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mtd: nand: gpmi: Fix subpage reads 

Commit 25f815f66a ("mtd: nand: force drivers to explicitly send
READ/PROG commands") added a call to nand_read_page_op() in
gpmi_ecc_read_page(), which means this function now sends a READ0
command and place the data pointer at the beginning of the page. This
logic is breaking gpmi_ecc_read_subpage() which was calling
gpmi_ecc_read_page() and expected it to only retrieve the data without
sending the READ0 command.

Create a gpmi_ecc_read_page_data() helper which only does the data
retrieval and ECC correction steps and implement gpmi_ecc_read_page()
as a wrapper that calls nand_read_page_op()+gpmi_ecc_read_page_data().

This way, gpmi_ecc_read_subpage() can call gpmi_ecc_read_page_data()
which restores the logic we had before commit 25f815f66a ("mtd: nand:
force drivers to explicitly send READ/PROG commands").

Fixes: 25f815f66a ("mtd: nand: force drivers to explicitly send READ/PROG commands")
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Acked-by: Han Xu <han.xu@nxp.com>
This commit is contained in:
Boris Brezillon 2018-01-23 11:13:17 +01:00
parent c1a72e2dbb
commit 4c7e95b1b3
1 changed files with 13 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/mtd/nand/gpmi-nand/gpmi-nand.c
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@ -1029,11 +1029,13 @@ static void block_mark_swapping(struct gpmi_nand_data *this,
p[1] = (p[1] & mask) | (from_oob >> (8 - bit));
}
static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf, int oob_required, int page)
static int gpmi_ecc_read_page_data(struct nand_chip *chip,
uint8_t *buf, int oob_required,
int page)
{
struct gpmi_nand_data *this = nand_get_controller_data(chip);
struct bch_geometry *nfc_geo = &this->bch_geometry;
struct mtd_info *mtd = nand_to_mtd(chip);
void *payload_virt;
dma_addr_t payload_phys;
void *auxiliary_virt;
@ -1043,8 +1045,6 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
unsigned int max_bitflips = 0;
int ret;
nand_read_page_op(chip, page, 0, NULL, 0);
dev_dbg(this->dev, "page number is : %d\n", page);
ret = read_page_prepare(this, buf, nfc_geo->payload_size,
this->payload_virt, this->payload_phys,
@ -1178,6 +1178,14 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
return max_bitflips;
}
static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf, int oob_required, int page)
{
nand_read_page_op(chip, page, 0, NULL, 0);
return gpmi_ecc_read_page_data(chip, buf, oob_required, page);
}
/* Fake a virtual small page for the subpage read */
static int gpmi_ecc_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
uint32_t offs, uint32_t len, uint8_t *buf, int page)
@ -1256,7 +1264,7 @@ static int gpmi_ecc_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
/* Read the subpage now */
this->swap_block_mark = false;
max_bitflips = gpmi_ecc_read_page(mtd, chip, buf, 0, page);
max_bitflips = gpmi_ecc_read_page_data(chip, buf, 0, page);
/* Restore */
writel(r1_old, bch_regs + HW_BCH_FLASH0LAYOUT0);