linux-kernel - Re: [PATCH v4 02/16] dt-bindings: display/msm: hdmi: drop hpd-gpios

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Message-ID: <ma7ur32qudbxaqt7fejgxiqf4vqvsd2o2oki6cz5enwchdli4n@xk5dptvjbkw2>
Date: Wed, 12 Feb 2025 02:16:07 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Rob Clark <robdclark@...il.com>, 
	Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konradybcio@...nel.org>, Simona Vetter <simona.vetter@...ll.ch>, 
	linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 02/16] dt-bindings: display/msm: hdmi: drop hpd-gpios

On Tue, Feb 11, 2025 at 09:26:31AM +0100, Krzysztof Kozlowski wrote:
> On Sun, Feb 09, 2025 at 07:04:46AM +0200, Dmitry Baryshkov wrote:
> > Supporting simultaneous check of native HPD and the external GPIO proved
> > to be less stable than just native HPD. Drop the hpd-gpios from the
> > bindings. This is not a breaking change, since the HDMI block has been
> > using both GPIO _and_ internal HPD anyway. In case the native HPD
> > doesn't work users are urged to switch to specifying the hpd-gpios
> > property to the hdmi-connector device.
> 
> In that case users would need to update their DTS/DTB, so that's an ABI
> break.
> 
> Please deprecate the property here (deprecated: true) and keep support
> in the driver.

I will expand the explanation for the need of the ABI break. Yes, it's a
bad idea. No, it doesn't prevent the board from working. Yes, it needs
to be done.

-- 
With best wishes
Dmitry