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Message-ID: <CAA8EJpoaEuDu7_84Ce1=XoMgf+GZzTueZNKLR51Nd1-8Z82SsQ@mail.gmail.com>
Date: Tue, 7 Jan 2025 17:34:13 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Maxime Ripard <mripard@...nel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Dave Stevenson <dave.stevenson@...pberrypi.com>, Maíra Canal <mcanal@...lia.com>,
Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>, Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>, Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...il.com>, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC/RFT 1/9] drm/connector: add CEC-related fields
On Tue, 7 Jan 2025 at 16:27, Maxime Ripard <mripard@...nel.org> wrote:
>
> Hi,
>
> Thanks a lot for working on this.
>
> On Wed, Dec 25, 2024 at 01:10:09AM +0200, Dmitry Baryshkov wrote:
> > As a preparation to adding HDMI CEC helper code, add CEC-related fields
> > to the struct drm_connector. Include both cec_adapter and cec_notifier,
> > allowing drivers to select which one to use. The unregister callback
> > is provided to let drivers unregister CEC-related data in a generic way
> > without polluting drm_connector.c with dependencies on the CEC
> > functions.
> >
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > ---
> > drivers/gpu/drm/drm_connector.c | 23 ++++++++++++++++++++++
> > include/drm/drm_connector.h | 43 +++++++++++++++++++++++++++++++++++++++++
> > 2 files changed, 66 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> > index 1383fa9fff9bcf31488453e209a36c6fe97be2f1..ef299733041e2c64bebd73c3fe21d4492bc07d3a 100644
> > --- a/drivers/gpu/drm/drm_connector.c
> > +++ b/drivers/gpu/drm/drm_connector.c
> > @@ -279,6 +279,7 @@ static int drm_connector_init_only(struct drm_device *dev,
> > INIT_LIST_HEAD(&connector->probed_modes);
> > INIT_LIST_HEAD(&connector->modes);
> > mutex_init(&connector->mutex);
> > + mutex_init(&connector->cec.mutex);
> > mutex_init(&connector->eld_mutex);
> > mutex_init(&connector->edid_override_mutex);
> > mutex_init(&connector->hdmi.infoframes.lock);
> > @@ -698,6 +699,26 @@ static void drm_mode_remove(struct drm_connector *connector,
> > drm_mode_destroy(connector->dev, mode);
> > }
> >
> > +/**
> > + * drm_connector_cec_unregister - clean up CEC registration
> > + * @connector: connector to cleanup
> > + *
> > + * Reverse corresponding CEC registration. This function is supposed to be
> > + * called only by bridge drivers which need to handle CEC manually. Normally
> > + * CEC adapter or notifier are automatically unregistered during drm_connector
> > + * teardown.
> > + */
> > +void drm_connector_cec_unregister(struct drm_connector *connector)
> > +{
> > + mutex_lock(&connector->cec.mutex);
> > +
> > + if (connector->cec.unregister)
> > + connector->cec.unregister(connector);
> > +
> > + mutex_unlock(&connector->cec.mutex);
> > +}
> > +EXPORT_SYMBOL(drm_connector_cec_unregister);
>
> Why do we need to have that function public?
It is being used by drivers during conversion.
>
> > /**
> > * drm_connector_cleanup - cleans up an initialised connector
> > * @connector: connector to cleanup
> > @@ -718,6 +739,8 @@ void drm_connector_cleanup(struct drm_connector *connector)
> >
> > platform_device_unregister(connector->hdmi_audio.codec_pdev);
> >
> > + drm_connector_cec_unregister(connector);
> > +
> > if (connector->privacy_screen) {
> > drm_privacy_screen_put(connector->privacy_screen);
> > connector->privacy_screen = NULL;
> > diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> > index f13d597370a30dc1b14c630ee00145256052ba56..feecd02e7c698cc0c553b79048c9130f69121012 100644
> > --- a/include/drm/drm_connector.h
> > +++ b/include/drm/drm_connector.h
> > @@ -46,6 +46,7 @@ struct drm_property_blob;
> > struct drm_printer;
> > struct drm_privacy_screen;
> > struct drm_edid;
> > +struct cec_adapter;
> > struct edid;
> > struct hdmi_codec_daifmt;
> > struct hdmi_codec_params;
> > @@ -1832,6 +1833,41 @@ struct drm_connector_hdmi {
> > } infoframes;
> > };
> >
> > +/**
> > + * struct drm_connector_cec - DRM Connector CEC-related structure
> > + */
> > +struct drm_connector_cec {
> > + /**
> > + * @mutex: protects all CEC-related fields
> > + */
> > + struct mutex mutex;
> > +
> > + /**
> > + * @adap: CEC adapter corresponding to the DRM connector.
> > + */
> > + struct cec_adapter *adapter;
> > +
> > + /**
> > + * @notifier: CEC notifier corresponding to the DRM connector.
> > + */
> > + struct cec_notifier *notifier;
> > +
> > + /**
> > + * @adap_unregister: unregister CEC adapter / notifier.
> > + *
> > + * The callback to unregister CEC adapter or notifier, so that the core
> > + * DRM layer doesn't depend on the CEC_CORE.
> > + */
> > + void (*unregister)(struct drm_connector *connector);
> > +
> > + /**
> > + * @uninit_cec_cb: teardown CEC adapter
> > + *
> > + * Perform additional tasks to teardown the CEC adapter.
> > + */
> > + void (*uninit_cec)(struct drm_connector *connector);
> > +};
>
> I'd rather stay consistent with the video and audio support and have the
> functions in a separate structure.
Ack. And also fix one of the linuxdoc comments.
--
With best wishes
Dmitry
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