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drm/crtc_helper: replace modeset fail path with something simpler 

- The previous system was not very transparent, nor flexible.
- This is needed to be able to fix a few bugs in the mechanism.

Signed-off-by: Maarten Maathuis <madman2003@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Maarten Maathuis 2009-08-27 10:18:29 +02:00 committed by Dave Airlie
parent 689d7c2a11
commit e67aae79f9
1 changed files with 54 additions and 32 deletions
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86
drivers/gpu/drm/drm_crtc_helper.c
View File

@ -704,13 +704,12 @@ EXPORT_SYMBOL(drm_crtc_helper_set_mode);
int drm_crtc_helper_set_config(struct drm_mode_set *set)
{
struct drm_device *dev;
struct drm_crtc **save_crtcs, *new_crtc;
struct drm_encoder **save_encoders, *new_encoder;
struct drm_crtc *save_crtcs, *new_crtc, *crtc;
struct drm_encoder *save_encoders, *new_encoder, *encoder;
struct drm_framebuffer *old_fb = NULL;
bool save_enabled;
bool mode_changed = false; /* if true do a full mode set */
bool fb_changed = false; /* if true and !mode_changed just do a flip */
struct drm_connector *connector;
struct drm_connector *save_connectors, *connector;
int count = 0, ro, fail = 0;
struct drm_crtc_helper_funcs *crtc_funcs;
int ret = 0;
@ -735,25 +734,47 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
dev = set->crtc->dev;
/* save previous config */
save_enabled = set->crtc->enabled;
/*
* We do mode_config.num_connectors here since we'll look at the
* CRTC and encoder associated with each connector later.
*/
save_crtcs = kzalloc(dev->mode_config.num_connector *
sizeof(struct drm_crtc *), GFP_KERNEL);
/* Allocate space for the backup of all (non-pointer) crtc, encoder and
* connector data. */
save_crtcs = kzalloc(dev->mode_config.num_crtc *
sizeof(struct drm_crtc), GFP_KERNEL);
if (!save_crtcs)
return -ENOMEM;
save_encoders = kzalloc(dev->mode_config.num_connector *
sizeof(struct drm_encoders *), GFP_KERNEL);
save_encoders = kzalloc(dev->mode_config.num_encoder *
sizeof(struct drm_encoder), GFP_KERNEL);
if (!save_encoders) {
kfree(save_crtcs);
return -ENOMEM;
}
save_connectors = kzalloc(dev->mode_config.num_connector *
sizeof(struct drm_connector), GFP_KERNEL);
if (!save_connectors) {
kfree(save_crtcs);
kfree(save_encoders);
return -ENOMEM;
}
/* Copy data. Note that driver private data is not affected.
* Should anything bad happen only the expected state is
* restored, not the drivers personal bookkeeping.
*/
count = 0;
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
save_crtcs[count++] = *crtc;
}
count = 0;
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
save_encoders[count++] = *encoder;
}
count = 0;
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
save_connectors[count++] = *connector;
}
/* 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) {
@ -786,7 +807,6 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
struct drm_connector_helper_funcs *connector_funcs =
connector->helper_private;
save_encoders[count++] = connector->encoder;
new_encoder = connector->encoder;
for (ro = 0; ro < set->num_connectors; ro++) {
if (set->connectors[ro] == connector) {
@ -809,7 +829,7 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
if (fail) {
ret = -EINVAL;
goto fail_no_encoder;
goto fail;
}
count = 0;
@ -817,8 +837,6 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
if (!connector->encoder)
continue;
save_crtcs[count++] = connector->encoder->crtc;
if (connector->encoder->crtc == set->crtc)
new_crtc = NULL;
else
@ -833,7 +851,7 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
if (new_crtc &&
!drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
ret = -EINVAL;
goto fail_set_mode;
goto fail;
}
if (new_crtc != connector->encoder->crtc) {
DRM_DEBUG_KMS("crtc changed, full mode switch\n");
@ -862,7 +880,7 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
DRM_ERROR("failed to set mode on crtc %p\n",
set->crtc);
ret = -EINVAL;
goto fail_set_mode;
goto fail;
}
/* TODO are these needed? */
set->crtc->desired_x = set->x;
@ -877,30 +895,34 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
ret = crtc_funcs->mode_set_base(set->crtc,
set->x, set->y, old_fb);
if (ret != 0)
goto fail_set_mode;
goto fail;
}
kfree(save_connectors);
kfree(save_encoders);
kfree(save_crtcs);
return 0;
fail_set_mode:
set->crtc->enabled = save_enabled;
set->crtc->fb = old_fb;
fail:
/* Restore all previous data. */
count = 0;
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
if (!connector->encoder)
continue;
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
*crtc = save_crtcs[count++];
}
connector->encoder->crtc = save_crtcs[count++];
count = 0;
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
*encoder = save_encoders[count++];
}
fail_no_encoder:
kfree(save_crtcs);
count = 0;
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
connector->encoder = save_encoders[count++];
*connector = save_connectors[count++];
}
kfree(save_connectors);
kfree(save_encoders);
kfree(save_crtcs);
return ret;
}
EXPORT_SYMBOL(drm_crtc_helper_set_config);