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authorDavid Herrmann <dh.herrmann@gmail.com>2014-10-11 18:49:20 +0200
committerDavid Herrmann <dh.herrmann@gmail.com>2014-10-11 18:49:20 +0200
commitf08f302732c0597c83ec6b8022aa82faffb116f9 (patch)
treedb9b20c8db2c15e3f57457a69e8f9c5cb1bad2ed /src/libsystemd-terminal
parent76253e73f9c9c24fec755e485516f3b55d0707b4 (diff)
terminal/grdrm: force deep modeset on enter
Usually, when our session is activated (or re-configurated) we should be able to try a page-flip to our buffer. The kernel driver should reject it if it is incompatible. As it turns out, drivers don't do this. Therefore, we now force a deep modeset if we're not sure what mode is set. This has the side-effect that we might get glitches on session-switches (depending on driver behavior). However, there's no way around this and it is what everyone does so far. Most drivers still detect if we keep the mode and so don't touch the clocks. Therefore, we just get a regular async flip.
Diffstat (limited to 'src/libsystemd-terminal')
-rw-r--r--src/libsystemd-terminal/grdev-drm.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/src/libsystemd-terminal/grdev-drm.c b/src/libsystemd-terminal/grdev-drm.c
index 232321c0e2..dba6db2691 100644
--- a/src/libsystemd-terminal/grdev-drm.c
+++ b/src/libsystemd-terminal/grdev-drm.c
@@ -1158,8 +1158,21 @@ static int grdrm_crtc_commit_flip(grdrm_crtc *crtc, grdev_fb *basefb) {
assert(basefb);
assert(pipe);
- if (!crtc->applied && !grdrm_modes_compatible(&crtc->kern.mode, &crtc->set.mode))
+ if (!crtc->applied) {
+ if (!grdrm_modes_compatible(&crtc->kern.mode, &crtc->set.mode))
+ return 0;
+
+ /* TODO: Theoretically, we should be able to page-flip to our
+ * framebuffer here. We didn't perform any deep modeset, but the
+ * DRM driver is really supposed to reject our page-flip in case
+ * the FB is not compatible. We then properly fall back to a
+ * deep modeset.
+ * As it turns out, drivers don't to this. Therefore, we need to
+ * perform a full modeset on enter now. We might avoid this in
+ * the future with fixed drivers.. */
+
return 0;
+ }
fb = fb_from_base(basefb);