On Mon, Nov 7, 2011 at 1:39 PM, Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx> wrote:
> 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@xxxxxxxxxxxxxxxx>
Reviewed-by: Alex Deucher <alexdeucher@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_crtc_helper.c | 13 +++++++++++++
> 1 files changed, 13 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
> index f88a9b2..edaf903 100644
> --- a/drivers/gpu/drm/drm_crtc_helper.c
> +++ b/drivers/gpu/drm/drm_crtc_helper.c
> @@ -479,6 +479,7 @@ 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;
>
> @@ -551,6 +552,12 @@ 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) {
> @@ -716,6 +723,12 @@ 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);
> --
> 1.7.4.1
>
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>
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