From 1592364de3912dad264262f4bcc61552984c9523 Mon Sep 17 00:00:00 2001 From: Maarten Lankhorst Date: Wed, 25 Jan 2017 12:30:47 +0100 Subject: [PATCH] drm: Resurrect atomic rmfb code, v3 This was somehow lost between v3 and the merged version in Maarten's patch merged as: commit f2d580b9a8149735cbc4b59c4a8df60173658140 Author: Maarten Lankhorst Date: Wed May 4 14:38:26 2016 +0200 drm/core: Do not preserve framebuffer on rmfb, v4. This introduces a slight behavioral change to rmfb. Instead of disabling a crtc when the primary plane is disabled, we try to preserve it. Apart from old versions of the vmwgfx xorg driver, there is nothing depending on rmfb disabling a crtc. Since vmwgfx is a legacy driver we can safely only disable the plane with atomic. If this commit is rejected by the driver then we will still fall back to the old behavior and turn off the crtc. v2: - Remove plane->fb assignment, done by drm_atomic_clean_old_fb. - Add WARN_ON when atomic_remove_fb fails. - Always call drm_atomic_state_put. v3: - Use drm_drv_uses_atomic_modeset - Handle the case where the first plane-disable-only commit fails with -EINVAL. Some drivers do not support this, fall back to disabling all crtc's in this case. Signed-off-by: Daniel Vetter Signed-off-by: Daniel Vetter Signed-off-by: Maarten Lankhorst Signed-off-by: Jani Nikula Link: http://patchwork.freedesktop.org/patch/msgid/66fc3da5-697b-1613-0a67-a5293209f0dc@linux.intel.com --- drivers/gpu/drm/drm_atomic.c | 106 ++++++++++++++++++++++++++++ drivers/gpu/drm/drm_crtc_internal.h | 1 + drivers/gpu/drm/drm_framebuffer.c | 7 ++ 3 files changed, 114 insertions(+) diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index c97588a28216..11f102e7ddfd 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -2046,6 +2046,112 @@ static void complete_crtc_signaling(struct drm_device *dev, kfree(fence_state); } +int drm_atomic_remove_fb(struct drm_framebuffer *fb) +{ + struct drm_modeset_acquire_ctx ctx; + struct drm_device *dev = fb->dev; + struct drm_atomic_state *state; + struct drm_plane *plane; + struct drm_connector *conn; + struct drm_connector_state *conn_state; + int i, ret = 0; + unsigned plane_mask, disable_crtcs = false; + + state = drm_atomic_state_alloc(dev); + if (!state) + return -ENOMEM; + + drm_modeset_acquire_init(&ctx, 0); + state->acquire_ctx = &ctx; + +retry: + plane_mask = 0; + ret = drm_modeset_lock_all_ctx(dev, &ctx); + if (ret) + goto unlock; + + drm_for_each_plane(plane, dev) { + struct drm_plane_state *plane_state; + + if (plane->state->fb != fb) + continue; + + plane_state = drm_atomic_get_plane_state(state, plane); + if (IS_ERR(plane_state)) { + ret = PTR_ERR(plane_state); + goto unlock; + } + + /* + * Some drivers do not support keeping crtc active with the + * primary plane disabled. If we fail to commit with -EINVAL + * then we will try to perform the same commit but with all + * crtc's disabled for primary planes as well. + */ + if (disable_crtcs && plane_state->crtc->primary == plane) { + struct drm_crtc_state *crtc_state; + + crtc_state = drm_atomic_get_existing_crtc_state(state, plane_state->crtc); + + ret = drm_atomic_add_affected_connectors(state, plane_state->crtc); + if (ret) + goto unlock; + + crtc_state->active = false; + ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL); + if (ret) + goto unlock; + } + + drm_atomic_set_fb_for_plane(plane_state, NULL); + ret = drm_atomic_set_crtc_for_plane(plane_state, NULL); + if (ret) + goto unlock; + + plane_mask |= BIT(drm_plane_index(plane)); + + plane->old_fb = plane->fb; + } + + /* This list is only not empty when disable_crtcs is set. */ + for_each_connector_in_state(state, conn, conn_state, i) { + ret = drm_atomic_set_crtc_for_connector(conn_state, NULL); + + if (ret) + goto unlock; + } + + if (plane_mask) + ret = drm_atomic_commit(state); + +unlock: + if (plane_mask) + drm_atomic_clean_old_fb(dev, plane_mask, ret); + + if (ret == -EDEADLK) { + drm_modeset_backoff(&ctx); + goto retry; + } + + drm_atomic_state_put(state); + + if (ret == -EINVAL && !disable_crtcs) { + disable_crtcs = true; + + state = drm_atomic_state_alloc(dev); + if (state) { + state->acquire_ctx = &ctx; + goto retry; + } + ret = -ENOMEM; + } + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); + + return ret; +} + int drm_mode_atomic_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h index 955c5690bf64..e0678f8a51cf 100644 --- a/drivers/gpu/drm/drm_crtc_internal.h +++ b/drivers/gpu/drm/drm_crtc_internal.h @@ -183,6 +183,7 @@ int drm_atomic_get_property(struct drm_mode_object *obj, struct drm_property *property, uint64_t *val); int drm_mode_atomic_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv); +int drm_atomic_remove_fb(struct drm_framebuffer *fb); /* drm_plane.c */ diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c index 28a0108a1ab8..c0e593a7f9b4 100644 --- a/drivers/gpu/drm/drm_framebuffer.c +++ b/drivers/gpu/drm/drm_framebuffer.c @@ -773,6 +773,12 @@ void drm_framebuffer_remove(struct drm_framebuffer *fb) * in this manner. */ if (drm_framebuffer_read_refcount(fb) > 1) { + if (drm_drv_uses_atomic_modeset(dev)) { + int ret = drm_atomic_remove_fb(fb); + WARN(ret, "atomic remove_fb failed with %i\n", ret); + goto out; + } + drm_modeset_lock_all(dev); /* remove from any CRTC */ drm_for_each_crtc(crtc, dev) { @@ -790,6 +796,7 @@ void drm_framebuffer_remove(struct drm_framebuffer *fb) drm_modeset_unlock_all(dev); } +out: drm_framebuffer_unreference(fb); } EXPORT_SYMBOL(drm_framebuffer_remove); -- 2.20.1