mtd: nand: Wait for PAGEPROG to finish in drivers setting NAND_ECC_CUSTOM_PAGE_ACCESS

Drivers setting NAND_ECC_CUSTOM_PAGE_ACCESS are supposed to handle the
full read/write page sequence, and waiting for a page to actually be
programmed is part of this write-page sequence.
This is also what is done in ->write_oob_xxx() hooks, so let's do that in
->write_page_xxx() as well to make it consistent.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
[Linux commit: 41145649f4acb30249b636b945053db50c9331c5]
[masahiro:
 There is no driver setting NAND_ECC_CUSTOM_PAGE_ACCESS in U-Boot.
 No driver is affected by this change.]
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

drivers/mtd/nand/nand_base.c

@@ -2439,12 +2439,13 @@ static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
 	if (status < 0)
 		return status;
 
-	if (nand_standard_page_accessors(&chip->ecc))
+	if (nand_standard_page_accessors(&chip->ecc)) {
 		chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
-	status = chip->waitfunc(mtd, chip);
 
-	if (status & NAND_STATUS_FAIL)
-		return -EIO;
+		status = chip->waitfunc(mtd, chip);
+		if (status & NAND_STATUS_FAIL)
+			return -EIO;
+	}
 
 	return 0;
 }