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

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Date:   Mon, 09 Oct 2023 08:23:15 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Maarten Lankhorst <dev@...khorst.se>
Cc:     Péter Ujfalusi 
        <peter.ujfalusi@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        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 Thu, 05 Oct 2023 13:26:18 +0200,
Maarten Lankhorst wrote:
> 
> 
> 
> 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.

I expect you'll respin v7 for addressing this?

I'd love to merge the series for 6.7, and the time ticks...


thanks,

Takashi