| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Thu, 21 Oct 2021 18:52:28 +0900
From: Tsuchiya Yuto <kitakar@...il.com>
To: Hans de Goede <hdegoede@...hat.com>
Cc: Patrik Gfeller <patrik.gfeller@...il.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
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
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 can't (easily) try touchscreen on mipad2 because it won't boot without
nomodeset and somehow GNOME won't start if it's using nomodeset (on Arch
Linux).
On Mon, 2021-10-18 at 10:30 +0200, Hans de Goede wrote:
> Hi,
>
> On 10/17/21 18:23, Tsuchiya Yuto wrote:
> > Touchscreen input works fine before loading atomisp driver on Surface 3.
> >
> > However, after loading atomisp driver, touchscreen works only when
> > capturing images. This sounds like atomisp turns off something needed
> > for touchscreen when atomisp is idle.
> >
> > There is no useful kernel log. Just the touchscreen stops working
> > with no log.
> >
> > I'll update if I find something further. First of all, can someone
> > reproduce this issue on the other devices?
>
> My first bet would be some regulator getting turned off.
>
> What you can do is:
>
> 1. ls -l /dev/bus/i2c/devices
>
> And then write down the number of the i2c-bus to which the
> CRC PMIC is connected, lets say it is number "4". Then:
>
> 2. Before loading the atomisp drivers run:
> "sudo i2cdump -y -f 4 0x6e > crc-regs-good"
>
> 3. After loading the atomisp drivers run:
> "sudo i2cdump -y -f 4 0x6e > crc-regs-bad
>
> 4. "diff -u crc-regs-good crc-regs-bad"
>
> And see what changed.
Here is the diff. The "good" one is before loading sensor driver, the
"bad" one is from after loading sensor driver:
$ diff -u crc-regs-good crc-regs-bad
--- crc-regs-good 2021-10-21 18:04:57.853396866 +0900
+++ crc-regs-bad 2021-10-21 18:06:13.755738054 +0900
@@ -4,14 +4,14 @@
20: 00 00 01 c8 68 07 0a 10 10 01 1f 10 10 10 10 10 ..??h???????????
30: 10 10 00 20 21 20 20 20 20 20 00 2a 1c 1c 14 10 ??. ! .*????
40: 10 10 10 28 20 20 28 2e 2f 20 20 83 00 00 4c 00 ???( (./ ?..L.
-50: 00 01 01 01 00 00 60 00 60 00 00 02 02 03 60 60 .???..`.`..???``
+50: 00 01 01 01 00 00 60 02 60 00 00 02 02 62 60 60 .???..`?`..??b``
60: 60 01 03 00 00 00 00 00 00 00 30 04 00 00 00 00 `??.......0?....
-70: 00 03 00 00 02 7b 02 6c 02 71 02 55 02 7c 02 9d .?..?{?l?q?U?|??
+70: 00 03 00 00 02 7b 02 6d 02 73 02 58 02 7f 02 9e .?..?{?m?s?X????
80: 00 00 00 00 00 00 00 00 00 00 00 02 08 00 0b 02 ...........??.??
90: 3f 07 00 00 00 00 4c 00 4e 00 00 4c 00 23 01 b4 ??....L.N..L.#??
a0: 4c 00 4e 00 00 3d ca 6a f0 00 00 3d ca 6a f0 00 L.N..=?j?..=?j?.
b0: 00 7e 2a ff 02 04 06 00 00 00 00 00 00 20 00 00 .~*.???...... ..
c0: 00 00 00 cd 08 00 00 4c 00 00 00 4c 00 00 00 3d ...??..L...L...=
-d0: 97 00 00 3d 97 00 00 fe 17 00 ff 02 01 07 94 03 ?..=?..??..?????
-e0: 9a 00 27 00 00 00 00 00 00 00 00 00 00 00 00 00 ?.'.............
+d0: 97 00 00 3d 97 00 00 fe 17 00 ff 02 01 07 ec 03 ?..=?..??..?????
+e0: 96 00 21 00 00 00 00 00 00 00 00 00 00 00 00 00 ?.!.............
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Note that lines "70:" and "d0:"/"e0:" change over time. So, the actual
change caused by loading sensor driver is line "50:"
-50: 00 01 01 01 00 00 60 00 60 00 00 02 02 03 60 60 .???..`.`..???``
+50: 00 01 01 01 00 00 60 02 60 00 00 02 02 62 60 60 .???..`?`..??b``
and in atomisp_gmin_platform.c file,
/* CRYSTAL COVE PMIC register set */
#define CRYSTAL_1P8V_REG 0x57
#define CRYSTAL_2P8V_REG 0x5d
#define CRYSTAL_ON 0x63
#define CRYSTAL_OFF 0x62
indeed we're poking at 0x57 and 0x5d. So, maybe this issue is caused by
regulators? I tried what would happen if I kept sensor power on before
in sensor drivers, but there was no effect. But I feel I need to look
into it again further.
> There are 2 possible root causes here:
>
> 1. Some regulator is shared between the cameras and
> touchscreen
>
> 2. The crc code in atomisp which you are using is
> poking registers assuming the Bay Trail version of
> the Crystal Cove PMIC (aka CRC PMIC) but your
> Surface 3 has the Cherry Trail version and we know
> that the regulators are add different register
> addresses there, see the comment in:
> drivers/acpi/pmic/intel_pmic_chtcrc.c
> so it is possible that the atomisp code is simply
> poking the wrong register for one of the regulators
According to this Android kernel commit [1], the address for 1P8V and
2P8V are updated to the CRC+ ones (the upstreamed atomisp already has
this change)
[1] https://github.com/MiCode/Xiaomi_Kernel_OpenSource/commit/2f8221ba9a3770aed1ecfad2d04db61b95f30394
("update PMIC v1p8/v2p8 address")
> I also wonder if this goes away if you do the
>
> hrv = 0x03;
>
> Hack inside drivers/mfd/intel_soc_pmic_core.c ?
>
> Without that we end up using the wrong PMIC
> OpRegion driver which also uses the wrong
> regulator addresses.
I'm now using cht one with your patch, but the situation is the same
as before.
Regards,
Tsuchiya Yuto
> Regards,
>
> Hans
>
>
> p.s.
>
> Here are the 2 different regulator drivers the
> comment in drivers/acpi/pmic/intel_pmic_chtcrc.c
> refers to:
>
> https://github.com/Zenfone2-Dev/android_kernel_asus_moorefield-1/blob/stock/drivers/regulator/pmic_crystal_cove.c
> https://github.com/Zenfone2-Dev/android_kernel_asus_moorefield-1/blob/stock/drivers/regulator/pmic_crystal_cove_plus.c
>
Powered by blists - more mailing lists