[PATCH v5 5/8] video: Skip framebuffer reservation if already reserved

[Devarsh Thakkar]

Skip framebufer reservation if it was already reserved from previous
stage and whose information was passed using a bloblist.

Return error in case framebuffer information received from bloblist is
invalid i.e NULL or empty.

While at it, improve the debug message to make it more clear that
address in discussion is of framebuffer and not bloblist and also match
it with printing scheme followed in video_reserve function.

Signed-off-by: Devarsh Thakkar <devarsht at ti.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
---
V2:
- Add debug prints
- Fix commenting style
V3:
- Fix commenting style
V4:
- Remove extra checks on gd for video data in video_reserve
- Add check and return error if video handoff provided info is invalid
- Improve debug message
- Remove Reviewed-by due to additional changes per review comments
V5:
 - Use PHASE_BOARD_F to check code running in U-boot proper context
 - Add Reviewed-By
---
 common/board_f.c             |  8 ++++++--
 drivers/video/video-uclass.c | 10 ++++++++--
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/common/board_f.c b/common/board_f.c
index acf802c9cb..442b8349d0 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -407,11 +407,15 @@ static int reserve_video_from_videoblob(void)
 {
 	if (IS_ENABLED(CONFIG_SPL_VIDEO_HANDOFF) && spl_phase() > PHASE_SPL) {
 		struct video_handoff *ho;
+		int ret = 0;
 
 		ho = bloblist_find(BLOBLISTT_U_BOOT_VIDEO, sizeof(*ho));
 		if (!ho)
-			return log_msg_ret("blf", -ENOENT);
-		video_reserve_from_bloblist(ho);
+			return log_msg_ret("Missing video bloblist", -ENOENT);
+
+		ret = video_reserve_from_bloblist(ho);
+		if (ret)
+			return log_msg_ret("Invalid Video handoff info", ret);
 
 		/* Sanity check fb from blob is before current relocaddr */
 		if (likely(gd->relocaddr > (unsigned long)ho->fb))
diff --git a/drivers/video/video-uclass.c b/drivers/video/video-uclass.c
index f743ed74c8..d620a29c25 100644
--- a/drivers/video/video-uclass.c
+++ b/drivers/video/video-uclass.c
@@ -123,6 +123,9 @@ int video_reserve(ulong *addrp)
 	struct udevice *dev;
 	ulong size;
 
+	if (IS_ENABLED(CONFIG_SPL_VIDEO_HANDOFF) && spl_phase() == PHASE_BOARD_F)
+		return 0;
+
 	gd->video_top = *addrp;
 	for (uclass_find_first_device(UCLASS_VIDEO, &dev);
 	     dev;
@@ -208,11 +211,14 @@ int video_fill_part(struct udevice *dev, int xstart, int ystart, int xend,
 
 int video_reserve_from_bloblist(struct video_handoff *ho)
 {
+	if (!ho->fb || ho->size == 0)
+		return -ENOENT;
+
 	gd->video_bottom = ho->fb;
 	gd->fb_base = ho->fb;
 	gd->video_top = ho->fb + ho->size;
-	debug("Reserving %luk for video using blob at: %08x\n",
-	      ((unsigned long)ho->size) >> 10, (u32)ho->fb);
+	debug("%s: Reserving %lx bytes at %08x as per bloblist received\n",
+	      __func__, (unsigned long)ho->size, (u32)ho->fb);
 
 	return 0;
 }
-- 
2.34.1