linux-kernel - Re: [PATCH v2 3/9] ALSA: hda/i915: Add an allow_modprobe argument to snd_hdac_i915

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Date:   Fri, 21 Jul 2023 14:32:54 +0300
From:   Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        alsa-devel@...a-project.org
Cc:     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>,
        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 3/9] ALSA: hda/i915: Add an allow_modprobe argument to
 snd_hdac_i915_init



On 19/07/2023 19:41, Maarten Lankhorst wrote:
> Xe is a new GPU driver that re-uses the display (and sound) code from
> i915. It's no longer possible to load i915, as the GPU can be driven
> by the xe driver instead.
> 
> The new behavior will return -EPROBE_DEFER, and wait for a compatible
> driver to be loaded instead of modprobing i915.
> 
> Converting all drivers at the same time is a lot of work, instead we
> will convert each user one by one.
> 
> Changes since v1:
> - Use dev_err_probe to set a probe reason for debugfs' deferred_devices.
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
> ---
>  include/sound/hda_i915.h        | 4 ++--
>  sound/hda/hdac_i915.c           | 8 ++++----
>  sound/pci/hda/hda_intel.c       | 2 +-
>  sound/soc/intel/avs/core.c      | 2 +-
>  sound/soc/intel/skylake/skl.c   | 2 +-
>  sound/soc/sof/intel/hda-codec.c | 2 +-
>  6 files changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c
> index c32709fa4115f..961fcd3397f40 100644
> --- a/sound/hda/hdac_i915.c
> +++ b/sound/hda/hdac_i915.c
> @@ -155,7 +155,7 @@ static int i915_gfx_present(struct pci_dev *hdac_pci)
>   *
>   * Returns zero for success or a negative error code.
>   */
> -int snd_hdac_i915_init(struct hdac_bus *bus)
> +int snd_hdac_i915_init(struct hdac_bus *bus, bool allow_modprobe)
>  {
>  	struct drm_audio_component *acomp;
>  	int err;
> @@ -171,7 +171,7 @@ int snd_hdac_i915_init(struct hdac_bus *bus)
>  	acomp = bus->audio_component;
>  	if (!acomp)
>  		return -ENODEV;
> -	if (!acomp->ops) {
> +	if (allow_modprobe && !acomp->ops) {
>  		if (!IS_ENABLED(CONFIG_MODULES) ||
>  		    !request_module("i915")) {
>  			/* 60s timeout */
> @@ -180,9 +180,9 @@ int snd_hdac_i915_init(struct hdac_bus *bus)
>  		}
>  	}
>  	if (!acomp->ops) {
> -		dev_info(bus->dev, "couldn't bind with audio component\n");
> +		int err = allow_modprobe ? -ENODEV : -EPROBE_DEFER;

Add one blank line here.

>  		snd_hdac_acomp_exit(bus);
> -		return -ENODEV;
> +		return dev_err_probe(bus->dev, err, "couldn't bind with audio component\n");
>  	}
>  	return 0;
>  }

-- 
Péter