The weston runtime test uses the CRC of the framebuffer to detect that
"something" is being drawned on the framebuffer. This requires that the
sampling of the CRC happens does not happen too early after trigerring
an action, or the rendering may be not be finishe, either:
- weston may not have had time to initialise, or
- the test application may not have started rednering,
The sequence of rendering that has been observed yields this sequence of
CRCs (elided for brevity):
- boot:
- alternating between 0x4c4126bf and 0x5d2f9aa5: console cursor
blinking
- start weston:
- 0x4c4126bf: weston switches to a cleared vt, no blinking cursor
...
- 0xe54b7895: weston is starting
...
- 0xe54b7895: wayland socket appears!
...
- 0x6bf28bdf: weston is ready
...
- start weston-simple-egl:
- 0x6bf28bdf: application is starting
...
- 0xNNNNNNNN: random CRCs while the application renders
...
- stop weston-simple-egl:
- 0xNNNNNNNN: zero, one, or two random CRCs while the application
renders before it handles SIGTERM
- 0x6bf28bdf: application is stopped
...
- stop weston:
- 0x6bf28bdf: a few CRC identical to when weston was started, while
weston is processing SIGTERM
- oscillating between 0x4c4126bf and 0x5d2f9aa5: console cursor
blinking, back to initial vt, weston dead.
So, we need to wait "enough" after each action. Moreover, when the
wayland socket appears, weston may not have stabilised yet, so we also
need to wait after the socket appears.
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Julien Olivain <ju.o@free.fr>
This test is a followup of the discussion at:
https://lists.buildroot.org/pipermail/buildroot/2023-July/671639.html
It provides an example of a runtime tests using standard Linux graphic
components (Kernel, DRM, Mesa3D, weston).
Signed-off-by: Julien Olivain <ju.o@free.fr>
[yann.morin.1998@free.fr:
- use an overlay rather than create config file at runtime
- sleep in python not in target
- increase delay to capture DRI CRCs
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
