OpenWrt – Blame information for rev 4
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4 | office | 1 | From c7c6a0f50f9ac3620c611ce06ba1f9fafea0444e Mon Sep 17 00:00:00 2001 |
2 | From: Archit Taneja <architt@codeaurora.org> |
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3 | Date: Mon, 3 Aug 2015 10:38:14 +0530 |
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4 | Subject: [PATCH 47/69] mtd: nand: Create a BBT flag to access bad block |
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5 | markers in raw mode |
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6 | |||
7 | Some controllers can access the factory bad block marker from OOB only |
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8 | when they read it in raw mode. When ECC is enabled, these controllers |
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9 | discard reading/writing bad block markers, preventing access to them |
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10 | altogether. |
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11 | |||
12 | The bbt driver assumes MTD_OPS_PLACE_OOB when scanning for bad blocks. |
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13 | This results in the nand driver's ecc->read_oob() op to be called, which |
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14 | works with ECC enabled. |
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15 | |||
16 | Create a new BBT option flag that tells nand_bbt to force the mode to |
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17 | MTD_OPS_RAW. This would result in the correct op being called for the |
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18 | underlying nand controller driver. |
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19 | |||
20 | Reviewed-by: Andy Gross <agross@codeaurora.org> |
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21 | Signed-off-by: Archit Taneja <architt@codeaurora.org> |
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22 | --- |
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23 | drivers/mtd/nand/nand_base.c | 6 +++++- |
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24 | drivers/mtd/nand/nand_bbt.c | 6 +++++- |
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25 | include/linux/mtd/bbm.h | 6 ++++++ |
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26 | 3 files changed, 16 insertions(+), 2 deletions(-) |
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27 | |||
28 | --- a/drivers/mtd/nand/nand_base.c |
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29 | +++ b/drivers/mtd/nand/nand_base.c |
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30 | @@ -481,7 +481,11 @@ static int nand_default_block_markbad(st |
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31 | } else { |
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32 | ops.len = ops.ooblen = 1; |
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33 | } |
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34 | - ops.mode = MTD_OPS_PLACE_OOB; |
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35 | + |
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36 | + if (unlikely(chip->bbt_options & NAND_BBT_ACCESS_BBM_RAW)) |
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37 | + ops.mode = MTD_OPS_RAW; |
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38 | + else |
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39 | + ops.mode = MTD_OPS_PLACE_OOB; |
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40 | |||
41 | /* Write to first/last page(s) if necessary */ |
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42 | if (chip->bbt_options & NAND_BBT_SCANLASTPAGE) |
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43 | --- a/drivers/mtd/nand/nand_bbt.c |
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44 | +++ b/drivers/mtd/nand/nand_bbt.c |
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45 | @@ -420,7 +420,11 @@ static int scan_block_fast(struct mtd_in |
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46 | ops.oobbuf = buf; |
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47 | ops.ooboffs = 0; |
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48 | ops.datbuf = NULL; |
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49 | - ops.mode = MTD_OPS_PLACE_OOB; |
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50 | + |
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51 | + if (unlikely(bd->options & NAND_BBT_ACCESS_BBM_RAW)) |
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52 | + ops.mode = MTD_OPS_RAW; |
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53 | + else |
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54 | + ops.mode = MTD_OPS_PLACE_OOB; |
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55 | |||
56 | for (j = 0; j < numpages; j++) { |
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57 | /* |
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58 | --- a/include/linux/mtd/bbm.h |
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59 | +++ b/include/linux/mtd/bbm.h |
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60 | @@ -116,6 +116,12 @@ struct nand_bbt_descr { |
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61 | #define NAND_BBT_NO_OOB_BBM 0x00080000 |
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62 | |||
63 | /* |
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64 | + * Force MTD_OPS_RAW mode when trying to access bad block markes from OOB. To |
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65 | + * be used by controllers which can access BBM only when ECC is disabled, i.e, |
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66 | + * when in RAW access mode |
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67 | + */ |
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68 | +#define NAND_BBT_ACCESS_BBM_RAW 0x00100000 |
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69 | +/* |
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70 | * Flag set by nand_create_default_bbt_descr(), marking that the nand_bbt_descr |
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71 | * was allocated dynamicaly and must be freed in nand_release(). Has no meaning |
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72 | * in nand_chip.bbt_options. |