On Tue, 18 Jul 2023 10:45:15 +0200, 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.

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.

I suspect the avs and skylake drivers used snd_hdac_i915_init purely for the modprobe, but I don't have the hardware to test if it can be safely removed. It can still be done easily in a followup patch to simplify probing.

Thanks for the patches. I naively thought that issuing the component binding at the early stage could be problematic, but in this case, this doesn't look OK, since the all i915 stuff is bound always at the HD-audio controller level, not at the codec level like others.

So, it's definitely worth to try.

Takashi

Maarten Lankhorst (7): 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. ASoC: Intel: Skylake: Move snd_hdac_i915_init to before probe_work. ALSA: hda/intel: Move snd_hdac_i915_init to before probe_work. ASoC: SOF: Intel: Remove deferred probe for SOF ALSA: hda/i915: Remove extra argument from snd_hdac_i915_init

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

sound/hda/hdac_i915.c | 15 +++------ sound/pci/hda/hda_intel.c | 58 +++++++++++++++++++---------------- sound/soc/intel/avs/core.c | 13 +++++--- sound/soc/intel/skylake/skl.c | 31 ++++++------------- sound/soc/sof/Kconfig | 19 ------------ sound/soc/sof/core.c | 38 ++--------------------- sound/soc/sof/intel/Kconfig | 1 - sound/soc/sof/intel/hda.c | 32 +++++++++++-------- sound/soc/sof/sof-pci-dev.c | 3 +- sound/soc/sof/sof-priv.h | 5 --- 10 files changed, 75 insertions(+), 140 deletions(-)

-- 2.39.2