On Tue, Jul 07, 2015 at 08:43:03AM +0200, Daniel Vetter wrote:
> The legacy page_flip driver entry point is the only one left which
> requires drivers to update plane->fb themselves. All the other entry
> hooks will patch things up for the driver as needed since no one seems
> to reliable get this right, see e.g. drm_mode_set_config_internal or
> the plane->fb/old_fb handling in drm_mode_atomic_ioctl.
>
> Therefore unify things, which allows us to ditch a TODO from
> drm_atomic_helper_page_flip.
>
> This should also help the atomic transition in i915 since we keep a
> bit of legacy cruft only around because of this special behaviour in
> ->page_flip.
>
> Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
> Signed-off-by: Daniel Vetter <daniel.vet...@intel.com>
Applied with Maarten's irc r-b to drm-misc.
-Daniel
> ---
> drivers/gpu/drm/drm_atomic_helper.c | 4 ----
> drivers/gpu/drm/drm_crtc.c | 8 +-------
> 2 files changed, 1 insertion(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c
> b/drivers/gpu/drm/drm_atomic_helper.c
> index 5b59d5ad7d1c..0898afbc9e23 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -1915,10 +1915,6 @@ retry:
> if (ret != 0)
> goto fail;
>
> - /* TODO: ->page_flip is the only driver callback where the core
> - * doesn't update plane->fb. For now patch it up here. */
> - plane->fb = plane->state->fb;
> -
> /* Driver takes ownership of state on successful async commit. */
> return 0;
> fail:
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index d15a96fdff43..ee0b3bf166b6 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -5345,13 +5345,7 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
> /* Keep the old fb, don't unref it. */
> crtc->primary->old_fb = NULL;
> } else {
> - /*
> - * Warn if the driver hasn't properly updated the crtc->fb
> - * field to reflect that the new framebuffer is now used.
> - * Failing to do so will screw with the reference counting
> - * on framebuffers.
> - */
> - WARN_ON(crtc->primary->fb != fb);
> + crtc->primary->fb = fb;
> /* Unref only the old framebuffer. */
> fb = NULL;
> }
> --
> 2.1.4
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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