On 05/03/2018 02:11 PM, Harry Wentland wrote:
On 2018-05-03 04:00 AM, S, Shirish wrote:
On 5/2/2018 7:21 PM, Harry Wentland wrote:
On 2018-04-27 06:27 AM, Shirish S wrote:
This patch is in continuation to the
"843e3c7 drm/amd/display: defer modeset check in dm_update_planes_state"
where we started to eliminate the dependency on
DRM_MODE_ATOMIC_ALLOW_MODESET to be set by the user space,
which as such is not mandatory.
After deferring, this patch eliminates the dependency on the flag
for overlay planes.
Apologies for the late response. I had to think about this patch for a long
time since I'm not quite comfortable with it.
This has to be done in stages as its a pretty complex and requires thorough
testing before we free primary planes as well from dependency on modeset
flag.
Signed-off-by: Shirish S <shiris...@amd.com>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 1a63c04..87b661d 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4174,7 +4174,7 @@ static void amdgpu_dm_commit_planes(struct
drm_atomic_state *state,
}
spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
- if (!pflip_needed) {
+ if (!pflip_needed || plane->type == DRM_PLANE_TYPE_OVERLAY) {
Does this mean that whenever we have an overlay plane we won't do
amdgpu_dm_do_flip but commit_planes_to_stream instead? Is this really the
behavior we want?
commit_planes_to_stream was intended to program a new surface on a modeset
whereas amdgpu_dm_do_flip was intended for pageflips.
Need of "modeset" flag to program new surface is what we want to fix in this
patch for underlay plane and in next stages, fix manifestations caused by this approach
as and when seen.
Since the user space doesn't send modeset flag for new surface, hence to
program it, this patch checks the plane type to construct planes_count before
calling commit_planes_to_stream().
Looking at the allow_modeset flag was never quite right and we anticipated
having to rework this when having to deal with things like multiple planes.
What really has to happen is that we determine the surface_update_type in
atomic_check and then use that in atomic_commit to either program the surface
only (UPDATE_TYPE_FAST) without having to lock all pipes or to lock all pipes
(see lock_and_validation_needed in amdgpu_dm_atomic_check) if we need to
reprogram mode (UPDATE_TYPE_FULL). I don't remember exactly what
UPDATE_TYPE_MED is used for.
I don't feel comfortable taking a shortcut for DRM_PLANE_TYPE_OVERLAY without
first having a plan and patches for how to deal with the above-mentioned.
Bhawan and Andrey had a look at this before but it was never quite ready. The
work was non-trivial and potentially impacts lots of configurations and
scenarios if we don't get it right. If you're curious you can look at this
change (apologies to everyone else for posting AMD-internal link):
http://git.amd.com:8080/#/c/103931/11
If we use commit_planes_to_stream we end up losing things like the
immediate_flip flag, as well as the wait for the right moment to program the
flip that amdgpu_dm_do_flip does.
From the code, amdgpu_dm_do_flip does what you mentioned only for primary
plane and hence either way its not set for underlay.
The code wasn't designed with underlay in mind, so it will need work.
Harry
I support Harry's comments, we definitely need to strive to remove
dependency on page_fleep needed flag, AFAIK we are the only ATOMIC KMS
driver which makes a distinction between page fleep and other
surface updates, but it's better to sit and create a general plan of how
to address it for all type of planes instead of patching for overlay only.
Andrey
Regards,
Shirish S
Even more importantly we won't wait for fences
(reservation_object_wait_timeout_rcu).
Harry
WARN_ON(!dm_new_plane_state->dc_state);
plane_states_constructed[planes_count] =
dm_new_plane_state->dc_state;
@@ -4884,7 +4884,8 @@ static int dm_update_planes_state(struct dc *dc,
/* Remove any changed/removed planes */
if (!enable) {
- if (pflip_needed)
+ if (pflip_needed &&
+ plane && plane->type != DRM_PLANE_TYPE_OVERLAY)
continue;
if (!old_plane_crtc)
@@ -4931,7 +4932,8 @@ static int dm_update_planes_state(struct dc *dc,
if (!dm_new_crtc_state->stream)
continue;
- if (pflip_needed)
+ if (pflip_needed &&
+ plane && plane->type != DRM_PLANE_TYPE_OVERLAY)
continue;
WARN_ON(dm_new_plane_state->dc_state);
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