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drm/amd/display: Skip determining update type for async updates 

[Why]
By passing through the dm_determine_update_type_for_commit for atomic
commits that can be done asynchronously we are incurring a
performance penalty by locking access to the global private object
and holding that access until the end of the programming sequence.

This is also allocating a new large dc_state on every access in addition
to retaining all the references on each stream and plane until the end
of the programming sequence.

[How]
Shift the determination for async update before validation. Return early
if it's going to be an async update.

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: David Francis <david.francis@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas 2019-07-31 09:45:16 -04:00 committed by Alex Deucher
parent e16e37efb4
commit 43d10d30df
1 changed files with 20 additions and 7 deletions
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27
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@ -7275,6 +7275,26 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
if (ret)
goto fail;
if (state->legacy_cursor_update) {
/*
* This is a fast cursor update coming from the plane update
* helper, check if it can be done asynchronously for better
* performance.
*/
state->async_update =
!drm_atomic_helper_async_check(dev, state);
/*
* Skip the remaining global validation if this is an async
* update. Cursor updates can be done without affecting
* state or bandwidth calcs and this avoids the performance
* penalty of locking the private state object and
* allocating a new dc_state.
*/
if (state->async_update)
return 0;
}
/* Check scaling and underscan changes*/
/* TODO Removed scaling changes validation due to inability to commit
* new stream into context w\o causing full reset. Need to
@ -7327,13 +7347,6 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
ret = -EINVAL;
goto fail;
}
} else if (state->legacy_cursor_update) {
/*
* This is a fast cursor update coming from the plane update
* helper, check if it can be done asynchronously for better
* performance.
*/
state->async_update = !drm_atomic_helper_async_check(dev, state);
}
/* Must be success */