[PATCH v4 15/15] mtd: rawnand: provide only single helper function for ECC conf

Abhishek Sahu
2018-06-20T08:58:11Z

Function nand_ecc_choose_conf() will be help for all the cases, so
other helper functions can be made static.

nand_check_ecc_caps(): Invoke nand_ecc_choose_conf() with
both chip->ecc.size and chip->ecc.strength
value set.

nand_maximize_ecc(): Invoke nand_ecc_choose_conf() with
NAND_ECC_MAXIMIZE flag.

nand_match_ecc_req(): Invoke nand_ecc_choose_conf() with either
chip->ecc.size or chip->ecc.strength value
set and without NAND_ECC_MAXIMIZE flag.

CC: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
---
Changes from v3:

NEW PATCH

drivers/mtd/nand/raw/nand_base.c | 39 +++++++++++++++------------------------
include/linux/mtd/rawnand.h | 9 ---------
2 files changed, 15 insertions(+), 33 deletions(-)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index c64e3fc..f620236 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -6077,24 +6077,17 @@ static int nand_set_ecc_soft_ops(struct mtd_info *mtd)
* by the controller and the calculated ECC bytes fit within the chip's OOB.
* On success, the calculated ECC bytes is set.
*/
-int nand_check_ecc_caps(struct nand_chip *chip,
- const struct nand_ecc_caps *caps, int oobavail)
+static int
+nand_check_ecc_caps(struct nand_chip *chip,
+ const struct nand_ecc_caps *caps, int oobavail)
{
struct mtd_info *mtd = nand_to_mtd(chip);
const struct nand_ecc_step_info *stepinfo;
int preset_step = chip->ecc.size;
int preset_strength = chip->ecc.strength;
- int nsteps, ecc_bytes;
+ int ecc_bytes, nsteps = mtd->writesize / preset_step;
int i, j;

- if (WARN_ON(oobavail < 0))
- return -EINVAL;
-
- if (!preset_step || !preset_strength)
- return -ENODATA;
-
- nsteps = mtd->writesize / preset_step;
-
for (i = 0; i < caps->nstepinfos; i++) {
stepinfo = &caps->stepinfos[i];

@@ -6127,7 +6120,6 @@ int nand_check_ecc_caps(struct nand_chip *chip,

return -ENOTSUPP;
}
-EXPORT_SYMBOL_GPL(nand_check_ecc_caps);

/**
* nand_match_ecc_req - meet the chip's requirement with least ECC bytes
@@ -6139,8 +6131,9 @@ int nand_check_ecc_caps(struct nand_chip *chip,
* number of ECC bytes (i.e. with the largest number of OOB-free bytes).
* On success, the chosen ECC settings are set.
*/
-int nand_match_ecc_req(struct nand_chip *chip,
- const struct nand_ecc_caps *caps, int oobavail)
+static int
+nand_match_ecc_req(struct nand_chip *chip,
+ const struct nand_ecc_caps *caps, int oobavail)
{
struct mtd_info *mtd = nand_to_mtd(chip);
const struct nand_ecc_step_info *stepinfo;
@@ -6151,9 +6144,6 @@ int nand_match_ecc_req(struct nand_chip *chip,
int best_ecc_bytes_total = INT_MAX;
int i, j;

- if (WARN_ON(oobavail < 0))
- return -EINVAL;
-
/* No information provided by the NAND chip */
if (!req_step || !req_strength)
return -ENOTSUPP;
@@ -6212,7 +6202,6 @@ int nand_match_ecc_req(struct nand_chip *chip,

return 0;
}
-EXPORT_SYMBOL_GPL(nand_match_ecc_req);

/**
* nand_maximize_ecc - choose the max ECC strength available
@@ -6223,8 +6212,9 @@ int nand_match_ecc_req(struct nand_chip *chip,
* Choose the max ECC strength that is supported on the controller, and can fit
* within the chip's OOB. On success, the chosen ECC settings are set.
*/
-int nand_maximize_ecc(struct nand_chip *chip,
- const struct nand_ecc_caps *caps, int oobavail)
+static int
+nand_maximize_ecc(struct nand_chip *chip,
+ const struct nand_ecc_caps *caps, int oobavail)
{
struct mtd_info *mtd = nand_to_mtd(chip);
const struct nand_ecc_step_info *stepinfo;
@@ -6234,9 +6224,6 @@ int nand_maximize_ecc(struct nand_chip *chip,
int best_strength, best_ecc_bytes;
int i, j;

- if (WARN_ON(oobavail < 0))
- return -EINVAL;
-
for (i = 0; i < caps->nstepinfos; i++) {
stepinfo = &caps->stepinfos[i];
step_size = stepinfo->stepsize;
@@ -6285,7 +6272,6 @@ int nand_maximize_ecc(struct nand_chip *chip,

return 0;
}
-EXPORT_SYMBOL_GPL(nand_maximize_ecc);

/**
* nand_ecc_choose_conf - Set the ECC strength and ECC step size
@@ -6307,6 +6293,11 @@ int nand_maximize_ecc(struct nand_chip *chip,
int nand_ecc_choose_conf(struct nand_chip *chip,
const struct nand_ecc_caps *caps, int oobavail)
{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+
+ if (WARN_ON(oobavail < 0 || oobavail > mtd->oobsize))
+ return -EINVAL;
+
if (chip->ecc.size && chip->ecc.strength)
return nand_check_ecc_caps(chip, caps, oobavail);

diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index 03a0061..0945868 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -1641,15 +1641,6 @@ int nand_check_erased_ecc_chunk(void *data, int datalen,
void *extraoob, int extraooblen,
int threshold);

-int nand_check_ecc_caps(struct nand_chip *chip,
- const struct nand_ecc_caps *caps, int oobavail);
-
-int nand_match_ecc_req(struct nand_chip *chip,
- const struct nand_ecc_caps *caps, int oobavail);
-
-int nand_maximize_ecc(struct nand_chip *chip,
- const struct nand_ecc_caps *caps, int oobavail);
-
int nand_ecc_choose_conf(struct nand_chip *chip,
const struct nand_ecc_caps *caps, int oobavail);