From: Johan Hovold <johan@kernel.org>
To: "Łukasz Majczak" <lma@chromium.org>
Cc: Jiri Kosina <jikos@kernel.org>,
Dmitry Torokhov <dtor@chromium.org>,
Benjamin Tissoires <benjamin.tissoires@redhat.com>,
Douglas Anderson <dianders@chromium.org>,
Hans de Goede <hdegoede@redhat.com>,
Maxime Ripard <mripard@kernel.org>,
Kai-Heng Feng <kai.heng.feng@canonical.com>,
Johan Hovold <johan+linaro@kernel.org>,
linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
Radoslaw Biernacki <rad@chromium.org>
Subject: Re: [PATCH v2] HID: i2c-hid: wait for i2c touchpad deep-sleep to power-up transition
Date: Mon, 15 Apr 2024 11:08:49 +0200 [thread overview]
Message-ID: <ZhzuoWgA88CeenMC@hovoldconsulting.com> (raw)
In-Reply-To: <CAE5UKNp3uS9cqDbQjcP3SbfxVi3wPFG4LtP6z=WU_V+M9x6LtQ@mail.gmail.com>
On Thu, Apr 11, 2024 at 04:23:27PM +0200, Łukasz Majczak wrote:
> > Sure, but what about other transactions that are initiated by the host
> > (e.g. SET_POWER)?
> >
> Somehow it is problematic only on reboot and works just fine on
> suspend/resume and
> set_power.
> I will dig more and try to find out what the difference is.
Sounds like it may be related to the i2c_hid_set_power() on shutdown()
then as Kai-Heng pointed out.
That function already handles a similar retry for I2C_HID_PWR_ON during
resume.
> > Perhaps this hack at probe is enough for your use case, but is an
> > incomplete hack and at a minimum you'd need to add a comment explaining
> > why it is there.
> >
> You mean a comment in the code ?
Yes, if this turns out to be needed then there should be a comment
explaining why it is there (and currently also as the delays you used
seem specific for your particular platform).
But hopefully you can find a generic solution to this.
Johan
next prev parent reply other threads:[~2024-04-15 9:08 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-05 10:24 [PATCH v2] HID: i2c-hid: wait for i2c touchpad deep-sleep to power-up transition Lukasz Majczak
2024-04-08 3:18 ` Doug Anderson
2024-04-08 7:27 ` Johan Hovold
2024-04-09 10:53 ` Łukasz Majczak
2024-04-09 15:46 ` Johan Hovold
2024-04-11 14:23 ` Łukasz Majczak
2024-04-12 6:28 ` Kai-Heng Feng
2024-04-15 9:08 ` Johan Hovold [this message]
2024-04-15 12:26 ` Radoslaw Biernacki
2024-04-15 13:37 ` Johan Hovold
2024-04-15 10:28 ` Kenny Levinsen
2024-04-15 12:10 ` Radoslaw Biernacki
2024-04-15 12:13 ` Radoslaw Biernacki
2024-04-15 13:22 ` Johan Hovold
2024-04-15 17:14 ` Kenny Levinsen
2024-04-23 11:32 ` Łukasz Majczak
2024-04-23 13:01 ` Kenny Levinsen
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