From: Lee Jones <lee@kernel.org>
To: Benjamin Bara <bbara93@gmail.com>
Cc: benjamin.bara@skidata.com, dmitry.osipenko@collabora.com,
jonathanh@nvidia.com, linux-i2c@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org,
peterz@infradead.org, rafael.j.wysocki@intel.com,
richard.leitner@linux.dev, treding@nvidia.com, wsa@kernel.org
Subject: Re: [PATCH v5 6/6] mfd: tps6586x: register restart handler
Date: Fri, 21 Apr 2023 08:25:07 +0100 [thread overview]
Message-ID: <20230421072507.GK996918@google.com> (raw)
In-Reply-To: <20230420143229.541283-1-bbara93@gmail.com>
On Thu, 20 Apr 2023, Benjamin Bara wrote:
> Thanks for the feedback!
>
> On Thu, 20 Apr 2023 at 16:04, Lee Jones <lee@kernel.org> wrote:
> > Why 20 here and 50 in the other patch?
>
> The data sheet states:
> The device will enter the SLEEP or HARD REBOOT state 10ms after the
> SLEEP REQUEST or REBOOT REQUEST is initiated.
>
> Also:
> When the reboot request state is set an internal timer TWAIT (10ms typ)
> is started (...). The reboot request ends when t > TWAIT.
>
> But in the electrical characteristics, TWAIT is given as min 18, typ 20,
> max 22.
>
> In my observations, reboot took like typ 15ms and sleep typ 25ms, but
> this might be very board-specific. I can set both to 50ms to be "on the
> safe side" and have a common value?
The confusing part for me, the reader, was that both say "will take at
least 10ms" or words to that effect, but they sleep for a different
amount of time.
--
Lee Jones [李琼斯]
next prev parent reply other threads:[~2023-04-21 7:25 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-18 11:09 [PATCH v5 0/6] mfd: tps6586x: register restart handler Benjamin Bara
2023-04-18 11:10 ` [PATCH v5 1/6] kernel/reboot: emergency_restart: set correct system_state Benjamin Bara
2023-04-18 11:10 ` [PATCH v5 2/6] i2c: core: run atomic i2c xfer when !preemptible Benjamin Bara
2023-04-18 11:10 ` [PATCH v5 3/6] kernel/reboot: add device to sys_off_handler Benjamin Bara
2023-04-18 11:10 ` [PATCH v5 4/6] kernel/reboot: sys_off_notify: always return NOTIFY_DONE Benjamin Bara
2023-04-18 11:10 ` [PATCH v5 5/6] mfd: tps6586x: use devm-based power off handler Benjamin Bara
2023-04-20 14:02 ` Lee Jones
2023-04-18 11:10 ` [PATCH v5 6/6] mfd: tps6586x: register restart handler Benjamin Bara
2023-04-20 14:04 ` Lee Jones
2023-04-20 14:32 ` Benjamin Bara
2023-04-21 7:25 ` Lee Jones [this message]
2023-04-21 7:32 ` Benjamin Bara
2023-04-21 7:42 ` Lee Jones
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