[Intel-gfx] Correct DMC version for Skylake (1.23 vs 1.26)

[Jani Nikula]

On Tue, 09 Aug 2016, Daniel Klaffenbach <danielklaffenbach at gmail.com> wrote:
> Hi,
>
> which one is the correct DMC version to load for Linux 4.8-rc1? The
> binary blob in linux-firmware.git is v1.26, which is also the latest
> version available for download at the linuxgraphics website.
>
> Version 1.26 used to load just fine on Kernels 4.6 and 4.7. Commit
> 4aa7fb9c introduced version pinning for v1.26 (both in
> drm-intel-nightly and the current for-linux-next branch). Later an
> older commit was pushed (a4a027a8), which lowered the
> required DMC firmware to v1.23 again, without removing the
> pinning.
>
> Now the situation is that v1.23 is pinned ATM, but v1.26 has been
> released through linux-firmware.git and is being rolled out to end
> users right now.
>
> What to do now? Is this a bug or a feature?

You should use whichever version the kernel asks. The bug is that v1.23
was dropped from linux-firmware. We may later upgrade the firmware the
kernel asks, and even backport said upgrade to stable kernels after
ensuring it works.

Rodrigo, please fix linux-firmware.

BR,
Jani.

>
>
> Regards,
>  Dan
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-- 
Jani Nikula, Intel Open Source Technology Center