[Intel-gfx] [PATCH 13/65] drm/omapdrm: Annotate dma-fence critical section in commit path

[Tomi Valkeinen]

On 23/10/2020 15:21, Daniel Vetter wrote:
> Nothing special, just put the end right after hw_done(). Note that in
> one path there's a wait for the flip/update to complete. But as far as
> I understand from comments and code that's only relevant for modesets,
> and skipped if there wasn't a modeset done on a given crtc.
> 
> For a bit more clarity pull the hw_done() call out of the if/else,
> that way it's a bit clearer flow. But happy to shuffle this around as
> is seen fit.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
> Cc: Tomi Valkeinen <tomi.valkeinen at ti.com>
> ---
>  drivers/gpu/drm/omapdrm/omap_drv.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
> index 2e598b8b72af..2b82a708eca6 100644
> --- a/drivers/gpu/drm/omapdrm/omap_drv.c
> +++ b/drivers/gpu/drm/omapdrm/omap_drv.c
> @@ -68,6 +68,7 @@ static void omap_atomic_commit_tail(struct drm_atomic_state *old_state)
>  {
>  	struct drm_device *dev = old_state->dev;
>  	struct omap_drm_private *priv = dev->dev_private;
> +	bool fence_cookie = dma_fence_begin_signalling();
>  
>  	priv->dispc_ops->runtime_get(priv->dispc);
>  
> @@ -90,8 +91,6 @@ static void omap_atomic_commit_tail(struct drm_atomic_state *old_state)
>  		omap_atomic_wait_for_completion(dev, old_state);
>  
>  		drm_atomic_helper_commit_planes(dev, old_state, 0);
> -
> -		drm_atomic_helper_commit_hw_done(old_state);
>  	} else {
>  		/*
>  		 * OMAP3 DSS seems to have issues with the work-around above,
> @@ -101,10 +100,12 @@ static void omap_atomic_commit_tail(struct drm_atomic_state *old_state)
>  		drm_atomic_helper_commit_planes(dev, old_state, 0);
>  
>  		drm_atomic_helper_commit_modeset_enables(dev, old_state);
> -
> -		drm_atomic_helper_commit_hw_done(old_state);
>  	}
>  
> +	drm_atomic_helper_commit_hw_done(old_state);
> +
> +	dma_fence_end_signalling(fence_cookie);
> +
>  	/*
>  	 * Wait for completion of the page flips to ensure that old buffers
>  	 * can't be touched by the hardware anymore before cleaning up planes.
> 

Reviewed-by: Tomi Valkeinen <tomi.valkeinen at ti.com>

 Tomi

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