[PATCH v2] Improve MTK ECC Engine driver

[Xiaolei Li <xiaolei.li@mediatek.com>]

This patch-set is mainly to improve MTK ECC Engine driver, include
- remove dummy ECC IRQ disable setting
- fix infinite ECC decode IRQ issue

Changes on v2 relative to:
--------------------

tree    : https://github.com/bbrezillon/linux-0day
branch  : nand/next
commit  :
        'commit 1f3df4dc088d927683b292118cd8b4eaaf1af573
        Author: Sascha Hauer <s.hauer@pengutronix.de>
        Date:   Mon Oct 16 11:51:55 2017 +0200'

Patch v2:
---------
- keep writel(0, ecc->regs + ECC_IRQ_REG(op)) in mtk_ecc_disable(), and
  remove writel(0, ecc->regs + ECC_IRQ_REG(op)) from irq handler. It's
  usually the caller who decides when the IRQ should be enabled/disable.
- add readw(ecc->regs + ECC_DECIRQ_STA) in mtk_ecc_disable() in case there
  is a timeout to wait decode IRQ.

Tests:
------

* ubifs and jffs2 are validated on NAND device MT29F16G08ADBCA
  by 'dd' command.
* all drivers/mtd/tests/* pass.

Xiaolei Li (1):
  mtd: nand: mtk: fix infinite ECC decode IRQ issue

 drivers/mtd/nand/mtk_ecc.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

-- 
1.9.1