71f6fa90a353605bf25c36417c9ae529ac1a9a8d is the first bad commit
commit 71f6fa90a353605bf25c36417c9ae529ac1a9a8d
Author: Song, Hongyan <[email protected]>
Date: Fri Aug 3 14:45:59 2018 +0800
HID: increase maximum global item tag report size to 256
The maximum globale report size has changed from 32->...->96->128 in the
past
years. With the development usage of HID, the report_size max value 128
cannot
satisfy all requirements.
There are applications need to expose intrinsic metadata to camera
stabilizing
applications such as 3DFE application. 3DFE intrinsic is designed to express
environmental information about sensor that may dynamically change while the
sensor is running (such data include noise spectral density, bias standard
deviation)
A sensor data field is SENSOR_VALUE_PAIR that consists of a PROPERTYKEY and
PROPVARIANT pair. It need to report a unique PROPERTYKEY for each data
field.
Take “Noise Spectral Density” as an example, it report count will be
defined as below:
"Size of Property key GUID(16 Byte) + property key index(4 Byte) +
size of Noise Spectral Density value(4 Byte)"
In this case, the data report max is totally 192(24Byte), which is larger
than
128, while max size 128 blocked it as illegal length. So increase the report
size to satisfy it and more demands in the future.
Signed-off-by: Song Hongyan <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
:040000 040000 c44ade4341c21e45c653cce63bee3a1411a9cc72
90c14f2502206b9b4884e49cbe1fdef5602a795d M drivers
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hid-sensor-hub spamming dmesg in 4.20
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