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From: Greg Ungerer <gerg@kernel.org>
To: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: linux-mtd@lists.infradead.org
Subject: GPMI iMX6ull timeout on DMA
Date: Mon, 29 Jul 2019 16:41:51 +1000	[thread overview]
Message-ID: <89ae32a0-9b19-4735-90eb-4ffa22aad704@kernel.org> (raw)

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
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).

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


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             reply	other threads:[~2019-07-29  6:42 UTC|newest]

Thread overview: 85+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-29  6:41 Greg Ungerer [this message]
2019-07-29  8:36 ` GPMI iMX6ull timeout on DMA 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
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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