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sna: Switch off old outputs on topology changes 

The kernel may keep the old connector id around so that userspace can
gracefully switch it off, which means that on detecting a topology
change (a new id for an old connector path), we must do a SetCRTC to
release the old resources.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106250
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2018-11-30 14:11:04 +00:00
parent 985553dff9
commit c37c7ee074
1 changed files with 14 additions and 0 deletions
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14
src/sna/sna_display.c
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@ -5254,6 +5254,20 @@ sna_output_add(struct sna *sna, unsigned id, unsigned serial)
if (strcmp(output->name, name) == 0) {
assert(output->scrn == scrn);
assert(output->funcs == &sna_output_funcs);
/*
* If the old output is still in use, tell
* the kernel to switch it off so we can
* move its resources over to the new id.
*/
if (output->crtc) {
struct drm_mode_crtc arg = {
.crtc_id = __sna_crtc_id(to_sna_crtc(output->crtc)),
};
drmIoctl(sna->kgem.fd, DRM_IOCTL_MODE_SETCRTC, &arg);
output->crtc = NULL;
}
sna_output_destroy(output);
goto reset;
}