diff options
| author | Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> | 2019-07-31 09:45:16 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-01 08:24:44 +0200 |
| commit | cf3cf431215396397122b7608d96dae4eadf3ea1 (patch) | |
| tree | 1bbf2040e3b081274d188ed5edcfa3861fbad6c9 | |
| parent | d260d0cf9ea5ee6ae8f9cef9edf4e343fb5450ed (diff) | |
drm/amd/display: Skip determining update type for async updates
commit 43d10d30df156f7834fa91aecb69614fefc8bb0a upstream.
[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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 27 |
1 files changed, 20 insertions, 7 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 ab341fca9647..8df49740518e 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -7274,6 +7274,26 @@ 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 @@ -7326,13 +7346,6 @@ 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 */ |