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author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-04-15 10:02:43 +0200 |
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committer | Dave Airlie <airlied@redhat.com> | 2014-04-18 13:18:50 +1000 |
commit | b6ccd7b9873dc46becd11838c885d5c783784156 (patch) | |
tree | 1b9336f6be71f908854d77b2ca975943bea58e2c /drivers/gpu/drm/drm_plane_helper.c | |
parent | a82049b1f1aeb02818092455cd43134ef83d81ea (diff) | |
download | linux-stable-b6ccd7b9873dc46becd11838c885d5c783784156.tar.gz linux-stable-b6ccd7b9873dc46becd11838c885d5c783784156.tar.bz2 linux-stable-b6ccd7b9873dc46becd11838c885d5c783784156.zip |
drm/plane-helper: Don't fake-implement primary plane disabling
After thinking about this topic a bit more I've reached the conclusion
that implementing this doesn't make sense:
- The locking is all wrong: set_config(NULL) will also unlink encoders
and connectors, but those links are protected with the mode_config
mutex. In the ->disable_plane callback we only hold all modeset
locks, but eventually we want to switch to just grabbing the
per-crtc (and maybe per-plane) locks as needed, maybe based on
ww_mutexes. Having a callback which absolutely needs all modeset
locks is bad for this conversion.
Note that the same isn't true for the provided ->update_plane since
we've audited the crtc helpers to make sure that not encoder or
connector links are changed.
- There's no way to re-enable the plane with an ->update_plane: The
connectors/encoder links are lost and so we can't re-enable the
CRTC. Even without that issue the driver might have reassigned some
shared resources (as opposed to e.g. DPMS off, where drivers are not
allowed to do that to make sure the CRTC can be enabled again).
- The semantics don't make much sense: Userspace asked to scan out
black (or some other color if the driver supports a background
color), not that the screen be disabled.
- Implementing proper primary plane support (i.e. actually disabling
the primary plane without disabling the CRTC) is really simple, at
least if all the hw needs is flipping a bit. The big task is
auditing all the interactions with other ioctls when the CRTC is on
but there's no primary plane (e.g. pageflips). And some of that work
still needs to be done.
Cc: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/drm_plane_helper.c')
-rw-r--r-- | drivers/gpu/drm/drm_plane_helper.c | 33 |
1 files changed, 5 insertions, 28 deletions
diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c index e768d35ff22e..d2b1c03b3d71 100644 --- a/drivers/gpu/drm/drm_plane_helper.c +++ b/drivers/gpu/drm/drm_plane_helper.c @@ -203,9 +203,9 @@ EXPORT_SYMBOL(drm_primary_helper_update); * * Provides a default plane disable handler for primary planes. This is handler * is called in response to a userspace SetPlane operation on the plane with a - * NULL framebuffer parameter. We call the driver's modeset handler with a NULL - * framebuffer to disable the CRTC if no other planes are currently enabled. - * If other planes are still enabled on the same CRTC, we return -EBUSY. + * NULL framebuffer parameter. It unconditionally fails the disable call with + * -EINVAL the only way to disable the primary plane without driver support is + * to disable the entier CRTC. Which does not match the plane ->disable hook. * * Note that some hardware may be able to disable the primary plane without * disabling the whole CRTC. Drivers for such hardware should provide their @@ -214,34 +214,11 @@ EXPORT_SYMBOL(drm_primary_helper_update); * disabled primary plane). * * RETURNS: - * Zero on success, error code on failure + * Unconditionally returns -EINVAL. */ int drm_primary_helper_disable(struct drm_plane *plane) { - struct drm_plane *p; - struct drm_mode_set set = { - .crtc = plane->crtc, - .fb = NULL, - }; - - if (plane->crtc == NULL || plane->fb == NULL) - /* Already disabled */ - return 0; - - list_for_each_entry(p, &plane->dev->mode_config.plane_list, head) - if (p != plane && p->fb) { - DRM_DEBUG_KMS("Cannot disable primary plane while other planes are still active on CRTC.\n"); - return -EBUSY; - } - - /* - * N.B. We call set_config() directly here rather than - * drm_mode_set_config_internal() since drm_mode_setplane() already - * handles the basic refcounting and we don't need the special - * cross-CRTC refcounting (no chance of stealing connectors from - * other CRTC's with this update). - */ - return plane->crtc->funcs->set_config(&set); + return -EINVAL; } EXPORT_SYMBOL(drm_primary_helper_disable); |