linux-kernel - Re: [PATCH v5 2/2] HID: i2c-hid: elan: Add ili9882t timing

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Message-ID: <CAD=FV=UPSwWpkGN3UyFm1c84gj7iDC7dYrT9CCqWnqkTun-4cg@mail.gmail.com>
Date:   Fri, 9 Jun 2023 09:14:05 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Cong Yang <yangcong5@...qin.corp-partner.google.com>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, dmitry.torokhov@...il.com, jikos@...nel.org,
        benjamin.tissoires@...hat.com, hsinyi@...gle.com,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/2] HID: i2c-hid: elan: Add ili9882t timing

Hi,

On Thu, Jun 8, 2023 at 11:36 PM Cong Yang
<yangcong5@...qin.corp-partner.google.com> wrote:
>
> The ili9882t is a TDDI IC (Touch with Display Driver). The
> datasheet specifies there should be 60ms between touch SDA
> sleep and panel RESX. Doug's series[1] allows panels and
> touchscreens to power on/off together, so we can add the 65 ms
> delay in i2c_hid_core_suspend before panel_unprepare.
>
> Because ili9882t touchscrgeen is a panel follower, and
> needs to use vccio-supply instead of vcc33-supply, so set
> it NULL to ili9882t_chip_data, then not use vcc33 regulator.
>
> [1]: https://lore.kernel.org/r/20230607215224.2067679-1-dianders@chromium.org
>
> Signed-off-by: Cong Yang <yangcong5@...qin.corp-partner.google.com>
> ---
>  drivers/hid/i2c-hid/i2c-hid-of-elan.c | 50 ++++++++++++++++++++-------
>  1 file changed, 38 insertions(+), 12 deletions(-)

This seems reasonable to me now, but only makes sense to land if the
panel follower patch series [1] lands. That series is currently at v2
and will at least need a v3.

[1] https://lore.kernel.org/r/20230607215224.2067679-1-dianders@chromium.org