dt-bindings: sc16is7xx: Add property to change GPIO function Hugo Villeneuve
2023-07-25 14:23 ` [PATCH v9 06/10] serial: sc16is7xx: fix regression with GPIO configuration Hugo Villeneuve
2023-07-31 15:58 ` Greg KH
2023-08-03 14:18 ` Hugo Villeneuve
2023-08-03 21:04 ` Andy Shevchenko
2023-08-04 4:53 ` Greg KH
2023-07-25 14:23 ` [PATCH v9 07/10] serial: sc16is7xx: fix bug when first setting GPIO direction Hugo Villeneuve
2023-07-25 14:23 ` [PATCH v9 08/10] serial: sc16is7xx: add call to get rs485 DT flags and properties Hugo Villeneuve
2023-07-31 15:59 ` Greg KH
2023-08-03 14:38 ` Hugo Villeneuve
2023-08-04 13:14 ` Greg KH
2023-07-25 14:23 ` [PATCH v9 09/10] serial: sc16is7xx: add post reset delay Hugo Villeneuve
2023-07-31 15:57 ` Greg KH [this message]
2023-07-31 17:00 ` Hugo Villeneuve
2023-07-25 14:23 ` [PATCH v9 10/10] serial: sc16is7xx: improve comments about variants Hugo Villeneuve
2023-07-31 15:56 ` Greg KH
2023-08-03 13:28 ` Hugo Villeneuve
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