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Message-ID: <ZdiLCYKCujs4DgKV@matsya>
Date: Fri, 23 Feb 2024 17:39:45 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Johan Hovold <johan+linaro@...nel.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Robert Foss <rfoss@...nel.org>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Jonas Karlman <jonas@...boo.se>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Kishon Vijay Abraham I <kishon@...nel.org>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Rob Clark <robdclark@...il.com>,
Abhinav Kumar <quic_abhinavk@...cinc.com>,
Kuogee Hsieh <quic_khsieh@...cinc.com>,
freedreno@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-phy@...ts.infradead.org, stable@...r.kernel.org,
Bjorn Andersson <quic_bjorande@...cinc.com>
Subject: Re: [PATCH 5/6] phy: qcom-qmp-combo: fix drm bridge registration
On 17-02-24, 16:02, Johan Hovold wrote:
> Due to a long-standing issue in driver core, drivers may not probe defer
> after having registered child devices to avoid triggering a probe
> deferral loop (see fbc35b45f9f6 ("Add documentation on meaning of
> -EPROBE_DEFER")).
>
> This could potentially also trigger a bug in the DRM bridge
> implementation which does not expect bridges to go away even if device
> links may avoid triggering this (when enabled).
>
> Move registration of the DRM aux bridge to after looking up clocks and
> other resources.
>
> Note that PHY creation can in theory also trigger a probe deferral when
> a 'phy' supply is used. This does not seem to affect the QMP PHY driver
> but the PHY subsystem should be reworked to address this (i.e. by
> separating initialisation and registration of the PHY).
Acked-by: Vinod Koul <vkoul@...nel.org>
--
~Vinod
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