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ASoC: dapm: handle probe deferrals
This starts to handle probe deferrals on regulators and clocks on the ASoC DAPM. I came to this patch after audio stopped working on Ux500 ages ago and I finally looked into it to see what is wrong. I had messages like this in the console since a while back: ab8500-codec.0: ASoC: Failed to request audioclk: -517 ab8500-codec.0: ASoC: Failed to create DAPM control audioclk ab8500-codec.0: Failed to create new controls -12 snd-soc-mop500.0: ASoC: failed to instantiate card -12 snd-soc-mop500.0: Error: snd_soc_register_card failed (-12)! snd-soc-mop500: probe of snd-soc-mop500.0 failed with error -12 Apparently because the widget table for the codec looks like this (sound/soc/codecs/ab8500-codec.c): static const struct snd_soc_dapm_widget ab8500_dapm_widgets[] = { /* Clocks */ SND_SOC_DAPM_CLOCK_SUPPLY("audioclk"), /* Regulators */ SND_SOC_DAPM_REGULATOR_SUPPLY("V-AUD", 0, 0), SND_SOC_DAPM_REGULATOR_SUPPLY("V-AMIC1", 0, 0), SND_SOC_DAPM_REGULATOR_SUPPLY("V-AMIC2", 0, 0), SND_SOC_DAPM_REGULATOR_SUPPLY("V-DMIC", 0, 0), So when we call snd_soc_register_codec() and any of these widgets get a deferred probe we do not get an -EPROBE_DEFER (-517) back as we should and instead we just fail. Apparently the code assumes that clocks and regulators must be available at this point and not defer. After this patch it rather looks like this: ab8500-codec.0: Failed to create new controls -517 snd-soc-mop500.0: ASoC: failed to instantiate card -517 snd-soc-mop500.0: Error: snd_soc_register_card failed (-517)! (...) abx500-clk.0: registered clocks for ab850x snd-soc-mop500.0: ab8500-codec-dai.0 <-> ux500-msp-i2s.1 mapping ok snd-soc-mop500.0: ab8500-codec-dai.1 <-> ux500-msp-i2s.3 mapping ok I'm pretty happy about the patch as it it, but I'm a bit uncertain on how to proceed: there are a lot of users of the external functions snd_soc_dapm_new_control() (111 sites) and that will now return an occassional error pointer, which is not handled in the calling sites. I want an indication from the maintainers whether I should just go in and augment all these call sites, or if deferred probe is frowned upon when it leads to this much overhead. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -363,6 +363,10 @@ static int dapm_kcontrol_data_alloc(struct snd_soc_dapm_widget *widget,
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snd_soc_dapm_new_control_unlocked(widget->dapm,
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&template);
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kfree(name);
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if (IS_ERR(data->widget)) {
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ret = PTR_ERR(data->widget);
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goto err_data;
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}
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if (!data->widget) {
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ret = -ENOMEM;
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goto err_data;
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@ -397,6 +401,10 @@ static int dapm_kcontrol_data_alloc(struct snd_soc_dapm_widget *widget,
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data->widget = snd_soc_dapm_new_control_unlocked(
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widget->dapm, &template);
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kfree(name);
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if (IS_ERR(data->widget)) {
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ret = PTR_ERR(data->widget);
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goto err_data;
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}
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if (!data->widget) {
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ret = -ENOMEM;
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goto err_data;
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@ -3403,11 +3411,22 @@ snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
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mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
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w = snd_soc_dapm_new_control_unlocked(dapm, widget);
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/* Do not nag about probe deferrals */
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if (IS_ERR(w)) {
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int ret = PTR_ERR(w);
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if (ret != -EPROBE_DEFER)
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dev_err(dapm->dev,
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"ASoC: Failed to create DAPM control %s (%d)\n",
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widget->name, ret);
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goto out_unlock;
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}
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if (!w)
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dev_err(dapm->dev,
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"ASoC: Failed to create DAPM control %s\n",
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widget->name);
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out_unlock:
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mutex_unlock(&dapm->card->dapm_mutex);
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return w;
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}
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@ -3430,6 +3449,8 @@ snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
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w->regulator = devm_regulator_get(dapm->dev, w->name);
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if (IS_ERR(w->regulator)) {
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ret = PTR_ERR(w->regulator);
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if (ret == -EPROBE_DEFER)
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return ERR_PTR(ret);
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dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
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w->name, ret);
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return NULL;
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@ -3448,6 +3469,8 @@ snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
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w->clk = devm_clk_get(dapm->dev, w->name);
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if (IS_ERR(w->clk)) {
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ret = PTR_ERR(w->clk);
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if (ret == -EPROBE_DEFER)
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return ERR_PTR(ret);
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dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
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w->name, ret);
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return NULL;
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@ -3566,6 +3589,16 @@ int snd_soc_dapm_new_controls(struct snd_soc_dapm_context *dapm,
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mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
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for (i = 0; i < num; i++) {
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w = snd_soc_dapm_new_control_unlocked(dapm, widget);
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if (IS_ERR(w)) {
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ret = PTR_ERR(w);
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/* Do not nag about probe deferrals */
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if (ret == -EPROBE_DEFER)
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break;
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dev_err(dapm->dev,
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"ASoC: Failed to create DAPM control %s (%d)\n",
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widget->name, ret);
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break;
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}
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if (!w) {
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dev_err(dapm->dev,
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"ASoC: Failed to create DAPM control %s\n",
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@ -3842,6 +3875,15 @@ int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
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dev_dbg(card->dev, "ASoC: adding %s widget\n", link_name);
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w = snd_soc_dapm_new_control_unlocked(&card->dapm, &template);
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if (IS_ERR(w)) {
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ret = PTR_ERR(w);
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/* Do not nag about probe deferrals */
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if (ret != -EPROBE_DEFER)
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dev_err(card->dev,
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"ASoC: Failed to create %s widget (%d)\n",
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link_name, ret);
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goto outfree_kcontrol_news;
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}
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if (!w) {
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dev_err(card->dev, "ASoC: Failed to create %s widget\n",
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link_name);
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@ -1556,6 +1556,15 @@ static int soc_tplg_dapm_widget_create(struct soc_tplg *tplg,
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widget = snd_soc_dapm_new_control(dapm, &template);
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else
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widget = snd_soc_dapm_new_control_unlocked(dapm, &template);
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if (IS_ERR(widget)) {
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ret = PTR_ERR(widget);
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/* Do not nag about probe deferrals */
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if (ret != -EPROBE_DEFER)
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dev_err(tplg->dev,
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"ASoC: failed to create widget %s controls (%d)\n",
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w->name, ret);
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goto hdr_err;
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}
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if (widget == NULL) {
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dev_err(tplg->dev, "ASoC: failed to create widget %s controls\n",
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w->name);
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