** Changed in: linux (Ubuntu Focal)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1876699
Title:
add 16-bit width registers support for EEPROM at24 device
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Bionic:
In Progress
Status in linux source package in Focal:
Fix Committed
Bug description:
SRU For Bionic
[Impact]
Larger EEPROM devices that use 16-bit addresses couldn't be accessed.
The i2c/smbus currently only support to access data with 8-bit width of
address. In some larger device, such as larger EEPROM, it requires to
access the address large than 0xff, so it needs to extend address space
to 16-bit width.
[Fix]
This commit is derivated from below commit, and then modified and provided
by customer
https://patchwork.ozlabs.org/patch/545292/
Unfortunately, this commit doesn't get into mainline in the end, so I migrate
the commit to latest kernel and finally get it merged.
https://lkml.org/lkml/2020/4/24/635
[Test]
Verified on Eurotech's platforms.
[Regression Potential]
Low, this patch only changes the behavior of the device which has
AT24_FLAG_ADDR16 flag and change the page_size to 64 if the device name is
24c256.
=====================================
SRU For Focal
[Impact]
Larger EEPROM devices that use 16-bit addresses couldn't be accessed.
The i2c/smbus currently only support to access data with 8-bit width of
address. In some larger device, such as larger EEPROM, it requires to
access the address large than 0xff, so it needs to extend address space
to 16-bit width.
[Fix]
Clear cherry pick from linux-next
82f25bd73c0b regmap-i2c: add 16-bit width registers support
[Test]
Verified on Eurotech's platforms.
[Regression Potential]
Low, this patch provides new access functions for 16-bit registers,
shouldn't affect any other devices which are already working well.
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