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Message-ID: <p4vkqqvfh4kdeq3lqfvyokdflaxodj4xv6ozawettewpaedfvg@6dcktfprvazy>
Date: Thu, 30 May 2024 14:20:33 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Maxime Ripard <mripard@...nel.org>
Cc: 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>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>, Rob Clark <robdclark@...il.com>,
Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>,
Marijn Suijten <marijn.suijten@...ainline.org>, dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/7] drm/connector: hdmi: accept NULL for Audio
Infoframe
On Thu, May 30, 2024 at 10:49:26AM +0200, Maxime Ripard wrote:
> Hi,
>
> On Thu, May 30, 2024 at 02:12:24AM GMT, Dmitry Baryshkov wrote:
> > Allow passing NULL as audio infoframe as a way to disable Audio
> > Infoframe generation.
> >
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > ---
> > drivers/gpu/drm/display/drm_hdmi_state_helper.c | 14 ++++++++++----
> > 1 file changed, 10 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
> > index ce96837eea65..5356723d21f5 100644
> > --- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
> > +++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
> > @@ -681,7 +681,7 @@ EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_update_infoframes);
> > /**
> > * drm_atomic_helper_connector_hdmi_update_audio_infoframe - Update the Audio Infoframe
> > * @connector: A pointer to the HDMI connector
> > - * @frame: A pointer to the audio infoframe to write
> > + * @frame: A pointer to the audio infoframe to write or NULL to disable sending the frame
> > *
> > * This function is meant for HDMI connector drivers to update their
> > * audio infoframe. It will typically be used in one of the ALSA hooks
> > @@ -704,10 +704,16 @@ drm_atomic_helper_connector_hdmi_update_audio_infoframe(struct drm_connector *co
> >
> > mutex_lock(&connector->hdmi.infoframes.lock);
> >
> > - memcpy(&infoframe->data, frame, sizeof(infoframe->data));
> > - infoframe->set = true;
> > + if (frame) {
> > + memcpy(&infoframe->data, frame, sizeof(infoframe->data));
> > + infoframe->set = true;
> > +
> > + ret = write_infoframe(connector, infoframe);
> > + } else {
> > + infoframe->set = false;
> >
> > - ret = write_infoframe(connector, infoframe);
> > + ret = clear_infoframe(connector, infoframe);
> > + }
>
> I'm not entirely sure your commit matches your commit log? It looks like
> you follow the same pattern than the other infoframes and call
> write_infoframe if there's one, or clear_infoframe if there isn't.
>
> So we're never passing NULL to disable? clear_infoframe is called.
This function is being called from the driver, so I want to be able to
call drm_atomic_helper_connector_hdmi_update_audio_infoframe(connector,
NULL) in order to disable sending of the Audio InfoFrame.
--
With best wishes
Dmitry
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