i posted this bug to bugzilla with the attached patch.
this email is to notify the maintainers.
https://bugzilla.kernel.org/show_bug.cgi?id=206259
thanks!
js
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ELAN i2c digitizer on microsoft surface go fails to initialize and
device is non-functional
initialization fails on 4.19.96:
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[ 5.507245] hid-generic 0018:04F3:261A.0005: report is too long
[ 5.507256] hid-generic 0018:04F3:261A.0005: item 0 1 0 8 parsing failed
[ 5.507290] hid-generic: probe of 0018:04F3:261A.0005 failed with error -22
[ 5.556409] hid-multitouch 0018:04F3:261A.0005: report is too long
[ 5.581641] hid-multitouch 0018:04F3:261A.0005: item 0 1 0 8 parsing failed
[ 5.618495] hid-multitouch: probe of 0018:04F3:261A.0005 failed
with error -22
initialization succeeds on 4.19.95:
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[ 7.150887] hid-generic 0018:04F3:261A.0001: input,hidraw2: I2C HID
v1.00 Device [ELAN9038:00 04F3:261A] on i2c-ELAN9038:00
[ 8.253077] input: ELAN9038:00 04F3:261A as
/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-1/i2c-ELAN9038:00/0018:04F3:261A.0001/input/input20
[ 8.253219] input: ELAN9038:00 04F3:261A Pen as
/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-1/i2c-ELAN9038:00/0018:04F3:261A.0001/input/input23
[ 8.253330] hid-multitouch 0018:04F3:261A.0001: input,hidraw0: I2C
HID v1.00 Device [ELAN9038:00 04F3:261A] on i2c-ELAN9038:00
problem seems to be due to this commit:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.19.y&id=31d06cc8e7caec36bedeb4f90444920431462f61