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drm/plane-helper: Skip prepare_fb/cleanup_fb when newfb==oldfb

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When commiting a plane update where the framebuffer doesn't change, we
can skip the prepare_fb/cleanup_fb steps.  This also allows us to avoid
an unnecessary vblank wait at the end of the operation when we're just
moving a plane and not changing its image (e.g., for a cursor).

At the moment, i915 is the only upstream driver using the transitional
plane helpers, and thus the only driver affected by this change.

Note that this replicates a corresponding change in the atomic helpers
implemented in

commit ab58e3384b
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Mon Nov 24 20:42:42 2014 +0100

    drm/atomic-helper: Skip vblank waits for unchanged fbs

Reported-by: Jeremiah Mahler <jmmahler@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=88540
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Tested-by: Tested-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Matt Roper 2015-01-19 08:31:49 -08:00 committed by Daniel Vetter
parent 281d1bbd34
commit 9289058362
1 changed files with 9 additions and 1 deletions
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10
drivers/gpu/drm/drm_plane_helper.c
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@ -435,7 +435,8 @@ int drm_plane_helper_commit(struct drm_plane *plane,
goto out;
}
if (plane_funcs->prepare_fb && plane_state->fb) {
if (plane_funcs->prepare_fb && plane_state->fb &&
plane_state->fb != old_fb) {
ret = plane_funcs->prepare_fb(plane, plane_state->fb);
if (ret)
goto out;
@ -456,6 +457,13 @@ int drm_plane_helper_commit(struct drm_plane *plane,
crtc_funcs[i]->atomic_flush(crtc[i]);
}
/*
* If we only moved the plane and didn't change fb's, there's no need to
* wait for vblank.
*/
if (plane->state->fb == old_fb)
goto out;
for (i = 0; i < 2; i++) {
if (!crtc[i])
continue;