linux-kernel - Re: [PATCH v3 8/9] ASoC: SOF: Intel: Move binding to display driver outside of deferred probe

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Message-ID: <4acc7318-69b3-3eb5-1fe8-f7deea8adfad@linux.intel.com>
Date:   Mon, 7 Aug 2023 09:26:53 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        alsa-devel@...a-project.org
Cc:     Maarten Lankhorst <dev@...khorst.se>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Daniel Baluta <daniel.baluta@....com>,
        linux-kernel@...r.kernel.org, sound-open-firmware@...a-project.org
Subject: Re: [PATCH v3 8/9] ASoC: SOF: Intel: Move binding to display driver
 outside of deferred probe



On 8/7/23 04:00, Maarten Lankhorst wrote:
> Now that we can use -EPROBE_DEFER, it's no longer required to spin off
> the snd_hdac_i915_init into a workqueue.
> 
> Use the -EPROBE_DEFER mechanism instead, which must be returned in the
> probe function.

I don't think this patch is aligned with the previous discussions. What
we agreed on is that snd_hdac_i915_init() would be called from and not
from the workqueue.

But this patch also moves all codec initialization out of the workqueue.

I think we need two callbacks for device-specific initilization, one
that is called from the probe function and one from the workqueue,
otherwise we'll have a structure that differs from the snd-hda-intel -
which would be rather silly in terms of support/debug.

I realize there's quite a bit of surgery involved, and most likely the
SOF folks should provide this patch for you to build on.

> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
> ---
>  sound/soc/sof/core.c            | 19 +++++++------------
>  sound/soc/sof/intel/hda-codec.c |  2 +-
>  2 files changed, 8 insertions(+), 13 deletions(-)
> 
> diff --git a/sound/soc/sof/core.c b/sound/soc/sof/core.c
> index 30db685cc5f4..cd4d06d1800b 100644
> --- a/sound/soc/sof/core.c
> +++ b/sound/soc/sof/core.c
> @@ -188,13 +188,6 @@ static int sof_probe_continue(struct snd_sof_dev *sdev)
>  	struct snd_sof_pdata *plat_data = sdev->pdata;
>  	int ret;
>  
> -	/* probe the DSP hardware */
> -	ret = snd_sof_probe(sdev);
> -	if (ret < 0) {
> -		dev_err(sdev->dev, "error: failed to probe DSP %d\n", ret);
> -		goto probe_err;
> -	}
> -
>  	sof_set_fw_state(sdev, SOF_FW_BOOT_PREPARE);
>  
>  	/* check machine info */
> @@ -325,10 +318,6 @@ static int sof_probe_continue(struct snd_sof_dev *sdev)
>  dbg_err:
>  	snd_sof_free_debug(sdev);
>  dsp_err:
> -	snd_sof_remove(sdev);
> -probe_err:
> -	sof_ops_free(sdev);
> -
>  	/* all resources freed, update state to match */
>  	sof_set_fw_state(sdev, SOF_FW_BOOT_NOT_STARTED);
>  	sdev->first_boot = true;
> @@ -436,6 +425,12 @@ int snd_sof_device_probe(struct device *dev, struct snd_sof_pdata *plat_data)
>  
>  	sof_set_fw_state(sdev, SOF_FW_BOOT_NOT_STARTED);
>  
> +	ret = snd_sof_probe(sdev);
> +	if (ret) {
> +		dev_err_probe(sdev->dev, ret, "failed to probe DSP\n");
> +		return ret;
> +	}
> +
>  	if (IS_ENABLED(CONFIG_SND_SOC_SOF_PROBE_WORK_QUEUE)) {
>  		INIT_WORK(&sdev->probe_work, sof_probe_work);
>  		schedule_work(&sdev->probe_work);
> @@ -485,9 +480,9 @@ int snd_sof_device_remove(struct device *dev)
>  
>  		snd_sof_ipc_free(sdev);
>  		snd_sof_free_debug(sdev);
> -		snd_sof_remove(sdev);
>  	}
>  
> +	snd_sof_remove(sdev);
>  	sof_ops_free(sdev);
>  
>  	/* release firmware */
> diff --git a/sound/soc/sof/intel/hda-codec.c b/sound/soc/sof/intel/hda-codec.c
> index f1fd5b44aaac..344b61576c0e 100644
> --- a/sound/soc/sof/intel/hda-codec.c
> +++ b/sound/soc/sof/intel/hda-codec.c
> @@ -415,7 +415,7 @@ int hda_codec_i915_init(struct snd_sof_dev *sdev)
>  		return 0;
>  
>  	/* i915 exposes a HDA codec for HDMI audio */
> -	ret = snd_hdac_i915_init(bus, true);
> +	ret = snd_hdac_i915_init(bus, false);
>  	if (ret < 0)
>  		return ret;
>