Historically, this driver tried to choose as big ECC strength as
possible, but it would be reasonable to allow DT to set a particular
ECC strength with "nand-ecc-strength" property.
Going forward, DT platforms should specify "nand-ecc-strength" or
"nand-ecc-maximize" to show the ECC strength strategy explicitly.
If nothing is specified in DT, "nand-ecc-maximize" is implied since
this was the original behavior. It applies to PCI platforms too.
Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
---
.../devicetree/bindings/mtd/denali-nand.txt | 5 ++++
drivers/mtd/nand/denali.c | 27 +++++++++++++++++++++-
drivers/mtd/nand/denali_pci.c | 2 ++
3 files changed, 33 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/mtd/denali-nand.txt b/Documentation/devicetree/bindings/mtd/denali-nand.txt
index e9d5818..51fe195 100644
--- a/Documentation/devicetree/bindings/mtd/denali-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/denali-nand.txt
@@ -9,6 +9,11 @@ Required properties:
Optional properties:
- nand-ecc-step-size: must be 512 or 1024. If not specified, default to 512.
see nand.txt for details.
+ - nand-ecc-strength: see nand.txt for details
+ - nand-ecc-maximize: see nand.txt for details
+
+Note:
+Either nand-ecc-strength or nand-ecc-maximize should be specified.
The device tree may optionally contain sub-nodes describing partitions of the
address space. See partition.txt for more detail.
diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index 54c9e0c..df174ca 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -1393,6 +1393,21 @@ static int denali_set_max_ecc_strength(struct denali_nand_info *denali)
return -EINVAL;
}
+static int denali_check_ecc_strength(struct denali_nand_info *denali)
+{
+ const int *ecc_strength = denali->ecc_strength_avail;
+
+ for (; *ecc_strength; ecc_strength++) {
+ if (*ecc_strength == denali->nand.ecc.strength)
+ return 0;
+ }
+
+ dev_err(denali->dev,
+ "Specified ECC strength is not supported for this controller.\n");
+
+ return -EINVAL;
+}
+
static int denali_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
@@ -1628,7 +1643,17 @@ int denali_init(struct denali_nand_info *denali)
if (!denali->ecc_strength_avail)
denali->ecc_strength_avail = denali_default_ecc_strength;
- ret = denali_set_max_ecc_strength(denali);
+ if (!chip->ecc.strength && !(chip->ecc.options & NAND_ECC_MAXIMIZE)) {
+ dev_info(denali->dev,
+ "No ECC strength is specified. Trying max ECC strength strategy\n");
+ chip->ecc.options |= NAND_ECC_MAXIMIZE;
+ }
+
+ if (chip->ecc.options & NAND_ECC_MAXIMIZE)
+ ret = denali_set_max_ecc_strength(denali);
+ else
+ ret = denali_check_ecc_strength(denali);
+
if (ret)
goto failed_req_irq;
diff --git a/drivers/mtd/nand/denali_pci.c b/drivers/mtd/nand/denali_pci.c
index ac84323..0064f3e 100644
--- a/drivers/mtd/nand/denali_pci.c
+++ b/drivers/mtd/nand/denali_pci.c
@@ -85,6 +85,8 @@ static int denali_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
goto failed_remap_reg;
}
+ denali->nand.ecc.options |= NAND_ECC_MAXIMIZE;
+
ret = denali_init(denali);
if (ret)
goto failed_remap_mem;
--
2.7.4
--
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