linux-kernel - Re: [PATCH v3 2/9] ALSA: hda/i915: Allow override of gpu binding.

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Date:   Mon, 7 Aug 2023 09:06:42 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        alsa-devel@...a-project.org
Cc:     Maarten Lankhorst <dev@...khorst.se>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Cezary Rojewski <cezary.rojewski@...el.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>,
        linux-kernel@...r.kernel.org, sound-open-firmware@...a-project.org
Subject: Re: [PATCH v3 2/9] ALSA: hda/i915: Allow override of gpu binding.



On 8/7/23 04:00, Maarten Lankhorst wrote:
> Selecting CONFIG_DRM selects CONFIG_VIDEO_NOMODESET, which exports
> video_firmware_drivers_only(). This can be used as a first
> approximation on whether i915 will be available. It's safe to use as
> this is only built when CONFIG_SND_HDA_I915 is selected by CONFIG_I915.
> 
> It's not completely fool proof, as you can boot with "nomodeset
> i915.modeset=1" to make i915 load regardless, or use
> "i915.force_probe=!*" to never load i915, but the common case of
> booting with nomodeset to disable all GPU drivers this will work as
> intended.
> 
> Because of this, we add an extra module parameter,
> snd_hda_core.gpu_bind that can be used to signal users intent.
> -1 follows nomodeset, 0 disables binding, 1 forces wait/-EPROBE_DEFER
> on binding.
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
> Reviewed-by: Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>
> Reviewed-by: Kai Vehmanen <kai.vehmanen@...ux.intel.com>

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>