drm/atomic: Unconfuse the old_state mess in commmit_tail
I totally butcherd the job on typing the kernel-doc for these, and no
one realized. Noticed by Russell. Maarten has a more complete approach
to this confusion, by making it more explicit what the new/old state
is, instead of this magic switching behaviour.
v2:
- Liviu pointed out that wait_for_fences is even more magic. Leave
that as @state, and document @pre_swap better.
- While at it, patch in header for the reference section.
- Fix spelling issues Russell noticed.
v3: Fix up the @pre_swap note (Liviu): Also s/synchronous/blocking/,
since async flip is something else than non-blocking.
Cc: Liviu Dudau <liviu.dudau@arm.com>
Reported-by: Russell King - ARM Linux <linux@armlinux.org.uk>
Cc: Russell King - ARM Linux <linux@armlinux.org.uk>
Fixes: 9f2a7950e7 ("drm/atomic-helper: nonblocking commit support")
Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Tomeu Vizoso <tomeu.vizoso@gmail.com>
Cc: Daniel Stone <daniels@collabora.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161121171802.24147-1-daniel.vetter@ffwll.ch
hifive-unleashed-5.1
Daniel Vetter
parent
9a83a71ac0
commit
1ea0c02e70
|
|
@ -63,6 +63,9 @@ Atomic State Reset and Initialization
|
|||
.. kernel-doc:: drivers/gpu/drm/drm_atomic_helper.c
|
||||
:doc: atomic state reset and initialization
|
||||
|
||||
Helper Functions Reference
|
||||
--------------------------
|
||||
|
||||
.. kernel-doc:: include/drm/drm_atomic_helper.h
|
||||
:internal:
|
||||
|
||||
|
|
|
|||
|
|
@ -1006,13 +1006,21 @@ EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables);
|
|||
* drm_atomic_helper_wait_for_fences - wait for fences stashed in plane state
|
||||
* @dev: DRM device
|
||||
* @state: atomic state object with old state structures
|
||||
* @pre_swap: if true, do an interruptible wait
|
||||
* @pre_swap: If true, do an interruptible wait, and @state is the new state.
|
||||
* Otherwise @state is the old state.
|
||||
*
|
||||
* For implicit sync, driver should fish the exclusive fence out from the
|
||||
* incoming fb's and stash it in the drm_plane_state. This is called after
|
||||
* drm_atomic_helper_swap_state() so it uses the current plane state (and
|
||||
* just uses the atomic state to find the changed planes)
|
||||
*
|
||||
* Note that @pre_swap is needed since the point where we block for fences moves
|
||||
* around depending upon whether an atomic commit is blocking or
|
||||
* non-blocking. For async commit all waiting needs to happen after
|
||||
* drm_atomic_helper_swap_state() is called, but for synchronous commits we want
|
||||
* to wait **before** we do anything that can't be easily rolled back. That is
|
||||
* before we call drm_atomic_helper_swap_state().
|
||||
*
|
||||
* Returns zero if success or < 0 if dma_fence_wait() fails.
|
||||
*/
|
||||
int drm_atomic_helper_wait_for_fences(struct drm_device *dev,
|
||||
|
|
@ -1147,7 +1155,7 @@ EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
|
|||
|
||||
/**
|
||||
* drm_atomic_helper_commit_tail - commit atomic update to hardware
|
||||
* @state: new modeset state to be committed
|
||||
* @old_state: atomic state object with old state structures
|
||||
*
|
||||
* This is the default implemenation for the ->atomic_commit_tail() hook of the
|
||||
* &drm_mode_config_helper_funcs vtable.
|
||||
|
|
@ -1158,53 +1166,53 @@ EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
|
|||
*
|
||||
* For drivers supporting runtime PM the recommended sequence is instead ::
|
||||
*
|
||||
* drm_atomic_helper_commit_modeset_disables(dev, state);
|
||||
* drm_atomic_helper_commit_modeset_disables(dev, old_state);
|
||||
*
|
||||
* drm_atomic_helper_commit_modeset_enables(dev, state);
|
||||
* drm_atomic_helper_commit_modeset_enables(dev, old_state);
|
||||
*
|
||||
* drm_atomic_helper_commit_planes(dev, state,
|
||||
* drm_atomic_helper_commit_planes(dev, old_state,
|
||||
* DRM_PLANE_COMMIT_ACTIVE_ONLY);
|
||||
*
|
||||
* for committing the atomic update to hardware. See the kerneldoc entries for
|
||||
* these three functions for more details.
|
||||
*/
|
||||
void drm_atomic_helper_commit_tail(struct drm_atomic_state *state)
|
||||
void drm_atomic_helper_commit_tail(struct drm_atomic_state *old_state)
|
||||
{
|
||||
struct drm_device *dev = state->dev;
|
||||
struct drm_device *dev = old_state->dev;
|
||||
|
||||
drm_atomic_helper_commit_modeset_disables(dev, state);
|
||||
drm_atomic_helper_commit_modeset_disables(dev, old_state);
|
||||
|
||||
drm_atomic_helper_commit_planes(dev, state, 0);
|
||||
drm_atomic_helper_commit_planes(dev, old_state, 0);
|
||||
|
||||
drm_atomic_helper_commit_modeset_enables(dev, state);
|
||||
drm_atomic_helper_commit_modeset_enables(dev, old_state);
|
||||
|
||||
drm_atomic_helper_commit_hw_done(state);
|
||||
drm_atomic_helper_commit_hw_done(old_state);
|
||||
|
||||
drm_atomic_helper_wait_for_vblanks(dev, state);
|
||||
drm_atomic_helper_wait_for_vblanks(dev, old_state);
|
||||
|
||||
drm_atomic_helper_cleanup_planes(dev, state);
|
||||
drm_atomic_helper_cleanup_planes(dev, old_state);
|
||||
}
|
||||
EXPORT_SYMBOL(drm_atomic_helper_commit_tail);
|
||||
|
||||
static void commit_tail(struct drm_atomic_state *state)
|
||||
static void commit_tail(struct drm_atomic_state *old_state)
|
||||
{
|
||||
struct drm_device *dev = state->dev;
|
||||
struct drm_device *dev = old_state->dev;
|
||||
struct drm_mode_config_helper_funcs *funcs;
|
||||
|
||||
funcs = dev->mode_config.helper_private;
|
||||
|
||||
drm_atomic_helper_wait_for_fences(dev, state, false);
|
||||
drm_atomic_helper_wait_for_fences(dev, old_state, false);
|
||||
|
||||
drm_atomic_helper_wait_for_dependencies(state);
|
||||
drm_atomic_helper_wait_for_dependencies(old_state);
|
||||
|
||||
if (funcs && funcs->atomic_commit_tail)
|
||||
funcs->atomic_commit_tail(state);
|
||||
funcs->atomic_commit_tail(old_state);
|
||||
else
|
||||
drm_atomic_helper_commit_tail(state);
|
||||
drm_atomic_helper_commit_tail(old_state);
|
||||
|
||||
drm_atomic_helper_commit_cleanup_done(state);
|
||||
drm_atomic_helper_commit_cleanup_done(old_state);
|
||||
|
||||
drm_atomic_state_put(state);
|
||||
drm_atomic_state_put(old_state);
|
||||
}
|
||||
|
||||
static void commit_work(struct work_struct *work)
|
||||
|
|
@ -1498,10 +1506,10 @@ static struct drm_crtc_commit *preceeding_commit(struct drm_crtc *crtc)
|
|||
|
||||
/**
|
||||
* drm_atomic_helper_wait_for_dependencies - wait for required preceeding commits
|
||||
* @state: new modeset state to be committed
|
||||
* @old_state: atomic state object with old state structures
|
||||
*
|
||||
* This function waits for all preceeding commits that touch the same CRTC as
|
||||
* @state to both be committed to the hardware (as signalled by
|
||||
* @old_state to both be committed to the hardware (as signalled by
|
||||
* drm_atomic_helper_commit_hw_done) and executed by the hardware (as signalled
|
||||
* by calling drm_crtc_vblank_send_event on the event member of
|
||||
* &drm_crtc_state).
|
||||
|
|
@ -1509,7 +1517,7 @@ static struct drm_crtc_commit *preceeding_commit(struct drm_crtc *crtc)
|
|||
* This is part of the atomic helper support for nonblocking commits, see
|
||||
* drm_atomic_helper_setup_commit() for an overview.
|
||||
*/
|
||||
void drm_atomic_helper_wait_for_dependencies(struct drm_atomic_state *state)
|
||||
void drm_atomic_helper_wait_for_dependencies(struct drm_atomic_state *old_state)
|
||||
{
|
||||
struct drm_crtc *crtc;
|
||||
struct drm_crtc_state *crtc_state;
|
||||
|
|
@ -1517,7 +1525,7 @@ void drm_atomic_helper_wait_for_dependencies(struct drm_atomic_state *state)
|
|||
int i;
|
||||
long ret;
|
||||
|
||||
for_each_crtc_in_state(state, crtc, crtc_state, i) {
|
||||
for_each_crtc_in_state(old_state, crtc, crtc_state, i) {
|
||||
spin_lock(&crtc->commit_lock);
|
||||
commit = preceeding_commit(crtc);
|
||||
if (commit)
|
||||
|
|
@ -1548,7 +1556,7 @@ EXPORT_SYMBOL(drm_atomic_helper_wait_for_dependencies);
|
|||
|
||||
/**
|
||||
* drm_atomic_helper_commit_hw_done - setup possible nonblocking commit
|
||||
* @state: new modeset state to be committed
|
||||
* @old_state: atomic state object with old state structures
|
||||
*
|
||||
* This function is used to signal completion of the hardware commit step. After
|
||||
* this step the driver is not allowed to read or change any permanent software
|
||||
|
|
@ -1561,15 +1569,15 @@ EXPORT_SYMBOL(drm_atomic_helper_wait_for_dependencies);
|
|||
* This is part of the atomic helper support for nonblocking commits, see
|
||||
* drm_atomic_helper_setup_commit() for an overview.
|
||||
*/
|
||||
void drm_atomic_helper_commit_hw_done(struct drm_atomic_state *state)
|
||||
void drm_atomic_helper_commit_hw_done(struct drm_atomic_state *old_state)
|
||||
{
|
||||
struct drm_crtc *crtc;
|
||||
struct drm_crtc_state *crtc_state;
|
||||
struct drm_crtc_commit *commit;
|
||||
int i;
|
||||
|
||||
for_each_crtc_in_state(state, crtc, crtc_state, i) {
|
||||
commit = state->crtcs[i].commit;
|
||||
for_each_crtc_in_state(old_state, crtc, crtc_state, i) {
|
||||
commit = old_state->crtcs[i].commit;
|
||||
if (!commit)
|
||||
continue;
|
||||
|
||||
|
|
@ -1584,16 +1592,16 @@ EXPORT_SYMBOL(drm_atomic_helper_commit_hw_done);
|
|||
|
||||
/**
|
||||
* drm_atomic_helper_commit_cleanup_done - signal completion of commit
|
||||
* @state: new modeset state to be committed
|
||||
* @old_state: atomic state object with old state structures
|
||||
*
|
||||
* This signals completion of the atomic update @state, including any cleanup
|
||||
* work. If used, it must be called right before calling
|
||||
* This signals completion of the atomic update @old_state, including any
|
||||
* cleanup work. If used, it must be called right before calling
|
||||
* drm_atomic_state_put().
|
||||
*
|
||||
* This is part of the atomic helper support for nonblocking commits, see
|
||||
* drm_atomic_helper_setup_commit() for an overview.
|
||||
*/
|
||||
void drm_atomic_helper_commit_cleanup_done(struct drm_atomic_state *state)
|
||||
void drm_atomic_helper_commit_cleanup_done(struct drm_atomic_state *old_state)
|
||||
{
|
||||
struct drm_crtc *crtc;
|
||||
struct drm_crtc_state *crtc_state;
|
||||
|
|
@ -1601,8 +1609,8 @@ void drm_atomic_helper_commit_cleanup_done(struct drm_atomic_state *state)
|
|||
int i;
|
||||
long ret;
|
||||
|
||||
for_each_crtc_in_state(state, crtc, crtc_state, i) {
|
||||
commit = state->crtcs[i].commit;
|
||||
for_each_crtc_in_state(old_state, crtc, crtc_state, i) {
|
||||
commit = old_state->crtcs[i].commit;
|
||||
if (WARN_ON(!commit))
|
||||
continue;
|
||||
|
||||
|
|
|
|||
|
|
@ -999,10 +999,14 @@ struct drm_mode_config_helper_funcs {
|
|||
* to implement blocking and nonblocking commits easily. It is not used
|
||||
* by the atomic helpers
|
||||
*
|
||||
* This hook should first commit the given atomic state to the hardware.
|
||||
* But drivers can add more waiting calls at the start of their
|
||||
* implementation, e.g. to wait for driver-internal request for implicit
|
||||
* syncing, before starting to commit the update to the hardware.
|
||||
* This function is called when the new atomic state has already been
|
||||
* swapped into the various state pointers. The passed in state
|
||||
* therefore contains copies of the old/previous state. This hook should
|
||||
* commit the new state into hardware. Note that the helpers have
|
||||
* already waited for preceeding atomic commits and fences, but drivers
|
||||
* can add more waiting calls at the start of their implementation, e.g.
|
||||
* to wait for driver-internal request for implicit syncing, before
|
||||
* starting to commit the update to the hardware.
|
||||
*
|
||||
* After the atomic update is committed to the hardware this hook needs
|
||||
* to call drm_atomic_helper_commit_hw_done(). Then wait for the upate
|
||||
|
|
|
|||
Loading…
Reference in New Issue