Re: [PATCH 1/5] drm/i915: Merge of visible and !visible paths for primary planes

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Thu, Sep 18, 2014 at 04:43:12PM -0300, Gustavo Padovan wrote:
> From: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
> 
> Fold intel_pipe_set_base() in the update primary plane path merging
> pieces of code that are common to both paths.
> 
> Basically the the pin/unpin procedures are the same for both paths
> and some checks can also be shared (some of the were moved to the
> check() stage)
> 
> v2: take Ville's comments:
> 	- remove unnecessary plane check
> 	- move mutex lock to inside the conditional
> 	- make the pin fail message a debug one
> 	- add a fixme for the fastboot hack
> 	- call intel_frontbuffer_flip() after FBC update
> 
> v3: take more Ville's comments:
> 	- fold update code under if (intel_crtc->active), and do the
> 	visible/!visible split inside.
> 	- check ret inside the same conditional we assign it
> 
> v4: don't use intel_enable_primary_hw_plane(), the primary_enabled
> check inside will break page flips
> 
> Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 141 +++++++++++++++++++++--------------
>  1 file changed, 84 insertions(+), 57 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 5b05ddb..1fd9b70 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -11792,12 +11792,23 @@ intel_check_primary_plane(struct drm_plane *plane,
>  	struct drm_rect *dest = &state->dst;
>  	struct drm_rect *src = &state->src;
>  	const struct drm_rect *clip = &state->clip;
> +	int ret;
>  
> -	return drm_plane_helper_check_update(plane, crtc, fb,
> +	ret = drm_plane_helper_check_update(plane, crtc, fb,
>  					    src, dest, clip,
>  					    DRM_PLANE_HELPER_NO_SCALING,
>  					    DRM_PLANE_HELPER_NO_SCALING,
>  					    false, true, &state->visible);
> +	if (ret)
> +		return ret;
> +
> +	/* no fb bound */
> +	if (state->visible && !fb) {
> +		DRM_ERROR("No FB bound\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
>  }
>  
>  static int
> @@ -11809,6 +11820,8 @@ intel_commit_primary_plane(struct drm_plane *plane,
>  	struct drm_device *dev = crtc->dev;
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +	enum pipe pipe = intel_crtc->pipe;
> +	struct drm_framebuffer *old_fb = plane->fb;
>  	struct drm_i915_gem_object *obj = intel_fb_obj(fb);
>  	struct drm_i915_gem_object *old_obj = intel_fb_obj(plane->fb);
>  	struct intel_plane *intel_plane = to_intel_plane(plane);
> @@ -11817,67 +11830,28 @@ intel_commit_primary_plane(struct drm_plane *plane,
>  
>  	intel_crtc_wait_for_pending_flips(crtc);
>  
> -	/*
> -	 * If clipping results in a non-visible primary plane, we'll disable
> -	 * the primary plane.  Note that this is a bit different than what
> -	 * happens if userspace explicitly disables the plane by passing fb=0
> -	 * because plane->fb still gets set and pinned.
> -	 */
> -	if (!state->visible) {
> -		mutex_lock(&dev->struct_mutex);
> -
> -		/*
> -		 * Try to pin the new fb first so that we can bail out if we
> -		 * fail.
> -		 */
> -		if (plane->fb != fb) {
> -			ret = intel_pin_and_fence_fb_obj(dev, obj, NULL);
> -			if (ret) {
> -				mutex_unlock(&dev->struct_mutex);
> -				return ret;
> -			}
> -		}
> -
> -		i915_gem_track_fb(old_obj, obj,
> -				  INTEL_FRONTBUFFER_PRIMARY(intel_crtc->pipe));
> -
> -		if (intel_crtc->primary_enabled)
> -			intel_disable_primary_hw_plane(plane, crtc);
> -
> -
> -		if (plane->fb != fb)
> -			if (plane->fb)
> -				intel_unpin_fb_obj(old_obj);
> +	if (intel_crtc_has_pending_flip(crtc)) {
> +		DRM_ERROR("pipe is still busy with an old pageflip\n");
> +		return -EBUSY;
> +	}
>  
> +	if (plane->fb != fb) {
> +		mutex_lock(&dev->struct_mutex);
> +		ret = intel_pin_and_fence_fb_obj(dev, obj, NULL);
> +		if (ret == 0)
> +			i915_gem_track_fb(old_obj, obj,
> +					  INTEL_FRONTBUFFER_PRIMARY(pipe));
>  		mutex_unlock(&dev->struct_mutex);
> -
> -	} else {
> -		if (intel_crtc && intel_crtc->active &&
> -		    intel_crtc->primary_enabled) {
> -			/*
> -			 * FBC does not work on some platforms for rotated
> -			 * planes, so disable it when rotation is not 0 and
> -			 * update it when rotation is set back to 0.
> -			 *
> -			 * FIXME: This is redundant with the fbc update done in
> -			 * the primary plane enable function except that that
> -			 * one is done too late. We eventually need to unify
> -			 * this.
> -			 */
> -			if (INTEL_INFO(dev)->gen <= 4 && !IS_G4X(dev) &&
> -			    dev_priv->fbc.plane == intel_crtc->plane &&
> -			    intel_plane->rotation != BIT(DRM_ROTATE_0)) {
> -				intel_disable_fbc(dev);
> -			}
> -		}
> -		ret = intel_pipe_set_base(crtc, src->x1, src->y1, fb);
> -		if (ret)
> +		if (ret != 0) {
> +			DRM_DEBUG_KMS("pin & fence failed\n");
>  			return ret;
> -
> -		if (!intel_crtc->primary_enabled)
> -			intel_enable_primary_hw_plane(plane, crtc);
> +		}
>  	}
>  
> +	crtc->primary->fb = fb;
> +	crtc->x = src->x1;
> +	crtc->y = src->y1;
> +
>  	intel_plane->crtc_x = state->orig_dst.x1;
>  	intel_plane->crtc_y = state->orig_dst.y1;
>  	intel_plane->crtc_w = drm_rect_width(&state->orig_dst);
> @@ -11888,6 +11862,59 @@ intel_commit_primary_plane(struct drm_plane *plane,
>  	intel_plane->src_h = drm_rect_height(&state->orig_src);
>  	intel_plane->obj = obj;
>  
> +	if (intel_crtc->active) {
> +		/*
> +		 * FBC does not work on some platforms for rotated
> +		 * planes, so disable it when rotation is not 0 and
> +		 * update it when rotation is set back to 0.
> +		 *
> +		 * FIXME: This is redundant with the fbc update done in
> +		 * the primary plane enable function except that that
> +		 * one is done too late. We eventually need to unify
> +		 * this.
> +		 */
> +		if (intel_crtc->primary_enabled &&
> +		    INTEL_INFO(dev)->gen <= 4 && !IS_G4X(dev) &&
> +		    dev_priv->fbc.plane == intel_crtc->plane &&
> +		    intel_plane->rotation != BIT(DRM_ROTATE_0)) {
> +			intel_disable_fbc(dev);
> +		}
> +
> +		if (state->visible) {
> +			/* FIXME: kill this fastboot hack */
> +			intel_update_pipe_size(intel_crtc);
> +

Need to set primary_enabled=true here.

> +			dev_priv->display.update_primary_plane(crtc, plane->fb,
> +					crtc->x, crtc->y);

And you need to duplicate the BDW wait_for_vblank hack from
intel_enable_primary_hw_plane() here. But that wait should only be
done if the plane was previosuly disabled.

> +		} else {
> +			/*
> +			 * If clipping results in a non-visible primary plane,
> +			 * we'll disable the primary plane.  Note that this is
> +			 * a bit different than what happens if userspace
> +			 * explicitly disables the plane by passing fb=0
> +			 * because plane->fb still gets set and pinned.
> +			 */
> +			intel_disable_primary_hw_plane(plane, crtc);
> +		}
> +
> +		intel_frontbuffer_flip(dev, INTEL_FRONTBUFFER_PRIMARY(pipe));
> +
> +		mutex_lock(&dev->struct_mutex);
> +		intel_update_fbc(dev);
> +		mutex_unlock(&dev->struct_mutex);
> +	}
> +
> +	if (old_fb) {

Still could unify the old_fb!=fb checks with this one.

if (old_fb && old_fb != fb) {

> +		if (intel_crtc->active && old_fb != fb)
> +			intel_wait_for_vblank(dev, intel_crtc->pipe);
> +
> +		if (old_fb != fb) {
> +			mutex_lock(&dev->struct_mutex);
> +			intel_unpin_fb_obj(old_obj);
> +			mutex_unlock(&dev->struct_mutex);
> +		}
> +	}
> +
>  	return 0;
>  }
>  
> -- 
> 1.9.3
> 
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-- 
Ville Syrjälä
Intel OTC