linux-kernel - Re: [BUG 5/5] [BUG] media: atomisp: atomisp causes touchscreen to stop working on Microsoft Surface 3

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Message-ID: <20211108074101.033af4c5@sal.lan>
Date:   Mon, 8 Nov 2021 07:41:01 +0000
From:   Mauro Carvalho Chehab <mchehab@...nel.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Tsuchiya Yuto <kitakar@...il.com>,
        Patrik Gfeller <patrik.gfeller@...il.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Kaixu Xia <kaixuxia@...cent.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Arnd Bergmann <arnd@...db.de>, linux-media@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [BUG 5/5] [BUG] media: atomisp: atomisp causes touchscreen to
 stop working on Microsoft Surface 3

Em Mon, 8 Nov 2021 00:39:38 +0100
Hans de Goede <hdegoede@...hat.com> escreveu:

> Hi,
> 
> On 10/21/21 11:52, Tsuchiya Yuto wrote:
> > Thank you for your comment :-)
> > 
> > First, I need to correct what I said in the previous mail. I later found
> > that loading only "atomisp" (as well as its dependency,
> > atomisp_gmin_platform) does not cause this issue.
> > 
> > What causes this issue is rather, loading sensor drivers (as well as its
> > dependency, atomisp_gmin_platform).
> > 
> > These sensor drivers for surface3 are both not upstream, but I made them
> > as similar as possible to the upstreamed ones. So, I guess this issue
> > can still be reproducible on some other devices.  
> 
> I've run some test on my own surface3 and the problem is the writing
> of 0x62 (which becomes just 0x02) to the 0x57 register of the PMIC,
> writing 0x00 to that after loading the sensor driver makes things work
> again.
> 
> I have not had time to investigate this further.
> 
> I used media-staging + your sensor drivers from:
> https://github.com/kitakar5525/surface3-atomisp-cameras.git
> 
> Which was enough to figure this out, but I've not actually gotten
> either of the cameras working :|  I get:
> 
> [user@...ora nvt]$ ./atomisp-test.sh 
> p0: OPEN video device `/dev/video2'

After the patch that moved the output preview to be the first one,
you should probably use /dev/video0 here:


$ v4l2-ctl -D -d /dev/video0|grep Name
	Name             : ATOMISP ISP PREVIEW output

$ v4l2-ctl -D -d /dev/video2|grep Name
	Name             : ATOMISP ISP VIEWFINDER output


On Asus T101HA, I'm also getting this if I use /dev/video2 with nvt:

	ioctl(3, _IOC(_IOC_WRITE, 0x76, 0xe0, 0x1f0), 0x7ffcf08fe030) = -1 EINVAL (Argumento inválido)
	p0: ./v4l2n: ATOMISP_IOC_S_PARAMETERS failed on fd 3: Invalid argument (22)
	p0: CLOSED video device

Regards,
Mauro