On Wed, 05 Jul 2017 11:29:43 +0200, Arnaud Pouliquen wrote:
On 07/05/2017 10:40 AM, Takashi Iwai wrote:
On Wed, 05 Jul 2017 10:15:35 +0200, Kuninori Morimoto wrote:
From: Kuninori Morimoto kuninori.morimoto.gx@renesas.com
Current hdmi-codec driver is using hdmi_controls for "ELD" control. But, hdmi-codec driver might be used from many HDMIs. In such case, they will use same "ELD" name and kernel will indicate below error.
xxx: control x:x:x:ELD:x is already present
hdmi_controls will be registered in soc_probe_component(), and we can replace it by component driver probe function.
This patch registers current hdmi_controls in new hdmi_probe(). If hdmi-codec is used from only 1 device, it will use "ELD" as control name (We can keep compatibility). If hdmi-codec is used from many devices, it will use "ELD.x" as control name.
The de facto standard way as HD-audio does is to pass the device number of each ELD control as same as the corresponding PCM stream number.
thanks,
Takashi
In theory, hdmi_codec_pcm_new already does the job. snd_pcm_add_chmap_ctls instantiates the controls using PCM device ID. So you should observe (with amixer) 2 controls with same name but not same device ID.
Indeed, we can add each ELD control there like a (totally untested) patch below.
thanks,
Takashi
--- diff --git a/sound/soc/codecs/hdmi-codec.c b/sound/soc/codecs/hdmi-codec.c index 22ed0dc88f0a..13d9cf5b1831 100644 --- a/sound/soc/codecs/hdmi-codec.c +++ b/sound/soc/codecs/hdmi-codec.c @@ -399,16 +399,13 @@ static int hdmi_codec_chmap_ctl_get(struct snd_kcontrol *kcontrol, return 0; }
- -static const struct snd_kcontrol_new hdmi_controls[] = { - { - .access = SNDRV_CTL_ELEM_ACCESS_READ | - SNDRV_CTL_ELEM_ACCESS_VOLATILE, - .iface = SNDRV_CTL_ELEM_IFACE_PCM, - .name = "ELD", - .info = hdmi_eld_ctl_info, - .get = hdmi_eld_ctl_get, - }, +static const struct snd_kcontrol_new hdmi_eld_ctl = { + .access = SNDRV_CTL_ELEM_ACCESS_READ | + SNDRV_CTL_ELEM_ACCESS_VOLATILE, + .iface = SNDRV_CTL_ELEM_IFACE_PCM, + .name = "ELD", + .info = hdmi_eld_ctl_info, + .get = hdmi_eld_ctl_get, };
static int hdmi_codec_new_stream(struct snd_pcm_substream *substream, @@ -668,6 +665,7 @@ static int hdmi_codec_pcm_new(struct snd_soc_pcm_runtime *rtd, { struct snd_soc_dai_driver *drv = dai->driver; struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai); + struct snd_kcontrol *kctl; int ret;
dev_dbg(dai->dev, "%s()\n", __func__); @@ -686,7 +684,12 @@ static int hdmi_codec_pcm_new(struct snd_soc_pcm_runtime *rtd, hcp->chmap_info->chmap = hdmi_codec_stereo_chmaps; hcp->chmap_idx = HDMI_CODEC_CHMAP_IDX_UNKNOWN;
- return 0; + /* add ELD ctl with the device number corresponding to the PCM stream */ + kctl = snd_ctl_new1(&hdmi_eld_ctl, dai->component); + if (!kctl) + return -ENOMEM; + kctl->id.device = rtd->pcm->device; + return snd_ctl_add(rtd->card->snd_card, kctl); }
static struct snd_soc_dai_driver hdmi_i2s_dai = { @@ -732,8 +735,6 @@ static int hdmi_of_xlate_dai_id(struct snd_soc_component *component,
static struct snd_soc_codec_driver hdmi_codec = { .component_driver = { - .controls = hdmi_controls, - .num_controls = ARRAY_SIZE(hdmi_controls), .dapm_widgets = hdmi_widgets, .num_dapm_widgets = ARRAY_SIZE(hdmi_widgets), .dapm_routes = hdmi_routes,