linux-kernel - Re: [REGRESSION] Missing bcm5974 touchpad on Macbooks

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Date: Mon, 4 Mar 2024 12:26:48 +0100
From: Javier Carrasco <javier.carrasco@...fvision.net>
To: Takashi Iwai <tiwai@...e.de>,
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>, linux-input@...r.kernel.org,
 linux-kernel@...r.kernel.org, regressions@...ts.linux.dev
Subject: Re: [REGRESSION] Missing bcm5974 touchpad on Macbooks

On 04.03.24 09:35, Takashi Iwai wrote:
> Hi,
> 
> we've received a few regression reports for openSUSE Leap about the
> missing touchpad on Macbooks.  After debugging, this turned out to be
> the backport of the commit 2b9c3eb32a699acdd4784d6b93743271b4970899
>     Input: bcm5974 - check endpoint type before starting traffic
> 
> And, the same regression was confirmed on the upstream 6.8-rc6
> kernel.
> 
> Reverting the commit above fixes the problem, the touchpad reappears.
> 
> The detailed hardware info is found at:
>   https://bugzilla.suse.com/show_bug.cgi?id=1220030
> 
> Feel free to join the bugzilla above, or let me know if you need
> something for debugging, then I'll delegate on the bugzilla.
> 
> 
> thanks,
> 
> Takashi
> 

Hi Takashi,

The commit adds a check to ensure that the endpoint type is interrupt.

According to that report, the issue arose with a MacBook Pro 5.1 (no
button, only trackpad endpoint), so the check on the tp_ep address
(0x81) returns false. I assume that you see an error message
("Unexpected non-int endpoint) and  the probe function fails returning
-ENODEV.

Do you see any warning in the logs when you revert the commit? It was
added to prevent using wrong endpoint types, which will display the
following warning: "BOGUS urb xfer, pipe "some_number" != type
"another_number""

I am just wondering if for some reason the check on interrupt type is
wrong here.


Best regards,
Javier Carrasco