Re: [PATCH v3 0/2] Handle unsupported configuration with IF-ID

["Lankhorst, Maarten" <maarten.lankhorst@intel.com>]

Mahesh Kumar schreef op di 18-07-2017 om 18:12 [+0530]:
> Hi Daniel,
> 
> On Monday 17 July 2017 12:56 PM, Daniel Vetter wrote:
> > On Fri, Jun 30, 2017 at 05:40:58PM +0530, Mahesh Kumar wrote:
> > > Gen9+ Interlace fetch mode doesn't support few plane
> > > configurations & pipe scaling.
> > >  - Y-tile
> > >  - 90/270 rotation
> > >  - pipe/plane scaling
> > >  - 420 planar formats
> > 
> > Do we have igt testcases that try to exercise all this? When fixing
> > bugs,
> > pls make sure you don't fix the bugs, but also make sure we have
> > solid
> > coverage. Given that this escaped for years, it's very likely our
> > coverage
> > is _really_ bad and needs to be improve a lot for testing
> > interlaced modes
> > ...
>  We have testdisplay with -y option to test Y-tiling (90/270 rotation
> need Y-tiling so those are also covered).
> But AFAIK we don't have any testcase to verify scaling with Interlace
> mode & other combinations.
> Should we extend existing IGT test for scaling/rotation/tiling/pixel-
> format to include Interlace mode as well, or should we have a
> separate Interlace mode specific IGT
> which will exercise all combinations with all Interlace modes?

We need separate tests. testdisplay is nice for testing, but it's not
automated. Ideally something that runs on all supported platforms,
regardless of having an actual interlaced display connected. We do
allow mode override with igt_output_override_mode, which could be used
for this.

> As IF-ID mode doesn't support all the above combination but PF-ID
> mode does support them from GEN9(scaling Y-tile 90/270 rotation etc).
> So I submitted a patch to always enable PF-ID mode for Interlace
> https://patchwork.freedesktop.org/patch/160275/
> But Ville suggested not to always enable PF-ID mode instead control
> fetching mode based on property.
> Currently there is no open source user for this property. What will
> you suggest here?
> 
> Thanks,
> -Mahesh
> > Thanks, Daniel
> > 
> > > Changes since V2:
> > >  - Address review comments from ville
> > > 
> > > Mahesh Kumar (2):
> > >   drm/i915/skl+: Check for supported plane configuration in
> > > Interlace
> > >     mode
> > >   drm/i915/skl+: Scaling not supported in IF-ID Interlace mode
> > > 
> > >  drivers/gpu/drm/i915/intel_atomic_plane.c | 15 +++++++++++++++
> > >  drivers/gpu/drm/i915/intel_display.c      | 15 +++++++++++++++
> > >  2 files changed, 30 insertions(+)
> > > 
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