[0/5] MTK NAND driver improvements and fixes

Message

xiaolei li April 29, 2019, 6:38 a.m. UTC

Hello Maintainers,

The following patch set is used to do MTK NAND driver improvements and
bug fixes, include:
* Fix low level time calculation of read/write cycle to meet tRC_min
  and tWC_min requirements.
* Refine RE# pulse width calculation and data sampling to improve read
  performance.
* Add CS validity check.
* Fix oob buffer pointer wrongly setting and empty page threshold setting.

Changes relative to:
--------------------

tree    : git://git.infradead.org/linux-mtd.git
branch  : master
commit  :
        'commit 3e35730dd754 ("mtd: powernv_flash: Fix device
         registration error")

Tests:
------

* ubifs and jffs2 are validated on NAND device MT29F16G08ADBCA by
  'dd' command.
* all drivers/mtd/tests/* pass.
* speed test:
  eraseblock write speed is 11087 KiB/s
  eraseblock read speed is 19986 KiB/s
  page write speed is 10689 KiB/s
  page read speed is 18724 KiB/s
  2 page write speed is 10611 KiB/s
  2 page read speed is 18713 KiB/s
  erase speed is 103696 KiB/s
  2x multi-block erase speed is 354248 KiB/s
  4x multi-block erase speed is 350459 KiB/s
  8x multi-block erase speed is 356173 KiB/s
  16x multi-block erase speed is 356173 KiB/s
  32x multi-block erase speed is 358120 KiB/s
  64x multi-block erase speed is 356173 KiB/s

Xiaolei Li (5):
  mtd: rawnand: mtk: Correct low level time calculation of r/w cycle
  mtd: rawnand: mtk: Improve data sampling timing for read cycle
  mtd: rawnand: mtk: Add validity check for CE# pin setting
  mtd: rawnand: mtk: Fix wrongly assigned oob buffer pointer issue
  mtd: rawnand: mtk: Setup empty page threshold correctly

 drivers/mtd/nand/raw/mtk_nand.c | 73 ++++++++++++++++++++++++++-------
 1 file changed, 59 insertions(+), 14 deletions(-)

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2.18.0