Re: [PATCH v2] drm/rockchip: update cursors asynchronously through atomic.

From: Enric Balletbo Serra
Date: Mon Nov 19 2018 - 04:01:36 EST

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Hi Tomasz,

cc'ing Helen as she will continue the work.

Missatge de Tomasz Figa <tfiga@xxxxxxxxxxxx> del dia dc., 14 de nov.
2018 a les 9:49:
>
> Hi Enric,
>
> On Fri, Sep 28, 2018 at 5:27 PM 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 is a second version of the patch to add async-plane update support
> > to the Rockchip driver.
> >
>
> I'm really sorry for the super late reply. I couldn't get cycles to
> look at this earlier. :(
>

No problem, many thanks for looking at it.

> > The patch was tested on a Samsung Chromebook Plus in two ways.
> >
> > 1. Running all igt kms_cursor_legacy and kms_atomic tests and see that
> > there is no regression after the patch.
> > Note that before the patch, the following igt tests failed:
> > - basic-flip-before-cursor-legacy
> > - basic-flip-before-cursor-atomic
> > - cursor-vs-flip-legacy
> > - cursor-vs-flip-toggle
> > - flip-vs-cursor-atomic
> > - flip-vs-cursor-crc-atomic
> > - flip-vs-cursor-crc-legacy
> > - flip-vs-cursor-legacy
> > - flip-vs-cursor-crc-atomic
> > - flip-vs-cursor-crc-legacy
>
> Are the last 2 tests repeated?
>
Right, are repeated sorry.

> >
> > With the patch applied only two tests don't fail (these two are
> > expexted to not pass right now):
> > - flip-vs-cursor-crc-atomic
> > - flip-vs-cursor-crc-legac
>
> Did you mean "don't pass"?
>

Yes, the only two tests that don't pass are the cursor-crc ones.

> >
> > You can check full IGT test report here:
> > - Before the patch:
> > https://people.collabora.com/~eballetbo/tests/igt/samsung-chromebook-plus/igt-1.23/4.19-rc5/index.html
> > - With the patch applied:
> > https://people.collabora.com/~eballetbo/tests/igt/samsung-chromebook-plus/igt-1.23/4.19-rc5-async-update/index.html
> >
> > 2. Running weston using the atomic API.
> >
> > Best regards,
> > Enric
> >
> > Changes in v2:
> > - Change the framebuffer as well to cover jumpy cursor when hovering
> > text boxes or hyperlink. (Tomasz)
> > - Use the PSR inhibit mechanism when accessing VOP hardware instead of
> > PSR flushing (Tomasz)
> >
> > 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_fb.c | 36 ------------
> > drivers/gpu/drm/rockchip/rockchip_drm_psr.c | 37 ++++++++++++
> > drivers/gpu/drm/rockchip/rockchip_drm_psr.h | 3 +
> > drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 62 +++++++++++++++++++++
> > 4 files changed, 102 insertions(+), 36 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> > index 7b6f7227d476..aec9a997de13 100644
> > --- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> > +++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> > @@ -128,24 +128,6 @@ rockchip_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
> > return ERR_PTR(ret);
> > }
> >
> > -static void
> > -rockchip_drm_psr_inhibit_get_state(struct drm_atomic_state *state)
> > -{
> > - struct drm_crtc *crtc;
> > - struct drm_crtc_state *crtc_state;
> > - struct drm_encoder *encoder;
> > - u32 encoder_mask = 0;
> > - int i;
> > -
> > - for_each_old_crtc_in_state(state, crtc, crtc_state, i) {
> > - encoder_mask |= crtc_state->encoder_mask;
> > - encoder_mask |= crtc->state->encoder_mask;
> > - }
> > -
> > - drm_for_each_encoder_mask(encoder, state->dev, encoder_mask)
> > - rockchip_drm_psr_inhibit_get(encoder);
> > -}
> > -
> > uint32_t rockchip_drm_get_vblank_ns(struct drm_display_mode *mode)
> > {
> > uint64_t vblank_time = mode->vtotal - mode->vdisplay;
> > @@ -156,24 +138,6 @@ uint32_t rockchip_drm_get_vblank_ns(struct drm_display_mode *mode)
> > return vblank_time;
> > }
> >
> > -static void
> > -rockchip_drm_psr_inhibit_put_state(struct drm_atomic_state *state)
> > -{
> > - struct drm_crtc *crtc;
> > - struct drm_crtc_state *crtc_state;
> > - struct drm_encoder *encoder;
> > - u32 encoder_mask = 0;
> > - int i;
> > -
> > - for_each_old_crtc_in_state(state, crtc, crtc_state, i) {
> > - encoder_mask |= crtc_state->encoder_mask;
> > - encoder_mask |= crtc->state->encoder_mask;
> > - }
> > -
> > - drm_for_each_encoder_mask(encoder, state->dev, encoder_mask)
> > - rockchip_drm_psr_inhibit_put(encoder);
> > -}
> > -
> > static void
> > rockchip_atomic_helper_commit_tail_rpm(struct drm_atomic_state *old_state)
> > {
> > diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
> > index 79d00d861a31..1635485955d3 100644
> > --- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
> > +++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
> > @@ -13,6 +13,7 @@
> > */
> >
> > #include <drm/drmP.h>
> > +#include <drm/drm_atomic.h>
> > #include <drm/drm_crtc_helper.h>
> >
> > #include "rockchip_drm_drv.h"
> > @@ -109,6 +110,42 @@ int rockchip_drm_psr_inhibit_put(struct drm_encoder *encoder)
> > }
> > EXPORT_SYMBOL(rockchip_drm_psr_inhibit_put);
> >
> > +void rockchip_drm_psr_inhibit_get_state(struct drm_atomic_state *state)
> > +{
> > + struct drm_crtc *crtc;
> > + struct drm_crtc_state *crtc_state;
> > + struct drm_encoder *encoder;
> > + u32 encoder_mask = 0;
> > + int i;
> > +
> > + for_each_old_crtc_in_state(state, crtc, crtc_state, i) {
> > + encoder_mask |= crtc_state->encoder_mask;
> > + encoder_mask |= crtc->state->encoder_mask;
> > + }
> > +
> > + drm_for_each_encoder_mask(encoder, state->dev, encoder_mask)
> > + rockchip_drm_psr_inhibit_get(encoder);
> > +}
> > +EXPORT_SYMBOL(rockchip_drm_psr_inhibit_get_state);
> > +
> > +void rockchip_drm_psr_inhibit_put_state(struct drm_atomic_state *state)
> > +{
> > + struct drm_crtc *crtc;
> > + struct drm_crtc_state *crtc_state;
> > + struct drm_encoder *encoder;
> > + u32 encoder_mask = 0;
> > + int i;
> > +
> > + for_each_old_crtc_in_state(state, crtc, crtc_state, i) {
> > + encoder_mask |= crtc_state->encoder_mask;
> > + encoder_mask |= crtc->state->encoder_mask;
> > + }
> > +
> > + drm_for_each_encoder_mask(encoder, state->dev, encoder_mask)
> > + rockchip_drm_psr_inhibit_put(encoder);
> > +}
> > +EXPORT_SYMBOL(rockchip_drm_psr_inhibit_put_state);
> > +
> > /**
> > * rockchip_drm_psr_inhibit_get - acquire PSR inhibit on given encoder
> > * @encoder: encoder to obtain the PSR encoder
> > diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_psr.h b/drivers/gpu/drm/rockchip/rockchip_drm_psr.h
> > index 860c62494496..25350ba3237b 100644
> > --- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.h
> > +++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.h
> > @@ -20,6 +20,9 @@ void rockchip_drm_psr_flush_all(struct drm_device *dev);
> > int rockchip_drm_psr_inhibit_put(struct drm_encoder *encoder);
> > int rockchip_drm_psr_inhibit_get(struct drm_encoder *encoder);
> >
> > +void rockchip_drm_psr_inhibit_get_state(struct drm_atomic_state *state);
> > +void rockchip_drm_psr_inhibit_put_state(struct drm_atomic_state *state);
> > +
> > int rockchip_drm_psr_register(struct drm_encoder *encoder,
> > int (*psr_set)(struct drm_encoder *, bool enable));
> > void rockchip_drm_psr_unregister(struct drm_encoder *encoder);
> > diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> > index 6642c2b9bb3c..682ce40166f7 100644
> > --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> > +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> > @@ -819,10 +819,72 @@ 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;
> > + struct drm_crtc_state *crtc_state;
> > + int ret;
> > +
> > + if (plane != state->crtc->cursor)
> > + return -EINVAL;
> > +
> > + if (!plane->state)
> > + return -EINVAL;
> > +
> > + if (!plane->state->fb)
> > + return -EINVAL;
> > +
> > + if (state->state)
> > + crtc_state = drm_atomic_get_existing_crtc_state(state->state,
> > + state->crtc);
> > + else /* Special case for asynchronous cursor updates. */
> > + crtc_state = plane->crtc->state;
> > +
> > + ret = drm_atomic_helper_check_plane_state(plane->state,
> > + 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;
> > +
> > + drm_atomic_set_fb_for_plane(plane->state, new_state->fb);
>
> Isn't this going to drop the old fb reference on the floor without
> waiting for the hardware to actually stop scanning out from it?
>

Hmm, yes you've reason. Thanks for pointing it.

> I believe we need to do something similar to what's already in
> vop_crtc_commit_flush(), but not called on this async path
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/gpu/drm/rockchip/rockchip_drm_vop.c?h=next-20181114#n1045
>
> Perhaps it would be an option to call vop_crtc_commit_flush() from here?
>

We'll look at this for the third version, thanks!

> Best regards,
> Tomasz
>
> > +
> > + if (vop->is_enabled) {
> > + rockchip_drm_psr_inhibit_get_state(new_state->state);
> > + vop_plane_atomic_update(plane, plane->state);
> > + spin_lock(&vop->reg_lock);
> > + vop_cfg_done(vop);
> > + spin_unlock(&vop->reg_lock);
> > + rockchip_drm_psr_inhibit_put_state(new_state->state);
> > + }
> > +}
> > +
> > 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 = {
> > --
> > 2.19.0
> >
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> dri-devel mailing list
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> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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