Commit f869a6ec authored by Andrey Grodzovsky's avatar Andrey Grodzovsky Committed by Daniel Vetter
Browse files

drm/atomic: Add target_vblank support in atomic helpers (v2) 



Allows usage of the new page_flip_target hook for drivers implementing
the atomic path.
Provides default atomic helper for the new hook.

v2:
Update code sharing logic between exsiting and the new flip hooks.
Improve kerneldoc.

Signed-off-by: default avatarAndrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Acked-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1483735180-4173-1-git-send-email-Andrey.Grodzovsky@amd.com
parent fd056f05

drivers/gpu/drm/drm_atomic_helper.c

+112 −21
Original line number Diff line number Diff line
@@ -2706,6 +2706,44 @@ backoff: 
}

EXPORT_SYMBOL(drm_atomic_helper_connector_set_property);



static int page_flip_common(

				struct drm_atomic_state *state,

				struct drm_crtc *crtc,

				struct drm_framebuffer *fb,

				struct drm_pending_vblank_event *event)

{

	struct drm_plane *plane = crtc->primary;

	struct drm_plane_state *plane_state;

	struct drm_crtc_state *crtc_state;

	int ret = 0;



	crtc_state = drm_atomic_get_crtc_state(state, crtc);

	if (IS_ERR(crtc_state))

		return PTR_ERR(crtc_state);



	crtc_state->event = event;



	plane_state = drm_atomic_get_plane_state(state, plane);

	if (IS_ERR(plane_state))

		return PTR_ERR(plane_state);





	ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);

	if (ret != 0)

		return ret;

	drm_atomic_set_fb_for_plane(plane_state, fb);



	/* Make sure we don't accidentally do a full modeset. */

	state->allow_modeset = false;

	if (!crtc_state->active) {

		DRM_DEBUG_ATOMIC("[CRTC:%d] disabled, rejecting legacy flip\n",

				 crtc->base.id);

		return -EINVAL;

	}



	return ret;

}



/**

 * drm_atomic_helper_page_flip - execute a legacy page flip

 * @crtc: DRM crtc
@@ -2713,7 +2751,8 @@ EXPORT_SYMBOL(drm_atomic_helper_connector_set_property); 
 * @event: optional DRM event to signal upon completion

 * @flags: flip flags for non-vblank sync'ed updates

 *

 * Provides a default page flip implementation using the atomic driver interface.

 * Provides a default &drm_crtc_funcs.page_flip implementation

 * using the atomic driver interface.

 *

 * Note that for now so called async page flips (i.e. updates which are not

 * synchronized to vblank) are not supported, since the atomic interfaces have
@@ -2721,6 +2760,9 @@ EXPORT_SYMBOL(drm_atomic_helper_connector_set_property); 
 *

 * Returns:

 * Returns 0 on success, negative errno numbers on failure.

 *

 * See also:

 * drm_atomic_helper_page_flip_target()

 */

int drm_atomic_helper_page_flip(struct drm_crtc *crtc,

				struct drm_framebuffer *fb,
@@ -2729,8 +2771,6 @@ int drm_atomic_helper_page_flip(struct drm_crtc *crtc, 
{

	struct drm_plane *plane = crtc->primary;

	struct drm_atomic_state *state;

	struct drm_plane_state *plane_state;

	struct drm_crtc_state *crtc_state;

	int ret = 0;



	if (flags & DRM_MODE_PAGE_FLIP_ASYNC)
@@ -2741,35 +2781,86 @@ int drm_atomic_helper_page_flip(struct drm_crtc *crtc, 
		return -ENOMEM;



	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);



retry:

	crtc_state = drm_atomic_get_crtc_state(state, crtc);

	if (IS_ERR(crtc_state)) {

		ret = PTR_ERR(crtc_state);

	ret = page_flip_common(state, crtc, fb, event);

	if (ret != 0)

		goto fail;

	}

	crtc_state->event = event;



	plane_state = drm_atomic_get_plane_state(state, plane);

	if (IS_ERR(plane_state)) {

		ret = PTR_ERR(plane_state);

		goto fail;

	ret = drm_atomic_nonblocking_commit(state);



fail:

	if (ret == -EDEADLK)

		goto backoff;



	drm_atomic_state_put(state);

	return ret;



backoff:

	drm_atomic_state_clear(state);

	drm_atomic_legacy_backoff(state);



	/*

	 * Someone might have exchanged the framebuffer while we dropped locks

	 * in the backoff code. We need to fix up the fb refcount tracking the

	 * core does for us.

	 */

	plane->old_fb = plane->fb;



	goto retry;

}

EXPORT_SYMBOL(drm_atomic_helper_page_flip);



	ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);

/**

 * drm_atomic_helper_page_flip_target - do page flip on target vblank period.

 * @crtc: DRM crtc

 * @fb: DRM framebuffer

 * @event: optional DRM event to signal upon completion

 * @flags: flip flags for non-vblank sync'ed updates

 * @target: specifying the target vblank period when the flip to take effect

 *

 * Provides a default &drm_crtc_funcs.page_flip_target implementation.

 * Similar to drm_atomic_helper_page_flip() with extra parameter to specify

 * target vblank period to flip.

 *

 * Returns:

 * Returns 0 on success, negative errno numbers on failure.

 */

int drm_atomic_helper_page_flip_target(

				struct drm_crtc *crtc,

				struct drm_framebuffer *fb,

				struct drm_pending_vblank_event *event,

				uint32_t flags,

				uint32_t target)

{

	struct drm_plane *plane = crtc->primary;

	struct drm_atomic_state *state;

	struct drm_crtc_state *crtc_state;

	int ret = 0;



	if (flags & DRM_MODE_PAGE_FLIP_ASYNC)

		return -EINVAL;



	state = drm_atomic_state_alloc(plane->dev);

	if (!state)

		return -ENOMEM;



	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);



retry:

	ret = page_flip_common(state, crtc, fb, event);

	if (ret != 0)

		goto fail;

	drm_atomic_set_fb_for_plane(plane_state, fb);



	/* Make sure we don't accidentally do a full modeset. */

	state->allow_modeset = false;

	if (!crtc_state->active) {

		DRM_DEBUG_ATOMIC("[CRTC:%d] disabled, rejecting legacy flip\n",

				 crtc->base.id);

	crtc_state = drm_atomic_get_existing_crtc_state(state, crtc);

	if (WARN_ON(!crtc_state)) {

		ret = -EINVAL;

		goto fail;

	}

	crtc_state->target_vblank = target;



	ret = drm_atomic_nonblocking_commit(state);



fail:

	if (ret == -EDEADLK)

		goto backoff;
@@ -2790,7 +2881,7 @@ backoff: 


	goto retry;

}

EXPORT_SYMBOL(drm_atomic_helper_page_flip);

EXPORT_SYMBOL(drm_atomic_helper_page_flip_target);



/**

 * drm_atomic_helper_connector_dpms() - connector dpms helper implementation

include/drm/drm_atomic_helper.h

+6 −0
Original line number Diff line number Diff line
@@ -121,6 +121,12 @@ int drm_atomic_helper_page_flip(struct drm_crtc *crtc, 
				struct drm_framebuffer *fb,

				struct drm_pending_vblank_event *event,

				uint32_t flags);

int drm_atomic_helper_page_flip_target(

				struct drm_crtc *crtc,

				struct drm_framebuffer *fb,

				struct drm_pending_vblank_event *event,

				uint32_t flags,

				uint32_t target);

int drm_atomic_helper_connector_dpms(struct drm_connector *connector,

				     int mode);

struct drm_encoder *

include/drm/drm_crtc.h

+9 −0
Original line number Diff line number Diff line
@@ -148,6 +148,15 @@ struct drm_crtc_state { 
	struct drm_property_blob *ctm;

	struct drm_property_blob *gamma_lut;



	/**

	 * @target_vblank:

	 *

	 * Target vertical blank period when a page flip

	 * should take effect.

	 */



	u32 target_vblank;



	/**

	 * @event:

	 *

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