[v5,00/12] sound: Use -EPROBE_DEFER instead of i915 module loading.

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.

The conversion is done in gradual steps. First I add an argument to
snd_hdac_i915_init to allow for -EPROBE_DEFER so I can convert each driver
separately. Then I convert each driver to move snd_hdac_i915_init out of the
workqueue. Finally I drop the ability to choose modprobe behavior after the
last user is converted.

Compared to previous version, I added a fix for sof_ops_free() missing call,
renamed probe_no_wq and remove_no_wq to probe_early/probe_late, and fixed
the resulting fallout.

Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: Cezary Rojewski <cezary.rojewski@intel.com>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Cc: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Cc: Bard Liao <yung-chuan.liao@linux.intel.com>
Cc: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Cc: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Daniel Baluta <daniel.baluta@nxp.com>
Cc: alsa-devel@alsa-project.org
Cc: linux-kernel@vger.kernel.org
Cc: sound-open-firmware@alsa-project.org

Maarten Lankhorst (10):
  ASoC/SOF/core: Ensure sof_ops_free() is still called when probe never
    ran.
  ALSA: hda/intel: Fix error handling in azx_probe()
  ALSA: hda/i915: Allow override of gpu binding.
  ALSA: hda/i915: Add an allow_modprobe argument to snd_hdac_i915_init
  ALSA: hda/i915: Allow xe as match for i915_component_master_match
  ASoC: Intel: avs: Move snd_hdac_i915_init to before probe_work.
  ALSA: hda/intel: Move snd_hdac_i915_init to before probe_work.
  ASoC: Intel: Skylake: Move snd_hdac_i915_init to before probe_work.
  ASoC: SOF: Intel: Move binding to display driver outside of deferred
    probe
  ALSA: hda/i915: Remove extra argument from snd_hdac_i915_init

Pierre-Louis Bossart (2):
  ASoC: SOF: core: Add probe_early and remove_late callbacks
  ASoC: SOF: Intel: hda: start splitting the probe

 sound/hda/hdac_i915.c                | 24 ++++++-----
 sound/pci/hda/hda_intel.c            | 60 ++++++++++++++--------------
 sound/soc/intel/avs/core.c           | 13 ++++--
 sound/soc/intel/skylake/skl.c        | 31 +++++---------
 sound/soc/sof/core.c                 | 17 +++++++-
 sound/soc/sof/intel/hda-common-ops.c |  2 +
 sound/soc/sof/intel/hda.c            | 30 +++++++++-----
 sound/soc/sof/intel/hda.h            |  2 +
 sound/soc/sof/ops.h                  | 16 ++++++++
 sound/soc/sof/sof-priv.h             |  2 +
 10 files changed, 119 insertions(+), 78 deletions(-)

On 10/2/2023 6:52 PM, 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. It's likely the whole workqueue
> can be destroyed, but I don't have the means to test this.
> 
> Removing the workqueue would simplify init even further, but is left
> as exercise for the reviewer.
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Acked-by: Mark Brown <broonie@kernel.org>
> Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
> Reviewed-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
> ---

Isn't the convention that your Signed-off should be last when you are 
sending the patches? Or does it only apply to Signed-off lines 
themselves and other lines can be anywhere?

On 10/3/2023 8:55 AM, Amadeusz Sławiński wrote:
> On 10/2/2023 6:52 PM, 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. It's likely the whole workqueue
>> can be destroyed, but I don't have the means to test this.
>>
>> Removing the workqueue would simplify init even further, but is left
>> as exercise for the reviewer.
>>
>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
>> Acked-by: Mark Brown <broonie@kernel.org>
>> Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
>> Reviewed-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
>> ---
> 
> Isn't the convention that your Signed-off should be last when you are 
> sending the patches? Or does it only apply to Signed-off lines 
> themselves and other lines can be anywhere?
> 
And rereading kernel documentation, it really seems to be a bit 
ambiguous, well ignore the comment then.