[PATCHv1,00/19] Improve SBS battery support
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Message ID 20200513185615.508236-1-sebastian.reichel@collabora.com
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Sebastian Reichel May 13, 2020, 6:55 p.m. UTC
This patchset improves support for SBS compliant batteries. Due to
the changes, the battery now exposes 32 power supply properties and
(un)plugging it generates a backtrace containing the following message
without the first patch in this series:

---------------------------
WARNING: CPU: 0 PID: 20 at lib/kobject_uevent.c:659 add_uevent_var+0xd4/0x104
add_uevent_var: too many keys
---------------------------

For references this is what an SBS battery status looks like after
the patch series has been applied:

cat /sys/class/power_supply/sbs-0-000b/uevent 
POWER_SUPPLY_NAME=sbs-0-000b
POWER_SUPPLY_TYPE=Battery
POWER_SUPPLY_STATUS=Discharging
POWER_SUPPLY_CAPACITY_LEVEL=Normal
POWER_SUPPLY_HEALTH=Good
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_TECHNOLOGY=Li-ion
POWER_SUPPLY_CYCLE_COUNT=12
POWER_SUPPLY_VOLTAGE_NOW=11441000
POWER_SUPPLY_CURRENT_NOW=-26000
POWER_SUPPLY_CURRENT_AVG=-24000
POWER_SUPPLY_CAPACITY=76
POWER_SUPPLY_CAPACITY_ERROR_MARGIN=1
POWER_SUPPLY_TEMP=198
POWER_SUPPLY_TIME_TO_EMPTY_AVG=438600
POWER_SUPPLY_TIME_TO_FULL_AVG=3932100
POWER_SUPPLY_SERIAL_NUMBER=0000
POWER_SUPPLY_VOLTAGE_MIN_DESIGN=10800000
POWER_SUPPLY_VOLTAGE_MAX_DESIGN=10800000
POWER_SUPPLY_ENERGY_NOW=31090000
POWER_SUPPLY_ENERGY_FULL=42450000
POWER_SUPPLY_ENERGY_FULL_DESIGN=41040000
POWER_SUPPLY_CHARGE_NOW=2924000
POWER_SUPPLY_CHARGE_FULL=3898000
POWER_SUPPLY_CHARGE_FULL_DESIGN=3800000
POWER_SUPPLY_CONSTANT_CHARGE_CURRENT_MAX=3000000
POWER_SUPPLY_CONSTANT_CHARGE_VOLTAGE_MAX=12300000
POWER_SUPPLY_MANUFACTURE_YEAR=2017
POWER_SUPPLY_MANUFACTURE_MONTH=7
POWER_SUPPLY_MANUFACTURE_DAY=3
POWER_SUPPLY_MANUFACTURER=UR18650A
POWER_SUPPLY_MODEL_NAME=GEHC

-- Sebastian

Jean-Francois Dagenais (1):
  power: supply: sbs-battery: add ability to disable charger broadcasts

Sebastian Reichel (18):
  kobject: increase allowed number of uevent variables
  power: supply: core: add capacity error margin property
  power: supply: core: add manufacture date properties
  power: supply: core: add POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED
  power: supply: sbs-battery: Add TI BQ20Z65 support
  power: supply: sbs-battery: add
    POWER_SUPPLY_PROP_CAPACITY_ERROR_MARGIN support
  power: supply: sbs-battery: simplify read_read_string_data
  power: supply: sbs-battery: add PEC support
  power: supply: sbs-battery: add POWER_SUPPLY_PROP_CURRENT_AVG support
  power: supply: sbs-battery: Improve POWER_SUPPLY_PROP_TECHNOLOGY
    support
  power: supply: sbs-battery: add
    POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT/VOLTAGE_MAX support
  power: supply: sbs-battery: add MANUFACTURE_DATE support
  power: supply: sbs-battery: add
    POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED support
  power: supply: sbs-battery: fix idle battery status
  power: supply: sbs-battery: switch from of_property_* to
    device_property_*
  power: supply: sbs-battery: switch to i2c's probe_new
  power: supply: sbs-battery: constify power-supply property array
  dt-bindings: power: sbs-battery: Convert to yaml

 Documentation/ABI/testing/sysfs-class-power   |  45 ++-
 .../power/supply/sbs,sbs-battery.yaml         |  83 +++++
 .../bindings/power/supply/sbs_sbs-battery.txt |  27 --
 drivers/power/supply/power_supply_sysfs.c     |   5 +
 drivers/power/supply/sbs-battery.c            | 348 +++++++++++++-----
 include/linux/kobject.h                       |   2 +-
 include/linux/power_supply.h                  |   5 +
 7 files changed, 404 insertions(+), 111 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/power/supply/sbs,sbs-battery.yaml
 delete mode 100644 Documentation/devicetree/bindings/power/supply/sbs_sbs-battery.txt

Comments

Sebastian Reichel May 28, 2020, 10:44 p.m. UTC | #1
Hi,

I queued this series to power-supply's for-next branch.

-- Sebastian

On Wed, May 13, 2020 at 08:55:56PM +0200, Sebastian Reichel wrote:
> This patchset improves support for SBS compliant batteries. Due to
> the changes, the battery now exposes 32 power supply properties and
> (un)plugging it generates a backtrace containing the following message
> without the first patch in this series:
> 
> ---------------------------
> WARNING: CPU: 0 PID: 20 at lib/kobject_uevent.c:659 add_uevent_var+0xd4/0x104
> add_uevent_var: too many keys
> ---------------------------
> 
> For references this is what an SBS battery status looks like after
> the patch series has been applied:
> 
> cat /sys/class/power_supply/sbs-0-000b/uevent 
> POWER_SUPPLY_NAME=sbs-0-000b
> POWER_SUPPLY_TYPE=Battery
> POWER_SUPPLY_STATUS=Discharging
> POWER_SUPPLY_CAPACITY_LEVEL=Normal
> POWER_SUPPLY_HEALTH=Good
> POWER_SUPPLY_PRESENT=1
> POWER_SUPPLY_TECHNOLOGY=Li-ion
> POWER_SUPPLY_CYCLE_COUNT=12
> POWER_SUPPLY_VOLTAGE_NOW=11441000
> POWER_SUPPLY_CURRENT_NOW=-26000
> POWER_SUPPLY_CURRENT_AVG=-24000
> POWER_SUPPLY_CAPACITY=76
> POWER_SUPPLY_CAPACITY_ERROR_MARGIN=1
> POWER_SUPPLY_TEMP=198
> POWER_SUPPLY_TIME_TO_EMPTY_AVG=438600
> POWER_SUPPLY_TIME_TO_FULL_AVG=3932100
> POWER_SUPPLY_SERIAL_NUMBER=0000
> POWER_SUPPLY_VOLTAGE_MIN_DESIGN=10800000
> POWER_SUPPLY_VOLTAGE_MAX_DESIGN=10800000
> POWER_SUPPLY_ENERGY_NOW=31090000
> POWER_SUPPLY_ENERGY_FULL=42450000
> POWER_SUPPLY_ENERGY_FULL_DESIGN=41040000
> POWER_SUPPLY_CHARGE_NOW=2924000
> POWER_SUPPLY_CHARGE_FULL=3898000
> POWER_SUPPLY_CHARGE_FULL_DESIGN=3800000
> POWER_SUPPLY_CONSTANT_CHARGE_CURRENT_MAX=3000000
> POWER_SUPPLY_CONSTANT_CHARGE_VOLTAGE_MAX=12300000
> POWER_SUPPLY_MANUFACTURE_YEAR=2017
> POWER_SUPPLY_MANUFACTURE_MONTH=7
> POWER_SUPPLY_MANUFACTURE_DAY=3
> POWER_SUPPLY_MANUFACTURER=UR18650A
> POWER_SUPPLY_MODEL_NAME=GEHC
> 
> -- Sebastian
> 
> Jean-Francois Dagenais (1):
>   power: supply: sbs-battery: add ability to disable charger broadcasts
> 
> Sebastian Reichel (18):
>   kobject: increase allowed number of uevent variables
>   power: supply: core: add capacity error margin property
>   power: supply: core: add manufacture date properties
>   power: supply: core: add POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED
>   power: supply: sbs-battery: Add TI BQ20Z65 support
>   power: supply: sbs-battery: add
>     POWER_SUPPLY_PROP_CAPACITY_ERROR_MARGIN support
>   power: supply: sbs-battery: simplify read_read_string_data
>   power: supply: sbs-battery: add PEC support
>   power: supply: sbs-battery: add POWER_SUPPLY_PROP_CURRENT_AVG support
>   power: supply: sbs-battery: Improve POWER_SUPPLY_PROP_TECHNOLOGY
>     support
>   power: supply: sbs-battery: add
>     POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT/VOLTAGE_MAX support
>   power: supply: sbs-battery: add MANUFACTURE_DATE support
>   power: supply: sbs-battery: add
>     POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED support
>   power: supply: sbs-battery: fix idle battery status
>   power: supply: sbs-battery: switch from of_property_* to
>     device_property_*
>   power: supply: sbs-battery: switch to i2c's probe_new
>   power: supply: sbs-battery: constify power-supply property array
>   dt-bindings: power: sbs-battery: Convert to yaml
> 
>  Documentation/ABI/testing/sysfs-class-power   |  45 ++-
>  .../power/supply/sbs,sbs-battery.yaml         |  83 +++++
>  .../bindings/power/supply/sbs_sbs-battery.txt |  27 --
>  drivers/power/supply/power_supply_sysfs.c     |   5 +
>  drivers/power/supply/sbs-battery.c            | 348 +++++++++++++-----
>  include/linux/kobject.h                       |   2 +-
>  include/linux/power_supply.h                  |   5 +
>  7 files changed, 404 insertions(+), 111 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/power/supply/sbs,sbs-battery.yaml
>  delete mode 100644 Documentation/devicetree/bindings/power/supply/sbs_sbs-battery.txt
> 
> -- 
> 2.26.2
>
Pavel Machek May 29, 2020, 4:27 p.m. UTC | #2
Hi!

> This patchset improves support for SBS compliant batteries. Due to
> the changes, the battery now exposes 32 power supply properties and
> (un)plugging it generates a backtrace containing the following message
> without the first patch in this series:
> 
> ---------------------------
> WARNING: CPU: 0 PID: 20 at lib/kobject_uevent.c:659 add_uevent_var+0xd4/0x104
> add_uevent_var: too many keys
> ---------------------------
> 
> For references this is what an SBS battery status looks like after
> the patch series has been applied:
> 
> POWER_SUPPLY_VOLTAGE_MIN_DESIGN=10800000
> POWER_SUPPLY_VOLTAGE_MAX_DESIGN=10800000

Is that correct, BTW? sounds like these should not be equal...

Best regards,
									Pavel
Marek Szyprowski June 1, 2020, 10:40 a.m. UTC | #3
Hi Sebastian,

On 13.05.2020 20:55, Sebastian Reichel wrote:
> This patchset improves support for SBS compliant batteries. Due to
> the changes, the battery now exposes 32 power supply properties and
> (un)plugging it generates a backtrace containing the following message
> without the first patch in this series:
>
> ---------------------------
> WARNING: CPU: 0 PID: 20 at lib/kobject_uevent.c:659 add_uevent_var+0xd4/0x104
> add_uevent_var: too many keys
> ---------------------------
>
> For references this is what an SBS battery status looks like after
> the patch series has been applied:
>
> cat /sys/class/power_supply/sbs-0-000b/uevent
> POWER_SUPPLY_NAME=sbs-0-000b
> POWER_SUPPLY_TYPE=Battery
> POWER_SUPPLY_STATUS=Discharging
> POWER_SUPPLY_CAPACITY_LEVEL=Normal
> POWER_SUPPLY_HEALTH=Good
> POWER_SUPPLY_PRESENT=1
> POWER_SUPPLY_TECHNOLOGY=Li-ion
> POWER_SUPPLY_CYCLE_COUNT=12
> POWER_SUPPLY_VOLTAGE_NOW=11441000
> POWER_SUPPLY_CURRENT_NOW=-26000
> POWER_SUPPLY_CURRENT_AVG=-24000
> POWER_SUPPLY_CAPACITY=76
> POWER_SUPPLY_CAPACITY_ERROR_MARGIN=1
> POWER_SUPPLY_TEMP=198
> POWER_SUPPLY_TIME_TO_EMPTY_AVG=438600
> POWER_SUPPLY_TIME_TO_FULL_AVG=3932100
> POWER_SUPPLY_SERIAL_NUMBER=0000
> POWER_SUPPLY_VOLTAGE_MIN_DESIGN=10800000
> POWER_SUPPLY_VOLTAGE_MAX_DESIGN=10800000
> POWER_SUPPLY_ENERGY_NOW=31090000
> POWER_SUPPLY_ENERGY_FULL=42450000
> POWER_SUPPLY_ENERGY_FULL_DESIGN=41040000
> POWER_SUPPLY_CHARGE_NOW=2924000
> POWER_SUPPLY_CHARGE_FULL=3898000
> POWER_SUPPLY_CHARGE_FULL_DESIGN=3800000
> POWER_SUPPLY_CONSTANT_CHARGE_CURRENT_MAX=3000000
> POWER_SUPPLY_CONSTANT_CHARGE_VOLTAGE_MAX=12300000
> POWER_SUPPLY_MANUFACTURE_YEAR=2017
> POWER_SUPPLY_MANUFACTURE_MONTH=7
> POWER_SUPPLY_MANUFACTURE_DAY=3
> POWER_SUPPLY_MANUFACTURER=UR18650A
> POWER_SUPPLY_MODEL_NAME=GEHC

This patch landed in linux-next dated 20200529. Sadly it causes a 
regression on Samsung Exynos-based Chromebooks (Exynos5250 Snow, 
Exynos5420 Peach-Pi and Exynos5800 Peach-Pit). System boots to 
userspace, but then, when udev populates /dev, booting hangs:

[    4.435167] VFS: Mounted root (ext4 filesystem) readonly on device 
179:51.
[    4.457477] devtmpfs: mounted
[    4.460235] Freeing unused kernel memory: 1024K
[    4.464022] Run /sbin/init as init process
INIT: version 2.88 booting
[info] Using makefile-style concurrent boot in runlevel S.
[    5.102096] random: crng init done
[....] Starting the hotplug events dispatcher: systemd-udevdstarting 
version 236
[ ok .
[....] Synthesizing the initial hotplug events...[ ok done.
[....] Waiting for /dev to be fully populated...[   34.409914] 
TPS65090_RAILSDCDC1: disabling
[   34.412977] TPS65090_RAILSDCDC2: disabling
[   34.417021] TPS65090_RAILSDCDC3: disabling
[   34.423848] TPS65090_RAILSLDO1: disabling
[   34.429068] TPS65090_RAILSLDO2: disabling

Bisect between v5.7-rc1 and next-20200529 pointed me to the first bad 
commit: [c4b12a2f3f3de670f6be5e96092a2cab0b877f1a] power: supply: 
sbs-battery: simplify read_read_string_data. However reverting it in 
linux-next doesn't fix the issue, so the next commits are also relevant 
to this issue.

Let me know how can I help debugging it.

Best regards
Sebastian Reichel June 1, 2020, 5:05 p.m. UTC | #4
Hi Marek,

On Mon, Jun 01, 2020 at 12:40:27PM +0200, Marek Szyprowski wrote:
> On 13.05.2020 20:55, Sebastian Reichel wrote:
> > This patchset improves support for SBS compliant batteries. Due to
> > the changes, the battery now exposes 32 power supply properties and
> > (un)plugging it generates a backtrace containing the following message
> > without the first patch in this series:
> >
> > ---------------------------
> > WARNING: CPU: 0 PID: 20 at lib/kobject_uevent.c:659 add_uevent_var+0xd4/0x104
> > add_uevent_var: too many keys
> > ---------------------------
> >
> > For references this is what an SBS battery status looks like after
> > the patch series has been applied:
> >
> > cat /sys/class/power_supply/sbs-0-000b/uevent
> > POWER_SUPPLY_NAME=sbs-0-000b
> > POWER_SUPPLY_TYPE=Battery
> > POWER_SUPPLY_STATUS=Discharging
> > POWER_SUPPLY_CAPACITY_LEVEL=Normal
> > POWER_SUPPLY_HEALTH=Good
> > POWER_SUPPLY_PRESENT=1
> > POWER_SUPPLY_TECHNOLOGY=Li-ion
> > POWER_SUPPLY_CYCLE_COUNT=12
> > POWER_SUPPLY_VOLTAGE_NOW=11441000
> > POWER_SUPPLY_CURRENT_NOW=-26000
> > POWER_SUPPLY_CURRENT_AVG=-24000
> > POWER_SUPPLY_CAPACITY=76
> > POWER_SUPPLY_CAPACITY_ERROR_MARGIN=1
> > POWER_SUPPLY_TEMP=198
> > POWER_SUPPLY_TIME_TO_EMPTY_AVG=438600
> > POWER_SUPPLY_TIME_TO_FULL_AVG=3932100
> > POWER_SUPPLY_SERIAL_NUMBER=0000
> > POWER_SUPPLY_VOLTAGE_MIN_DESIGN=10800000
> > POWER_SUPPLY_VOLTAGE_MAX_DESIGN=10800000
> > POWER_SUPPLY_ENERGY_NOW=31090000
> > POWER_SUPPLY_ENERGY_FULL=42450000
> > POWER_SUPPLY_ENERGY_FULL_DESIGN=41040000
> > POWER_SUPPLY_CHARGE_NOW=2924000
> > POWER_SUPPLY_CHARGE_FULL=3898000
> > POWER_SUPPLY_CHARGE_FULL_DESIGN=3800000
> > POWER_SUPPLY_CONSTANT_CHARGE_CURRENT_MAX=3000000
> > POWER_SUPPLY_CONSTANT_CHARGE_VOLTAGE_MAX=12300000
> > POWER_SUPPLY_MANUFACTURE_YEAR=2017
> > POWER_SUPPLY_MANUFACTURE_MONTH=7
> > POWER_SUPPLY_MANUFACTURE_DAY=3
> > POWER_SUPPLY_MANUFACTURER=UR18650A
> > POWER_SUPPLY_MODEL_NAME=GEHC
> 
> This patch landed in linux-next dated 20200529. Sadly it causes a 
> regression on Samsung Exynos-based Chromebooks (Exynos5250 Snow, 
> Exynos5420 Peach-Pi and Exynos5800 Peach-Pit). System boots to 
> userspace, but then, when udev populates /dev, booting hangs:
> 
> [    4.435167] VFS: Mounted root (ext4 filesystem) readonly on device 
> 179:51.
> [    4.457477] devtmpfs: mounted
> [    4.460235] Freeing unused kernel memory: 1024K
> [    4.464022] Run /sbin/init as init process
> INIT: version 2.88 booting
> [info] Using makefile-style concurrent boot in runlevel S.
> [    5.102096] random: crng init done
> [....] Starting the hotplug events dispatcher: systemd-udevdstarting 
> version 236
> [ ok .
> [....] Synthesizing the initial hotplug events...[ ok done.
> [....] Waiting for /dev to be fully populated...[   34.409914] 
> TPS65090_RAILSDCDC1: disabling
> [   34.412977] TPS65090_RAILSDCDC2: disabling
> [   34.417021] TPS65090_RAILSDCDC3: disabling
> [   34.423848] TPS65090_RAILSLDO1: disabling
> [   34.429068] TPS65090_RAILSLDO2: disabling

:(

log does not look useful either.

> Bisect between v5.7-rc1 and next-20200529 pointed me to the first bad 
> commit: [c4b12a2f3f3de670f6be5e96092a2cab0b877f1a] power: supply: 
> sbs-battery: simplify read_read_string_data.

ok. I tested this on an to-be-upstreamed i.MX6 based system
and arch/arm/boot/dts/imx53-ppd.dts. I think the difference
is, that i2c-exynos5 does not expose I2C_FUNC_SMBUS_READ_BLOCK_DATA.
I hoped all systems using SBS battery support this, but now
I see I2C_FUNC_SMBUS_EMUL only supports writing block data.
Looks like I need to add another patch implementing that
using the old code with added PEC support.

In any case that should only return -ENODEV for the property
(and uevent), but not break boot. So something fishy is going
on.

> However reverting it in linux-next doesn't fix the issue, so the
> next commits are also relevant to this issue.

The next patch, which adds PEC support depends on the simplification
of sbs_read_string_data. The old, open coded variant will result in
PEC failure for string properties (which should not stop boot either
of course). Can you try reverting both?

If that helps I will revert those two instead of dropping the whole
series for this merge window.

> Let me know how can I help debugging it.

I suspect, that this is userspace endlessly retrying reading the
battery uevent when an error is returned. Could you check this?
Should be easy to see by adding some printfs.

That would mean a faulty battery could stall complete boot without
a useful error message, which is bad and needs to be fixed.

Sorry for the inconvience and thanks for your report,

-- Sebastian
Sebastian Reichel June 1, 2020, 9:57 p.m. UTC | #5
Hi,

On Fri, May 29, 2020 at 06:27:04PM +0200, Pavel Machek wrote:
> > This patchset improves support for SBS compliant batteries. Due to
> > the changes, the battery now exposes 32 power supply properties and
> > (un)plugging it generates a backtrace containing the following message
> > without the first patch in this series:
> > 
> > ---------------------------
> > WARNING: CPU: 0 PID: 20 at lib/kobject_uevent.c:659 add_uevent_var+0xd4/0x104
> > add_uevent_var: too many keys
> > ---------------------------
> > 
> > For references this is what an SBS battery status looks like after
> > the patch series has been applied:
> > 
> > POWER_SUPPLY_VOLTAGE_MIN_DESIGN=10800000
> > POWER_SUPPLY_VOLTAGE_MAX_DESIGN=10800000
> 
> Is that correct, BTW? sounds like these should not be equal...

(Some) GE batteries have weird values stored in the SBS chip.
For example manufacturer and model name are swapped:

POWER_SUPPLY_MANUFACTURER=UR18650A
POWER_SUPPLY_MODEL_NAME=GEHC

I carefully checked manufacturer/model name when writing these
patches some time ago and came to the conclusion that the batteries
do report it the wrong way around.

I will have a look for the design voltages (which are not modified
by this patchset), but I expect this to be another GE specific thing.

-- Sebastian
Marek Szyprowski June 2, 2020, 7:17 a.m. UTC | #6
Hi Sebastian,

On 01.06.2020 19:05, Sebastian Reichel wrote:
> On Mon, Jun 01, 2020 at 12:40:27PM +0200, Marek Szyprowski wrote:
>> On 13.05.2020 20:55, Sebastian Reichel wrote:
>>> This patchset improves support for SBS compliant batteries. Due to
>>> the changes, the battery now exposes 32 power supply properties and
>>> (un)plugging it generates a backtrace containing the following message
>>> without the first patch in this series:
>>>
>>> ---------------------------
>>> WARNING: CPU: 0 PID: 20 at lib/kobject_uevent.c:659 add_uevent_var+0xd4/0x104
>>> add_uevent_var: too many keys
>>> ---------------------------
>>>
>>> For references this is what an SBS battery status looks like after
>>> the patch series has been applied:
>>>
>>> cat /sys/class/power_supply/sbs-0-000b/uevent
>>> POWER_SUPPLY_NAME=sbs-0-000b
>>> POWER_SUPPLY_TYPE=Battery
>>> POWER_SUPPLY_STATUS=Discharging
>>> POWER_SUPPLY_CAPACITY_LEVEL=Normal
>>> POWER_SUPPLY_HEALTH=Good
>>> POWER_SUPPLY_PRESENT=1
>>> POWER_SUPPLY_TECHNOLOGY=Li-ion
>>> POWER_SUPPLY_CYCLE_COUNT=12
>>> POWER_SUPPLY_VOLTAGE_NOW=11441000
>>> POWER_SUPPLY_CURRENT_NOW=-26000
>>> POWER_SUPPLY_CURRENT_AVG=-24000
>>> POWER_SUPPLY_CAPACITY=76
>>> POWER_SUPPLY_CAPACITY_ERROR_MARGIN=1
>>> POWER_SUPPLY_TEMP=198
>>> POWER_SUPPLY_TIME_TO_EMPTY_AVG=438600
>>> POWER_SUPPLY_TIME_TO_FULL_AVG=3932100
>>> POWER_SUPPLY_SERIAL_NUMBER=0000
>>> POWER_SUPPLY_VOLTAGE_MIN_DESIGN=10800000
>>> POWER_SUPPLY_VOLTAGE_MAX_DESIGN=10800000
>>> POWER_SUPPLY_ENERGY_NOW=31090000
>>> POWER_SUPPLY_ENERGY_FULL=42450000
>>> POWER_SUPPLY_ENERGY_FULL_DESIGN=41040000
>>> POWER_SUPPLY_CHARGE_NOW=2924000
>>> POWER_SUPPLY_CHARGE_FULL=3898000
>>> POWER_SUPPLY_CHARGE_FULL_DESIGN=3800000
>>> POWER_SUPPLY_CONSTANT_CHARGE_CURRENT_MAX=3000000
>>> POWER_SUPPLY_CONSTANT_CHARGE_VOLTAGE_MAX=12300000
>>> POWER_SUPPLY_MANUFACTURE_YEAR=2017
>>> POWER_SUPPLY_MANUFACTURE_MONTH=7
>>> POWER_SUPPLY_MANUFACTURE_DAY=3
>>> POWER_SUPPLY_MANUFACTURER=UR18650A
>>> POWER_SUPPLY_MODEL_NAME=GEHC
>> This patch landed in linux-next dated 20200529. Sadly it causes a
>> regression on Samsung Exynos-based Chromebooks (Exynos5250 Snow,
>> Exynos5420 Peach-Pi and Exynos5800 Peach-Pit). System boots to
>> userspace, but then, when udev populates /dev, booting hangs:
>>
>> [    4.435167] VFS: Mounted root (ext4 filesystem) readonly on device
>> 179:51.
>> [    4.457477] devtmpfs: mounted
>> [    4.460235] Freeing unused kernel memory: 1024K
>> [    4.464022] Run /sbin/init as init process
>> INIT: version 2.88 booting
>> [info] Using makefile-style concurrent boot in runlevel S.
>> [    5.102096] random: crng init done
>> [....] Starting the hotplug events dispatcher: systemd-udevdstarting
>> version 236
>> [ ok .
>> [....] Synthesizing the initial hotplug events...[ ok done.
>> [....] Waiting for /dev to be fully populated...[   34.409914]
>> TPS65090_RAILSDCDC1: disabling
>> [   34.412977] TPS65090_RAILSDCDC2: disabling
>> [   34.417021] TPS65090_RAILSDCDC3: disabling
>> [   34.423848] TPS65090_RAILSLDO1: disabling
>> [   34.429068] TPS65090_RAILSLDO2: disabling
> :(
>
> log does not look useful either.
>
>> Bisect between v5.7-rc1 and next-20200529 pointed me to the first bad
>> commit: [c4b12a2f3f3de670f6be5e96092a2cab0b877f1a] power: supply:
>> sbs-battery: simplify read_read_string_data.
> ok. I tested this on an to-be-upstreamed i.MX6 based system
> and arch/arm/boot/dts/imx53-ppd.dts. I think the difference
> is, that i2c-exynos5 does not expose I2C_FUNC_SMBUS_READ_BLOCK_DATA.
> I hoped all systems using SBS battery support this, but now
> I see I2C_FUNC_SMBUS_EMUL only supports writing block data.
> Looks like I need to add another patch implementing that
> using the old code with added PEC support.
>
> In any case that should only return -ENODEV for the property
> (and uevent), but not break boot. So something fishy is going
> on.
>
>> However reverting it in linux-next doesn't fix the issue, so the
>> next commits are also relevant to this issue.
> The next patch, which adds PEC support depends on the simplification
> of sbs_read_string_data. The old, open coded variant will result in
> PEC failure for string properties (which should not stop boot either
> of course). Can you try reverting both?
Indeed, reverting both (and fixing the conflict) restores proper boot.
> If that helps I will revert those two instead of dropping the whole
> series for this merge window.
>
>> Let me know how can I help debugging it.
> I suspect, that this is userspace endlessly retrying reading the
> battery uevent when an error is returned. Could you check this?
> Should be easy to see by adding some printfs.
I've added some debug messages in sbs_get_property() and it read the 
same properties many times. However I've noticed that if I wait long 
enough booting finally continues.
> That would mean a faulty battery could stall complete boot without
> a useful error message, which is bad and needs to be fixed.
>
> Sorry for the inconvience and thanks for your report,

No problem, finding regressions is one of the linux-next goal.

Best regards
Sebastian Reichel June 2, 2020, 6:01 p.m. UTC | #7
Hi,

On Tue, Jun 02, 2020 at 09:17:09AM +0200, Marek Szyprowski wrote:
> Hi Sebastian,
> 
> On 01.06.2020 19:05, Sebastian Reichel wrote:
> > On Mon, Jun 01, 2020 at 12:40:27PM +0200, Marek Szyprowski wrote:
> >> On 13.05.2020 20:55, Sebastian Reichel wrote:
> >>> This patchset improves support for SBS compliant batteries. Due to
> >>> the changes, the battery now exposes 32 power supply properties and
> >>> (un)plugging it generates a backtrace containing the following message
> >>> without the first patch in this series:
> >>>
> >>> ---------------------------
> >>> WARNING: CPU: 0 PID: 20 at lib/kobject_uevent.c:659 add_uevent_var+0xd4/0x104
> >>> add_uevent_var: too many keys
> >>> ---------------------------
> >>>
> >>> For references this is what an SBS battery status looks like after
> >>> the patch series has been applied:
> >>>
> >>> cat /sys/class/power_supply/sbs-0-000b/uevent
> >>> POWER_SUPPLY_NAME=sbs-0-000b
> >>> POWER_SUPPLY_TYPE=Battery
> >>> POWER_SUPPLY_STATUS=Discharging
> >>> POWER_SUPPLY_CAPACITY_LEVEL=Normal
> >>> POWER_SUPPLY_HEALTH=Good
> >>> POWER_SUPPLY_PRESENT=1
> >>> POWER_SUPPLY_TECHNOLOGY=Li-ion
> >>> POWER_SUPPLY_CYCLE_COUNT=12
> >>> POWER_SUPPLY_VOLTAGE_NOW=11441000
> >>> POWER_SUPPLY_CURRENT_NOW=-26000
> >>> POWER_SUPPLY_CURRENT_AVG=-24000
> >>> POWER_SUPPLY_CAPACITY=76
> >>> POWER_SUPPLY_CAPACITY_ERROR_MARGIN=1
> >>> POWER_SUPPLY_TEMP=198
> >>> POWER_SUPPLY_TIME_TO_EMPTY_AVG=438600
> >>> POWER_SUPPLY_TIME_TO_FULL_AVG=3932100
> >>> POWER_SUPPLY_SERIAL_NUMBER=0000
> >>> POWER_SUPPLY_VOLTAGE_MIN_DESIGN=10800000
> >>> POWER_SUPPLY_VOLTAGE_MAX_DESIGN=10800000
> >>> POWER_SUPPLY_ENERGY_NOW=31090000
> >>> POWER_SUPPLY_ENERGY_FULL=42450000
> >>> POWER_SUPPLY_ENERGY_FULL_DESIGN=41040000
> >>> POWER_SUPPLY_CHARGE_NOW=2924000
> >>> POWER_SUPPLY_CHARGE_FULL=3898000
> >>> POWER_SUPPLY_CHARGE_FULL_DESIGN=3800000
> >>> POWER_SUPPLY_CONSTANT_CHARGE_CURRENT_MAX=3000000
> >>> POWER_SUPPLY_CONSTANT_CHARGE_VOLTAGE_MAX=12300000
> >>> POWER_SUPPLY_MANUFACTURE_YEAR=2017
> >>> POWER_SUPPLY_MANUFACTURE_MONTH=7
> >>> POWER_SUPPLY_MANUFACTURE_DAY=3
> >>> POWER_SUPPLY_MANUFACTURER=UR18650A
> >>> POWER_SUPPLY_MODEL_NAME=GEHC
> >> This patch landed in linux-next dated 20200529. Sadly it causes a
> >> regression on Samsung Exynos-based Chromebooks (Exynos5250 Snow,
> >> Exynos5420 Peach-Pi and Exynos5800 Peach-Pit). System boots to
> >> userspace, but then, when udev populates /dev, booting hangs:
> >>
> >> [    4.435167] VFS: Mounted root (ext4 filesystem) readonly on device
> >> 179:51.
> >> [    4.457477] devtmpfs: mounted
> >> [    4.460235] Freeing unused kernel memory: 1024K
> >> [    4.464022] Run /sbin/init as init process
> >> INIT: version 2.88 booting
> >> [info] Using makefile-style concurrent boot in runlevel S.
> >> [    5.102096] random: crng init done
> >> [....] Starting the hotplug events dispatcher: systemd-udevdstarting
> >> version 236
> >> [ ok .
> >> [....] Synthesizing the initial hotplug events...[ ok done.
> >> [....] Waiting for /dev to be fully populated...[   34.409914]
> >> TPS65090_RAILSDCDC1: disabling
> >> [   34.412977] TPS65090_RAILSDCDC2: disabling
> >> [   34.417021] TPS65090_RAILSDCDC3: disabling
> >> [   34.423848] TPS65090_RAILSLDO1: disabling
> >> [   34.429068] TPS65090_RAILSLDO2: disabling
> > :(
> >
> > log does not look useful either.
> >
> >> Bisect between v5.7-rc1 and next-20200529 pointed me to the first bad
> >> commit: [c4b12a2f3f3de670f6be5e96092a2cab0b877f1a] power: supply:
> >> sbs-battery: simplify read_read_string_data.
> > ok. I tested this on an to-be-upstreamed i.MX6 based system
> > and arch/arm/boot/dts/imx53-ppd.dts. I think the difference
> > is, that i2c-exynos5 does not expose I2C_FUNC_SMBUS_READ_BLOCK_DATA.
> > I hoped all systems using SBS battery support this, but now
> > I see I2C_FUNC_SMBUS_EMUL only supports writing block data.
> > Looks like I need to add another patch implementing that
> > using the old code with added PEC support.
> >
> > In any case that should only return -ENODEV for the property
> > (and uevent), but not break boot. So something fishy is going
> > on.
> >
> >> However reverting it in linux-next doesn't fix the issue, so the
> >> next commits are also relevant to this issue.
> > The next patch, which adds PEC support depends on the simplification
> > of sbs_read_string_data. The old, open coded variant will result in
> > PEC failure for string properties (which should not stop boot either
> > of course). Can you try reverting both?
> Indeed, reverting both (and fixing the conflict) restores proper boot.

Ok, I pushed out a revert of those two patches. They should land in
tomorrows linux-next release. Please test it.

> > If that helps I will revert those two instead of dropping the whole
> > series for this merge window.
> >
> >> Let me know how can I help debugging it.
> > I suspect, that this is userspace endlessly retrying reading the
> > battery uevent when an error is returned. Could you check this?
> > Should be easy to see by adding some printfs.
> I've added some debug messages in sbs_get_property() and it read the 
> same properties many times. However I've noticed that if I wait long 
> enough booting finally continues.

So basically userspace slows down itself massively by trying to
re-read uevent over and over when an error occurs. Does not seem
like a sensible thing to do. I will have a look at this when I find
some time.

-- Sebastian
Marek Szyprowski June 3, 2020, 6:49 p.m. UTC | #8
Hi Sebastian,

On 02.06.2020 20:01, Sebastian Reichel wrote:
> On Tue, Jun 02, 2020 at 09:17:09AM +0200, Marek Szyprowski wrote:
>> On 01.06.2020 19:05, Sebastian Reichel wrote:
>>> On Mon, Jun 01, 2020 at 12:40:27PM +0200, Marek Szyprowski wrote:
>>>> On 13.05.2020 20:55, Sebastian Reichel wrote:
>>>>> This patchset improves support for SBS compliant batteries. Due to
>>>>> the changes, the battery now exposes 32 power supply properties and
>>>>> (un)plugging it generates a backtrace containing the following message
>>>>> without the first patch in this series:
>>>>>
>>>>> ---------------------------
>>>>> WARNING: CPU: 0 PID: 20 at lib/kobject_uevent.c:659 add_uevent_var+0xd4/0x104
>>>>> add_uevent_var: too many keys
>>>>> ---------------------------
>>>>>
>>>>> For references this is what an SBS battery status looks like after
>>>>> the patch series has been applied:
>>>>>
>>>>> cat /sys/class/power_supply/sbs-0-000b/uevent
>>>>> POWER_SUPPLY_NAME=sbs-0-000b
>>>>> POWER_SUPPLY_TYPE=Battery
>>>>> POWER_SUPPLY_STATUS=Discharging
>>>>> POWER_SUPPLY_CAPACITY_LEVEL=Normal
>>>>> POWER_SUPPLY_HEALTH=Good
>>>>> POWER_SUPPLY_PRESENT=1
>>>>> POWER_SUPPLY_TECHNOLOGY=Li-ion
>>>>> POWER_SUPPLY_CYCLE_COUNT=12
>>>>> POWER_SUPPLY_VOLTAGE_NOW=11441000
>>>>> POWER_SUPPLY_CURRENT_NOW=-26000
>>>>> POWER_SUPPLY_CURRENT_AVG=-24000
>>>>> POWER_SUPPLY_CAPACITY=76
>>>>> POWER_SUPPLY_CAPACITY_ERROR_MARGIN=1
>>>>> POWER_SUPPLY_TEMP=198
>>>>> POWER_SUPPLY_TIME_TO_EMPTY_AVG=438600
>>>>> POWER_SUPPLY_TIME_TO_FULL_AVG=3932100
>>>>> POWER_SUPPLY_SERIAL_NUMBER=0000
>>>>> POWER_SUPPLY_VOLTAGE_MIN_DESIGN=10800000
>>>>> POWER_SUPPLY_VOLTAGE_MAX_DESIGN=10800000
>>>>> POWER_SUPPLY_ENERGY_NOW=31090000
>>>>> POWER_SUPPLY_ENERGY_FULL=42450000
>>>>> POWER_SUPPLY_ENERGY_FULL_DESIGN=41040000
>>>>> POWER_SUPPLY_CHARGE_NOW=2924000
>>>>> POWER_SUPPLY_CHARGE_FULL=3898000
>>>>> POWER_SUPPLY_CHARGE_FULL_DESIGN=3800000
>>>>> POWER_SUPPLY_CONSTANT_CHARGE_CURRENT_MAX=3000000
>>>>> POWER_SUPPLY_CONSTANT_CHARGE_VOLTAGE_MAX=12300000
>>>>> POWER_SUPPLY_MANUFACTURE_YEAR=2017
>>>>> POWER_SUPPLY_MANUFACTURE_MONTH=7
>>>>> POWER_SUPPLY_MANUFACTURE_DAY=3
>>>>> POWER_SUPPLY_MANUFACTURER=UR18650A
>>>>> POWER_SUPPLY_MODEL_NAME=GEHC
>>>> This patch landed in linux-next dated 20200529. Sadly it causes a
>>>> regression on Samsung Exynos-based Chromebooks (Exynos5250 Snow,
>>>> Exynos5420 Peach-Pi and Exynos5800 Peach-Pit). System boots to
>>>> userspace, but then, when udev populates /dev, booting hangs:
>>>>
>>>> [    4.435167] VFS: Mounted root (ext4 filesystem) readonly on device
>>>> 179:51.
>>>> [    4.457477] devtmpfs: mounted
>>>> [    4.460235] Freeing unused kernel memory: 1024K
>>>> [    4.464022] Run /sbin/init as init process
>>>> INIT: version 2.88 booting
>>>> [info] Using makefile-style concurrent boot in runlevel S.
>>>> [    5.102096] random: crng init done
>>>> [....] Starting the hotplug events dispatcher: systemd-udevdstarting
>>>> version 236
>>>> [ ok .
>>>> [....] Synthesizing the initial hotplug events...[ ok done.
>>>> [....] Waiting for /dev to be fully populated...[   34.409914]
>>>> TPS65090_RAILSDCDC1: disabling
>>>> [   34.412977] TPS65090_RAILSDCDC2: disabling
>>>> [   34.417021] TPS65090_RAILSDCDC3: disabling
>>>> [   34.423848] TPS65090_RAILSLDO1: disabling
>>>> [   34.429068] TPS65090_RAILSLDO2: disabling
>>> :(
>>>
>>> log does not look useful either.
>>>
>>>> Bisect between v5.7-rc1 and next-20200529 pointed me to the first bad
>>>> commit: [c4b12a2f3f3de670f6be5e96092a2cab0b877f1a] power: supply:
>>>> sbs-battery: simplify read_read_string_data.
>>> ok. I tested this on an to-be-upstreamed i.MX6 based system
>>> and arch/arm/boot/dts/imx53-ppd.dts. I think the difference
>>> is, that i2c-exynos5 does not expose I2C_FUNC_SMBUS_READ_BLOCK_DATA.
>>> I hoped all systems using SBS battery support this, but now
>>> I see I2C_FUNC_SMBUS_EMUL only supports writing block data.
>>> Looks like I need to add another patch implementing that
>>> using the old code with added PEC support.
>>>
>>> In any case that should only return -ENODEV for the property
>>> (and uevent), but not break boot. So something fishy is going
>>> on.
>>>
>>>> However reverting it in linux-next doesn't fix the issue, so the
>>>> next commits are also relevant to this issue.
>>> The next patch, which adds PEC support depends on the simplification
>>> of sbs_read_string_data. The old, open coded variant will result in
>>> PEC failure for string properties (which should not stop boot either
>>> of course). Can you try reverting both?
>> Indeed, reverting both (and fixing the conflict) restores proper boot.
> Ok, I pushed out a revert of those two patches. They should land in
> tomorrows linux-next release. Please test it.


Today's linux-next (20200603) boots fine on the Samsung Exynos-based 
Chromebooks. Let me know how if you need any help debugging the issues 
to resurrect those patches.


>>> If that helps I will revert those two instead of dropping the whole
>>> series for this merge window.
>>>
>>>> Let me know how can I help debugging it.
>>> I suspect, that this is userspace endlessly retrying reading the
>>> battery uevent when an error is returned. Could you check this?
>>> Should be easy to see by adding some printfs.
>> I've added some debug messages in sbs_get_property() and it read the
>> same properties many times. However I've noticed that if I wait long
>> enough booting finally continues.
> So basically userspace slows down itself massively by trying to
> re-read uevent over and over when an error occurs. Does not seem
> like a sensible thing to do. I will have a look at this when I find
> some time.

Best regards