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drm: try to restore previous CRTC config if mode set fails

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We restore the CRTC, encoder, and connector configurations, but if the
mode set failed, the attached display may have been turned off, so we
need to try set_config again to restore things to the way they were.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Jesse Barnes 2011-11-07 10:39:57 -08:00 committed by Dave Airlie
parent 091264f0bc
commit c5006cfe2f
1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/drm_crtc_helper.c
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@ -484,6 +484,7 @@ 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;
@ -556,6 +557,12 @@ 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) {
@ -721,6 +728,12 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
*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);