test: Add PSR2 selective update tests

This tests checks if hardware is able to do selective update when
screen changes.
PSR2 don't trigger interruptions and the 'PSR2 SU status' register
is not kept loaded all the times, so it is necessary keep polling
PSR status debugfs until those values are loaded.

Also from DEEP_SLEEP state HW will not do a seletive update, as
most of the memory/context is lost in deep sleep state hardware will
need to exit PSR mode then wait a configured number of frames to
activate PSR again to then start doing seletive updates, that is why
just one screen change is not enough to pass this tests.

When a selective update happens and the values are loaded and read
from debugfs it is compared with the expected value of seletive
update blocks, if matches the polling is stopped and the test passed
otherwise it will wait until it reachs a maximum number o screen
changes to fail the test.

v2: Using new SU blocks debugfs output

v3:
- removed the timerfd to fail the test, now failing based in a
maximum number of screen changes
- removing thread to read debugfs, read from main thread is enough
- improved commit message

v4:
- getting cairo context for frontbuffer test in prepare()
- droppoing poll(), using blocking timerfd instead

v5:
- Doing a modeset before trying to enable PSR2

v6:
- doing atomic commits to fix(legacy commit is taking more time in
recent kernels causing us to miss the SU when reading debugfs) and
speedup test
- fixed code to skip test when PSR2 is not possile

Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Tested-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/tests/meson.build b/tests/meson.build
index 0f12df26..ec980651 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -49,6 +49,7 @@ test_progs = [
 	'kms_plane_scaling',
 	'kms_properties',
 	'kms_psr',
+	'kms_psr2_su',
 	'kms_pwrite_crc',
 	'kms_rmfb',
 	'kms_rotation_crc',