diff options
Diffstat (limited to 'target/linux/mvebu/patches-3.10/0154-mtd-nand-pxa3xx-make-ECC-configuration-checks-more-e.patch')
| -rw-r--r-- | target/linux/mvebu/patches-3.10/0154-mtd-nand-pxa3xx-make-ECC-configuration-checks-more-e.patch | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/target/linux/mvebu/patches-3.10/0154-mtd-nand-pxa3xx-make-ECC-configuration-checks-more-e.patch b/target/linux/mvebu/patches-3.10/0154-mtd-nand-pxa3xx-make-ECC-configuration-checks-more-e.patch new file mode 100644 index 0000000..8d9d21a --- /dev/null +++ b/target/linux/mvebu/patches-3.10/0154-mtd-nand-pxa3xx-make-ECC-configuration-checks-more-e.patch @@ -0,0 +1,67 @@ +From c312e183e96bed3b727888673d4b6b54b8e6283e Mon Sep 17 00:00:00 2001 +From: Brian Norris <computersforpeace@gmail.com> +Date: Thu, 14 Nov 2013 14:41:32 -0800 +Subject: [PATCH 154/203] mtd: nand: pxa3xx: make ECC configuration checks more + explicit + +The Armada BCH configuration in this driver uses one of the two +following ECC schemes: + + 16-bit correction per 2048 bytes + 16-bit correction per 1024 bytes + +These are sufficient for mapping to the 4-bit per 512-bytes and 8-bit +per 512-bytes (respectively) minimum correctability requirements of many +common NAND. + +The current code only checks for the required strength (4-bit or 8-bit) +without checking the ECC step size that is associated with that strength +(and simply assumes it is 512). While that is often a safe assumption to +make, let's make it explicit, since we have that information. + +Signed-off-by: Brian Norris <computersforpeace@gmail.com> +Acked-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> +Tested-by: Daniel Mack <zonque@gmail.com> +--- + drivers/mtd/nand/pxa3xx_nand.c | 15 ++++++++++++--- + 1 file changed, 12 insertions(+), 3 deletions(-) + +--- a/drivers/mtd/nand/pxa3xx_nand.c ++++ b/drivers/mtd/nand/pxa3xx_nand.c +@@ -1364,9 +1364,13 @@ static int pxa_ecc_init(struct pxa3xx_na + + static int armada370_ecc_init(struct pxa3xx_nand_info *info, + struct nand_ecc_ctrl *ecc, +- int strength, int page_size) ++ int strength, int ecc_stepsize, int page_size) + { +- if (strength == 4 && page_size == 4096) { ++ /* ++ * Required ECC: 4-bit correction per 512 bytes ++ * Select: 16-bit correction per 2048 bytes ++ */ ++ if (strength == 4 && ecc_stepsize == 512 && page_size == 4096) { + info->ecc_bch = 1; + info->chunk_size = 2048; + info->spare_size = 32; +@@ -1377,7 +1381,11 @@ static int armada370_ecc_init(struct pxa + ecc->strength = 16; + return 1; + +- } else if (strength == 8 && page_size == 4096) { ++ /* ++ * Required ECC: 8-bit correction per 512 bytes ++ * Select: 16-bit correction per 1024 bytes ++ */ ++ } else if (strength == 8 && ecc_stepsize == 512 && page_size == 4096) { + info->ecc_bch = 1; + info->chunk_size = 1024; + info->spare_size = 0; +@@ -1485,6 +1493,7 @@ KEEP_CONFIG: + if (info->variant == PXA3XX_NAND_VARIANT_ARMADA370) + ret = armada370_ecc_init(info, &chip->ecc, + chip->ecc_strength_ds, ++ chip->ecc_step_ds, + mtd->writesize); + else + ret = pxa_ecc_init(info, &chip->ecc, |