+ Markus Pargmann On Wed, Dec 02, 2015 at 04:47:45PM -0600, Han Xu wrote: > i.MX6QP and i.MX7D BCH module integrated a new feature to detect the > bitflip number for erased NAND page. So for these two platform, set the > erase threshold to ecc_strength and if bitflip detected, GPMI driver will > correct the data to all 0xFF.
Looks like Marcus is also trying to add SW correction for the same issue: http://patchwork.ozlabs.org/patch/559557/ How do those 2 interact (if at all)? Brian > Signed-off-by: Han Xu <b45...@freescale.com> > --- > drivers/mtd/nand/gpmi-nand/bch-regs.h | 10 ++++++++++ > drivers/mtd/nand/gpmi-nand/gpmi-lib.c | 5 +++++ > drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 24 +++++++++++++++++++++++- > drivers/mtd/nand/gpmi-nand/gpmi-nand.h | 5 ++++- > 4 files changed, 42 insertions(+), 2 deletions(-) > > diff --git a/drivers/mtd/nand/gpmi-nand/bch-regs.h > b/drivers/mtd/nand/gpmi-nand/bch-regs.h > index 53e58bc..a84d72b 100644 > --- a/drivers/mtd/nand/gpmi-nand/bch-regs.h > +++ b/drivers/mtd/nand/gpmi-nand/bch-regs.h > @@ -30,7 +30,13 @@ > #define BM_BCH_CTRL_COMPLETE_IRQ (1 << 0) > > #define HW_BCH_STATUS0 0x00000010 > + > #define HW_BCH_MODE 0x00000020 > +#define BP_BCH_MODE_ERASE_THRESHOLD 0 > +#define BM_BCH_MODE_ERASE_THRESHOLD (0xff << BP_BCH_MODE_ERASE_THRESHOLD) > +#define BF_BCH_MODE_ERASE_THRESHOLD(v) \ > + (((v) << BP_BCH_MODE_ERASE_THRESHOLD) & BM_BCH_MODE_ERASE_THRESHOLD) > + > #define HW_BCH_ENCODEPTR 0x00000030 > #define HW_BCH_DATAPTR 0x00000040 > #define HW_BCH_METAPTR 0x00000050 > @@ -125,4 +131,8 @@ > ) > > #define HW_BCH_VERSION 0x00000160 > +#define HW_BCH_DEBUG1 0x00000170 > +#define BP_BCH_DEBUG1_ERASED_ZERO_COUNT 0 > +#define BM_BCH_DEBUG1_ERASED_ZERO_COUNT \ > + (0x1ff << BP_BCH_DEBUG1_ERASED_ZERO_COUNT) > #endif > diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c > b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c > index 1f26a79..0548d84 100644 > --- a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c > +++ b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c > @@ -298,6 +298,11 @@ int bch_set_geometry(struct gpmi_nand_data *this) > | BF_BCH_FLASH0LAYOUT1_DATAN_SIZE(block_size, this), > r->bch_regs + HW_BCH_FLASH0LAYOUT1); > > + /* Set erase threshold to ecc_strength for mx6qp and mx7 */ > + if (GPMI_IS_MX6QP(this) || GPMI_IS_MX7(this)) > + writel(BF_BCH_MODE_ERASE_THRESHOLD(ecc_strength), > + r->bch_regs + HW_BCH_MODE); > + > /* Set *all* chip selects to use layout 0. */ > writel(0, r->bch_regs + HW_BCH_LAYOUTSELECT); > > diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c > b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c > index 9f67f0f..9dea56e 100644 > --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c > +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c > @@ -71,6 +71,12 @@ static const struct gpmi_devdata gpmi_devdata_imx6q = { > .max_chain_delay = 12, > }; > > +static const struct gpmi_devdata gpmi_devdata_imx6qp = { > + .type = IS_MX6QP, > + .bch_max_ecc_strength = 40, > + .max_chain_delay = 12, > +}; > + > static const struct gpmi_devdata gpmi_devdata_imx6sx = { > .type = IS_MX6SX, > .bch_max_ecc_strength = 62, > @@ -1010,6 +1016,7 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, > struct nand_chip *chip, > { > struct gpmi_nand_data *this = chip->priv; > struct bch_geometry *nfc_geo = &this->bch_geometry; > + void __iomem *bch_regs = this->resources.bch_regs; > void *payload_virt; > dma_addr_t payload_phys; > void *auxiliary_virt; > @@ -1018,6 +1025,7 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, > struct nand_chip *chip, > unsigned char *status; > unsigned int max_bitflips = 0; > int ret; > + int flag = 0; > > dev_dbg(this->dev, "page number is : %d\n", page); > ret = read_page_prepare(this, buf, nfc_geo->payload_size, > @@ -1050,9 +1058,16 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, > struct nand_chip *chip, > status = auxiliary_virt + nfc_geo->auxiliary_status_offset; > > for (i = 0; i < nfc_geo->ecc_chunk_count; i++, status++) { > - if ((*status == STATUS_GOOD) || (*status == STATUS_ERASED)) > + if (*status == STATUS_GOOD) > continue; > > + if (*status == STATUS_ERASED) { > + if (GPMI_IS_MX6QP(this) || GPMI_IS_MX7(this)) > + if (readl(bch_regs + HW_BCH_DEBUG1)) > + flag = 1; > + continue; > + } > + > if (*status == STATUS_UNCORRECTABLE) { > mtd->ecc_stats.failed++; > continue; > @@ -1081,6 +1096,10 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, > struct nand_chip *chip, > nfc_geo->payload_size, > payload_virt, payload_phys); > > + /* if bitflip occurred in erased page, change data to all 0xff */ > + if (flag) > + memset(buf, 0xff, nfc_geo->payload_size); > + > return max_bitflips; > } > > @@ -1990,6 +2009,9 @@ static const struct of_device_id gpmi_nand_id_table[] = > { > .compatible = "fsl,imx6q-gpmi-nand", > .data = &gpmi_devdata_imx6q, > }, { > + .compatible = "fsl,imx6qp-gpmi-nand", > + .data = (void *)&gpmi_devdata_imx6qp, > + }, { > .compatible = "fsl,imx6sx-gpmi-nand", > .data = &gpmi_devdata_imx6sx, > }, { > diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h > b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h > index 58b3d69..149a442 100644 > --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h > +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h > @@ -123,6 +123,7 @@ enum gpmi_type { > IS_MX23, > IS_MX28, > IS_MX6Q, > + IS_MX6QP, > IS_MX6SX, > IS_MX7D, > }; > @@ -306,9 +307,11 @@ void gpmi_copy_bits(u8 *dst, size_t dst_bit_off, > #define GPMI_IS_MX23(x) ((x)->devdata->type == IS_MX23) > #define GPMI_IS_MX28(x) ((x)->devdata->type == IS_MX28) > #define GPMI_IS_MX6Q(x) ((x)->devdata->type == IS_MX6Q) > +#define GPMI_IS_MX6QP(x) ((x)->devdata->type == IS_MX6QP) > #define GPMI_IS_MX6SX(x) ((x)->devdata->type == IS_MX6SX) > #define GPMI_IS_MX7D(x) ((x)->devdata->type == IS_MX7D) > > -#define GPMI_IS_MX6(x) (GPMI_IS_MX6Q(x) || GPMI_IS_MX6SX(x)) > +#define GPMI_IS_MX6(x) (GPMI_IS_MX6Q(x) || GPMI_IS_MX6QP(x)\ > + || GPMI_IS_MX6SX(x)) > #define GPMI_IS_MX7(x) (GPMI_IS_MX7D(x)) > #endif > -- > 1.9.1 >
