[elrepo] el7: Intel Braswell i2c host adapter support

[Phil Perry]

On 15/01/16 18:12, Phil Perry wrote:
> On 15/01/16 17:16, Akemi Yagi wrote:
>> On Fri, Jan 15, 2016 at 6:19 AM, Björn Gerhart <gerhart at posteo.de> wrote:
>>
>>> Hi folks,
>>>
>>> afaik the el7 kernel yet doesn't support the i2c host adapter of the
>>> Braswell chipset by Intel. However, it's possible to simply compile a newer
>>> release (taken from 3.19) of the i2c-i801 source code against the el7
>>> kernel, and the module seems to work properly.
>>>
>>> Is anybody out there already working on a kmod-i2c-i801 rpm package, or
>>> otherwise: does it make sense to contribute it for general availability in
>>> elrepo?
>>>
>>> General rpmbuild knowledge available on my side, but not into contributing
>>> for elrepo yet.
>>>
>>> Best - Björn
>>>
>>
>> We always welcome contributions.
>>
>> You can send it to us as an srpm file. Or if you are comfortable with git,
>> please submit it through our git ( https://github.com/elrepo/packages ) by
>> following the procedure shown in http://elrepo.org/tiki/GitHub .
>>
>> Thank you,
>> Akemi
>>
>>
> 
> Or this is something I could pick up for you, if you're happy to assist
> / test as you've already done most of the hard work by confirming that
> the kernel-3.19 source code compiles cleanly and works.
> 
> The only thing I'd add is I'd rather run with code backported from a
> kernel that is still supported longterm so we can easily continue to
> backport any upstream security fixes and maintain the package in elrepo.
> Thus, either 3.18 (if it contains support), or 4.1 (if it compiles
> cleanly) kernels would be possible candidates. Your thoughts welcome as
> you clearly have more experience with the module code than me.
> 

I've built the package for you and just released it to the elrepo
repository - it should show up on the mirrors shortly.


kmod-i2c-i801-0.0-2.el7.elrepo.x86_64.rpm
i2c-i801-kmod-0.0-2.el7.elrepo.src.rpm

The required Braswell support first appeared in kernel-3.19, so I've
backported the module from kernel-4.1.15. As 4.1 is a longterm kernel
branch it should be easy to maintain the module for the supported life
of that kernel.

It's probably worth filing a bug with Red Hat requesting the module be
updated in the RHEL kernel. State what you've done (i.e, simple backport
from 4.1 works) as proof of principle and someone might pick it up for you.

I'd appreciate if you could test and confirm the package works as expected.

Thanks