Am Montag, 13. August 2018, 09:11:07 CEST schrieb Tomasz Figa:
> Hi Enric,
>
> On Tue, Aug 7, 2018 at 12:53 AM Enric Balletbo i Serra
> <enric.balletbo@xxxxxxxxxxxxx> wrote:
> >
> > Add support to async updates of cursors by using the new atomic
> > interface for that.
> >
> > Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
> > ---
> > 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.
>
> Thanks for the patch. This feature might look like a really minor
> thing, but we really had hard time dealing with users complaints, so
> having this in upstream would be a really useful thing.
>
> Let me post some comments inline.
>
> >
> > 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;
>
> While it covers for quite a big part of cursor movements, you may
> still expect jumpy cursor when hoovering text boxes or hyperlinks,
> since it changes the cursor image. Our downstream patch [1] actually
> took care of changing the framebuffer as well, although with the added
> complexity of referencing the old buffer at update time and releasing
> it in a flip work.
>
> [1] https://chromium.git.corp.google.com/chromiumos/third_party/kernel/+/1ad887e1a1349991c9e137b48cb32086e65347fc%5E%21/
[1] https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/394492
for non-google people ;-)
Heiko
> > +
> > + 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);
>
> We should use the inhibit mechanism when accessing VOP hardware. While
> the flush is expected to keep the PSR disabled for at least 100 ms,
> we're not in any atomic (pun not intended) context here and might get
> preempted for some unspecified time in very high load conditions.
>
> Best regards,
> Tomasz
>
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