[igt-dev] [PATCH i-g-t v2 0/1] test/kms_cursor_crc: tie some loose ends in prepare_crtc

[Melissa Wen]

Hi,

Using vkms, when running a sequence of subtests from kms_cursor_crc,
several strange timeout failures occurred. For example, running the
alpha-opaque cursor twice, the first run is successful and the second
fails. In addition, if we run the entire test in a call (i.e.: sudo
IGT_FORCE_DRIVER=vkms build/tests/kms_cursor_crc), the first subtest
passes and the rest of the subtests fail - even those that succeed when
run in isolation.

igt_debugfs-DEBUG: Opening debugfs directory '/sys/kernel/debug/dri/0'
igt_core-INFO: Timed out: Opening crc fd, and poll for first CRC.

During my debugging process, I found two issues that were blocking
execution:

1 - When a subtest fails, it exits and skips the cleaning step, leaving
the pipe_crc allocated and blocked for the next subtest; the following
patch addresses it by releasing any old pipe_crc before creating a new
one.

2 - When the CRC capture process starts, it enters an endless wait; in
the previous version, I thought it was a matter of timing in test using
vkms, but after further investigation, other problems arise in the same
subject and I am dropping the 2nd patch to better solve the problem on
the vkms side.

Changes in v2:
- Rebase 1st patch on master
- Drop the 2nd patch

Melissa Wen (1):
  test/kms_cursor_crc: release old pipe_crc before create a new one

 tests/kms_cursor_crc.c | 2 ++
 1 file changed, 2 insertions(+)

-- 
2.27.0