[PATCH 4/4] mtd: rawnand: gpmi: support fast edo timings for mx28

[Miquel Raynal]

On Tue, 2022-01-18 at 09:54:34 UTC, Dario Binacchi wrote:
> In the i.MX28 manual (MCIMX28RM, Rev. 1, 2010) you can find an example
> (15.2.4 High-Speed NAND Timing) of how to configure the GPMI controller
> to manage High-Speed ​​NAND devices, so it was wrong to assume that only
> i.MX6 can achieve EDO timings.
> 
> This patch has been tested on a 2048/64 byte NAND (Micron MT29F2G08ABAEAH4).
> Kernel mtd tests:
>  - mtd_nandbiterrs
>  - mtd_nandecctest
>  - mtd_oobtest
>  - mtd_pagetest
>  - mtd_readtest
>  - mtd_speedtest
>  - mtd_stresstest
>  - mtd_subpagetest
>  - mtd_torturetest [cycles_count = 10000000]
> run without errors.
> 
> Before this patch (mode 0):
> ---------------------------
> eraseblock write speed is 2098 KiB/s
> eraseblock read speed is 2680 KiB/s
> page write speed is 1689 KiB/s
> page read speed is 2522 KiB/s
> 2 page write speed is 1899 KiB/s
> 2 page read speed is 2579 KiB/s
> erase speed is 128000 KiB/s
> 2x multi-block erase speed is 73142 KiB/s
> 4x multi-block erase speed is 204800 KiB/s
> 8x multi-block erase speed is 256000 KiB/s
> 16x multi-block erase speed is 256000 KiB/s
> 32x multi-block erase speed is 256000 KiB/s
> 64x multi-block erase speed is 256000 KiB/s
> 
> After this patch (mode 5):
> -------------------------
> eraseblock write speed is 3390 KiB/s
> eraseblock read speed is 5688 KiB/s
> page write speed is 2680 KiB/s
> page read speed is 4876 KiB/s
> 2 page write speed is 2909 KiB/s
> 2 page read speed is 5224 KiB/s
> erase speed is 170666 KiB/s
> 2x multi-block erase speed is 204800 KiB/s
> 4x multi-block erase speed is 256000 KiB/s
> 8x multi-block erase speed is 256000 KiB/s
> 16x multi-block erase speed is 256000 KiB/s
> 32x multi-block erase speed is 256000 KiB/s
> 64x multi-block erase speed is 256000 KiB/s
> 
> Co-developed-by: Michael Trimarchi <michael at amarulasolutions.com>
> Signed-off-by: Michael Trimarchi <michael at amarulasolutions.com>
> Signed-off-by: Dario Binacchi <dario.binacchi at amarulasolutions.com>
> Tested-by: Sascha Hauer <s.hauer at pengutronix.de>
> Reviewed-by: Sascha Hauer <s.hauer at pengutronix.de>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel