staging: vboxvideo: Add page-flip support (2408898e) · Commits · 戴 / test

Adds crtc page-flip support by passing the new requested framebuffer to vbox_crtc_do_set_base(). Note there is no attempt to support vblank interrupts, it's not not known how to do this in VBOX or if it is even possible. Since this page-flip implementation does not try to sync the page-flip to vertical blanking, tearing effects are possible. Signed-off-by:

Steve Longerbeam <steve_longerbeam@mentor.com> Signed-off-by:

Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vboxvideo/vbox_mode.c

+26 −0

Original line number	Diff line number	Diff line
		@@ -308,6 +308,31 @@ static int vbox_crtc_mode_set(struct drm_crtc *crtc,
		return ret;
		}

		static int vbox_crtc_page_flip(struct drm_crtc *crtc,
		struct drm_framebuffer *fb,
		struct drm_pending_vblank_event *event,
		uint32_t page_flip_flags,
		struct drm_modeset_acquire_ctx *ctx)
		{
		struct vbox_private *vbox = crtc->dev->dev_private;
		struct drm_device *drm = vbox->dev;
		unsigned long flags;
		int rc;

		rc = vbox_crtc_do_set_base(crtc, CRTC_FB(crtc), fb, 0, 0);
		if (rc)
		return rc;

		spin_lock_irqsave(&drm->event_lock, flags);

		if (event)
		drm_crtc_send_vblank_event(crtc, event);

		spin_unlock_irqrestore(&drm->event_lock, flags);

		return 0;
		}

		static void vbox_crtc_disable(struct drm_crtc *crtc)
		{
		}
		@@ -346,6 +371,7 @@ static const struct drm_crtc_funcs vbox_crtc_funcs = {
		.reset = vbox_crtc_reset,
		.set_config = drm_crtc_helper_set_config,
		/* .gamma_set = vbox_crtc_gamma_set, */
		.page_flip = vbox_crtc_page_flip,
		.destroy = vbox_crtc_destroy,
		};

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