| Message ID | 1382137374-21251-12-git-send-email-ezequiel.garcia@free-electrons.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Oct 18, 2013 at 08:02:38PM -0300, Ezequiel Garcia wrote: > READID, STATUS and PARAM (aka ONFI read paramater page) don't read > the OOB area. Set the oob_size to zero and prevent it. The ERASE, RESET also donot need to read the OOB, why not zero the oob_size for these commands? thanks Huang Shiji
On Sun, Nov 03, 2013 at 05:59:05PM -0500, Huang Shijie wrote: > On Fri, Oct 18, 2013 at 08:02:38PM -0300, Ezequiel Garcia wrote: > > READID, STATUS and PARAM (aka ONFI read paramater page) don't read > > the OOB area. Set the oob_size to zero and prevent it. > The ERASE, RESET also donot need to read the OOB, > why not zero the oob_size for these commands? > Because this only matters for commands that will use the oob_size field when doing some I/O operation. Both ERASE and RESET commands have no data cycle, so it makes no sense to haev a non-zero oob_size field. On the other side, this patch is rather stupid, as oob_size is already cleared at the beggining of a command sequence. So, I'll either rework this or drop it entirely. Thanks,
diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c index 83ba036..95e2ce3 100644 --- a/drivers/mtd/nand/pxa3xx_nand.c +++ b/drivers/mtd/nand/pxa3xx_nand.c @@ -302,6 +302,11 @@ static void pxa3xx_nand_set_timing(struct pxa3xx_nand_host *host, nand_writel(info, NDTR1CS0, ndtr1); } +/* + * Set the data and OOB size, depending on the selected + * spare and ECC configuration. + * Only applicable to READ0, READOOB and PAGEPROG commands. + */ static void pxa3xx_set_datasize(struct pxa3xx_nand_info *info) { int oob_enable = info->reg_ndcr & NDCR_SPARE_EN; @@ -661,6 +666,7 @@ static int prepare_command_pool(struct pxa3xx_nand_info *info, int command, info->ndcb1 = (column & 0xFF); info->ndcb3 = 256; info->data_size = 256; + info->oob_size = 0; break; case NAND_CMD_READID: @@ -671,6 +677,7 @@ static int prepare_command_pool(struct pxa3xx_nand_info *info, int command, info->ndcb1 = (column & 0xFF); info->data_size = 8; + info->oob_size = 0; break; case NAND_CMD_STATUS: info->buf_count = 1; @@ -679,6 +686,7 @@ static int prepare_command_pool(struct pxa3xx_nand_info *info, int command, | command; info->data_size = 8; + info->oob_size = 0; break; case NAND_CMD_ERASE1:
READID, STATUS and PARAM (aka ONFI read paramater page) don't read the OOB area. Set the oob_size to zero and prevent it. Also, add a comment clarifying the use of pxa3xx_set_datasize() which is only applicable on data read/write commands. Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> --- drivers/mtd/nand/pxa3xx_nand.c | 8 ++++++++ 1 file changed, 8 insertions(+)