linux-kernel - [PATCH v2 3/4] mtd: rawnand: Add support manufacturer specific suspend/resume operation

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Date:   Mon, 28 Oct 2019 17:55:26 +0800
From:   Mason Yang <masonccyang@...c.com.tw>
To:     miquel.raynal@...tlin.com, richard@....at, marek.vasut@...il.com,
        dwmw2@...radead.org, bbrezillon@...nel.org,
        computersforpeace@...il.com, vigneshr@...com
Cc:     juliensu@...c.com.tw, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org, masonccyang@...c.com.tw
Subject: [PATCH v2 3/4] mtd: rawnand: Add support manufacturer specific suspend/resume operation

Patch nand_suspend() & nand_resume() for manufacturer specific
suspend/resume operation.

Signed-off-by: Mason Yang <masonccyang@...c.com.tw>
---
 drivers/mtd/nand/raw/nand_base.c | 9 +++++++--
 include/linux/mtd/rawnand.h      | 2 ++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 5e318ff..2a9c5bb 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -4323,6 +4323,8 @@ static int nand_suspend(struct mtd_info *mtd)
 	struct nand_chip *chip = mtd_to_nand(mtd);
 
 	mutex_lock(&chip->lock);
+	if (chip->_suspend)
+		chip->_suspend(chip);
 	chip->suspended = 1;
 	mutex_unlock(&chip->lock);
 
@@ -4338,11 +4340,14 @@ 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 2430ecd..6b14041 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -1117,6 +1117,8 @@ 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