linux-kernel - Re: [PATCH v6 11/12] ASoC: SOF: Intel: Move binding to display driver outside of deferred probe

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Message-ID: <b4a010aa-b547-42ad-844f-849f287abd54@linux.intel.com>
Date:   Thu, 5 Oct 2023 13:58:26 +0300
From:   Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>
To:     Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc:     Alsa-devel <alsa-devel@...a-project.org>,
        Maarten Lankhorst <dev@...khorst.se>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...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 v6 11/12] ASoC: SOF: Intel: Move binding to display driver
 outside of deferred probe



On 04/10/2023 19:59, Kai Vehmanen wrote:
> Hi,
> 
> I'm good with rest of the series, but one patch requires work.
> 
> On Wed, 4 Oct 2023, 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.
>>
>> The previously added probe_early can be used for this,
>> and we also use the newly added remove_late for unbinding afterwards.
> [...]
>> --- a/sound/soc/sof/intel/hda-common-ops.c
>> +++ b/sound/soc/sof/intel/hda-common-ops.c
>> @@ -19,6 +19,7 @@ struct snd_sof_dsp_ops sof_hda_common_ops = {
>>  	.probe_early	= hda_dsp_probe_early,
>>  	.probe		= hda_dsp_probe,
>>  	.remove		= hda_dsp_remove,
>> +	.remove_late	= hda_dsp_remove_late,
>>  
>>  	/* Register IO uses direct mmio */
>>  
>> diff --git a/sound/soc/sof/intel/hda.c b/sound/soc/sof/intel/hda.c
>> index 86a2571488bc..4eb7f04b8ae1 100644
>> --- a/sound/soc/sof/intel/hda.c
>> +++ b/sound/soc/sof/intel/hda.c
>> @@ -1160,6 +1160,7 @@ int hda_dsp_probe_early(struct snd_sof_dev *sdev)
>>  		return -ENOMEM;
>>  	sdev->pdata->hw_pdata = hdev;
>>  	hdev->desc = chip;
>> +	ret = hda_init(sdev);
>>  
>>  err:
>>  	return ret;
> 
> I don't think this works. The hda_codec_i915_init() errors are ignored in 
> hda_init() so this never returns -EPROBE_DEFER.
> 
> So something like this is needed on top (tested quickly on one SOF 
> machine and this blocks SOF load until i915 or xe driver is loaded):
> 
> --cut--
> diff --git a/sound/soc/sof/intel/hda.c b/sound/soc/sof/intel/hda.c
> index 9025bfaf6a7e..8b17c82dcc89 100644
> --- a/sound/soc/sof/intel/hda.c
> +++ b/sound/soc/sof/intel/hda.c
> @@ -863,13 +863,20 @@ static int hda_init(struct snd_sof_dev *sdev)
>         /* init i915 and HDMI codecs */
>         ret = hda_codec_i915_init(sdev);
>         if (ret < 0)
> -               dev_warn(sdev->dev, "init of i915 and HDMI codec 
> failed\n");
> +               dev_warn(sdev->dev, "init of i915 and HDMI codec failed 
> (%d)\n", ret);

we should not print anything or maximum dev_dbg in case of EPROBE_DEFER.

> +
> +       if (ret < 0 && ret != -ENODEV)
> +               goto out;
>  
>         /* get controller capabilities */
>         ret = hda_dsp_ctrl_get_caps(sdev);
>         if (ret < 0)
>                 dev_err(sdev->dev, "error: get caps error\n");
>  
> +out:
> +       if (ret < 0)
> +               iounmap(sof_to_bus(sdev)->remap_addr);
> +
>         return ret;
>  }
> --cut--
> 
> Br, Kai

-- 
Péter