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mtd: nand: cleanup ONFI printed errors, warnings

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The ONFI detection routine is too verbose in some cases and not verbose
enough in others. This patch refactors it to print only when there are
significant warnings/errors.

Probing in 16-bit mode:
  It is unnecessary to print until after the READID (address 20h)
  command. READID *has* to work properly in whatever bus width
  configuration we are in, or else no identification mode works. So we
  can silence some useless warnings on systems which come up in 16-bit
  mode and do not even respond with an O-N-F-I string.

Valid parameter page:
  Nobody needs to see this. Do we inform the user every time other
  hardware responds properly? Instead, add an error message if *no*
  uncorrupted parameter pages are found.

ONFI ECC:
  Most drivers don't yet use the reported minimum ECC values, so it
  shouldn't yet be a fatal condition if the extended parameter page is
  incorrect. But we should at least give a warning for the corner cases
  that we don't expect.

ONFI flash detected:
  Nobody needs to see this. This is the expected case, that we detect
  ONFI properly, or else it wasn't ONFI-compliant and is detected by
  some other routine.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Cc: Huang Shijie <b32955@freescale.com>
Cc: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
This commit is contained in:
Brian Norris 2013-08-13 10:51:55 -07:00
parent 535ab90334
commit c7f23a7063
1 changed files with 15 additions and 9 deletions
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24
drivers/mtd/nand/nand_base.c
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@ -2935,29 +2935,34 @@ static int nand_flash_detect_onfi(struct mtd_info *mtd, struct nand_chip *chip,
int i;
int val;
/* ONFI need to be probed in 8 bits mode, and 16 bits should be selected with NAND_BUSWIDTH_AUTO */
if (chip->options & NAND_BUSWIDTH_16) {
pr_err("Trying ONFI probe in 16 bits mode, aborting !\n");
return 0;
}
/* Try ONFI for unknown chip or LP */
chip->cmdfunc(mtd, NAND_CMD_READID, 0x20, -1);
if (chip->read_byte(mtd) != 'O' || chip->read_byte(mtd) != 'N' ||
chip->read_byte(mtd) != 'F' || chip->read_byte(mtd) != 'I')
return 0;
/*
* ONFI must be probed in 8-bit mode or with NAND_BUSWIDTH_AUTO, not
* with NAND_BUSWIDTH_16
*/
if (chip->options & NAND_BUSWIDTH_16) {
pr_err("ONFI cannot be probed in 16-bit mode; aborting\n");
return 0;
}
chip->cmdfunc(mtd, NAND_CMD_PARAM, 0, -1);
for (i = 0; i < 3; i++) {
chip->read_buf(mtd, (uint8_t *)p, sizeof(*p));
if (onfi_crc16(ONFI_CRC_BASE, (uint8_t *)p, 254) ==
le16_to_cpu(p->crc)) {
pr_info("ONFI param page %d valid\n", i);
break;
}
}
if (i == 3)
if (i == 3) {
pr_err("Could not find valid ONFI parameter page; aborting\n");
return 0;
}
/* Check version */
val = le16_to_cpu(p->revision);
@ -3009,10 +3014,11 @@ static int nand_flash_detect_onfi(struct mtd_info *mtd, struct nand_chip *chip,
/* The Extended Parameter Page is supported since ONFI 2.1. */
if (nand_flash_detect_ext_param_page(mtd, chip, p))
pr_info("Failed to detect the extended param page.\n");
pr_warn("Failed to detect ONFI extended param page\n");
} else {
pr_warn("Could not retrieve ONFI ECC requirements\n");
}
pr_info("ONFI flash detected\n");
return 1;
}