[PATCH 14/65] drm/rcar-du: Annotate dma-fence critical section in commit path

[Daniel Vetter]

On Wed, Dec 16, 2020 at 2:29 AM Laurent Pinchart
<laurent.pinchart at ideasonboard.com> wrote:
>
> Hi Daniel,
>
> Thank you for the patch.
>
> On Fri, Oct 23, 2020 at 02:21:25PM +0200, Daniel Vetter wrote:
> > Ends right after drm_atomic_helper_commit_hw_done(), absolutely
> > nothing fancy going on here.
> >
> > Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
> > Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> > Cc: Kieran Bingham <kieran.bingham+renesas at ideasonboard.com>
> > Cc: linux-renesas-soc at vger.kernel.org
>
> I'm lacking context here, there's only one instance of a call to
> dma_fence_begin_signalling() in the subsystem, and no cover letter in
> the series to explain what's going on. Some information would help
> reviewing the patch :-)
>
> Also, could you mention in the cover letter for the next version if you
> will merge the whole series, or expect individual maintainers to pick up
> the relevant patches ?

This series was a misfire of git send-email. I figured that following
up to 65 patches with "I'm sorry" doesn't help the spam problem, so I
only did it once.

This patch was part of a proper series half a year ago, with cover
letter and everything, and a few patches from that series have landed.
I've planed to resubmit this all this week again.
-Daniel

>
> > ---
> >  drivers/gpu/drm/rcar-du/rcar_du_kms.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> > index 72dda446355f..8d91140151cc 100644
> > --- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> > +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> > @@ -441,6 +441,7 @@ static void rcar_du_atomic_commit_tail(struct drm_atomic_state *old_state)
> >       struct drm_crtc_state *crtc_state;
> >       struct drm_crtc *crtc;
> >       unsigned int i;
> > +     bool fence_cookie = dma_fence_begin_signalling();
> >
> >       /*
> >        * Store RGB routing to DPAD0 and DPAD1, the hardware will be configured
> > @@ -467,6 +468,7 @@ static void rcar_du_atomic_commit_tail(struct drm_atomic_state *old_state)
> >       drm_atomic_helper_commit_modeset_enables(dev, old_state);
> >
> >       drm_atomic_helper_commit_hw_done(old_state);
> > +     dma_fence_end_signalling(fence_cookie);
> >       drm_atomic_helper_wait_for_flip_done(dev, old_state);
> >
> >       drm_atomic_helper_cleanup_planes(dev, old_state);
>
> --
> Regards,
>
> Laurent Pinchart



-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch