File 0002-HACK-drm-tilcdc-add-vsync-callback-for-use-in-omaplf.patch of Package kernel-adaptation-bbb-v3.14

From eaf6ac95a81612250d6bd5e2ed9da41e52aac444 Mon Sep 17 00:00:00 2001
From: Darren Etheridge <detheridge@ti.com>
Date: Fri, 11 Jul 2014 09:15:25 -0500
Subject: [PATCH 2/6] HACK: drm/tilcdc: add vsync callback for use in omaplfb
 for gpu

Add a vsync callback registration API that is identical to what was done
for da8xx-fb.c.

Need to find if there is a better way using the DRM infrastructure from
kernel space.  Either that or change the userspace window manager stuff in
the gpu libraries to make use of the DRM provided syncronization
mechanisms.

Signed-off-by: Darren Etheridge <detheridge@ti.com>
---
 drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 34 ++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/tilcdc/tilcdc_drv.h  |  5 +++++
 2 files changed, 39 insertions(+)

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index 4b6b139..bf94a0f 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -37,6 +37,10 @@ struct tilcdc_crtc {
 	/* for deferred fb unref's: */
 	struct drm_flip_work unref_work;
 };
+
+static vsync_callback_t vsync_cb_handler;
+static void *vsync_cb_arg;
+
 #define to_tilcdc_crtc(x) container_of(x, struct tilcdc_crtc, base)
 
 static void unref_worker(struct drm_flip_work *work, void *val)
@@ -576,6 +580,32 @@ out:
 	pm_runtime_put_sync(dev->dev);
 }
 
+int register_vsync_cb(vsync_callback_t handler, void *arg, int idx)
+{
+	if ((vsync_cb_handler == NULL) && (vsync_cb_arg == NULL)) {
+		vsync_cb_arg = arg;
+		vsync_cb_handler = handler;
+	} else {
+		return -EEXIST;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(register_vsync_cb);
+
+int unregister_vsync_cb(vsync_callback_t handler, void *arg, int idx)
+{
+	if ((vsync_cb_handler == handler) && (vsync_cb_arg == arg)) {
+		vsync_cb_handler = NULL;
+		vsync_cb_arg = NULL;
+	} else {
+		return -ENXIO;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(unregister_vsync_cb);
+
 irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
 {
 	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
@@ -610,6 +640,10 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
 		tilcdc_crtc->event = NULL;
 		if (event)
 			drm_send_vblank_event(dev, 0, event);
+
+		if (vsync_cb_handler)
+			vsync_cb_handler(vsync_cb_arg);
+
 		spin_unlock_irqrestore(&dev->event_lock, flags);
 
 		if (dirty && !tilcdc_crtc->dirty)
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.h b/drivers/gpu/drm/tilcdc/tilcdc_drv.h
index 0938036..05269be 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.h
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.h
@@ -170,4 +170,9 @@ void tilcdc_crtc_set_panel_info(struct drm_crtc *crtc,
 int tilcdc_crtc_mode_valid(struct drm_crtc *crtc, struct drm_display_mode *mode);
 int tilcdc_crtc_max_width(struct drm_crtc *crtc);
 
+/* used by SGX OMAPLFB drvier */
+typedef void (*vsync_callback_t)(void *arg);
+int register_vsync_cb(vsync_callback_t handler, void *arg, int idx);
+int unregister_vsync_cb(vsync_callback_t handler, void *arg, int idx);
+
 #endif /* __TILCDC_DRV_H__ */
-- 
1.9.1