From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org
To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [Bug 75985] [NVC1] HDMI audio device only visible after rescan
Date: Wed, 03 Jan 2018 20:20:31 +0000 [thread overview]
Message-ID: <bug-75985-8800-BE2AJb5evq@http.bugs.freedesktop.org/> (raw)
In-Reply-To: <bug-75985-8800-V0hAGp6uBxMKqLRl/0Ahz6D7qz1kEfGD2LY78lusg7I@public.gmane.org/>
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https://bugs.freedesktop.org/show_bug.cgi?id=75985
--- Comment #29 from Karol Herbst <karolherbst-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
(In reply to Daniel Drake from comment #22)
> Created attachment 136369 [details] [review]
> GP104: enable HDMI audio device function
>
> On Asus GL502VS I investigated why the gfx device must be removed before
> rescan in the above workarounds.
>
> The reason is that when Linux first probes the device (before you attempt
> the workaround), pci_setup_device() notes that the device is not
> multifunction capable. This causes pci_scan_slot() to not bother scanning
> the non-zero functions (per the behaviour inside next_fn()).
>
> I checked and I found that when the 0x488 magic bit is not set, the gfx
> device advertises as non-multifunction. After the bit is set, the device
> advertises as multi-function. So, after setting the magic bit, removing the
> device will cause Linux to re-probe it during the next rescan, taking note
> at that point that it is a multi-function device, and proceeding to scan the
> functions, finding the audio device at function 1.
>
> Based on that I have a first attempt at a fix. It's not working though,
> audio output is silent (but I did have it working with the previous
> workarounds). I'll look closer next week.
I think this check against 0x134 can be something like < 0x82 instead. This
thing is there since like G82 GPUs and I am sure the HDMI audio device is
controlled like this on all those GPUs.
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next prev parent reply other threads:[~2018-01-03 20:20 UTC|newest]
Thread overview: 123+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-10 15:56 [Bug 75985] New: HDMI audio device only visible after rescan bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
[not found] ` <bug-75985-8800-V0hAGp6uBxMKqLRl/0Ahz6D7qz1kEfGD2LY78lusg7I@public.gmane.org/>
2014-03-10 16:00 ` [Bug 75985] [NVC1] " bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2014-03-10 16:15 ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2014-03-10 23:14 ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
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