linux-kernel - Re: [PATCH v3 3/4] input: misc: pm8941-pwrkey: add software key press debouncing support

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Message-ID: <CAE-0n51WVcbvgRrbi84JWDYAciXrz0LyHHym2VLXhiz_hoX7sg@mail.gmail.com>
Date:   Thu, 3 Feb 2022 21:20:44 +0000
From:   Stephen Boyd <swboyd@...omium.org>
To:     Anjelique Melendez <quic_amelende@...cinc.com>,
        dmitry.torokhov@...il.com
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, collinsd@...eaurora.org,
        bjorn.andersson@...aro.org, skakit@...eaurora.org
Subject: Re: [PATCH v3 3/4] input: misc: pm8941-pwrkey: add software key press
 debouncing support

Quoting Anjelique Melendez (2022-02-02 17:08:07)
> From: David Collins <collinsd@...eaurora.org>
>
> On certain PMICs, an unexpected assertion of KPDPWR_DEB (the
> positive logic hardware debounced power key signal) may be seen
> during the falling edge of KPDPWR_N (i.e. a power key press) when
> it occurs close to the rising edge of SLEEP_CLK.  This then
> triggers a spurious KPDPWR interrupt.
>
> Handle this issue by adding software debouncing support to ignore
> key events that occur within the hardware debounce delay after the
> most recent key release event.
>
> Signed-off-by: David Collins <collinsd@...eaurora.org>
> Signed-off-by: Anjelique Melendez <quic_amelende@...cinc.com>
> ---

Is there a Fixes tag that should be here? Is it a new problem with newer
PMICs?