diff options
| author | Tzung-Bi Shih <tzungbi@google.com> | 2019-07-08 22:19:01 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-07-10 16:24:39 +0100 |
| commit | 6cd249cfad68a231336983e2216d75b3ddfde1d6 (patch) | |
| tree | 89de6c97e833de61087ffb970cb3a2a5bb8e57ca /sound | |
| parent | 87a6fe80d56be85bda093c4dd8a3e6535bda7e4a (diff) | |
| download | linux-6cd249cfad68a231336983e2216d75b3ddfde1d6.tar.bz2 | |
ASoC: max98357a: use mdelay for sdmode-delay
max98357a_daiops_trigger() is possible to be called in atomic context if
the .nonatomic flag is equal to 0 in the DAI links.
When cancel_delayed_work_sync() in max98357a_daiops_trigger() is called
in atomic context, kernel emits the following message: "BUG: sleeping
function called from invalid context".
According to the DT binding document, value less than or equal to 5ms of
sdmod-delay should be sufficient to avoid the pop noise. Use mdelay
(i.e. busy loop) for such low delay should be acceptable.
Fixes: cec5b01f8f1c ("ASoC: max98357a: avoid speaker pop when playback
startup")
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20190708141901.68797-1-tzungbi@google.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/codecs/max98357a.c | 25 |
1 files changed, 4 insertions, 21 deletions
diff --git a/sound/soc/codecs/max98357a.c b/sound/soc/codecs/max98357a.c index 6f0e28f903bf..16313b973eaa 100644 --- a/sound/soc/codecs/max98357a.c +++ b/sound/soc/codecs/max98357a.c @@ -20,20 +20,10 @@ #include <sound/soc-dapm.h> struct max98357a_priv { - struct delayed_work enable_sdmode_work; struct gpio_desc *sdmode; unsigned int sdmode_delay; }; -static void max98357a_enable_sdmode_work(struct work_struct *work) -{ - struct max98357a_priv *max98357a = - container_of(work, struct max98357a_priv, - enable_sdmode_work.work); - - gpiod_set_value(max98357a->sdmode, 1); -} - static int max98357a_daiops_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { @@ -46,14 +36,12 @@ static int max98357a_daiops_trigger(struct snd_pcm_substream *substream, case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: - queue_delayed_work(system_power_efficient_wq, - &max98357a->enable_sdmode_work, - msecs_to_jiffies(max98357a->sdmode_delay)); + mdelay(max98357a->sdmode_delay); + gpiod_set_value(max98357a->sdmode, 1); break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: - cancel_delayed_work_sync(&max98357a->enable_sdmode_work); gpiod_set_value(max98357a->sdmode, 0); break; } @@ -112,30 +100,25 @@ static int max98357a_platform_probe(struct platform_device *pdev) int ret; max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL); - if (!max98357a) return -ENOMEM; max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev, "sdmode", GPIOD_OUT_LOW); - if (IS_ERR(max98357a->sdmode)) return PTR_ERR(max98357a->sdmode); ret = device_property_read_u32(&pdev->dev, "sdmode-delay", &max98357a->sdmode_delay); - if (ret) { max98357a->sdmode_delay = 0; dev_dbg(&pdev->dev, - "no optional property 'sdmode-delay' found, default: no delay\n"); + "no optional property 'sdmode-delay' found, " + "default: no delay\n"); } dev_set_drvdata(&pdev->dev, max98357a); - INIT_DELAYED_WORK(&max98357a->enable_sdmode_work, - max98357a_enable_sdmode_work); - return devm_snd_soc_register_component(&pdev->dev, &max98357a_component_driver, &max98357a_dai_driver, 1); |