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authorFelix Fietkau <nbd@openwrt.org>2015-08-07 08:36:31 +0000
committerFelix Fietkau <nbd@openwrt.org>2015-08-07 08:36:31 +0000
commitd523866eb39d8957fa16e05ebabf04101bfb5f85 (patch)
treef65a1d5f5f46c64ba2e4b3f4f7602e6b300fec7c /target/linux/ipq806x/patches-3.18/161-mtd-nand-Create-a-BBT-flag-to-access-bad-block-markers-in-raw-mode.patch
parentc7bf2accc94e081fab0c595c7e5ddd70cfe6b0c1 (diff)
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ipq806x: add NAND flash controller support
These patches add support for ipq806x NAND flash controller. Most of these are cherry-picked & backported from LKML: *https://lkml.org/lkml/2015/8/3/16 This patch just modifies the kernel code, but doesn't change the config. It should be harmless. Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org> SVN-Revision: 46568
Diffstat (limited to 'target/linux/ipq806x/patches-3.18/161-mtd-nand-Create-a-BBT-flag-to-access-bad-block-markers-in-raw-mode.patch')
-rw-r--r--target/linux/ipq806x/patches-3.18/161-mtd-nand-Create-a-BBT-flag-to-access-bad-block-markers-in-raw-mode.patch84
1 files changed, 84 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches-3.18/161-mtd-nand-Create-a-BBT-flag-to-access-bad-block-markers-in-raw-mode.patch b/target/linux/ipq806x/patches-3.18/161-mtd-nand-Create-a-BBT-flag-to-access-bad-block-markers-in-raw-mode.patch
new file mode 100644
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--- /dev/null
+++ b/target/linux/ipq806x/patches-3.18/161-mtd-nand-Create-a-BBT-flag-to-access-bad-block-markers-in-raw-mode.patch
@@ -0,0 +1,84 @@
+Content-Type: text/plain; charset="utf-8"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+Subject: [v3,
+ 1/5] mtd: nand: Create a BBT flag to access bad block markers in raw
+ mode
+From: Archit Taneja <architt@codeaurora.org>
+X-Patchwork-Id: 6927081
+Message-Id: <1438578498-32254-2-git-send-email-architt@codeaurora.org>
+To: linux-mtd@lists.infradead.org, dehrenberg@google.com,
+ cernekee@gmail.com, computersforpeace@gmail.com
+Cc: linux-arm-msm@vger.kernel.org, agross@codeaurora.org,
+ sboyd@codeaurora.org, linux-kernel@vger.kernel.org,
+ Archit Taneja <architt@codeaurora.org>
+Date: Mon, 3 Aug 2015 10:38:14 +0530
+
+Some controllers can access the factory bad block marker from OOB only
+when they read it in raw mode. When ECC is enabled, these controllers
+discard reading/writing bad block markers, preventing access to them
+altogether.
+
+The bbt driver assumes MTD_OPS_PLACE_OOB when scanning for bad blocks.
+This results in the nand driver's ecc->read_oob() op to be called, which
+works with ECC enabled.
+
+Create a new BBT option flag that tells nand_bbt to force the mode to
+MTD_OPS_RAW. This would result in the correct op being called for the
+underlying nand controller driver.
+
+Reviewed-by: Andy Gross <agross@codeaurora.org>
+Signed-off-by: Archit Taneja <architt@codeaurora.org>
+
+---
+drivers/mtd/nand/nand_base.c | 6 +++++-
+ drivers/mtd/nand/nand_bbt.c | 6 +++++-
+ include/linux/mtd/bbm.h | 7 +++++++
+ 3 files changed, 17 insertions(+), 2 deletions(-)
+
+--- a/drivers/mtd/nand/nand_base.c
++++ b/drivers/mtd/nand/nand_base.c
+@@ -396,7 +396,11 @@ static int nand_default_block_markbad(st
+ } else {
+ ops.len = ops.ooblen = 1;
+ }
+- ops.mode = MTD_OPS_PLACE_OOB;
++
++ if (unlikely(chip->bbt_options & NAND_BBT_ACCESS_BBM_RAW))
++ ops.mode = MTD_OPS_RAW;
++ else
++ ops.mode = MTD_OPS_PLACE_OOB;
+
+ /* Write to first/last page(s) if necessary */
+ if (chip->bbt_options & NAND_BBT_SCANLASTPAGE)
+--- a/drivers/mtd/nand/nand_bbt.c
++++ b/drivers/mtd/nand/nand_bbt.c
+@@ -423,7 +423,11 @@ static int scan_block_fast(struct mtd_in
+ ops.oobbuf = buf;
+ ops.ooboffs = 0;
+ ops.datbuf = NULL;
+- ops.mode = MTD_OPS_PLACE_OOB;
++
++ if (unlikely(bd->options & NAND_BBT_ACCESS_BBM_RAW))
++ ops.mode = MTD_OPS_RAW;
++ else
++ ops.mode = MTD_OPS_PLACE_OOB;
+
+ for (j = 0; j < numpages; j++) {
+ /*
+--- a/include/linux/mtd/bbm.h
++++ b/include/linux/mtd/bbm.h
+@@ -116,6 +116,13 @@ struct nand_bbt_descr {
+ #define NAND_BBT_NO_OOB_BBM 0x00080000
+
+ /*
++ * Force MTD_OPS_RAW mode when trying to access bad block markes from OOB. To
++ * be used by controllers which can access BBM only when ECC is disabled, i.e,
++ * when in RAW access mode
++ */
++#define NAND_BBT_ACCESS_BBM_RAW 0x00100000
++
++/*
+ * Flag set by nand_create_default_bbt_descr(), marking that the nand_bbt_descr
+ * was allocated dynamicaly and must be freed in nand_release(). Has no meaning
+ * in nand_chip.bbt_options.