On Thu, Nov 05, 2015 at 05:03:09PM +0200, Jyri Sarha wrote:
Disable planes if they are on to be blanked CRTC and enable them when the CRTC is turned back on by DMPS.
This is desirable on HW that loses its context on blanking. When planes are enabled and disabled with the associated CRTCs, there is no need to restore the plane context in runtime_resume callback.
Signed-off-by: Jyri Sarha jsarha@ti.com
We would need something like this to get rid off OMAPDSS somewhat messy runtime_resume code. How does this look, could this generic solution be refined to be acceptable to mainline, or should we start looking a local solution to omapdrm?
BTW, with this patch the planes are sometimes disabled multiple times. So probably a boolean (or maybe two like on crtc) should be added to drm_plane_state to track and avoid multiple shutdowns.
The recommended way to do this is to call drm_atomic_add_affected_planes from your crtc's atomic_check callback when active_changed is set. This will also take care of enabling all planes again. For disabling we don't yet have a helper yet, but it would be easy to create a drm_atomic_helper_disable_planes(crtc) which just walks over all planes in an atomic update that are currently using the given crtc and disables it using plane_helper_funcs->atomic_disable. That would again require drm_atomic_add_affected_planes to be called first.
This way current helper behaviour is unchanged, but it'd be easy to construct the behaviour you want using helpers with drm_atomic_add_affected_planes called from the crtc->disable hook.
I thought there was an rfc patch somewhere for this, but I can't find it any more.
Cheers, Daniel
drivers/gpu/drm/drm_atomic_helper.c | 19 +++++++++++++++++-- include/drm/drm_atomic_helper.h | 7 +++++++ 2 files changed, 24 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index aecb5d6..92fcaef 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -1994,8 +1994,8 @@ EXPORT_SYMBOL(drm_atomic_helper_page_flip);
- This is the main helper function provided by the atomic helper framework for
- implementing the legacy DPMS connector interface. It computes the new desired
- ->active state for the corresponding CRTC (if the connector is enabled) and
- updates it.
- ->active state for the corresponding CRTC and planes on it (if the connector
- is enabled) and updates it.
- Returns:
- Returns 0 on success, negative errno numbers on failure.
@@ -2008,6 +2008,7 @@ int drm_atomic_helper_connector_dpms(struct drm_connector *connector, struct drm_crtc_state *crtc_state; struct drm_crtc *crtc; struct drm_connector *tmp_connector;
- struct drm_plane *tmp_plane; int ret; bool active = false; int old_mode = connector->dpms;
@@ -2046,6 +2047,20 @@ retry: } crtc_state->active = active;
- /* Collect associated plane states to global state object. */
- list_for_each_entry(tmp_plane, &config->plane_list, head) {
struct drm_plane_state *plane_state;if (tmp_plane->state->crtc != crtc)continue;plane_state = drm_atomic_get_plane_state(state, tmp_plane);if (IS_ERR(plane_state)) {ret = PTR_ERR(plane_state);goto fail;}- }
- ret = drm_atomic_commit(state); if (ret != 0) goto fail;
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h index 11266d14..89c327f 100644 --- a/include/drm/drm_atomic_helper.h +++ b/include/drm/drm_atomic_helper.h @@ -173,6 +173,13 @@ drm_atomic_plane_disabling(struct drm_plane *plane, (plane->state->crtc != NULL && plane->state->fb == NULL));
/*
* If the plane is on a crtc that is not going to be active the plane* it self can be disabled too.*/- if (plane->state->crtc && !plane->state->crtc->state->active)
return true;- /*
- When using the transitional helpers, old_state may be NULL. If so,
- we know nothing about the current state and have to assume that it
- might be enabled.
-- 1.9.1
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