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

[Laurent Pinchart]

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 ?

> ---
>  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