[igt-dev] [PATCH i-g-t v2 0/4] kms_plane: Add clipping subtests

[Imre Deak]

On Wed, Mar 07, 2018 at 06:03:19PM +0100, Daniel Vetter wrote:
> On Tue, Mar 06, 2018 at 06:52:11PM +0200, Imre Deak wrote:
> > This is v2 of [1], fixing the issues reported by Arek and CI. Besides
> > the changes described in patch 4, there is also an FBC workaround
> > applied now in kernel. Without the WA the test cases using the primary
> > plane (with FBC) could trigger FIFO underflow errors.
> > 
> > Note that the subtest takes ~40 seconds to run on a single pipe.
> 
> Do we need to spend that much time testing clipping? What's the overlap
> with all the various other plane clipping tests we have already, which
> focus exclusively on the cursor?

There's no other clipping tests using non-cursor planes. I think we are
missing coverage here: with the plane's start/end located close to the
screen edge triggered FIFO underflows due to two new issues already.

To reduce the runtime: in this patchset I removed one redundant modeset
after capturing the CRC, so I can't see what to improve on that front.
It goes through all format-sizes/tiling/rotation and planes so we could
avoid doing some of that maybe splitting them into separate subtests and
not running them for patchwork checks.

Not sure if CRC capturing is the most optimal in this test, I could look
into improving that. Maybe Maarten has some idea?

--Imre

> 
> Note: Not blocking this, just want to make sure we have some overall plan
> here maybe and aren't digging ourselves some comfy graves :-)
> 
> Cheers, Daniel
> 
> > 
> > [1]
> > https://lists.freedesktop.org/archives/igt-dev/2018-February/000523.html
> > 
> > Cc: Mika Kahola <mika.kahola at intel.com>
> > Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> > Cc: Juha-Pekka Heikkil?? <juha-pekka.heikkila at intel.com>
> > Cc: Arkadiusz Hiler <arkadiusz.hiler at intel.com>
> > 
> > Imre Deak (4):
> >   kms_plane: Remove redundant modeset after CRC capture
> >   lib: Export helpers to get rotation/tiling strings
> >   kms_plane: Split helpers creating reference FB and capturing CRC
> >   kms_plane: Add clipping subtests
> > 
> >  lib/igt_fb.c      |  23 +++
> >  lib/igt_fb.h      |   1 +
> >  lib/igt_kms.c     |  11 +-
> >  lib/igt_kms.h     |   1 +
> >  tests/kms_plane.c | 502 +++++++++++++++++++++++++++++++++++++++++++++++++++---
> >  5 files changed, 517 insertions(+), 21 deletions(-)
> > 
> > -- 
> > 2.13.2
> > 
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> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch