Re: [PATCH 04/12] mtd: nand: atmel: set ECC algorithm explicitly

Boris Brezillon
2016-04-16T07:41:04Z

On Fri, 15 Apr 2016 21:54:04 +0200
Rafał Miłecki <zajec5@gmail.com> wrote:

> Set it to value obtained from platform data with fallback to Hamming.
> This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
> enum nand_ecc_algo).
>
> Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
> ---
> drivers/mtd/nand/atmel_nand.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index eec8ca7..6aa82e4 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -1212,6 +1212,7 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
> dev_warn(host->dev,
> "Can't get I/O resource regs for PMECC controller, rolling back on software ECC\n");
> nand_chip->ecc.mode = NAND_ECC_SOFT;
> + nand_chip->ecc.algo = NAND_ECC_HAMMING;
> return 0;
> }
>
> @@ -1295,6 +1296,7 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
> /* page size not handled by HW ECC */
> /* switching back to soft ECC */
> nand_chip->ecc.mode = NAND_ECC_SOFT;
> + nand_chip->ecc.algo = NAND_ECC_HAMMING;
> return 0;
> }
>
> @@ -1613,6 +1615,7 @@ static int atmel_of_init_port(struct atmel_nand_host *host,
> * even if the nand-ecc-mode property is not defined.
> */
> host->nand_chip.ecc.mode = NAND_ECC_SOFT;
> + host->nand_chip.ecc.algo = NAND_ECC_HAMMING;
>
> return 0;
> }
> @@ -1629,6 +1632,7 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
> dev_err(host->dev,
> "Can't get I/O resource regs, use software ECC\n");
> nand_chip->ecc.mode = NAND_ECC_SOFT;
> + nand_chip->ecc.algo = NAND_ECC_HAMMING;
> return 0;
> }
>
> @@ -1661,6 +1665,7 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
> /* page size not handled by HW ECC */
> /* switching back to soft ECC */
> nand_chip->ecc.mode = NAND_ECC_SOFT;
> + nand_chip->ecc.algo = NAND_ECC_HAMMING;
> return 0;
> }
>
> @@ -2159,6 +2164,7 @@ static int atmel_nand_probe(struct platform_device *pdev)
> memcpy(&host->board, dev_get_platdata(&pdev->dev),
> sizeof(struct atmel_nand_data));
> nand_chip->ecc.mode = host->board.ecc_mode;
> + nand_chip->ecc.algo = host->board.ecc_algo;

If you follow my suggestion on patch 3, it should be:

if (host->board.ecc_mode == NAND_ECC_SOFT)
nand_chip->ecc.algo = NAND_ECC_HAMMING;

This way we avoid any dependency between the avr32 and nand tree.

>
> /* 16-bit bus width */
> if (host->board.bus_width_16)

--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering