[U-Boot] [PATCH v4] misc: fs_loader: Add support for initializing block device

[tien.fong.chee at intel.com]

From: Tien Fong Chee <tien.fong.chee at intel.com>

Firmware loader would encounter problem if the block device is accessed
before initializing it. This patch would adding the support of probing
block device and initializing block before the block device is accessed by
firmware loader.

Signed-off-by: Tien Fong Chee <tien.fong.chee at intel.com>

---

changes in v4
- Removed header mmc.h
- Dropped extra blank line

changes in v3:
- Initializing block device through probing the blk device

changes in v2:
- Initializing MMC through probing the blk device
---
 drivers/misc/fs_loader.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/misc/fs_loader.c b/drivers/misc/fs_loader.c
index 57a14a3..a2e3763 100644
--- a/drivers/misc/fs_loader.c
+++ b/drivers/misc/fs_loader.c
@@ -252,6 +252,29 @@ static int fs_loader_ofdata_to_platdata(struct udevice *dev)
 
 static int fs_loader_probe(struct udevice *dev)
 {
+#if CONFIG_IS_ENABLED(DM) && CONFIG_IS_ENABLED(BLK)
+	int ret;
+	struct device_platdata *plat = dev->platdata;
+
+	if (plat->phandlepart.phandle) {
+		ofnode node = ofnode_get_by_phandle(plat->phandlepart.phandle);
+		struct udevice *parent_dev = NULL;
+
+		ret = device_get_global_by_ofnode(node, &parent_dev);
+		if (!ret) {
+			struct udevice *dev;
+
+			ret = blk_get_from_parent(parent_dev, &dev);
+			if (ret) {
+				debug("fs_loader: No block device: %d\n",
+					ret);
+
+				return ret;
+			}
+		}
+	}
+#endif
+
 	return 0;
 };
 
-- 
2.2.0