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From c7c6a0f50f9ac3620c611ce06ba1f9fafea0444e Mon Sep 17 00:00:00 2001
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From: Archit Taneja <architt@codeaurora.org>
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Date: Mon, 3 Aug 2015 10:38:14 +0530
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Subject: [PATCH 47/69] mtd: nand: Create a BBT flag to access bad block
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markers in raw mode
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Some controllers can access the factory bad block marker from OOB only
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when they read it in raw mode. When ECC is enabled, these controllers
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discard reading/writing bad block markers, preventing access to them
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altogether.
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The bbt driver assumes MTD_OPS_PLACE_OOB when scanning for bad blocks.
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This results in the nand driver's ecc->read_oob() op to be called, which
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works with ECC enabled.
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Create a new BBT option flag that tells nand_bbt to force the mode to
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MTD_OPS_RAW. This would result in the correct op being called for the
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underlying nand controller driver.
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Reviewed-by: Andy Gross <agross@codeaurora.org>
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Signed-off-by: Archit Taneja <architt@codeaurora.org>
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---
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drivers/mtd/nand/nand_base.c | 6 +++++-
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drivers/mtd/nand/nand_bbt.c | 6 +++++-
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include/linux/mtd/bbm.h | 6 ++++++
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3 files changed, 16 insertions(+), 2 deletions(-)
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--- a/drivers/mtd/nand/nand_base.c
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+++ b/drivers/mtd/nand/nand_base.c
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@@ -481,7 +481,11 @@ static int nand_default_block_markbad(st
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} else {
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ops.len = ops.ooblen = 1;
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}
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- ops.mode = MTD_OPS_PLACE_OOB;
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+
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+ if (unlikely(chip->bbt_options & NAND_BBT_ACCESS_BBM_RAW))
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+ ops.mode = MTD_OPS_RAW;
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+ else
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+ ops.mode = MTD_OPS_PLACE_OOB;
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/* Write to first/last page(s) if necessary */
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if (chip->bbt_options & NAND_BBT_SCANLASTPAGE)
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--- a/drivers/mtd/nand/nand_bbt.c
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+++ b/drivers/mtd/nand/nand_bbt.c
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@@ -420,7 +420,11 @@ static int scan_block_fast(struct mtd_in
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ops.oobbuf = buf;
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ops.ooboffs = 0;
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ops.datbuf = NULL;
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- ops.mode = MTD_OPS_PLACE_OOB;
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+
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+ if (unlikely(bd->options & NAND_BBT_ACCESS_BBM_RAW))
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+ ops.mode = MTD_OPS_RAW;
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+ else
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+ ops.mode = MTD_OPS_PLACE_OOB;
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for (j = 0; j < numpages; j++) {
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/*
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--- a/include/linux/mtd/bbm.h
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+++ b/include/linux/mtd/bbm.h
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@@ -116,6 +116,12 @@ struct nand_bbt_descr {
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#define NAND_BBT_NO_OOB_BBM 0x00080000
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/*
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+ * Force MTD_OPS_RAW mode when trying to access bad block markes from OOB. To
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+ * be used by controllers which can access BBM only when ECC is disabled, i.e,
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+ * when in RAW access mode
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+ */
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+#define NAND_BBT_ACCESS_BBM_RAW 0x00100000
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+/*
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* Flag set by nand_create_default_bbt_descr(), marking that the nand_bbt_descr
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* was allocated dynamicaly and must be freed in nand_release(). Has no meaning
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* in nand_chip.bbt_options.
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