Commit b9d013c0 authored by Marc Gonzalez's avatar Marc Gonzalez Committed by Greg Kroah-Hartman

mtd: nand: tango: Update ecc_stats.corrected

commit 60cf0ce1 upstream.

According to Boris, some user-space tools expect MTD drivers to
update ecc_stats.corrected, and it's better to provide a lower
bound than to provide no information at all.

Fixes: 6956e238 ("mtd: nand: add tango NAND flash controller support")
Reported-by: default avatarPavel Machek <pavel@ucw.cz>
Signed-off-by: default avatarMarc Gonzalez <marc_gonzalez@sigmadesigns.com>
Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6d916021
......@@ -55,10 +55,10 @@
* byte 1 for other packets in the page (PKT_N, for N > 0)
* ERR_COUNT_PKT_N is the max error count over all but the first packet.
*/
#define DECODE_OK_PKT_0(v) ((v) & BIT(7))
#define DECODE_OK_PKT_N(v) ((v) & BIT(15))
#define ERR_COUNT_PKT_0(v) (((v) >> 0) & 0x3f)
#define ERR_COUNT_PKT_N(v) (((v) >> 8) & 0x3f)
#define DECODE_FAIL_PKT_0(v) (((v) & BIT(7)) == 0)
#define DECODE_FAIL_PKT_N(v) (((v) & BIT(15)) == 0)
/* Offsets relative to pbus_base */
#define PBUS_CS_CTRL 0x83c
......@@ -193,6 +193,8 @@ static int check_erased_page(struct nand_chip *chip, u8 *buf)
chip->ecc.strength);
if (res < 0)
mtd->ecc_stats.failed++;
else
mtd->ecc_stats.corrected += res;
bitflips = max(res, bitflips);
buf += pkt_size;
......@@ -202,9 +204,11 @@ static int check_erased_page(struct nand_chip *chip, u8 *buf)
return bitflips;
}
static int decode_error_report(struct tango_nfc *nfc)
static int decode_error_report(struct nand_chip *chip)
{
u32 status, res;
struct mtd_info *mtd = nand_to_mtd(chip);
struct tango_nfc *nfc = to_tango_nfc(chip->controller);
status = readl_relaxed(nfc->reg_base + NFC_XFER_STATUS);
if (status & PAGE_IS_EMPTY)
......@@ -212,10 +216,14 @@ static int decode_error_report(struct tango_nfc *nfc)
res = readl_relaxed(nfc->mem_base + ERROR_REPORT);
if (DECODE_OK_PKT_0(res) && DECODE_OK_PKT_N(res))
return max(ERR_COUNT_PKT_0(res), ERR_COUNT_PKT_N(res));
if (DECODE_FAIL_PKT_0(res) || DECODE_FAIL_PKT_N(res))
return -EBADMSG;
/* ERR_COUNT_PKT_N is max, not sum, but that's all we have */
mtd->ecc_stats.corrected +=
ERR_COUNT_PKT_0(res) + ERR_COUNT_PKT_N(res);
return -EBADMSG;
return max(ERR_COUNT_PKT_0(res), ERR_COUNT_PKT_N(res));
}
static void tango_dma_callback(void *arg)
......@@ -280,7 +288,7 @@ static int tango_read_page(struct mtd_info *mtd, struct nand_chip *chip,
if (err)
return err;
res = decode_error_report(nfc);
res = decode_error_report(chip);
if (res < 0) {
chip->ecc.read_oob_raw(mtd, chip, page);
res = check_erased_page(chip, buf);
......
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