Commit 7229b12f authored by Takashi Iwai's avatar Takashi Iwai

ALSA: x86: hdmi: Add single_port option for compatible behavior

The recent support for the multiple PCM devices allowed user to use
multiple HDMI/DP outputs, but at the same time, the PCM stream
assignment has been changed, too.  Due to that, the former PCM#0
(there was only one stream in the past) is likely assigned to a
different one (e.g. PCM#2), and it ends up with the regression when
user sticks with the fixed configuration using the device#0.

Although the multiple monitor support shouldn't matter when user
deploys the backend like PulseAudio that checks the jack detection
state, the behavior change isn't always acceptable for some users.

As a mitigation, this patch introduces an option to switch the
behavior back to the old-good-days: when the new option,
single_port=1, is passed, the driver creates only a single PCM device,
and it's assigned to the first connected one, like the earlier
versions did.  The option is turned off as default still to support
the multiple monitors.

Fixes: 8a2d6ae1 ("ALSA: x86: Register multiple PCM devices for the LPE audio card")
Reported-and-tested-by: default avatarHubert Mantel <>
Signed-off-by: default avatarTakashi Iwai <>
parent fdcc968a
......@@ -50,6 +50,7 @@
/*standard module options for ALSA. This module supports only one card*/
static int hdmi_card_index = SNDRV_DEFAULT_IDX1;
static char *hdmi_card_id = SNDRV_DEFAULT_STR1;
static bool single_port;
module_param_named(index, hdmi_card_index, int, 0444);
......@@ -57,6 +58,9 @@ MODULE_PARM_DESC(index,
module_param_named(id, hdmi_card_id, charp, 0444);
"ID string for INTEL Intel HDMI Audio controller.");
module_param(single_port, bool, 0444);
"Single-port mode (for compatibility)");
* ELD SA bits in the CEA Speaker Allocation data block
......@@ -1579,7 +1583,11 @@ static irqreturn_t display_pipe_interrupt_handler(int irq, void *dev_id)
static void notify_audio_lpe(struct platform_device *pdev, int port)
struct snd_intelhad_card *card_ctx = platform_get_drvdata(pdev);
struct snd_intelhad *ctx = &card_ctx->pcm_ctx[port];
struct snd_intelhad *ctx;
ctx = &card_ctx->pcm_ctx[single_port ? 0 : port];
if (single_port)
ctx->port = port;
......@@ -1816,7 +1824,7 @@ static int hdmi_lpe_audio_probe(struct platform_device *pdev)
card_ctx->num_pipes = pdata->num_pipes;
card_ctx->num_ports = pdata->num_ports;
card_ctx->num_ports = single_port ? 1 : pdata->num_ports;
for_each_port(card_ctx, port) {
struct snd_intelhad *ctx = &card_ctx->pcm_ctx[port];
......@@ -1824,7 +1832,7 @@ static int hdmi_lpe_audio_probe(struct platform_device *pdev)
ctx->card_ctx = card_ctx;
ctx->dev = card_ctx->dev;
ctx->port = port;
ctx->port = single_port ? -1 : port;
ctx->pipe = -1;
INIT_WORK(&ctx->hdmi_audio_wq, had_audio_wq);
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