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Subject[PATCH v4 1/2] mtd: rawnand: Add support for manufacturer specific suspend/resume operation
Date
Patch nand_suspend() & nand_resume() to let manufacturers overwrite
suspend/resume operations.

Signed-off-by: Mason Yang <masonccyang@mxic.com.tw>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
drivers/mtd/nand/raw/nand_base.c | 17 +++++++++++++----
include/linux/mtd/rawnand.h | 4 ++++
2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index f64e3b6..bde17a3 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -4321,16 +4321,22 @@ static int nand_block_markbad(struct mtd_info *mtd, loff_t ofs)
/**
* nand_suspend - [MTD Interface] Suspend the NAND flash
* @mtd: MTD device structure
+ *
+ * Returns 0 for success or negative error code otherwise.
*/
static int nand_suspend(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd_to_nand(mtd);
+ int ret = 0;

mutex_lock(&chip->lock);
- chip->suspended = 1;
+ if (chip->suspend)
+ ret = chip->suspend(chip);
+ if (!ret)
+ chip->suspended = 1;
mutex_unlock(&chip->lock);

- return 0;
+ return ret;
}

/**
@@ -4342,11 +4348,14 @@ static void nand_resume(struct mtd_info *mtd)
struct nand_chip *chip = mtd_to_nand(mtd);

mutex_lock(&chip->lock);
- if (chip->suspended)
+ if (chip->suspended) {
+ if (chip->resume)
+ chip->resume(chip);
chip->suspended = 0;
- else
+ } else {
pr_err("%s called for a chip which is not in suspended state\n",
__func__);
+ }
mutex_unlock(&chip->lock);
}

diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index 4ab9bcc..b3dccb9 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -1064,6 +1064,8 @@ struct nand_legacy {
* @lock: lock protecting the suspended field. Also used to
* serialize accesses to the NAND device.
* @suspended: set to 1 when the device is suspended, 0 when it's not.
+ * @suspend: [REPLACEABLE] specific NAND device suspend operation
+ * @resume: [REPLACEABLE] specific NAND device resume operation
* @bbt: [INTERN] bad block table pointer
* @bbt_td: [REPLACEABLE] bad block table descriptor for flash
* lookup.
@@ -1117,6 +1119,8 @@ struct nand_chip {

struct mutex lock;
unsigned int suspended : 1;
+ int (*suspend)(struct nand_chip *chip);
+ void (*resume)(struct nand_chip *chip);

uint8_t *oob_poi;
struct nand_controller *controller;
--
1.9.1
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