1 files changed, 63 insertions, 0 deletions

diff --git a/extras/recipes-kernel/linux/linux-omap-2.6.39/sakoman/0027-omap-nand-fix-subpage-ecc-issue-with-prefetch.patch b/extras/recipes-kernel/linux/linux-omap-2.6.39/sakoman/0027-omap-nand-fix-subpage-ecc-issue-with-prefetch.patch
new file mode 100644
index 00000000..21eb1e9f
--- /dev/null
+++ b/extras/recipes-kernel/linux/linux-omap-2.6.39/sakoman/0027-omap-nand-fix-subpage-ecc-issue-with-prefetch.patch
@@ -0,0 +1,63 @@
+From fb4dfff6a6e107e0e526801e7add4a9aaeab1eab Mon Sep 17 00:00:00 2001
+From: kishore kadiyala <kishore.kadiyala@ti.com>
+Date: Mon, 2 May 2011 11:10:38 +0000
+Subject: [PATCH 27/32] omap : nand : fix subpage ecc issue with prefetch
+
+For prefetch engine, read and write  got broken in commit '2c01946c'.
+We never hit a scenario of not getting 'gpmc_prefetch_enable'
+call success.
+When reading/writing a subpage with a non divisible by 4 ecc number
+of bytes, the mis-aligned bytes gets handled first before enabling
+the Prefetch engine, then it reads/writes rest of the bytes.
+
+Signed-off-by: Kishore Kadiyala <kishore.kadiyala@ti.com>
+Signed-off-by: Vimal Singh <vimal.newwork@gmail.com>
+Reported-by: Bryan DE FARIA <bdefaria@adeneo-embedded.com>
+---
+ drivers/mtd/nand/omap2.c |   12 +++++-------
+ 1 files changed, 5 insertions(+), 7 deletions(-)
+
+diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
+index 832f111..471a39b 100644
+--- a/drivers/mtd/nand/omap2.c
++++ b/drivers/mtd/nand/omap2.c
+@@ -275,11 +275,10 @@ static void omap_read_buf_pref(struct mtd_info *mtd, u_char *buf, int len)
+        if (ret) {
+                /* PFPW engine is busy, use cpu copy method */
+                if (info->nand.options & NAND_BUSWIDTH_16)
+-                       omap_read_buf16(mtd, buf, len);
++                       omap_read_buf16(mtd, (u_char *)p, len);
+                else
+-                       omap_read_buf8(mtd, buf, len);
++                       omap_read_buf8(mtd, (u_char *)p, len);
+        } else {
+-               p = (u32 *) buf;
+                do {
+                        r_count = gpmc_read_status(GPMC_PREFETCH_FIFO_CNT);
+                        r_count = r_count >> 2;
+@@ -305,7 +304,7 @@ static void omap_write_buf_pref(struct mtd_info *mtd,
+                                                struct omap_nand_info, mtd);
+        uint32_t w_count = 0;
+        int i = 0, ret = 0;
+-       u16 *p;
++       u16 *p = (u16 *)buf;
+        unsigned long tim, limit;
+ 
+        /* take care of subpage writes */
+@@ -321,11 +320,10 @@ static void omap_write_buf_pref(struct mtd_info *mtd,
+        if (ret) {
+                /* PFPW engine is busy, use cpu copy method */
+                if (info->nand.options & NAND_BUSWIDTH_16)
+-                       omap_write_buf16(mtd, buf, len);
++                       omap_write_buf16(mtd, (u_char *)p, len);
+                else
+-                       omap_write_buf8(mtd, buf, len);
++                       omap_write_buf8(mtd, (u_char *)p, len);
+        } else {
+-               p = (u16 *) buf;
+                while (len) {
+                        w_count = gpmc_read_status(GPMC_PREFETCH_FIFO_CNT);
+                        w_count = w_count >> 1;
+-- 
+1.6.6.1
+