[Intel-gfx] [PATCH 00/11] drm/i915/adl_p: Add support for Display Page Tables

[Jani Nikula]

On Wed, 21 Apr 2021, Imre Deak <imre.deak at intel.com> wrote:
> On Wed, Apr 21, 2021 at 02:03:45PM +0300, Jani Nikula wrote:
>> On Thu, 15 Apr 2021, Jani Nikula <jani.nikula at linux.intel.com> wrote:
>> > On Wed, 14 Apr 2021, Imre Deak <imre.deak at intel.com> wrote:
>> >> Alder Lake-P adds a new Display Page Table hardware structure, mapping
>> >> tiled framebuffer pages to the display engine, reducing the address
>> >> space required in GGTT for these framebuffers.
>> >>
>> >> This patchset adds support for this taking a minimum set of dependency
>> >> patches from the ADL_P enabling patchset at
>> >> https://patchwork.freedesktop.org/series/87897/
>> >
>> > Cc: Daniel
>> >
>> > I guess we'll need a topic branch for the base enabling to merge to both
>> > din and dign? I guess it'll need to include the stuff in
>> > topic/intel-gen-to-ver too.
>> >
>> > Shared stuff like this keeps being a problem with the separate dign
>> > branch, especially when the only way to sync is to merge both din and
>> > dign to drm-next and then backmerge to both.
>> 
>> I've created the topic branch.
>> 
>> When this series starts getting ready to merge, please use the
>> topic/adl-p-enabling branch, so we can merge it to both drm-intel-next
>> and drm-intel-gt-next.
>
> Ok, thanks, I would need a review for 4 (trivial) patches in the
> patchset. Could you explain the reason for a separate branch?

drm-intel-next and drm-intel-gt-next only get synced via merges to
drm-next, and backmerges back to each branch. If adl-p basic enabling
patches (PCI IDs, device info, etc.) only get merged to drm-intel-next,
any gt enabling in drm-intel-gt-next will be pending on the merge +
backmerge, which will be some time after the next merge window. At least
three weeks away. Additionally accumulating merge conflicts.

With the topic branch, we can merge the basics to both right away, and
continue with details in each branch separately.

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Graphics Center