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drm/msm/mdp5: Use plane helpers to configure src/dst rectangles

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The MDP5 plane's atomic_check ops doesn't perform clipping tests.
This didn't hurt us much in the past, but clipping becomes important
with cursor planes.

Use drm_plane_helper_check_state, the way rockchip/intel/mtk drivers
already do. Use these drivers as reference.

Clipping requires knowledge of the crtc width and height. This requires
us to call drm_atomic_helper_check_modeset before
drm_atomic_helper_check_planes in the driver's atomic_check op, because
check_modetest will populate the mode for the crtc, needed to populate
the clip rectangle.

We update the plane_enabled(state) local helper to use state->visible,
since state->visible and 'state->fb && state->crtc' represent the same
thing.

One issue with the existing code is that we don't have a way to disable
the plane when it's completely clipped out. Until there isn't an update
on the crtc (which would de-stage the plane), we would still see the
plane in its last 'visible' configuration.

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Archit Taneja
2017-01-16 11:46:17 +05:30
committed by Rob Clark
parent 106f9727dd
commit 3b6acf1440
2 changed files with 59 additions and 19 deletions
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21
drivers/gpu/drm/msm/msm_atomic.c
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@@ -151,20 +151,29 @@ static void commit_worker(struct work_struct *work)
complete_commit(container_of(work, struct msm_commit, work), true);
}
/*
* this func is identical to the drm_atomic_helper_check, but we keep this
* because we might eventually need to have a more finegrained check
* sequence without using the atomic helpers.
*
* In the past, we first called drm_atomic_helper_check_planes, and then
* drm_atomic_helper_check_modeset. We needed this because the MDP5 plane's
* ->atomic_check could update ->mode_changed for pixel format changes.
* This, however isn't needed now because if there is a pixel format change,
* we just assign a new hwpipe for it with a new SMP allocation. We might
* eventually hit a condition where we would need to do a full modeset if
* we run out of planes. There, we'd probably need to set mode_changed.
*/
int msm_atomic_check(struct drm_device *dev,
struct drm_atomic_state *state)
{
int ret;
/*
* msm ->atomic_check can update ->mode_changed for pixel format
* changes, hence must be run before we check the modeset changes.
*/
ret = drm_atomic_helper_check_planes(dev, state);
ret = drm_atomic_helper_check_modeset(dev, state);
if (ret)
return ret;
ret = drm_atomic_helper_check_modeset(dev, state);
ret = drm_atomic_helper_check_planes(dev, state);
if (ret)
return ret;