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ASoC: hdmi-codec: re-introduce mutex locking again

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The dai codec needs to ensure that on one dai is used at any time.
This is currently protected by bit atomic operation. With this change,
it done with a mutex instead.

This change is not about functionality or efficiency. It is done with
the hope that it help maintainability in the future.

Suggested-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20191206103542.485224-1-jbrunet@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jerome Brunet 2019-12-06 11:35:42 +01:00 committed by Mark Brown
parent bc9a665581
commit 1442842952
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 19 additions and 13 deletions
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30
sound/soc/codecs/hdmi-codec.c
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@ -274,7 +274,8 @@ struct hdmi_codec_priv {
uint8_t eld[MAX_ELD_BYTES];
struct snd_pcm_chmap *chmap_info;
unsigned int chmap_idx;
unsigned long busy;
struct mutex lock;
bool busy;
struct snd_soc_jack *jack;
unsigned int jack_status;
};
@ -390,9 +391,10 @@ static int hdmi_codec_startup(struct snd_pcm_substream *substream,
struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
int ret = 0;
ret = test_and_set_bit(0, &hcp->busy);
if (ret) {
mutex_lock(&hcp->lock);
if (hcp->busy) {
dev_err(dai->dev, "Only one simultaneous stream supported!\n");
mutex_unlock(&hcp->lock);
return -EINVAL;
}
@ -405,21 +407,21 @@ static int hdmi_codec_startup(struct snd_pcm_substream *substream,
if (hcp->hcd.ops->get_eld) {
ret = hcp->hcd.ops->get_eld(dai->dev->parent, hcp->hcd.data,
hcp->eld, sizeof(hcp->eld));
if (!ret) {
ret = snd_pcm_hw_constraint_eld(substream->runtime,
hcp->eld);
if (ret)
goto err;
}
ret = snd_pcm_hw_constraint_eld(substream->runtime, hcp->eld);
if (ret)
goto err;
/* Select chmap supported */
hdmi_codec_eld_chmap(hcp);
}
return 0;
hcp->busy = true;
err:
/* Release the exclusive lock on error */
clear_bit(0, &hcp->busy);
mutex_unlock(&hcp->lock);
return ret;
}
@ -431,7 +433,9 @@ static void hdmi_codec_shutdown(struct snd_pcm_substream *substream,
hcp->chmap_idx = HDMI_CODEC_CHMAP_IDX_UNKNOWN;
hcp->hcd.ops->audio_shutdown(dai->dev->parent, hcp->hcd.data);
clear_bit(0, &hcp->busy);
mutex_lock(&hcp->lock);
hcp->busy = false;
mutex_unlock(&hcp->lock);
}
static int hdmi_codec_hw_params(struct snd_pcm_substream *substream,
@ -811,6 +815,8 @@ static int hdmi_codec_probe(struct platform_device *pdev)
return -ENOMEM;
hcp->hcd = *hcd;
mutex_init(&hcp->lock);
daidrv = devm_kcalloc(dev, dai_count, sizeof(*daidrv), GFP_KERNEL);
if (!daidrv)
return -ENOMEM;