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path: root/drivers/gpu/drm/drm_crtc_helper.c
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Diffstat (limited to 'drivers/gpu/drm/drm_crtc_helper.c')
-rw-r--r--drivers/gpu/drm/drm_crtc_helper.c40
1 files changed, 38 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index ccbdc0b5854..42f86e71479 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -457,6 +457,30 @@ done:
EXPORT_SYMBOL(drm_crtc_helper_set_mode);
+static int
+drm_crtc_helper_disable(struct drm_crtc *crtc)
+{
+ struct drm_device *dev = crtc->dev;
+ struct drm_connector *connector;
+ struct drm_encoder *encoder;
+
+ /* Decouple all encoders and their attached connectors from this crtc */
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+ if (encoder->crtc != crtc)
+ continue;
+
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+ if (connector->encoder != encoder)
+ continue;
+
+ connector->encoder = NULL;
+ }
+ }
+
+ drm_helper_disable_unused_functions(dev);
+ return 0;
+}
+
/**
* drm_crtc_helper_set_config - set a new config from userspace
* @crtc: CRTC to setup
@@ -485,6 +509,7 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
struct drm_connector *save_connectors, *connector;
int count = 0, ro, fail = 0;
struct drm_crtc_helper_funcs *crtc_funcs;
+ struct drm_mode_set save_set;
int ret = 0;
int i;
@@ -510,8 +535,7 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
(int)set->num_connectors, set->x, set->y);
} else {
DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
- set->mode = NULL;
- set->num_connectors = 0;
+ return drm_crtc_helper_disable(set->crtc);
}
dev = set->crtc->dev;
@@ -557,6 +581,12 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
save_connectors[count++] = *connector;
}
+ save_set.crtc = set->crtc;
+ save_set.mode = &set->crtc->mode;
+ save_set.x = set->crtc->x;
+ save_set.y = set->crtc->y;
+ save_set.fb = set->crtc->fb;
+
/* We should be able to check here if the fb has the same properties
* and then just flip_or_move it */
if (set->crtc->fb != set->fb) {
@@ -722,6 +752,12 @@ fail:
*connector = save_connectors[count++];
}
+ /* Try to restore the config */
+ if (mode_changed &&
+ !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
+ save_set.y, save_set.fb))
+ DRM_ERROR("failed to restore config after modeset failure\n");
+
kfree(save_connectors);
kfree(save_encoders);
kfree(save_crtcs);