@@ -614,6 +614,9 @@ static void set_command_address(struct pxa3xx_nand_info *info,
static void prepare_start_command(struct pxa3xx_nand_info *info, int command)
{
+ struct pxa3xx_nand_host *host = info->host[info->cs];
+ struct mtd_info *mtd = host->mtd;
+
/* reset data and oob column point to handle data */
info->buf_start = 0;
info->buf_count = 0;
@@ -638,6 +641,19 @@ static void prepare_start_command(struct pxa3xx_nand_info *info, int command)
info->ndcb2 = 0;
break;
}
+
+ /*
+ * If we are about to isse a read command, or about to set
+ * the write address, then clean the data buffer.
+ */
+ if (command == NAND_CMD_READ0 ||
+ command == NAND_CMD_READOOB ||
+ command == NAND_CMD_SEQIN) {
+
+ info->buf_count = mtd->writesize + mtd->oobsize;
+ memset(info->data_buff, 0xFF, info->buf_count);
+ }
+
}
static int prepare_set_command(struct pxa3xx_nand_info *info, int command,
@@ -679,16 +695,11 @@ static int prepare_set_command(struct pxa3xx_nand_info *info, int command,
info->ndcb0 |= NDCB0_DBC | (NAND_CMD_READSTART << 8);
set_command_address(info, mtd->writesize, column, page_addr);
- info->buf_count = mtd->writesize + mtd->oobsize;
- memset(info->data_buff, 0xFF, info->buf_count);
break;
case NAND_CMD_SEQIN:
set_command_address(info, mtd->writesize, column, page_addr);
- info->buf_count = mtd->writesize + mtd->oobsize;
- memset(info->data_buff, 0xFF, info->buf_count);
-
break;
case NAND_CMD_PAGEPROG:
To allow future support of multiple page reading/writing, move the data buffer clean out of prepare_set_command(). This is done to prevent the data buffer from being cleaned on every command preparation, when a multiple command sequence is implemented to read/write pages larger than the FIFO size (2 KiB). Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> --- drivers/mtd/nand/pxa3xx_nand.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-)