Re: [PATCH] mtd: rawnand: mxc: Move the ECC engine initialization to the right place

[Sascha Hauer <s.hauer@pengutronix.de>]

Hi Miquel,

On Fri, Oct 16, 2020 at 09:49:42AM +0200, Miquel Raynal wrote:
> No ECC initialization should happen during the host controller probe.
> 
> Indeed, we need the probe to call nand_scan() in order to:
> - identify the device, its capabilities and constraints (nand_scan_ident())
> - configure the ECC engine accordingly (->attach_chip())
> - scan its content and prepare the core (nand_scan_tail())
> 
> Moving these lines to mxcnd_attach_chip() fixes a regression caused by
> a previous commit supposed to clarify these steps.
> 
> Fixes: TODO
> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
> ---
> 
> Hi Han,
> 
> Could you please give this patch a shot? It is supposed to fix
> the LS1043A issue we have seen in robots reports the last weeks.

With this there's no longer a division by zero in the kernel, but NAND
now fails with the following. Also I can confirm that "mtd: rawnand:
Use the ECC framework user input parsing bits" in next breaks it, without
this patch the driver runs well.

Sascha

nand: device found, Manufacturer ID: 0x20, Chip ID: 0xa1
nand: ST Micro NAND01GR3B2CZA6
nand: 128 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 at drivers/mtd/nand/raw/mxc_nand.c:1390 mxc_nand_command+0xc4/0x26c
Unimplemented command (cmd=0)
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 5.9.0-rc2-00020-g2e00450a5852 #20
Hardware name: Freescale i.MX27 (Device Tree Support)
[<c00106a4>] (unwind_backtrace) from [<c000dd08>] (show_stack+0x10/0x18)
[<c000dd08>] (show_stack) from [<c037950c>] (dump_stack+0x20/0x2c)
[<c037950c>] (dump_stack) from [<c001c68c>] (__warn+0xb8/0xec)
[<c001c68c>] (__warn) from [<c001ca54>] (warn_slowpath_fmt+0x90/0xbc)
[<c001ca54>] (warn_slowpath_fmt) from [<c0494cb8>] (mxc_nand_command+0xc4/0x26c)
[<c0494cb8>] (mxc_nand_command) from [<c0489f50>] (nand_read_page_op+0x28c/0x300)
[<c0489f50>] (nand_read_page_op) from [<c048a0d4>] (nand_read_page_raw+0x2c/0x6c)
[<c048a0d4>] (nand_read_page_raw) from [<c0486b68>] (nand_read_page_swecc+0x38/0x11c)
[<c0486b68>] (nand_read_page_swecc) from [<c0487f5c>] (nand_read_oob+0x238/0x730)
[<c0487f5c>] (nand_read_oob) from [<c047650c>] (mtd_read_oob+0x84/0x14c)
[<c047650c>] (mtd_read_oob) from [<c048eb7c>] (scan_read+0xd0/0x138)
[<c048eb7c>] (scan_read) from [<c048fe18>] (search_bbt+0x254/0x2cc)
[<c048fe18>] (search_bbt) from [<c0490068>] (nand_create_bbt+0x1d8/0x6ec)
[<c0490068>] (nand_create_bbt) from [<c048d20c>] (nand_scan_with_ids+0x10fc/0x164c)
[<c048d20c>] (nand_scan_with_ids) from [<c0495dd8>] (mxcnd_probe+0x2bc/0x3b4)
[<c0495dd8>] (mxcnd_probe) from [<c041c2b4>] (platform_drv_probe+0x4c/0xa0)
[<c041c2b4>] (platform_drv_probe) from [<c0419e18>] (really_probe+0x1e8/0x3d0)
[<c0419e18>] (really_probe) from [<c041a170>] (driver_probe_device+0x54/0xb0)
[<c041a170>] (driver_probe_device) from [<c041a384>] (device_driver_attach+0x5c/0x64)
[<c041a384>] (device_driver_attach) from [<c041a3e8>] (__driver_attach+0x5c/0xcc)
[<c041a3e8>] (__driver_attach) from [<c0417f30>] (bus_for_each_dev+0x78/0xc4)
[<c0417f30>] (bus_for_each_dev) from [<c0419734>] (driver_attach+0x18/0x24)
[<c0419734>] (driver_attach) from [<c04191b4>] (bus_add_driver+0x178/0x1d8)
[<c04191b4>] (bus_add_driver) from [<c041af74>] (driver_register+0x74/0x114)
[<c041af74>] (driver_register) from [<c041c20c>] (__platform_driver_register+0x30/0x48)
[<c041c20c>] (__platform_driver_register) from [<c090ecb8>] (mxcnd_driver_init+0x10/0x1c)
[<c090ecb8>] (mxcnd_driver_init) from [<c000a1dc>] (do_one_initcall+0x50/0x278)
[<c000a1dc>] (do_one_initcall) from [<c08ebffc>] (kernel_init_freeable+0x13c/0x1c0)
[<c08ebffc>] (kernel_init_freeable) from [<c070e150>] (kernel_init+0x8/0xf8)
[<c070e150>] (kernel_init) from [<c0008560>] (ret_from_fork+0x14/0x34)
Exception stack(0xc783dfb0 to 0xc783dff8)
dfa0:                                     00000000 00000000 00000000 00000000
dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
---[ end trace 0f9701f8ecf348de ]---
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
Bad block table not found for chip 0
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error
__nand_correct_data: uncorrectable ECC error

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