On Mon, Jul 13, 2015 at 08:21:32AM +0800, John Hunter wrote:
> From: Zhao Junwang <zhjwpku@xxxxxxxxx>
A bit of text to motivate this would be good - i.e. why is this useful,
how did it blow up in the bochs conversion?
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Signed-off-by: Zhao Junwang <zhjwpku@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_atomic_helper.c | 55 +++++++++++++++++++++++++++++++++++
> include/drm/drm_atomic_helper.h | 7 +++++
> 2 files changed, 62 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index 536ae4d..3d94ff8 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -1336,6 +1336,61 @@ void drm_atomic_helper_swap_state(struct drm_device *dev,
> EXPORT_SYMBOL(drm_atomic_helper_swap_state);
>
> /**
> + * drm_atomic_helper_plane_check_update
> + * @plane: plane object to update
> + * @state: drm plane state
> + * @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point
> + * @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point
> + * @can_position: is it legal to position the plane such that it
> + * doesn't cover the entire crtc? This will generally
> + * only be false for primary planes.
> + * @can_update_disabled: can the plane be updated while the crtc
> + * is disabled?
> + *
> + * Provide a default plane check update handler
It's not a default handler since the signatures don't match. Also I think
we should mention the legacy plane helper function here too. What about
This provides a helper to be used in a driver's plane atomic_check
callback. It is the atomic equivalent of
drm_plane_helper_check_update() and has the exact same semantics,
except that it looks at the atomit CRTC state in the atomic update
instead of legacy state directly embedded in struct &drm_crtc.
Also adding a comment to drm_plane_helper_check_update's kerneldoc would
be good, like this:
Note: When converting over to atomic drivers you need to switch
over to using drm_atomic_helper_plane_check_update() since only
that correctly checks atomic state - this function here only looks
at legacy state and hence will check against stale values in
atomic updates.
> + *
> + * RETURNS:
> + * Zero on success, error code on failure
> + */
> +int drm_atomic_helper_plane_check_update(struct drm_plane *plane,
> + struct drm_plane_state *state,
> + int min_scale,
> + int max_scale,
> + bool can_position,
> + bool can_update_disabled,
> + bool *visible)
> +{
> + struct drm_crtc *crtc = state->crtc;
> + struct drm_framebuffer *fb = state->fb;
> +
> + if (!fb)
> + return 0;
> +
> + struct drm_rect src = {
> + .x1 = state->src_x,
> + .y1 = state->src_y,
> + .x2 = state->src_x + state->src_w,
> + .y2 = state->src_y + state->src_h,
> + };
> + struct drm_rect dest = {
> + .x1 = state->crtc_x,
> + .y1 = state->crtc_y,
> + .x2 = state->crtc_x + state->crtc_w,
> + .y2 = state->crtc_y + state->crtc_h,
> + };
> + const struct drm_rect clip = {
> + .x2 = crtc->mode.hdisplay,
> + .y2 = crtc->mode.vdisplay,
crtc->mode is legacy state - we need to look at crtc_state here instead.
> + };
> +
> + return drm_plane_helper_check_update(plane, crtc, fb,
> + &src, &dest, &clip,
> + min_scale, max_scale,
> + can_position, can_update_disabled, visible);
This looks at crtc->enabled (which is also legacy state) for
can_update_disabled. If we want to reuse this function we need to check
can_updated_disabled here and it unconditionally to true when calling the
plane helpers.
Cheers, Daniel
> +}
> +EXPORT_SYMBOL(drm_atomic_helper_plane_check_update);
> +
> +/**
> * drm_atomic_helper_update_plane - Helper for primary plane update using atomic
> * @plane: plane object to update
> * @crtc: owning CRTC of owning plane
> diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
> index cc1fee8..5305a01 100644
> --- a/include/drm/drm_atomic_helper.h
> +++ b/include/drm/drm_atomic_helper.h
> @@ -64,6 +64,13 @@ void drm_atomic_helper_swap_state(struct drm_device *dev,
> struct drm_atomic_state *state);
>
> /* implementations for legacy interfaces */
> +int drm_atomic_helper_plane_check_update(struct drm_plane *plane,
> + struct drm_plane_state *state,
> + int min_scale,
> + int max_scale,
> + bool can_position,
> + bool can_update_disabled,
> + bool *visible);
> int drm_atomic_helper_update_plane(struct drm_plane *plane,
> struct drm_crtc *crtc,
> struct drm_framebuffer *fb,
> --
> 1.7.10.4
>
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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