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Date: Mon, 17 Jan 2022 12:18:29 +0100
From: Dario Binacchi <dario.binacchi@...rulasolutions.com>
To: linux-kernel@...r.kernel.org
Cc: Michael Trimarchi <michael@...rulasolutions.com>,
Dario Binacchi <dario.binacchi@...rulasolutions.com>,
Han Xu <han.xu@....com>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Richard Weinberger <richard@....at>,
Vignesh Raghavendra <vigneshr@...com>,
linux-mtd@...ts.infradead.org
Subject: [RFC PATCH v2 5/5] mtd: rawnand: gpmi: support fast edo timings for mx28
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@...rulasolutions.com>
Signed-off-by: Michael Trimarchi <michael@...rulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
---
Changes in v2:
- Improve the commit message.
- Move the patch to the end of the series.
drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
index 7ae7a37775a3..7b9191a70ed1 100644
--- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
@@ -806,8 +806,8 @@ static int gpmi_setup_interface(struct nand_chip *chip, int chipnr,
if (IS_ERR(sdr))
return PTR_ERR(sdr);
- /* Only MX6 GPMI controller can reach EDO timings */
- if (sdr->tRC_min <= 25000 && !GPMI_IS_MX6(this))
+ /* Only MX28/MX6 GPMI controller can reach EDO timings */
+ if (sdr->tRC_min <= 25000 && !GPMI_IS_MX28(this) && !GPMI_IS_MX6(this))
return -ENOTSUPP;
/* Stop here if this call was just a check */
--
2.32.0
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