linux-kernel - Re: [PATCH v2 4/9] ALSA: hda/i915: Allow xe as match for i915_component_master

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Message-ID: <518bb7a9-3a85-2c13-68bf-63baaff176ef@linux.intel.com>
Date:   Mon, 24 Jul 2023 12:28:29 +0200
From:   Pierre-Louis Bossart <pierre-louis.bossart@...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>,
        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 4/9] ALSA: hda/i915: Allow xe as match for
 i915_component_master_match



On 7/19/23 18:41, Maarten Lankhorst wrote:
> xe is a new driver for intel GPU's that shares the sound related code
> with i915.
> 
> Don't allow it to be modprobed though; the module is not upstream yet
> and we should exclusively use the EPROBE_DEFER mechanism.

I can't figure out what this comment means.

how would the -EPROBE_DEFER mechanism help if the driver that will
trigger a new probe is not upstream?

Not following at all what you intended to explain.

> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
> ---
>  sound/hda/hdac_i915.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c
> index 961fcd3397f40..12c1f8d93499f 100644
> --- a/sound/hda/hdac_i915.c
> +++ b/sound/hda/hdac_i915.c
> @@ -115,7 +115,8 @@ static int i915_component_master_match(struct device *dev, int subcomponent,
>  	hdac_pci = to_pci_dev(bus->dev);
>  	i915_pci = to_pci_dev(dev);
>  
> -	if (!strcmp(dev->driver->name, "i915") &&
> +	if ((!strcmp(dev->driver->name, "i915") ||
> +		 !strcmp(dev->driver->name, "xe")) &&
>  	    subcomponent == I915_COMPONENT_AUDIO &&
>  	    connectivity_check(i915_pci, hdac_pci))
>  		return 1;