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

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Date:   Thu, 5 Oct 2023 13:26:18 +0200
From:   Maarten Lankhorst <dev@...khorst.se>
To:     Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc:     Alsa-devel <alsa-devel@...a-project.org>,
        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 2023-10-05 12:58, Péter Ujfalusi wrote:
> 
> 
> 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.
There's dev_err_probe, which is dev_err on error, or sets the reason for 
deferred probe to the arguments if the error is -EPROBE_DEFER.

~Maarten