Allow passing NULL as audio infoframe as a way to disable Audio
Infoframe generation.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.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);
+	}
 
 	mutex_unlock(&connector->hdmi.infoframes.lock);
 

-- 
2.39.2

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@linaro.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.

Maxime

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@linaro.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