[PATCH AUTOSEL 6.2 20/45] ASoC: hdmi-codec: only startup/shutdown on supported streams

[Sasha Levin]

From: Emil Abildgaard Svendsen <EMAS@xxxxxxxxxxxxxxx>

[ Upstream commit e041a2a550582106cba6a7c862c90dfc2ad14492 ]

Currently only one stream is supported. This isn't usally a problem
until you have a multi codec audio card. Because the audio card will run
startup and shutdown on both capture and playback streams. So if your
hdmi-codec only support either playback or capture. Then ALSA can't open
for playback and capture.

This patch will ignore if startup and shutdown are called with a non
supported stream. Thus, allowing an audio card like this:

           +-+
 cpu1 <--@-| |-> codec1 (HDMI-CODEC)
           | |<- codec2 (NOT HDMI-CODEC)
           +-+

Signed-off-by: Emil Svendsen <emas@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230309065432.4150700-2-emas@xxxxxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 sound/soc/codecs/hdmi-codec.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sound/soc/codecs/hdmi-codec.c b/sound/soc/codecs/hdmi-codec.c
index 74cbbe16f9aec..a22f2ec95901f 100644
--- a/sound/soc/codecs/hdmi-codec.c
+++ b/sound/soc/codecs/hdmi-codec.c
@@ -428,8 +428,13 @@ static int hdmi_codec_startup(struct snd_pcm_substream *substream,
 {
 	struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
 	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+	bool has_capture = !hcp->hcd.no_i2s_capture;
+	bool has_playback = !hcp->hcd.no_i2s_playback;
 	int ret = 0;
 
+	if (!((has_playback && tx) || (has_capture && !tx)))
+		return 0;
+
 	mutex_lock(&hcp->lock);
 	if (hcp->busy) {
 		dev_err(dai->dev, "Only one simultaneous stream supported!\n");
@@ -468,6 +473,12 @@ static void hdmi_codec_shutdown(struct snd_pcm_substream *substream,
 				struct snd_soc_dai *dai)
 {
 	struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
+	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+	bool has_capture = !hcp->hcd.no_i2s_capture;
+	bool has_playback = !hcp->hcd.no_i2s_playback;
+
+	if (!((has_playback && tx) || (has_capture && !tx)))
+		return;
 
 	hcp->chmap_idx = HDMI_CODEC_CHMAP_IDX_UNKNOWN;
 	hcp->hcd.ops->audio_shutdown(dai->dev->parent, hcp->hcd.data);
-- 
2.39.2