From 8c0b5d268d36b0d152bad343503e74056617ab43 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Thu, 2 Jul 2020 21:12:23 -0600
Subject: [PATCH] video: Add helpers for vidconsole for the copy framebuffer

Add a convenience function to call video_sync_copy() for a vidconsole.
Also add a memmove() helper, which does the memmove() as well as the sync.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Anatolij Gustschin <agust@denx.de>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
---
 drivers/video/vidconsole-uclass.c | 16 ++++++++++
 include/video_console.h           | 49 +++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+)

diff --git a/drivers/video/vidconsole-uclass.c b/drivers/video/vidconsole-uclass.c
index 841cfdaf93..3a07f36ce2 100644
--- a/drivers/video/vidconsole-uclass.c
+++ b/drivers/video/vidconsole-uclass.c
@@ -629,6 +629,22 @@ UCLASS_DRIVER(vidconsole) = {
 	.per_device_auto_alloc_size	= sizeof(struct vidconsole_priv),
 };
 
+#ifdef CONFIG_VIDEO_COPY
+int vidconsole_sync_copy(struct udevice *dev, void *from, void *to)
+{
+	struct udevice *vid = dev_get_parent(dev);
+
+	return video_sync_copy(vid, from, to);
+}
+
+int vidconsole_memmove(struct udevice *dev, void *dst, const void *src,
+		       int size)
+{
+	memmove(dst, src, size);
+	return vidconsole_sync_copy(dev, dst, dst + size);
+}
+#endif
+
 #if CONFIG_IS_ENABLED(CMD_VIDCONSOLE)
 void vidconsole_position_cursor(struct udevice *dev, unsigned col, unsigned row)
 {
diff --git a/include/video_console.h b/include/video_console.h
index d3bc063165..06b798ef10 100644
--- a/include/video_console.h
+++ b/include/video_console.h
@@ -256,4 +256,53 @@ void vidconsole_position_cursor(struct udevice *dev, unsigned col,
  */
 u32 vid_console_color(struct video_priv *priv, unsigned int idx);
 
+#ifdef CONFIG_VIDEO_COPY
+/**
+ * vidconsole_sync_copy() - Sync back to the copy framebuffer
+ *
+ * This ensures that the copy framebuffer has the same data as the framebuffer
+ * for a particular region. It should be called after the framebuffer is updated
+ *
+ * @from and @to can be in either order. The region between them is synced.
+ *
+ * @dev: Vidconsole device being updated
+ * @from: Start/end address within the framebuffer (->fb)
+ * @to: Other address within the frame buffer
+ * @return 0 if OK, -EFAULT if the start address is before the start of the
+ *	frame buffer start
+ */
+int vidconsole_sync_copy(struct udevice *dev, void *from, void *to);
+
+/**
+ * vidconsole_memmove() - Perform a memmove() within the frame buffer
+ *
+ * This handles a memmove(), e.g. for scrolling. It also updates the copy
+ * framebuffer.
+ *
+ * @dev: Vidconsole device being updated
+ * @dst: Destination address within the framebuffer (->fb)
+ * @src: Source address within the framebuffer (->fb)
+ * @size: Number of bytes to transfer
+ * @return 0 if OK, -EFAULT if the start address is before the start of the
+ *	frame buffer start
+ */
+int vidconsole_memmove(struct udevice *dev, void *dst, const void *src,
+		       int size);
+#else
+static inline int vidconsole_sync_copy(struct udevice *dev, void *from,
+				       void *to)
+{
+	return 0;
+}
+
+static inline int vidconsole_memmove(struct udevice *dev, void *dst,
+				     const void *src, int size)
+{
+	memmove(dst, src, size);
+
+	return 0;
+}
+
+#endif
+
 #endif