dm: video: Add damage tracking API
We are going to introduce image damage tracking to fasten up screen
refresh on large displays. This patch adds damage tracking for up to
one rectangle of the screen which is typically enough to hold blt or
text print updates. Callers into this API and a reduced dcache flush
code path will follow in later patches.
Signed-off-by: Alexander Graf <agraf@csgraf.de>
Reported-by: Da Xue <da@libre.computer>
[Alper: Use xstart/yend, document new fields, return void from
video_damage(), declare priv, drop headers, use IS_ENABLED()]
Co-developed-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
Link: https://lore.kernel.org/u-boot/20230821135111.3558478-5-alpernebiyasak@gmail.com/
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/video-uclass.c b/drivers/video/video-uclass.c
index c684c99..8e2edd7 100644
--- a/drivers/video/video-uclass.c
+++ b/drivers/video/video-uclass.c
@@ -369,6 +369,34 @@
priv->colour_bg = video_index_to_colour(priv, back);
}
+/* Notify about changes in the frame buffer */
+#ifdef CONFIG_VIDEO_DAMAGE
+void video_damage(struct udevice *vid, int x, int y, int width, int height)
+{
+ struct video_priv *priv = dev_get_uclass_priv(vid);
+ int xend = x + width;
+ int yend = y + height;
+
+ if (x > priv->xsize)
+ return;
+
+ if (y > priv->ysize)
+ return;
+
+ if (xend > priv->xsize)
+ xend = priv->xsize;
+
+ if (yend > priv->ysize)
+ yend = priv->ysize;
+
+ /* Span a rectangle across all old and new damage */
+ priv->damage.xstart = min(x, priv->damage.xstart);
+ priv->damage.ystart = min(y, priv->damage.ystart);
+ priv->damage.xend = max(xend, priv->damage.xend);
+ priv->damage.yend = max(yend, priv->damage.yend);
+}
+#endif
+
/* Flush video activity to the caches */
int video_sync(struct udevice *vid, bool force)
{
@@ -402,6 +430,13 @@
#endif
priv->last_sync = get_timer(0);
+ if (IS_ENABLED(CONFIG_VIDEO_DAMAGE)) {
+ priv->damage.xstart = priv->xsize;
+ priv->damage.ystart = priv->ysize;
+ priv->damage.xend = 0;
+ priv->damage.yend = 0;
+ }
+
return 0;
}