diff options
author | Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> | 2019-07-31 09:45:16 -0400 |
---|---|---|
committer | Alex Deucher <alexander.deucher@amd.com> | 2019-08-02 10:30:38 -0500 |
commit | 43d10d30df156f7834fa91aecb69614fefc8bb0a (patch) | |
tree | 38fc438eacabe70c09da3ddf7999792e472a8909 /drivers/gpu/drm | |
parent | e16e37efb4c9eb7bcb9dab756c975040c5257e98 (diff) | |
download | linux-43d10d30df156f7834fa91aecb69614fefc8bb0a.tar.bz2 |
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>
Diffstat (limited to 'drivers/gpu/drm')
-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 a833b23f34ab..511480df7e63 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -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 */ |