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Subject[PATCH] drm/rockchip: update cursors asynchronously through atomic.
Date
Add support to async updates of cursors by using the new atomic
interface for that.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
---
Hi,

This first version is slightly different from the RFC, note that I did
not maintain the Sean reviewed tag for that reason. With this version I
don't touch the atomic_update function and all is implemented in the
async_check/update functions. See the changelog for a list of changes.

The patch was tested on a Samsung Chromebook Plus in two ways.

1. Running all igt kms_cursor_legacy and kms_atomic@plane_cursor_legacy
tests and see that there is no regression after the patch.

2. Running weston using the atomic API.

Best regards,
Enric

Changes in v1:
- Rebased on top of drm-misc
- In async_check call drm_atomic_helper_check_plane_state to check that
the desired plane is valid and update various bits of derived state
(clipped coordinates etc.)
- In async_check allow to configure new scaling in the fast path.
- In async_update force to flush all registered PSR encoders.
- In async_update call atomic_update directly.
- In async_update call vop_cfg_done needed to set the vop registers and take effect.

drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 53 +++++++++++++++++++++
1 file changed, 53 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index e9f91278137d..dab70056ee73 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -811,10 +811,63 @@ static void vop_plane_atomic_update(struct drm_plane *plane,
spin_unlock(&vop->reg_lock);
}

+static int vop_plane_atomic_async_check(struct drm_plane *plane,
+ struct drm_plane_state *state)
+{
+ struct vop_win *vop_win = to_vop_win(plane);
+ const struct vop_win_data *win = vop_win->data;
+ int min_scale = win->phy->scl ? FRAC_16_16(1, 8) :
+ DRM_PLANE_HELPER_NO_SCALING;
+ int max_scale = win->phy->scl ? FRAC_16_16(8, 1) :
+ DRM_PLANE_HELPER_NO_SCALING;
+ int ret;
+
+ if (plane != state->crtc->cursor)
+ return -EINVAL;
+
+ if (!plane->state)
+ return -EINVAL;
+
+ if (!plane->state->fb ||
+ plane->state->fb != state->fb)
+ return -EINVAL;
+
+ ret = drm_atomic_helper_check_plane_state(plane->state,
+ plane->crtc->state,
+ min_scale, max_scale,
+ true, true);
+ return ret;
+}
+
+static void vop_plane_atomic_async_update(struct drm_plane *plane,
+ struct drm_plane_state *new_state)
+{
+ struct vop *vop = to_vop(plane->state->crtc);
+
+ plane->state->crtc_x = new_state->crtc_x;
+ plane->state->crtc_y = new_state->crtc_y;
+ plane->state->crtc_h = new_state->crtc_h;
+ plane->state->crtc_w = new_state->crtc_w;
+ plane->state->src_x = new_state->src_x;
+ plane->state->src_y = new_state->src_y;
+ plane->state->src_h = new_state->src_h;
+ plane->state->src_w = new_state->src_w;
+
+ if (vop->is_enabled) {
+ rockchip_drm_psr_flush_all(plane->dev);
+ vop_plane_atomic_update(plane, plane->state);
+ spin_lock(&vop->reg_lock);
+ vop_cfg_done(vop);
+ spin_unlock(&vop->reg_lock);
+ }
+}
+
static const struct drm_plane_helper_funcs plane_helper_funcs = {
.atomic_check = vop_plane_atomic_check,
.atomic_update = vop_plane_atomic_update,
.atomic_disable = vop_plane_atomic_disable,
+ .atomic_async_check = vop_plane_atomic_async_check,
+ .atomic_async_update = vop_plane_atomic_async_update,
};

static const struct drm_plane_funcs vop_plane_funcs = {
--
2.18.0
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