@@ -345,24 +345,26 @@ static void vf610_nfc_command(struct mtd_info *mtd, unsigned command,
nfc->alt_buf = 0;
switch (command) {
+ case NAND_CMD_SEQIN:
+ /* Use valid column/page from preread... */
+ vf610_nfc_addr_cycle(mtd, column, page);
+ /*
+ * SEQIN => data => PAGEPROG sequence is done by the controller
+ * hence we do not need to issue the command here...
+ */
+ return;
case NAND_CMD_PAGEPROG:
vf610_nfc_transfer_size(nfc->regs, nfc->page_sz);
vf610_nfc_send_commands(nfc->regs, NAND_CMD_SEQIN,
command, PROGRAM_PAGE_CMD_CODE);
- vf610_nfc_addr_cycle(mtd, column, page);
break;
case NAND_CMD_RESET:
vf610_nfc_transfer_size(nfc->regs, 0);
vf610_nfc_send_command(nfc->regs, command, RESET_CMD_CODE);
break;
- /*
- * NFC does not support sub-page reads and writes,
- * so emulate them using full page transfers.
- */
case NAND_CMD_READOOB:
nfc->spareonly = 1;
- case NAND_CMD_SEQIN: /* Pre-read for partial writes. */
case NAND_CMD_READ0:
column = 0;
vf610_nfc_transfer_size(nfc->regs, nfc->page_sz);
Since we do not support sub-page writes anyway, reading the page back to the controller on SEQIN command is not required. Remove the page read on SEQIN. However, the column/page values relevant to the SEQIN command, hence set the column/row address on SEQIN command. Signed-off-by: Stefan Agner <stefan@agner.ch> --- This improved the write performance quite nicely. The nand write command improves from 2.9MiB/s to 3.5MiB/s. A ubi write of a UBIFS image which is around 100MiB improves from 34.5s to 27.1s. Measured on a Colibri VF61 (512MiB Macronix NAND). drivers/mtd/nand/vf610_nfc.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-)