gigadevice raise error only 8 error status, and not disable ecc.

Change-Id: I89b77564c96ec08657980f060edc90c16dba3d20
Signed-off-by: Chong Qiao <qiaochong@loongson.cn>

include/linux/mtd/spinand.h

@@ -81,6 +81,7 @@ struct spinand_info {
 	struct spi_device *spi;
 	void *priv;
 	int gd_ctype;
+	int writesize;
 };
 
 struct nand_state {

sys/dev/nand/spinand_lld.c

@@ -418,7 +418,7 @@ static int spinand_read_page(struct spinand_info *info, int page_id,
 		u16 offset, u16 len, u8 *rbuf)
 {
 	int ret;
-	u8 status = 0;
+	u8 status = 0, eccerror = 0;
 
 #ifdef NOUSED_MTD_SPINAND_ONDIEECC
 	if (enable_read_hw_ecc) {
@@ -440,12 +440,11 @@ static int spinand_read_page(struct spinand_info *info, int page_id,
 		}
 
 		if ((status & STATUS_OIP_MASK) == STATUS_READY) {
-			if ((status & STATUS_ECC_MASK) == STATUS_ECC_ERROR) {
+			if ((info->gd_ctype &&  (status & 0x70) == 0x70) ||
+			    (!info->gd_ctype && (status & 0xc0) == 0x80)) {
 			dev_err(&info->spi->dev, "ecc error, page=%d\n",
 				page_id);
-				ret = spinand_disable_ecc(info->spi);
-				memset(rbuf,0,len);
-				return 0;
+			eccerror = 1;
 		}
 			break;
 		}
@@ -461,6 +460,9 @@ static int spinand_read_page(struct spinand_info *info, int page_id,
 		enable_read_hw_ecc = 0;
 	}
 #endif
+	if (eccerror && offset <= info->writesize && offset + len > info->writesize) {
+		rbuf[info->writesize - offset] = 0;
+	}
 	return 0;
 }
 
@@ -924,6 +926,7 @@ int spinand_probe(struct spi_device *spi_nand)
 	ret = nand_scan_ident(mtd, 1);
 	if (ret)
 		return -ENOMEM;
+	info->writesize = mtd->writesize;
 
 	if(info->gd_ctype == 1) {
 		spinand_driver_strength(info->spi);