On Mon, 2 Jul 2018 12:14:20 +0100
Liviu Dudau <Liviu.Dudau@xxxxxxx> wrote:
> On Mon, Jul 02, 2018 at 11:49:11AM +0200, Boris Brezillon wrote:
> > On Mon, 2 Jul 2018 09:51:46 +0200
> > Daniel Vetter <daniel@xxxxxxxx> wrote:
> >
> > > On Fri, Jun 29, 2018 at 12:37:10PM +0100, Liviu Dudau wrote:
> > > > On Fri, Jun 29, 2018 at 01:17:15PM +0200, Boris Brezillon wrote:
> > > > > Other atomic hooks are passed state objects, let's change this one to
> > > > > be consistent.
> > > > >
> > > > > Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxx>
> > > > > ---
> > > > > drivers/gpu/drm/drm_atomic_helper.c | 2 +-
> > > > > include/drm/drm_modeset_helper_vtables.h | 4 +++-
> > > > > 2 files changed, 4 insertions(+), 2 deletions(-)
> > > > >
> > > > > diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> > > > > index 17baf5057132..69063bcf2334 100644
> > > > > --- a/drivers/gpu/drm/drm_atomic_helper.c
> > > > > +++ b/drivers/gpu/drm/drm_atomic_helper.c
> > > > > @@ -1187,7 +1187,7 @@ static void drm_atomic_helper_commit_writebacks(struct drm_device *dev,
> > > > >
> > > > > if (new_conn_state->writeback_job && new_conn_state->writeback_job->fb) {
> > > > > WARN_ON(connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK);
> > > > > - funcs->atomic_commit(connector, new_conn_state->writeback_job);
> > > > > + funcs->atomic_commit(connector, new_conn_state);
> > > >
> > > > Forgot to add: I think it is worth adding a check here that the hook has
> > > > been implemented by the driver, AFAIK it is not a mandatory hook, even
> > > > for writeback enabled drivers.
> >
> > I'm just curious, from where do you queue the writeback job if you don't
> > have a connector->atomic_commit() hook implemented? AFAICT, the
> > encoder->enable() method is only called when the encoder is being
> > enabled, and not every time you update the FB_ID prop of the writeback
> > connector. Am I missing something?
>
> In malidp_drv.c:malidp_atomic_commit_tail() we call
> malidp_mw_atomic_commit() after drm_atomic_helper_commit_planes(drm,
> state, DRM_PLANE_COMMIT_ACTIVE_ONLY).
>
> malidp_mw_atomic_commit() then checks the writeback job and if it has an
> fb associated with it then it calls drm_writeback_queue_job() before
> enabling the memwrite hardware bits.
Okay. That's a good reason to make it optional.
Thanks,
Boris
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