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 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 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/
next reply index Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-07-29 6:41 Greg Ungerer [this message] 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 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 -- 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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