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45 lines
1.6 KiB
45 lines
1.6 KiB
From f2b7099d3986e59aab5792cecc052e440caf2cdd Mon Sep 17 00:00:00 2001
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From: Lars-Peter Clausen <lars@metafoo.de>
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Date: Sat, 26 Feb 2011 15:30:07 +0100
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Subject: [PATCH 02/16] NAND: Optimize NAND_ECC_HW_OOB_FIRST read
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Avoid sending unnecessary READ commands to the chip.
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Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
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---
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drivers/mtd/nand/nand_base.c | 17 +++++++++++++----
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1 file changed, 13 insertions(+), 4 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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@@ -1278,9 +1278,16 @@ static int nand_read_page_hwecc_oob_firs
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unsigned int max_bitflips = 0;
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/* Read the OOB area first */
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- chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
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- chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
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- chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
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+ /* Read the OOB area first */
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+ if (mtd->writesize > 512) {
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+ chip->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page);
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+ chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
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+ chip->cmdfunc(mtd, NAND_CMD_RNDOUT, 0, -1);
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+ } else {
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+ chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
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+ chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
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+ chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
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+ }
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for (i = 0; i < chip->ecc.total; i++)
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ecc_code[i] = chip->oob_poi[eccpos[i]];
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@@ -1455,7 +1462,9 @@ static int nand_do_read_ops(struct mtd_i
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if (realpage != chip->pagebuf || oob) {
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bufpoi = aligned ? buf : chip->buffers->databuf;
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- chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
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+ if (chip->ecc.mode != NAND_ECC_HW_OOB_FIRST) {
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+ chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
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+ }
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/*
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* Now read the page into the buffer. Absent an error,
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