From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Greg Ungerer <gerg@kernel.org>
Cc: s.hauer@pengutronix.de,
Michael Nazzareno Trimarchi <michael@amarulasolutions.com>,
linux-mtd@lists.infradead.org,
Boris Brezillon <bbrezillon@kernel.org>
Subject: Re: GPMI iMX6ull timeout on DMA
Date: Mon, 29 Jul 2019 14:47:30 +0200 [thread overview]
Message-ID: <20190729144730.4a58de32@xps13> (raw)
In-Reply-To: <18734a1d-17d9-d390-58ef-ad8ca1be925f@kernel.org>
Hi Greg,
+ Boris
Greg Ungerer <gerg@kernel.org> wrote on Mon, 29 Jul 2019 22:33:56 +1000:
> Hi Miquel,
>
> On 29/7/19 6:36 pm, Miquel Raynal wrote:
> > Hi Greg,
> >
> > One question below.
> >
> > +Michael
> > +Sascha
> >
> > Hello Michael, here is a similar issue to yours, I know you did not
> > have enough time to share your solution but here we have someone else
> > reproducing the issue, would you mind sharing a branch or a patch, even
> > a WIP one, just to help debugging?
> >
> > Greg Ungerer <gerg@kernel.org> wrote on Mon, 29 Jul 2019 16:41:51 +1000:
> >
> >> Hi Miquel,
> >>
> >> I am experiencing a problem with NAND flash DMA timeouts on
> >> iMX6ull based boards. The problem is very similar to that
> >> described in:
> >>
> >> https://linux-mtd.infradead.narkive.com/JIUulfFB/gpmi-imx6ull-timeout-on-dma
> >>
> >> That didn't come to any specific resolution that I could see
> >> in that thread.
> >>
> >> The boot trace on the console for me looks like this:
> >>
> >> nand: device found, Manufacturer ID: 0x2c, Chip ID: 0xda
> >> nand: Micron MT29F2G08ABAEAWP
> >> nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
> >> gpmi-nand 1806000.gpmi-nand: DMA timeout, last DMA
> >> gpmi-nand 1806000.gpmi-nand: Show GPMI registers :
> >> gpmi-nand 1806000.gpmi-nand: offset 0x000 : 0x20830002
> >> gpmi-nand 1806000.gpmi-nand: offset 0x010 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x020 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x030 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x040 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x050 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x060 : 0x01c6800c
> >> gpmi-nand 1806000.gpmi-nand: offset 0x070 : 0x00010101
> >> gpmi-nand 1806000.gpmi-nand: offset 0x080 : 0xe0000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x090 : 0x23023336
> >> gpmi-nand 1806000.gpmi-nand: offset 0x0a0 : 0x000001ee
> >> gpmi-nand 1806000.gpmi-nand: offset 0x0b0 : 0xff000001
> >> gpmi-nand 1806000.gpmi-nand: offset 0x0c0 : 0x00000001
> >> gpmi-nand 1806000.gpmi-nand: offset 0x0d0 : 0x05020000
> >> gpmi-nand 1806000.gpmi-nand: Show BCH registers :
> >> gpmi-nand 1806000.gpmi-nand: offset 0x000 : 0x00000100
> >> gpmi-nand 1806000.gpmi-nand: offset 0x010 : 0x00000010
> >> gpmi-nand 1806000.gpmi-nand: offset 0x020 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x030 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x040 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x050 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x060 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x070 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x080 : 0x030a2080
> >> gpmi-nand 1806000.gpmi-nand: offset 0x090 : 0x083e2080
> >> gpmi-nand 1806000.gpmi-nand: offset 0x0a0 : 0x070a4080
> >> gpmi-nand 1806000.gpmi-nand: offset 0x0b0 : 0x10da4080
> >> gpmi-nand 1806000.gpmi-nand: offset 0x0c0 : 0x070a4080
> >> gpmi-nand 1806000.gpmi-nand: offset 0x0d0 : 0x10da4080
> >> gpmi-nand 1806000.gpmi-nand: offset 0x0e0 : 0x070a4080
> >> gpmi-nand 1806000.gpmi-nand: offset 0x0f0 : 0x10da4080
> >> gpmi-nand 1806000.gpmi-nand: offset 0x100 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x110 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x120 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x130 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x140 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x150 : 0x20484342
> >> gpmi-nand 1806000.gpmi-nand: offset 0x160 : 0x01000000
> >> gpmi-nand 1806000.gpmi-nand: offset 0x170 : 0x00000000
> >> gpmi-nand 1806000.gpmi-nand: BCH Geometry :
> >> GF length : 13
> >> ECC Strength : 8
> >> Page Size in Bytes : 2110
> >> Metadata Size in Bytes : 10
> >> ECC Chunk0 Size in Bytes: 512
> >> ECC Chunkn Size in Bytes: 512
> >> ECC Chunk Count : 4
> >> Payload Size in Bytes : 2048
> >> Auxiliary Size in Bytes: 16
> >> Auxiliary Status Offset: 12
> >> Block Mark Byte Offset : 1999
> >> Block Mark Bit Offset : 0
> >> gpmi-nand 1806000.gpmi-nand: Chip: 0, Error -110
> >> nand: timing mode 5 not acknowledged by the NAND chip
> >
> > What is the final timing mode used? Most of us tested in mode 5 I
> > guess, maybe mode 4 is broken (don't know if this is the one used here,
> > neither why mode 5 is refused). Can you please try by limiting the mode
> > to 0, 1, 2... until, hopefully, we narrow down to the failing mode.
>
> Sure, how to do that?
This loop [1] tries to configure each mode (5, 4, ...) until one
succeeds (default is 0: must always work). Please try to limit mode to
0, 1, etc.
Mode 0 should work.
[1] https://elixir.bootlin.com/linux/v5.3-rc1/source/drivers/mtd/nand/raw/nand_base.c#L933
>
>
> >> gpmi-nand 1806000.gpmi-nand: Chip: 0, Error -22
> >> Scanning device for bad blocks
> >> gpmi-nand 1806000.gpmi-nand: Chip: 0, Error -22
> >> gpmi-nand 1806000.gpmi-nand: Chip: 0, Error -22
> >> gpmi-nand 1806000.gpmi-nand: Chip: 0, Error -22
> >> gpmi-nand 1806000.gpmi-nand: Chip: 0, Error -22
> >> ....
> >> gpmi-nand 1806000.gpmi-nand: Chip: 0, Error -22
> >> gpmi-nand 1806000.gpmi-nand: Chip: 0, Error -22
> >> gpmi-nand 1806000.gpmi-nand: Chip: 0, Error -22
> >> 5 fixed-partitions partitions found on MTD device gpmi-nand
> >> Creating 5 MTD partitions on "gpmi-nand":
> >> 0x000000000000-0x000000500000 : "u-boot"
> >> 0x000000500000-0x000000600000 : "u-boot-env"
> >> 0x000000600000-0x000000800000 : "log"
> >> 0x000000800000-0x000010000000 : "flash"
> >> 0x000000000000-0x000010000000 : "all"
> >> gpmi-nand 1806000.gpmi-nand: driver registered.
> >>
> >>
> >> This is using a linux kernel v5.1.14. I have seen this happen on
> >> a number of boards I have here - but it is only occasional. It
> >> only happens once in a while on boot, maybe 1 in 40 or more times.
> >> So it can take quite a while to reproduce (using a boot loop setup).
> >
> > That's strange... I don't get what would produce such unstable issue.
>
> My initial guess is that the calculated timing is very marginal.
What do you mean by "marginal"?
> The problem seems more likely to happen if flash write activity
> had been occurring just before a soft reboot. Its not a guarantee,
> just more likely.
That's really disturbing. I doubt this is the real cause though.
>
> Interesting observation is that Michael was using Micron flash,
> and boards that I have with the problem also have Micron flash.
> Both a form of Micron MT29F2G08.
>
> I have similar boards, iMX6ull based, with different brands of
> NAND flash and I have not seen any problem on them.
That's great to narrow down the root cause. Maybe these chips have
tighter timing constraints.
>
> Regards
> Greg
>
>
>
> >> As per the email thread I pointed to above I looked at reverting
> >> those patches, but that was not at all easy given how much the gpmi
> >> driver code had moved. So instead I modified the code with this:
> >>
> >> --- a/linux/drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c
> >> +++ b/linux/drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c
> >> @@ -481,6 +481,7 @@ static void gpmi_nfc_compute_timings(struct gpmi_nand_data *this,
> >> void gpmi_nfc_apply_timings(struct gpmi_nand_data *this)
> >> {
> >> +#if 0
> >> struct gpmi_nfc_hardware_timing *hw = &this->hw;
> >> struct resources *r = &this->resources;
> >> void __iomem *gpmi_regs = r->gpmi_regs;
> >> @@ -505,6 +512,7 @@ void gpmi_nfc_apply_timings(struct gpmi_nand_data *this)
> >> /* Wait for the DLL to settle. */
> >> udelay(dll_wait_time_us);
> >> +#endif
> >> }
> >> int gpmi_setup_data_interface(struct nand_chip *chip, int chipnr,
> >>
> >> So far after a couple of days of testing with this I no longer
> >> see the DMA timeout.
> >>
> >> Any thoughts?
> >>
> >> Regards
> >> Greg
> >>
> >
> > Thanks,
> > Miquèl
> >
Thanks,
Miquèl
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next prev parent reply other threads:[~2019-07-29 12:48 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-29 6:41 GPMI iMX6ull timeout on DMA Greg Ungerer
2019-07-29 8:36 ` Miquel Raynal
2019-07-29 8:42 ` Michael Nazzareno Trimarchi
2019-07-29 12:18 ` Greg Ungerer
2019-07-29 12:20 ` Michael Nazzareno Trimarchi
2019-07-29 12:33 ` Greg Ungerer
2019-07-29 12:47 ` Miquel Raynal [this message]
2019-07-29 12:49 ` Michael Nazzareno Trimarchi
2019-07-29 12:55 ` Miquel Raynal
2019-07-29 13:00 ` Michael Nazzareno Trimarchi
2019-07-29 13:22 ` Miquel Raynal
2019-07-29 20:00 ` Michael Nazzareno Trimarchi
2019-07-29 21:02 ` Miquel Raynal
2019-07-30 0:28 ` Greg Ungerer
2019-07-30 0:41 ` Greg Ungerer
2019-07-30 6:06 ` Greg Ungerer
2019-07-30 8:38 ` Miquel Raynal
2019-07-30 8:58 ` Boris Brezillon
2019-07-31 2:05 ` Greg Ungerer
2019-07-31 6:28 ` Boris Brezillon
2019-08-02 7:19 ` Greg Ungerer
2019-08-02 12:34 ` Greg Ungerer
2019-08-02 12:51 ` Boris Brezillon
2019-08-05 5:51 ` Greg Ungerer
2019-08-07 16:05 ` Miquel Raynal
2019-08-08 0:43 ` Greg Ungerer
2019-08-08 16:36 ` Boris Brezillon
2019-08-09 5:20 ` Greg Ungerer
2019-08-09 6:23 ` Boris Brezillon
2019-08-09 6:55 ` Greg Ungerer
2019-08-09 7:32 ` Boris Brezillon
2019-08-09 13:57 ` Greg Ungerer
2019-08-09 13:59 ` Boris Brezillon
2019-08-12 2:50 ` Greg Ungerer
2019-08-12 4:04 ` Greg Ungerer
2019-08-12 7:31 ` Boris Brezillon
2019-08-13 0:50 ` Greg Ungerer
2021-01-28 9:45 ` Michael Nazzareno Trimarchi
2021-01-28 10:26 ` Miquel Raynal
2021-01-28 10:35 ` Michael Nazzareno Trimarchi
2021-01-28 11:55 ` Michael Nazzareno Trimarchi
2021-01-29 12:43 ` Greg Ungerer
2021-01-30 9:41 ` Michael Nazzareno Trimarchi
2021-02-01 14:13 ` Miquel Raynal
2021-02-01 14:32 ` Michael Nazzareno Trimarchi
2021-02-01 15:08 ` Michael Nazzareno Trimarchi
2021-02-01 15:14 ` Miquel Raynal
2021-02-01 15:17 ` Michael Nazzareno Trimarchi
2021-10-15 20:05 ` Michael Trimarchi
2021-10-15 20:12 ` Michael Nazzareno Trimarchi
2021-10-18 7:19 ` Miquel Raynal
2021-10-18 7:33 ` Michael Nazzareno Trimarchi
2021-10-18 7:43 ` Miquel Raynal
2021-10-04 5:54 ` Christian Eggers
2021-10-04 6:27 ` Michael Nazzareno Trimarchi
2021-10-04 15:33 ` Miquel Raynal
2021-10-04 16:06 ` Han Xu
2021-10-05 6:02 ` Christian Eggers
2021-10-08 9:55 ` Christian Eggers
2021-10-08 12:08 ` Stefan Riedmüller
2021-10-08 12:27 ` Miquel Raynal
2021-10-08 13:11 ` Christian Eggers
2021-10-08 13:29 ` Miquel Raynal
2021-10-08 13:36 ` Miquel Raynal
2021-10-08 13:49 ` Christian Eggers
2021-10-08 16:07 ` Miquel Raynal
2021-10-09 5:53 ` Michael Nazzareno Trimarchi
2021-10-11 6:46 ` Miquel Raynal
2021-10-12 9:02 ` [RFC PATCH 1/2] mtd: rawnand: gpmi: Remove explicit default gpmi clock setting for i.MX6 Stefan Riedmueller
2021-10-12 9:02 ` [RFC PATCH 2/2] gpmi-nand: Add ERR007117 protection for nfc_apply_timings Stefan Riedmueller
2021-10-13 5:01 ` Han Xu
2021-10-22 8:45 ` Stefan Riedmüller
2021-10-22 14:35 ` han.xu
2021-10-25 9:39 ` Stefan Riedmüller
2021-10-28 9:28 ` Stefan Riedmüller
2021-11-01 4:01 ` han.xu
2021-10-13 6:10 ` Christian Eggers
2021-10-13 6:00 ` [RFC PATCH 1/2] mtd: rawnand: gpmi: Remove explicit default gpmi clock setting for i.MX6 Christian Eggers
2021-10-09 6:26 ` GPMI iMX6ull timeout on DMA Christian Eggers
2021-10-13 6:15 ` Christian Eggers
2021-10-08 13:13 ` Christian Eggers
2021-10-08 13:30 ` Miquel Raynal
2021-10-09 6:33 ` Christian Eggers
-- strict thread matches above, loose matches on Subject: below --
2018-10-02 13:22 GPMI IMX6ull timeout on dma Michael Nazzareno Trimarchi
2018-10-04 14:36 ` Michael Nazzareno Trimarchi
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