On Sat, Feb 22, 2025 at 11:29:21AM +0100, Stefan Wahren wrote:
> From: David Turner <david.tur...@raspberrypi.com>
>
> Add ALSA jack detection to the vc4-hdmi audio driver so userspace knows
> when to add/remove HDMI audio devices.
>
> Signed-off-by: David Turner <david.tur...@raspberrypi.com>
> Signed-off-by: Stefan Wahren <wahre...@gmx.net>
> ---
> drivers/gpu/drm/vc4/vc4_hdmi.c | 26 ++++++++++++++++++++++++--
> drivers/gpu/drm/vc4/vc4_hdmi.h | 7 +++++++
> 2 files changed, 31 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index 47d9ada98430..d24ae86d799e 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -51,6 +51,7 @@
> #include <linux/reset.h>
> #include <sound/dmaengine_pcm.h>
> #include <sound/hdmi-codec.h>
> +#include <sound/jack.h>
> #include <sound/pcm_drm_eld.h>
> #include <sound/pcm_params.h>
> #include <sound/soc.h>
> @@ -386,6 +387,12 @@ static void vc4_hdmi_handle_hotplug(struct vc4_hdmi
> *vc4_hdmi,
> struct drm_connector *connector = &vc4_hdmi->connector;
> int ret;
>
> + /*
> + * Needs to be called for both connects and disconnects for HDMI
> + * audio hotplug to work correctly.
> + */
> + drm_atomic_helper_connector_hdmi_hotplug(connector, status);
> +
> /*
> * NOTE: This function should really be called with vc4_hdmi->mutex
> * held, but doing so results in reentrancy issues since
> @@ -405,8 +412,6 @@ static void vc4_hdmi_handle_hotplug(struct vc4_hdmi
> *vc4_hdmi,
> return;
> }
>
> - drm_atomic_helper_connector_hdmi_hotplug(connector, status);
> -
> cec_s_phys_addr(vc4_hdmi->cec_adap,
> connector->display_info.source_physical_address, false);
>
> @@ -2203,6 +2208,22 @@ static const struct drm_connector_hdmi_audio_funcs
> vc4_hdmi_audio_funcs = {
> .shutdown = vc4_hdmi_audio_shutdown,
> };
>
> +static int vc4_hdmi_codec_init(struct snd_soc_pcm_runtime *rtd)
> +{
> + struct vc4_hdmi *vc4_hdmi = snd_soc_card_get_drvdata(rtd->card);
> + struct snd_soc_component *component = snd_soc_rtd_to_codec(rtd,
> 0)->component;
> + int ret;
> +
> + ret = snd_soc_card_jack_new(rtd->card, "HDMI Jack", SND_JACK_LINEOUT,
> + &vc4_hdmi->hdmi_jack);
> + if (ret) {
> + dev_err(rtd->dev, "HDMI Jack creation failed: %d\n", ret);
> + return ret;
> + }
> +
> + return snd_soc_component_set_jack(component, &vc4_hdmi->hdmi_jack,
> NULL);
PLease excuse my ignorance, but dows this work. In other words, how is
the driver exporting the plugged state through this jack?
> +}
> +
> static int vc4_hdmi_audio_init(struct vc4_hdmi *vc4_hdmi)
> {
> const struct vc4_hdmi_register *mai_data =
> @@ -2316,6 +2337,7 @@ static int vc4_hdmi_audio_init(struct vc4_hdmi
> *vc4_hdmi)
> dai_link->cpus->dai_name = dev_name(dev);
> dai_link->codecs->name =
> dev_name(&vc4_hdmi->connector.hdmi_audio.codec_pdev->dev);
> dai_link->platforms->name = dev_name(dev);
> + dai_link->init = vc4_hdmi_codec_init;
>
> card->dai_link = dai_link;
> card->num_links = 1;
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h
> index e3d989ca302b..a31157c99bee 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.h
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
> @@ -4,6 +4,7 @@
> #include <drm/drm_connector.h>
> #include <media/cec.h>
> #include <sound/dmaengine_pcm.h>
> +#include <sound/hdmi-codec.h>
> #include <sound/soc.h>
>
> #include "vc4_drv.h"
> @@ -211,6 +212,12 @@ struct vc4_hdmi {
> * KMS hooks. Protected by @mutex.
> */
> enum hdmi_colorspace output_format;
> +
> + /**
> + * @hdmi_jack: Represents the connection state of the HDMI plug, for
> + * ALSA jack detection.
> + */
> + struct snd_soc_jack hdmi_jack;
> };
>
> #define connector_to_vc4_hdmi(_connector) \
> --
> 2.34.1
>
--
With best wishes
Dmitry
