linux-kernel - Re: [PATCH] pinctrl: qcom: x1e80100: Bypass PDC wakeup parent for now

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Message-ID: <265abf82-5867-4e21-9ec6-a0b52b851434@kernel.org>
Date: Fri, 30 Aug 2024 11:27:31 +0200
From: Konrad Dybcio <konradybcio@...nel.org>
To: Stephan Gerhold <stephan.gerhold@...aro.org>,
 Linus Walleij <linus.walleij@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>,
 Rajendra Nayak <quic_rjendra@...cinc.com>,
 Maulik Shah <quic_mkshah@...cinc.com>, Sibi Sankar <quic_sibis@...cinc.com>,
 Abel Vesa <abel.vesa@...aro.org>, Johan Hovold <johan@...nel.org>,
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] pinctrl: qcom: x1e80100: Bypass PDC wakeup parent for now

On 30.08.2024 11:09 AM, Stephan Gerhold wrote:
> On X1E80100, GPIO interrupts for wakeup-capable pins have been broken since
> the introduction of the pinctrl driver. This prevents keyboard and touchpad
> from working on most of the X1E laptops. So far we have worked around this
> by manually building a kernel with the "wakeup-parent" removed from the
> pinctrl node in the device tree, but we cannot expect all users to do that.
> 
> Implement a similar workaround in the driver by clearing the wakeirq_map
> for X1E80100. This avoids using the PDC wakeup parent for all GPIOs
> and handles the interrupts directly in the pinctrl driver instead.
> 
> The PDC driver needs additional changes to support X1E80100 properly.
> Adding a workaround separately first allows to land the necessary PDC
> changes through the normal release cycle, while still solving the more
> critical problem with keyboard and touchpad on the current stable kernel
> versions. Bypassing the PDC is enough for now, because we have not yet
> enabled the deep idle states where using the PDC becomes necessary.
> 
> Cc: stable@...r.kernel.org
> Fixes: 05e4941d97ef ("pinctrl: qcom: Add X1E80100 pinctrl driver")
> Signed-off-by: Stephan Gerhold <stephan.gerhold@...aro.org>
> ---

Reviewed-by: Konrad Dybcio <konradybcio@...nel.org>

Konrad