Re: [PATCH 1/2] dt-bindings: mtd: nand: Macronix: document new binding

[Álvaro Fernández Rojas]

Hi Jaime,

I've reproduced the issue on a Comtrend VR-3032u (MX30LF1G08AA). After
forcing it to check block protection (it's not supported on that
device), the NAND controller stops reading/writing anything.

@Florian is it possible that low level ops (GET_FEATURES/SET_FEATURES)
aren't supported on BCM63268 NAND controllers and this is causing the
issue?

Best regards,
Álvaro.

El mié, 26 abr 2023 a las 9:24, liao jaime (<jaimeliao.tw@xxxxxxxxx>) escribió:
>
> Hi Álvaro
>
> In nand_scan_tail(), each manufacturer init function call will be execute.
> In macronix_nand_init(), block protect will be execute after flash detect.
> I have validate MX30LF1G18AC in Linux kernel v5.15.
> I didn't got situation "device hangs"  on my side.
> BP is to prevent incorrect operations.
> Please check the controller settings for tracing this issue.
>
> Thanks
> Jaime
>
> >
> > Hello YouChing and Jaime,
> >
> > I still didn't get any feedback from you (or Macronix) on this issue.
> > Did you have time to look into it?
> >
> > Thanks,
> > Álvaro.
> >
> > El vie, 24 mar 2023 a las 18:04, Álvaro Fernández Rojas
> > (<noltari@xxxxxxxxx>) escribió:
> > >
> > > Hi Miquèl,
> > >
> > > 2023-03-24 15:36 GMT+01:00, Miquel Raynal <miquel.raynal@xxxxxxxxxxx>:
> > > > Hi Álvaro,
> > > >
> > > > + YouChing and Jaime from Macronix
> > > > TLDR for them: there is a misbehavior since Mason added block
> > > > protection support. Just checking if the blocks are protected seems to
> > > > misconfigure the chip entirely, see below. Any hints?
> > >
> > > Could it be that the NAND is stuck expecting a read 0x00 command which
> > > isn’t sent after getting the features?
> > >
> > > >
> > > > noltari@xxxxxxxxx wrote on Fri, 24 Mar 2023 15:15:47 +0100:
> > > >
> > > >> Hi Miquèl,
> > > >>
> > > >> 2023-03-24 14:45 GMT+01:00, Miquel Raynal <miquel.raynal@xxxxxxxxxxx>:
> > > >> > Hi Álvaro,
> > > >> >
> > > >> > noltari@xxxxxxxxx wrote on Fri, 24 Mar 2023 12:21:11 +0100:
> > > >> >
> > > >> >> El vie, 24 mar 2023 a las 11:49, Miquel Raynal
> > > >> >> (<miquel.raynal@xxxxxxxxxxx>) escribió:
> > > >> >> >
> > > >> >> > Hi Álvaro,
> > > >> >> >
> > > >> >> > noltari@xxxxxxxxx wrote on Fri, 24 Mar 2023 11:31:17 +0100:
> > > >> >> >
> > > >> >> > > Hi Miquèl,
> > > >> >> > >
> > > >> >> > > El vie, 24 mar 2023 a las 10:40, Miquel Raynal
> > > >> >> > > (<miquel.raynal@xxxxxxxxxxx>) escribió:
> > > >> >> > > >
> > > >> >> > > > Hi Álvaro,
> > > >> >> > > >
> > > >> >> > > > noltari@xxxxxxxxx wrote on Thu, 23 Mar 2023 13:45:09 +0100:
> > > >> >> > > >
> > > >> >> > > > > Add new "mxic,disable-block-protection" binding documentation.
> > > >> >> > > > > This binding allows disabling block protection support for
> > > >> >> > > > > those
> > > >> >> > > > > devices not
> > > >> >> > > > > supporting it.
> > > >> >> > > > >
> > > >> >> > > > > Signed-off-by: Álvaro Fernández Rojas <noltari@xxxxxxxxx>
> > > >> >> > > > > ---
> > > >> >> > > > >  Documentation/devicetree/bindings/mtd/nand-macronix.txt | 3
> > > >> >> > > > > +++
> > > >> >> > > > >  1 file changed, 3 insertions(+)
> > > >> >> > > > >
> > > >> >> > > > > diff --git
> > > >> >> > > > > a/Documentation/devicetree/bindings/mtd/nand-macronix.txt
> > > >> >> > > > > b/Documentation/devicetree/bindings/mtd/nand-macronix.txt
> > > >> >> > > > > index ffab28a2c4d1..03f65ca32cd3 100644
> > > >> >> > > > > --- a/Documentation/devicetree/bindings/mtd/nand-macronix.txt
> > > >> >> > > > > +++ b/Documentation/devicetree/bindings/mtd/nand-macronix.txt
> > > >> >> > > > > @@ -16,6 +16,9 @@ in children nodes.
> > > >> >> > > > >  Required NAND chip properties in children mode:
> > > >> >> > > > >  - randomizer enable: should be "mxic,enable-randomizer-otp"
> > > >> >> > > > >
> > > >> >> > > > > +Optional NAND chip properties in children mode:
> > > >> >> > > > > +- block protection disable: should be
> > > >> >> > > > > "mxic,disable-block-protection"
> > > >> >> > > > > +
> > > >> >> > > >
> > > >> >> > > > Besides the fact that nowadays we prefer to see binding
> > > >> >> > > > conversions
> > > >> >> > > > to
> > > >> >> > > > yaml before adding anything, I don't think this will fly.
> > > >> >> > > >
> > > >> >> > > > I'm not sure exactly what "disable block protection" means, we
> > > >> >> > > > already have similar properties like "lock" and
> > > >> >> > > > "secure-regions",
> > > >> >> > > > not
> > > >> >> > > > sure they will fit but I think it's worth checking.
> > > >> >> > >
> > > >> >> > > As explained in 2/2, commit 03a539c7a118 introduced a regression
> > > >> >> > > on
> > > >> >> > > Sercomm H500-s (BCM63268) OpenWrt devices with Macronix
> > > >> >> > > MX30LF1G18AC
> > > >> >> > > which hangs the device.
> > > >> >> > >
> > > >> >> > > This is the log with block protection disabled:
> > > >> >> > > [    0.495831] bcm6368_nand 10000200.nand: there is not valid maps
> > > >> >> > > for
> > > >> >> > > state default
> > > >> >> > > [    0.504995] nand: device found, Manufacturer ID: 0xc2, Chip ID:
> > > >> >> > > 0xf1
> > > >> >> > > [    0.511526] nand: Macronix MX30LF1G18AC
> > > >> >> > > [    0.515586] nand: 128 MiB, SLC, erase size: 128 KiB, page size:
> > > >> >> > > 2048, OOB size: 64
> > > >> >> > > [    0.523516] bcm6368_nand 10000200.nand: detected 128MiB total,
> > > >> >> > > 128KiB blocks, 2KiB pages, 16B OOB, 8-bit, BCH-4
> > > >> >> > > [    0.535912] Bad block table found at page 65472, version 0x01
> > > >> >> > > [    0.544268] Bad block table found at page 65408, version 0x01
> > > >> >> > > [    0.954329] 9 fixed-partitions partitions found on MTD device
> > > >> >> > > brcmnand.0
> > > >> >> > > ...
> > > >> >> > >
> > > >> >> > > This is the log with block protection enabled:
> > > >> >> > > [    0.495095] bcm6368_nand 10000200.nand: there is not valid maps
> > > >> >> > > for
> > > >> >> > > state default
> > > >> >> > > [    0.504249] nand: device found, Manufacturer ID: 0xc2, Chip ID:
> > > >> >> > > 0xf1
> > > >> >> > > [    0.510772] nand: Macronix MX30LF1G18AC
> > > >> >> > > [    0.514874] nand: 128 MiB, SLC, erase size: 128 KiB, page size:
> > > >> >> > > 2048, OOB size: 64
> > > >> >> > > [    0.522780] bcm6368_nand 10000200.nand: detected 128MiB total,
> > > >> >> > > 128KiB blocks, 2KiB pages, 16B OOB, 8-bit, BCH-4
> > > >> >> > > [    0.539687] Bad block table not found for chip 0
> > > >> >> > > [    0.550153] Bad block table not found for chip 0
> > > >> >> > > [    0.555069] Scanning device for bad blocks
> > > >> >> > > [    0.601213] CPU 1 Unable to handle kernel paging request at
> > > >> >> > > virtual
> > > >> >> > > address 10277f00, epc == 8039ce70, ra == 8016ad50
> > > >> >> > > *** Device hangs ***
> > > >> >> > >
> > > >> >> > > Enabling macronix_nand_block_protection_support() makes the device
> > > >> >> > > unable to detect the bad block table and hangs it when trying to
> > > >> >> > > scan
> > > >> >> > > for bad blocks.
> > > >> >> >
> > > >> >> > Please trace nand_macronix.c and look:
> > > >> >> > - are the get_features and set_features really supported by the
> > > >> >> >   controller driver?
> > > >> >>
> > > >> >> This is what I could find by debugging:
> > > >> >> [    0.494993] bcm6368_nand 10000200.nand: there is not valid maps for
> > > >> >> state default
> > > >> >> [    0.505375] nand: device found, Manufacturer ID: 0xc2, Chip ID:
> > > >> >> 0xf1
> > > >> >> [    0.512077] nand: Macronix MX30LF1G18AC
> > > >> >> [    0.515994] nand: 128 MiB, SLC, erase size: 128 KiB, page size:
> > > >> >> 2048, OOB size: 64
> > > >> >> [    0.523928] bcm6368_nand 10000200.nand: detected 128MiB total,
> > > >> >> 128KiB blocks, 2KiB pages, 16B OOB, 8-bit, BCH-4
> > > >> >> [    0.534415] bcm6368_nand 10000200.nand: ll_op cmd 0xa00ee
> > > >> >> [    0.539988] bcm6368_nand 10000200.nand: ll_op cmd 0x600a0
> > > >> >> [    0.545659] bcm6368_nand 10000200.nand: ll_op cmd 0x10000
> > > >> >> [    0.551214] bcm6368_nand 10000200.nand: NAND_CMD_GET_FEATURES =
> > > >> >> 0x00
> > > >> >> [    0.557843] bcm6368_nand 10000200.nand: ll_op cmd 0x10000
> > > >> >> [    0.563475] bcm6368_nand 10000200.nand: NAND_CMD_GET_FEATURES =
> > > >> >> 0x00
> > > >> >> [    0.569998] bcm6368_nand 10000200.nand: ll_op cmd 0x10000
> > > >> >> [    0.575653] bcm6368_nand 10000200.nand: NAND_CMD_GET_FEATURES =
> > > >> >> 0x00
> > > >> >> [    0.582246] bcm6368_nand 10000200.nand: ll_op cmd 0x80010000
> > > >> >> [    0.588067] bcm6368_nand 10000200.nand: NAND_CMD_GET_FEATURES =
> > > >> >> 0x00
> > > >> >> [    0.594657] nand: nand_get_features: addr=a0 subfeature_param=[00
> > > >> >> 00 00 00] -> 0
> > > >> >> [    0.602341] macronix_nand_block_protection_support:
> > > >> >> ONFI_FEATURE_ADDR_MXIC_PROTECTION=0
> > > >> >> [    0.610548] macronix_nand_block_protection_support: !=
> > > >> >> MXIC_BLOCK_PROTECTION_ALL_LOCK
> > > >> >> [    0.624760] Bad block table not found for chip 0
> > > >> >> [    0.635542] Bad block table not found for chip 0
> > > >> >> [    0.640270] Scanning device for bad blocks
> > > >> >>
> > > >> >> I don't know how to tell if get_features / set_features is really
> > > >> >> supported...
> > > >> >
> > > >> > Looks like your driver does not support exec_op but the core provides a
> > > >> > get/set_feature implementation.
> > > >>
> > > >> According to Florian, low level should be supported on brcmnand
> > > >> controllers >= 4.0
> > > >> Also:
> > > >> https://github.com/nomis/bcm963xx_4.12L.06B_consumer/blob/e2f23ddbb20bf75689372b6e6a5a0dc613f6e313/shared/opensource/include/bcm963xx/63268_map_part.h#L1597
> > > >
> > > > Just to be sure, you're using a mainline controller driver, not this
> > > > one?
> > >
> > > Yes, this was just to prove that the HW I’m using has get/set features support.
> > > I’m using OpenWrt, so it’s linux v5.15 driver.
> > >
> > > >
> > > >> >
> > > >> >>
> > > >> >> > - what is the state of the locking configuration in the chip when
> > > >> >> > you
> > > >> >> >   boot?
> > > >> >>
> > > >> >> Unlocked, I guess...
> > > >> >> How can I check that?
> > > >> >
> > > >> > It's in your dump, the chip returns 0, meaning it's all unlocked,
> > > >> > apparently.
> > > >>
> > > >> Well, I can read/write the device if block protection isn’t disabled,
> > > >> so I guess we can confirm it’s unlocked…
> > > >>
> > > >> >
> > > >> >> > - is there anything that locks the device by calling mxic_nand_lock()
> > > >> >> > ?
> > > >> >
> > > >> > So nobody locks the device I guess? Did you add traces there?
> > > >>
> > > >> It doesn’t get to the point that it enabled the lock/unlock functions
> > > >> since it fails when checking if feature is 0x38, so there’s no point
> > > >> in adding those traces…
> > > >
> > > > Right, it returns before setting these I guess.
> > > >
> > > >>
> > > >> >
> > > >> >> > - finding no bbt is one thing, hanging is another, where is it
> > > >> >> > hanging
> > > >> >> >   exactly? (offset in nand/ and line in the code)
> > > >> >>
> > > >> >> I've got no idea...
> > > >> >
> > > >> > You can use ftrace or just add printks a bit everywhere and try to get
> > > >> > closer and closer.
> > > >>
> > > >> I think that after trying to get the feature it just start reading
> > > >> nonsense from the NAND and at some point it hangs due to that garbage…
> > > >
> > > > It should refuse to mount the device somehow, but in no case the kernel
> > > > should hang.
> > >
> > > Yes, I think that this is a side effect (maybe a different bug somewhere else).
> > >
> > > >
> > > >> Is it posible that the NAND starts behaving like this after getting
> > > >> the feature due to some specific config of my device?
> > > >>
> > > >> >
> > > >> > I looked at the patch, I don't see anything strange. Besides, I have a
> > > >> > close enough datasheet and I don't see what could confuse the device.
> > > >> >
> > > >> > Are you really sure this patch is the problem? Is the WP pin wired on
> > > >> > your design?
> > > >>
> > > >> There’s no WP pin in brcmnand controllers < 7.0
> > > >
> > > > What about the chip?
> > >
> > > Maybe it has a GPIO controlling that, but I don’t have that info…
> > >
> > > >
> > > > Thanks,
> > > > Miquèl
> > > >