linux-kernel - Re: [PATCH 8/8] drm/msm/dp: Support external GPIO HPD with 3rd pinctrl chip

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Message-ID: <CAA8EJpqMug4u1YPxBGfDUT8Cf8F5XckxnJdau-Gm6swyU5VT=w@mail.gmail.com>
Date: Fri, 29 Nov 2024 15:45:29 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Xiangxu Yin <quic_xiangxuy@...cinc.com>
Cc: Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Kuogee Hsieh <quic_khsieh@...cinc.com>, Vinod Koul <vkoul@...nel.org>, 
	Kishon Vijay Abraham I <kishon@...nel.org>, Linus Walleij <linus.walleij@...aro.org>, 
	Bartosz Golaszewski <brgl@...ev.pl>, quic_lliu6@...cinc.com, quic_fangez@...cinc.com, 
	linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org, 
	linux-gpio@...r.kernel.org
Subject: Re: [PATCH 8/8] drm/msm/dp: Support external GPIO HPD with 3rd
 pinctrl chip

On Fri, 29 Nov 2024 at 09:59, Xiangxu Yin <quic_xiangxuy@...cinc.com> wrote:
>
> Add support for handling HPD (Hot Plug Detect) signals via external
> GPIOs connected through pinctrl chips (e.g., Semtech SX1509Q). This
> involves reinitializing the relevant GPIO and binding an interrupt
> handler to process hot plug events. Since external GPIOs only support
> edge interrupts (rising or falling) rather than state interrupts, the
> GPIO state must be read during the first DP bridge HPD enablement. This
> ensures the current connection state is determined and a hot plug event
> is reported accordingly.

NAK, use dp-connector instead.

>
> Signed-off-by: Xiangxu Yin <quic_xiangxuy@...cinc.com>
> ---
>  drivers/gpu/drm/msm/dp/dp_display.c | 83 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 83 insertions(+)


-- 
With best wishes
Dmitry