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Wysocki" , linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, kernel@collabora.com, 'Linux Samsung SOC' From: Marek Szyprowski Message-ID: Date: Wed, 3 Jun 2020 20:49:37 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.8.1 MIME-Version: 1.0 In-Reply-To: <20200602180119.52izs7kd72u3kmr4@earth.universe> Content-Transfer-Encoding: 8bit Content-Language: en-US X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrHKsWRmVeSWpSXmKPExsWy7djPc7oHP1yPM1gzwcRi/pFzrBbNi9ez WWw+18NqcXnXHDaLz71HGC1mnN/HZDH3y1Rmi9a9R9gt7r72c+D02HF3CaPHplWdbB77565h 9/i8SS6AJYrLJiU1J7MstUjfLoErY8mqeYwFv3Ur3szzbmBsVe9i5OSQEDCRWNfYzd7FyMUh JLCCUeLA6jPMEM4XRokl096zQjifGSV+LzzHBtNyYkEDE0RiOaPEljmX2UESQgLvGSVW7/cA sYUFLCS+LPoNFhcRMJc4cesmI0gDs8AqJok56/qZQRJsAoYSXW+7wKbyCthJ3F22hwnEZhFQ kfhx6CKYLSoQK9Fz/xUzRI2gxMmZT1i6GDk4OAVsJV5dEAEJMwvISzRvnc0MYYtL3HoyH+w4 CYFd7BJ7f61igbjaReLKgy2sELawxKvjW9ghbBmJ/zthGpoZJR6eW8sO4fQwSlxumsEIUWUt cefcLzaQzcwCmhLrd+lDhB0lJh7ezQwSlhDgk7jxVhDiCD6JSdumQ4V5JTrahCCq1SRmHV8H t/bghUvMExiVZiH5bBaSd2YheWcWwt4FjCyrGMVTS4tz01OLjfNSy/WKE3OLS/PS9ZLzczcx AlPR6X/Hv+5g3Pcn6RCjAAejEg8vQ931OCHWxLLiytxDjBIczEoivE5nT8cJ8aYkVlalFuXH F5XmpBYfYpTmYFES5zVe9DJWSCA9sSQ1OzW1ILUIJsvEwSnVwMhjIV+Y/V4xSvfFmRsnijr2 /pKz73q6l39O1uTCe6kN678xLppXmuS/YqVNYH9NpvfJBa7KP749LAwOsE6ZcUU8iDe88aOI xqUHdkwy8+a0S03WupPSriP+Lf3BTf48Vy6nmy8r+qS0ni6S1vZQXu6tmalxZ0drdOTxzJk5 6zOeV/7QMbAsUmIpzkg01GIuKk4EAOOgsaFBAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrIIsWRmVeSWpSXmKPExsVy+t/xe7oHP1yPM7h9SMJi/pFzrBbNi9ez WWw+18NqcXnXHDaLz71HGC1mnN/HZDH3y1Rmi9a9R9gt7r72c+D02HF3CaPHplWdbB77565h 9/i8SS6AJUrPpii/tCRVISO/uMRWKdrQwkjP0NJCz8jEUs/Q2DzWyshUSd/OJiU1J7MstUjf LkEvY8mqeYwFv3Ur3szzbmBsVe9i5OSQEDCROLGggamLkYtDSGApo0TH3bvMEAkZiZPTGlgh bGGJP9e62CCK3jJK/L72mR0kISxgIfFl0W8wW0TAXOLErZuMIEXMAquYJP4fW8EC0fGSSWJT 13qwsWwChhJdb0FGcXLwCthJ3F22hwnEZhFQkfhx6CKYLSoQK9G9+Ac7RI2gxMmZT4AGcXBw CthKvLogAhJmFjCTmLf5ITOELS/RvHU2lC0ucevJfKYJjEKzkHTPQtIyC0nLLCQtCxhZVjGK pJYW56bnFhvqFSfmFpfmpesl5+duYgRG37ZjPzfvYLy0MfgQowAHoxIPL0Pd9Tgh1sSy4src Q4wSHMxKIrxOZ0/HCfGmJFZWpRblxxeV5qQWH2I0BfptIrOUaHI+MDHklcQbmhqaW1gamhub G5tZKInzdggcjBESSE8sSc1OTS1ILYLpY+LglGpgbLy6beIMOYeImM9Xhf8uEiwQy3g/p3bX oifr97vn78h6wrDt1Le9mptcl/WG3MvNW3P50wqOrrYj3npzCqS/hd1u2iKQdmW6XPiiPW2C F+I4Tv7in7T0otCh+u1KvBmux9eJpe5qDOG6p6MxozXF58zph1fuBBxwkLhvuGBuSlmcs2y0 a+sBHSWW4oxEQy3mouJEACqcDyvUAgAA X-CMS-MailID: 20200603184937eucas1p20bd459cd754b6ccf28ae318740325e5d X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20200601104027eucas1p2b076ee860520d709e8178c41550653f7 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200601104027eucas1p2b076ee860520d709e8178c41550653f7 References: <20200513185615.508236-1-sebastian.reichel@collabora.com> <15933a91-dd89-1f94-c2f2-79be4395f4c1@samsung.com> <20200601170528.r5w3aeijny3v5yx3@earth.universe> <20200602180119.52izs7kd72u3kmr4@earth.universe> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 -- Marek Szyprowski, PhD Samsung R&D Institute Poland