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[MTD] [NAND] pxa3xx: fix non-page-aligned reads 

Reads from non-page-aligned addresses were broken because while the
address to read from was correctly written to NDCB*, a full page was
always read. Fix this by ignoring the column and only using the page
address.

I suspect this whole-page behavior is due to the controller's need to
read the entire page in order to generate correct ECC. In the non-ECC
case this could be optimized to use the column address, and to set the
read length to what is being requested rather than the length of an
entire page.

Signed-off-by: Matt Reimer <mreimer@vpop.net>
Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Matt Reimer 2008-11-18 10:47:42 -08:00 committed by David Woodhouse
parent a5cce42f35
commit 7f9938d0fd
1 changed files with 2 additions and 2 deletions
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4
drivers/mtd/nand/pxa3xx_nand.c
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@ -368,14 +368,14 @@ static int prepare_read_prog_cmd(struct pxa3xx_nand_info *info,
/* large block, 2 cycles for column address
* row address starts from 3rd cycle
*/
info->ndcb1 |= (page_addr << 16) | (column & 0xffff);
info->ndcb1 |= page_addr << 16;
if (info->row_addr_cycles == 3)
info->ndcb2 = (page_addr >> 16) & 0xff;
} else
/* small block, 1 cycles for column address
* row address starts from 2nd cycle
*/
info->ndcb1 = (page_addr << 8) | (column & 0xff);
info->ndcb1 = page_addr << 8;
if (cmd == cmdset->program)
info->ndcb0 |= NDCB0_CMD_TYPE(1) | NDCB0_AUTO_RS;