[RFC PATCH 3/5] common/board_f: Catch bloblist before starting resevatinos

[Devarsh Thakkar]

Start reservations needed for init sequence only after catching
bloblists from previous stage.

This is to avoid catching bloblists in the middle causing
gaps while u-boot is reserving.

Adjust the relocaddr as per video hand-off information
received from previous stage so that further reservations
start only after regions reserved for previous stages

Skip reservation for video memory if it was already
filled by a bloblist.

Signed-off-by: Devarsh Thakkar <devarsht at ti.com>
---
 common/board_f.c | 36 +++++++++++++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 3 deletions(-)

diff --git a/common/board_f.c b/common/board_f.c
index aef395b135..ef53aa9bee 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -403,7 +403,8 @@ __weak int arch_reserve_mmu(void)
 	return 0;
 }
 
-static int reserve_video(void)
+
+static int reserve_video_from_videoblob(void)
 {
 	if (IS_ENABLED(CONFIG_SPL_VIDEO_HANDOFF) && spl_phase() > PHASE_SPL) {
 		struct video_handoff *ho;
@@ -412,8 +413,36 @@ static int reserve_video(void)
 		if (!ho)
 			return log_msg_ret("blf", -ENOENT);
 		video_reserve_from_bloblist(ho);
-		gd->relocaddr = ho->fb;
-	} else if (CONFIG_IS_ENABLED(VIDEO)) {
+
+		/* Sanity check fb from blob is before current relocaddr */
+		if (likely(gd->relocaddr > (unsigned long) ho->fb)) {
+			gd->relocaddr = ho->fb;
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * Check if any bloblist received specifying reserved areas from previous stage and adjust
+ * gd->relocaddr accordingly, so that we start reserving after pre-reserved areas
+ * from previous stage.
+ *
+ * NOTE:
+ * IT is recommended that all bloblists from previous stage are reserved from ram_top
+ * as next stage will simply start reserving further regions after them.
+ */
+static int setup_relocaddr_from_bloblist(void)
+{
+	reserve_video_from_videoblob();
+
+	return 0;
+}
+
+
+static int reserve_video(void)
+{
+	if (CONFIG_IS_ENABLED(VIDEO)) {
 		ulong addr;
 		int ret;
 
@@ -925,6 +954,7 @@ static const init_fnc_t init_sequence_f[] = {
 	reserve_pram,
 #endif
 	reserve_round_4k,
+	setup_relocaddr_from_bloblist,
 	arch_reserve_mmu,
 	reserve_video,
 	reserve_trace,
-- 
2.34.1