[PATCH] nand_base: fix for ONFI chips that do not support GET/SET FEATURES

[David Mosberger-Tang]

I not seen any ACK that this patch has been queued for merging, so I'm
re-sending.  Please let me know what you intend to do with it.

Thanks,

  --david
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mtd: nand_base: Only use GET/SET FEATURES command on chips that support them.

Spansion's S34MLx chips support ONFI but not the GET/SET FEATURES calls.

Signed-off-by: David Mosberger <dmosberger at gmail.com>

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index dfcd0a5..13bdb96 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2720,7 +2720,9 @@ static int nand_onfi_set_features(struct mtd_info *mtd, struct nand_chip *chip,
 {
 	int status;
 
-	if (!chip->onfi_version)
+	if (!chip->onfi_version ||
+	    !(le16_to_cpu(chip->onfi_params.opt_cmd)
+	      & ONFI_OPT_CMD_SET_GET_FEATURES))
 		return -EINVAL;
 
 	chip->cmdfunc(mtd, NAND_CMD_SET_FEATURES, addr, -1);
@@ -2741,7 +2743,9 @@ static int nand_onfi_set_features(struct mtd_info *mtd, struct nand_chip *chip,
 static int nand_onfi_get_features(struct mtd_info *mtd, struct nand_chip *chip,
 			int addr, uint8_t *subfeature_param)
 {
-	if (!chip->onfi_version)
+	if (!chip->onfi_version ||
+	    !(le16_to_cpu(chip->onfi_params.opt_cmd)
+	      & ONFI_OPT_CMD_SET_GET_FEATURES))
 		return -EINVAL;
 
 	/* clear the sub feature parameters */
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index ab63634..9b98af8 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -217,6 +217,9 @@ struct nand_chip;
 /* ONFI subfeature parameters length */
 #define ONFI_SUBFEATURE_PARAM_LEN	4
 
+/* ONFI optional commands SET/GET FEATURES supported? */
+#define ONFI_OPT_CMD_SET_GET_FEATURES	(1 << 2)
+
 struct nand_onfi_params {
 	/* rev info and features block */
 	/* 'O' 'N' 'F' 'I'  */