On Mon, Oct 10, 2016 at 03:19:47PM +0300, ville.syrjala@xxxxxxxxxxxxxxx wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> We don't want all planes to be added to the state whenever a
> plane with fixed zpos gets enabled/disabled. This is true
> especially for eg. cursor planes on i915, as we want cursor
> updates to go through w/o throttling. Same holds for drivers
> that don't support zpos at all (i915 actually falls into this
> category right now since we've not yet added zpos support).
>
> Allow drivers more freedom by letting them deal with zpos
> themselves instead of doing it in drm_atomic_helper_check_planes()
> unconditionally. Easiest solution seems to be to move the call
> up to drm_atomic_helper_check(). But as some drivers might want
> to use that function without the zpos handling, let's provide
> two variants: the normal one, and one that deals with zpos.
>
> Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> Cc: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx>
> Cc: Vincent Abriou <vincent.abriou@xxxxxx>
> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Cc: Inki Dae <inki.dae@xxxxxxxxxxx>
> Cc: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
> Cc: Seung-Woo Kim <sw0312.kim@xxxxxxxxxxx>
> Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
> Cc: Lyude <cpaul@xxxxxxxxxx>
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: 44d1240d006c ("drm: add generic zpos property")
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Ping. Can I get some buy-in from the relevant folks?
> ---
> drivers/gpu/drm/drm_atomic_helper.c | 46 +++++++++++++++++++++++++++++++---
> drivers/gpu/drm/exynos/exynos_drm_fb.c | 2 +-
> drivers/gpu/drm/rcar-du/rcar_du_kms.c | 2 +-
> drivers/gpu/drm/sti/sti_drv.c | 2 +-
> include/drm/drm_atomic_helper.h | 2 ++
> 5 files changed, 47 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index c3f83476f996..cd19281cdefb 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -594,10 +594,6 @@ drm_atomic_helper_check_planes(struct drm_device *dev,
> struct drm_plane_state *plane_state;
> int i, ret = 0;
>
> - ret = drm_atomic_normalize_zpos(dev, state);
> - if (ret)
> - return ret;
> -
> for_each_plane_in_state(state, plane, plane_state, i) {
> const struct drm_plane_helper_funcs *funcs;
>
> @@ -673,6 +669,48 @@ int drm_atomic_helper_check(struct drm_device *dev,
> }
> EXPORT_SYMBOL(drm_atomic_helper_check);
>
> +/**
> + * drm_atomic_helper_check_with_zpos - validate state object, dealing with zpos
> + * @dev: DRM device
> + * @state: the driver state object
> + *
> + * Check the state object to see if the requested state is physically possible.
> + * Only crtcs and planes have check callbacks, so for any additional (global)
> + * checking that a driver needs it can simply wrap that around this function.
> + * Drivers without such needs can directly use this as their ->atomic_check()
> + * callback.
> + *
> + * This just wraps the two parts of the state checking for planes and modeset
> + * state in the default order: First it calls drm_atomic_helper_check_modeset(),
> + * followed by drm_atomic_normalize_zpos(), and finally
> + * drm_atomic_helper_check_planes(). The assumption is that the
> + * ->atomic_check functions depend upon an updated adjusted_mode.clock to
> + * e.g. properly compute watermarks.
> + *
> + * RETURNS:
> + * Zero for success or -errno
> + */
> +int drm_atomic_helper_check_with_zpos(struct drm_device *dev,
> + struct drm_atomic_state *state)
> +{
> + int ret;
> +
> + ret = drm_atomic_helper_check_modeset(dev, state);
> + if (ret)
> + return ret;
> +
> + ret = drm_atomic_normalize_zpos(dev, state);
> + if (ret)
> + return ret;
> +
> + ret = drm_atomic_helper_check_planes(dev, state);
> + if (ret)
> + return ret;
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(drm_atomic_helper_check_with_zpos);
> +
> static void
> disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
> {
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fb.c b/drivers/gpu/drm/exynos/exynos_drm_fb.c
> index 40ce841eb952..5c0930af01fa 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fb.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fb.c
> @@ -190,7 +190,7 @@ dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index)
> static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
> .fb_create = exynos_user_fb_create,
> .output_poll_changed = exynos_drm_output_poll_changed,
> - .atomic_check = drm_atomic_helper_check,
> + .atomic_check = drm_atomic_helper_check_with_zpos,
> .atomic_commit = exynos_atomic_commit,
> };
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> index bd9c3bb9252c..2cfd35f3f2f6 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> @@ -231,7 +231,7 @@ static int rcar_du_atomic_check(struct drm_device *dev,
> struct rcar_du_device *rcdu = dev->dev_private;
> int ret;
>
> - ret = drm_atomic_helper_check(dev, state);
> + ret = drm_atomic_helper_check_with_zpos(dev, state);
> if (ret < 0)
> return ret;
>
> diff --git a/drivers/gpu/drm/sti/sti_drv.c b/drivers/gpu/drm/sti/sti_drv.c
> index 2784919a7366..df5f150021d0 100644
> --- a/drivers/gpu/drm/sti/sti_drv.c
> +++ b/drivers/gpu/drm/sti/sti_drv.c
> @@ -248,7 +248,7 @@ static void sti_output_poll_changed(struct drm_device *ddev)
> static const struct drm_mode_config_funcs sti_mode_config_funcs = {
> .fb_create = drm_fb_cma_create,
> .output_poll_changed = sti_output_poll_changed,
> - .atomic_check = drm_atomic_helper_check,
> + .atomic_check = drm_atomic_helper_check_with_zpos,
> .atomic_commit = sti_atomic_commit,
> };
>
> diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
> index 7ff92b09fd9c..b1e7193c9d1c 100644
> --- a/include/drm/drm_atomic_helper.h
> +++ b/include/drm/drm_atomic_helper.h
> @@ -40,6 +40,8 @@ int drm_atomic_helper_check_planes(struct drm_device *dev,
> struct drm_atomic_state *state);
> int drm_atomic_helper_check(struct drm_device *dev,
> struct drm_atomic_state *state);
> +int drm_atomic_helper_check_with_zpos(struct drm_device *dev,
> + struct drm_atomic_state *state);
> void drm_atomic_helper_commit_tail(struct drm_atomic_state *state);
> int drm_atomic_helper_commit(struct drm_device *dev,
> struct drm_atomic_state *state,
> --
> 2.7.4
--
Ville Syrjälä
Intel OTC
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