mtd: nand: mtk: disable ecc irq when writing page with hwecc
authorXiaolei Li <xiaolei.li@mediatek.com>
Fri, 23 Jun 2017 07:12:25 +0000 (15:12 +0800)
committerBoris Brezillon <boris.brezillon@free-electrons.com>
Sun, 25 Jun 2017 14:54:01 +0000 (16:54 +0200)
commit88404312556c10e4bcd1aeeb75b1b7e9e3226160
treea5651ff28ea231e694d0e651212bdbe08853914d
parent188986c70e09f0f3cd88e6fe14c89e439474e3ec
mtd: nand: mtk: disable ecc irq when writing page with hwecc

Currently, ecc encode irq is enabled when writing page with hwecc, but
we actually do not wait for this irq done. Because NFI and ECC work in
parallel, nfi irq and ecc irq almost come together.

Now, there are two steps to check whether page data are totally written.
First, wait for nfi irq INTR_AHB_DONE. This is to ensure all data
in RAM are received by NFI.
Second, polling the register NFI_ADDRCNTR till all data include ecc
parity data runtime generated by ECC are sent to NAND device.

So, it is redunant to enable ecc irq without waiting for it.

Signed-off-by: Xiaolei Li <xiaolei.li@mediatek.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
drivers/mtd/nand/mtk_ecc.c