linux-kernel - Re: [PATCH v2 0/9] sound: Use -EPROBE_DEFER instead of i915 module loading.

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Message-ID: <alpine.DEB.2.22.394.2307211300270.3532114@eliteleevi.tm.intel.com>
Date:   Fri, 21 Jul 2023 13:06:21 +0300 (EEST)
From:   Kai Vehmanen <kai.vehmanen@...ux.intel.com>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
cc:     Alsa-devel <alsa-devel@...a-project.org>,
        sound-open-firmware@...a-project.org, linux-kernel@...r.kernel.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>,
        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>
Subject: Re: [PATCH v2 0/9] sound: Use -EPROBE_DEFER instead of i915 module
 loading.

Hi,

On Wed, 19 Jul 2023, Maarten Lankhorst wrote:

> Explicitly loading i915 becomes a problem when upstreaming the new intel driver
> for Tiger Lake and higher graphics (xe). By loading i915, it doesn't wait for
> driver load of xe, and will fail completely before it loads.
> 
> -EPROBE_DEFER has to be returned before any device is created in probe(),
> otherwise the removal of the device will cause EPROBE_DEFER to try again
> in an infinite loop.

thanks, series looks good to me now. We'll need to adopt the new gpu_bind
parameter in a number of CI systems (where we test without i915/xe), but 
this looks perfectly doable.
  
I'll give my 

Reviewed-by: Kai Vehmanen <kai.vehmanen@...ux.intel.com>

... for the hdac_i915.c changes. For AVS and SOF, I'd ask for some 
more review time to allow Cezary, Pierre et al to weigh in. I don't
personally recall e.g. where we've used CONFIG_SOF_FORCE_PROBE_WORKQUEUE
and do we have grounds to keep it even if workqueue is no longer set
for HDA codec support.

Br, Kai