Re: [PATCH v3 1/7] drm/connector: hdmi: accept NULL for Audio Infoframe

[Maxime Ripard]

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@xxxxxxxxxx>
> ---
>  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

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