X-Git-Url: http://git.rohieb.name/openwrt.git/blobdiff_plain/2b55ad4ab5c8217505df86d8f156c61afd8d1473..729010e333a053b8399d4f021e35d4d1ac3281fb:/target/linux/xburst/patches-3.2/0003-NAND-Optimize-NAND_ECC_HW_OOB_FIRST-read.patch

diff --git a/target/linux/xburst/patches-3.2/0003-NAND-Optimize-NAND_ECC_HW_OOB_FIRST-read.patch b/target/linux/xburst/patches-3.2/0003-NAND-Optimize-NAND_ECC_HW_OOB_FIRST-read.patch
new file mode 100644
index 000000000..b92c967e1
--- /dev/null
+++ b/target/linux/xburst/patches-3.2/0003-NAND-Optimize-NAND_ECC_HW_OOB_FIRST-read.patch
@@ -0,0 +1,45 @@
+From b971c50dc50c07f981a1619f977e7509db9c4eac Mon Sep 17 00:00:00 2001
+From: Lars-Peter Clausen <lars@metafoo.de>
+Date: Sat, 26 Feb 2011 15:30:07 +0100
+Subject: [PATCH 03/21] NAND: Optimize NAND_ECC_HW_OOB_FIRST read
+
+Avoid sending unnecessary READ commands to the chip.
+---
+ drivers/mtd/nand/nand_base.c |   14 ++++++++++----
+ 1 files changed, 10 insertions(+), 4 deletions(-)
+
+diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
+index 3ed9c5e..184aa93 100644
+--- a/drivers/mtd/nand/nand_base.c
++++ b/drivers/mtd/nand/nand_base.c
+@@ -1294,9 +1294,15 @@ static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
+ 	uint8_t *ecc_calc = chip->buffers->ecccalc;
+ 
+ 	/* Read the OOB area first */
+-	chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
+-	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
+-	chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
++	if (mtd->writesize > 512) {
++		chip->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page);
++		chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
++		chip->cmdfunc(mtd, NAND_CMD_RNDOUT, 0, -1);
++	} else {
++		chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
++		chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
++		chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
++	}
+ 
+ 	for (i = 0; i < chip->ecc.total; i++)
+ 		ecc_code[i] = chip->oob_poi[eccpos[i]];
+@@ -1465,7 +1471,7 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
+ 		if (realpage != chip->pagebuf || oob) {
+ 			bufpoi = aligned ? buf : chip->buffers->databuf;
+ 
+-			if (likely(sndcmd)) {
++			if (likely(sndcmd) && chip->ecc.mode != NAND_ECC_HW_OOB_FIRST) {
+ 				chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
+ 				sndcmd = 0;
+ 			}
+-- 
+1.7.5.4
+