From: Jesse Barnes Date: Mon, 7 Nov 2011 18:39:57 +0000 (-0800) Subject: drm: try to restore previous CRTC config if mode set fails X-Git-Tag: firefly_0821_release~3680^2~4055^2~24 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c5006cfe2f5fc3cc03ebe2342aaca83d051d99e0;p=firefly-linux-kernel-4.4.55.git drm: try to restore previous CRTC config if mode set fails 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 Reviewed-by: Alex Deucher Signed-off-by: Dave Airlie --- diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c index 2957636161e8..3969f7553fe7 100644 --- a/drivers/gpu/drm/drm_crtc_helper.c +++ b/drivers/gpu/drm/drm_crtc_helper.c @@ -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 @@ 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);