| Message ID | 1490228282-10805-2-git-send-email-yamada.masahiro@socionext.com |
|---|---|
| State | New |
| Headers | show |
| Series | None | expand |
On Thu, 23 Mar 2017 09:17:37 +0900 Masahiro Yamada <yamada.masahiro@socionext.com> wrote: > 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. I would expect the ->ecc_xxx_ds information to be taken into account when nand-ecc-strength and nand-ecc-maximize are missing (see my reply to patch 26). > > Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> > Acked-by: Rob Herring <robh@kernel.org> > --- > > Changes in v2: > - Add available values in the binding document > > Documentation/devicetree/bindings/mtd/denali-nand.txt | 6 ++++++ > drivers/mtd/nand/denali.c | 18 ++++++++++++++++-- > drivers/mtd/nand/denali_pci.c | 1 + > 3 files changed, 23 insertions(+), 2 deletions(-) > > diff --git a/Documentation/devicetree/bindings/mtd/denali-nand.txt b/Documentation/devicetree/bindings/mtd/denali-nand.txt > index 25313c7..647618e 100644 > --- a/Documentation/devicetree/bindings/mtd/denali-nand.txt > +++ b/Documentation/devicetree/bindings/mtd/denali-nand.txt > @@ -11,6 +11,12 @@ Optional properties: > - nand-ecc-step-size: must be 512 or 1024. If not specified, default to: > 512 for "altr,socfpga-denali-nand" > see nand.txt for details. > + - nand-ecc-strength: see nand.txt for details. Available values are: > + 8, 15 for "altr,socfpga-denali-nand" > + - 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 96074b8..70e9f06 100644 > --- a/drivers/mtd/nand/denali.c > +++ b/drivers/mtd/nand/denali.c > @@ -1627,9 +1627,23 @@ int denali_init(struct denali_nand_info *denali) > goto failed_req_irq; > } > > - ret = denali_set_max_ecc_strength(denali); > - if (ret) > + if (!chip->ecc.strength && !(chip->ecc.options & NAND_ECC_MAXIMIZE)) { > + dev_info(denali->dev, > + "No ECC strength strategy is specified. Maximizing ECC strength\n"); > + chip->ecc.options |= NAND_ECC_MAXIMIZE; > + } > + > + if (chip->ecc.options & NAND_ECC_MAXIMIZE) { > + ret = denali_set_max_ecc_strength(denali); > + if (ret) > + goto failed_req_irq; > + } else if (!(denali->ecc_strength_avail & BIT(chip->ecc.strength))) { > + dev_err(denali->dev, > + "Specified ECC strength (%d) is not supported for this controller.\n", > + chip->ecc.strength); > + ret = -EINVAL; > goto failed_req_irq; > + } > > chip->ecc.bytes = denali_calc_ecc_bytes(chip->ecc.size, > chip->ecc.strength); > diff --git a/drivers/mtd/nand/denali_pci.c b/drivers/mtd/nand/denali_pci.c > index a1ee9f8..a39682a5 100644 > --- a/drivers/mtd/nand/denali_pci.c > +++ b/drivers/mtd/nand/denali_pci.c > @@ -87,6 +87,7 @@ static int denali_pci_probe(struct pci_dev *dev, const struct pci_device_id *id) > > denali->ecc_strength_avail = BIT(15) | BIT(8); > denali->caps |= DENALI_CAP_ECC_SIZE_512; > + denali->nand.ecc.options |= NAND_ECC_MAXIMIZE; > > ret = denali_init(denali); > if (ret) ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/
diff --git a/Documentation/devicetree/bindings/mtd/denali-nand.txt b/Documentation/devicetree/bindings/mtd/denali-nand.txt index 25313c7..647618e 100644 --- a/Documentation/devicetree/bindings/mtd/denali-nand.txt +++ b/Documentation/devicetree/bindings/mtd/denali-nand.txt @@ -11,6 +11,12 @@ Optional properties: - nand-ecc-step-size: must be 512 or 1024. If not specified, default to: 512 for "altr,socfpga-denali-nand" see nand.txt for details. + - nand-ecc-strength: see nand.txt for details. Available values are: + 8, 15 for "altr,socfpga-denali-nand" + - 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 96074b8..70e9f06 100644 --- a/drivers/mtd/nand/denali.c +++ b/drivers/mtd/nand/denali.c @@ -1627,9 +1627,23 @@ int denali_init(struct denali_nand_info *denali) goto failed_req_irq; } - ret = denali_set_max_ecc_strength(denali); - if (ret) + if (!chip->ecc.strength && !(chip->ecc.options & NAND_ECC_MAXIMIZE)) { + dev_info(denali->dev, + "No ECC strength strategy is specified. Maximizing ECC strength\n"); + chip->ecc.options |= NAND_ECC_MAXIMIZE; + } + + if (chip->ecc.options & NAND_ECC_MAXIMIZE) { + ret = denali_set_max_ecc_strength(denali); + if (ret) + goto failed_req_irq; + } else if (!(denali->ecc_strength_avail & BIT(chip->ecc.strength))) { + dev_err(denali->dev, + "Specified ECC strength (%d) is not supported for this controller.\n", + chip->ecc.strength); + ret = -EINVAL; goto failed_req_irq; + } chip->ecc.bytes = denali_calc_ecc_bytes(chip->ecc.size, chip->ecc.strength); diff --git a/drivers/mtd/nand/denali_pci.c b/drivers/mtd/nand/denali_pci.c index a1ee9f8..a39682a5 100644 --- a/drivers/mtd/nand/denali_pci.c +++ b/drivers/mtd/nand/denali_pci.c @@ -87,6 +87,7 @@ static int denali_pci_probe(struct pci_dev *dev, const struct pci_device_id *id) denali->ecc_strength_avail = BIT(15) | BIT(8); denali->caps |= DENALI_CAP_ECC_SIZE_512; + denali->nand.ecc.options |= NAND_ECC_MAXIMIZE; ret = denali_init(denali); if (ret)