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Date:   Fri,  1 Mar 2019 19:29:20 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     liang.yang@...ogic.com
Cc:     linux-mtd@...ts.infradead.org, linux-amlogic@...ts.infradead.org,
        devicetree@...r.kernel.org, robh+dt@...nel.org,
        mark.rutland@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, jianxin.pan@...ogic.com,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [RFC PATCH nand-next 0/2] meson-nand: support for older SoCs

Hi Liang,

I am trying to add support for older SoCs to the meson-nand driver.
Back when the driver was in development I used an early revision (of
your driver) and did some modifications to make it work on older SoCs.

Now that the driver is upstream I wanted to give it another try and
make a real patch out of it. Unfortunately it's not working anymore.

As far as I know the NFC IP block revision on GXL is similar (or even
the same?) as on all older SoCs. As far as I can tell only the clock
setup is different on the older SoCs (which have a dedicated NAND
clock):
- we don't need the "amlogic,mmc-syscon" property on the older SoCs
  because we don't need to setup any muxing (common clock framework
  will do everything for us)
- "rx" and "tx" clocks don't exist
- I could not find any other differences between Meson8, Meson8b,
  Meson8m2, GXBB and GXL

In this series I'm sending two patches which add support for the older
SoCs.

Unfortunately these patches are currently not working for me (hence the
"RFC" prefix). I get a (strange) crash which is triggered by the
kzalloc() in meson_nfc_read_buf() - see below for more details.

Can you please help me on this one? I'd like to know whether:
- the meson-nand driver works for you on GXL or AXG on linux-next?
  (I was running these patches on top of next-20190301 on my M8S
  board which uses a 32-bit Meson8m2 SoC. I don't have any board using
  a GXL SoC which also has NAND)
- you see any issue with my patches? (maybe I missed more differences
  between GXL and the older SoCs)


kernel log extract:
[...]
Could not find a valid ONFI parameter page, trying bit-wise majority to recover it
ONFI parameter recovery failed, aborting
Unable to handle kernel paging request at virtual address 80110000
pgd = (ptrval)
[80110000] *pgd=00000000
Internal error: Oops: 5 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 2 PID: 1 Comm: swapper/0 Not tainted 5.0.0-rc8-next-20190301-00053-g50ac6f7757e2 #4145
Hardware name: Amlogic Meson platform
PC is at kmem_cache_alloc_trace+0xc8/0x268
LR is at kmem_cache_alloc_trace+0x2c/0x268
pc : [<c046479c>]    lr : [<c0464700>]    psr: 60000013
sp : c02adc58  ip : e9e7a440  fp : 00004ee2
r10: 80110000  r9 : ffffe000  r8 : c110918c
r7 : 00000008  r6 : c08967c0  r5 : 00000dc0  r4 : c0201e40
r3 : c109dd30  r2 : 00000000  r1 : 00004ee2  r0 : 00000000
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 10c5387d  Table: 0020404a  DAC: 00000051
Process swapper/0 (pid: 1, stack limit = 0x(ptrval))
Stack: (0xc02adc58 to 0xc02ae000)
dc40:                                                       e9d84048 00000003
dc60: e9e7a440 c02add18 00000028 e9e68680 c02adcf0 00000003 e9d84048 00000002
dc80: e9e7a440 c08967c0 c1108cb4 c02adcdc 10624dd3 c02adce4 10624dd3 00000005
dca0: e9e7a440 c0f5c310 00000028 c0f09998 00000005 e9d84048 00000005 c02add57
dcc0: c1108c88 e9e7a440 c02adcf0 e9d84428 e9d843b0 c0882258 000000ff 40000000
dce0: c02adce8 00000000 c02adcf0 00000003 00000000 00000090 00000000 00000000
dd00: 00000000 00000001 00000001 c02adcdf 00000000 00000190 00000002 00000005
dd20: c02add57 00000001 00000000 a10a1ef7 00000000 c1108c88 c1180250 e9d843c0
dd40: 00000001 000000de 00000000 c088d114 c0f08db4 00d843c0 00000000 a10a1ef7
dd60: 00000015 e9d84048 c1108c88 c088d470 e9d84048 c08888b4 00000000 60000013
dd80: c0eebc9c 000000ad c0da01ac 00000000 e9e7a48c c0cc6d50 c12122cc a10a1ef7
dda0: e9e7a440 e9e7a440 e9d84040 c0eebc9c e987f410 eafd6748 e9d84048 c1108c88
ddc0: e9e7a48c c0895c70 00000000 e9871f00 e9e7a440 c04eef60 00000000 eafd64bc
dde0: e9e7a534 00000000 00000000 00000000 00000001 a10a1ef7 00000000 e987f410
de00: 00000000 c1180728 00000000 00000000 c1180728 00000000 c1071854 c07fd388
de20: c120da38 e987f410 c120da3c 00000000 00000000 c07fb410 e987f410 c1180728
de40: c1180728 c07fb910 00000000 c1071834 c10004a8 c07fb65c c10004a8 c0a917b4
de60: c0da1914 e987f410 00000000 c1180728 c07fb910 00000000 c1071834 c10004a8
de80: c1071854 c07fb908 00000000 c1180728 e987f410 c07fb968 e98b8eb4 c1108c88
dea0: c1180728 c07f97d4 c1175260 c029a958 e98b8eb4 a10a1ef7 c029a96c c1180728
dec0: e9e1fa80 c1175260 00000000 c07fa844 c0f09c64 c1108c88 ffffe000 c1180728
dee0: c1108c88 ffffe000 c103b788 c07fc494 c11c2ca0 c1108c88 ffffe000 c0302f1c
df00: ebfffd96 c0346f90 c0fab8a0 c0f2ad00 00000000 00000006 00000006 c0e9e26c
df20: 00000000 c1108c88 c0eb11b0 c0e9e2e0 c11d1300 ebfffd84 ebfffd89 a10a1ef7
df40: c1071838 c11c2ca0 c10914b8 a10a1ef7 c11c2ca0 c1091804 00000007 c11d1300
df60: c11d1300 c1001180 00000006 00000006 00000000 c10004a8 0000013d 00000000
df80: c02c0504 00000000 c0cbf6e8 00000000 00000000 00000000 00000000 00000000
dfa0: 00000000 c0cbf6f0 00000000 c03010e8 00000000 00000000 00000000 00000000
dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[<c046479c>] (kmem_cache_alloc_trace) from [<c08967c0>] (meson_nfc_exec_op+0x2c4/0x3e8)
[<c08967c0>] (meson_nfc_exec_op) from [<c0882258>] (nand_readid_op+0x128/0x1c4)
[<c0882258>] (nand_readid_op) from [<c088d114>] (hynix_nand_has_valid_jedecid+0x34/0x78)
[<c088d114>] (hynix_nand_has_valid_jedecid) from [<c088d470>] (hynix_nand_decode_id+0x64/0x3fc)
[<c088d470>] (hynix_nand_decode_id) from [<c08888b4>] (nand_scan_with_ids+0xa04/0x171c)
[<c08888b4>] (nand_scan_with_ids) from [<c0895c70>] (meson_nfc_probe+0x460/0x690)
[<c0895c70>] (meson_nfc_probe) from [<c07fd388>] (platform_drv_probe+0x48/0x98)
[<c07fd388>] (platform_drv_probe) from [<c07fb410>] (really_probe+0x1e0/0x2cc)
[<c07fb410>] (really_probe) from [<c07fb65c>] (driver_probe_device+0x60/0x16c)
[<c07fb65c>] (driver_probe_device) from [<c07fb908>] (device_driver_attach+0x58/0x60)
[<c07fb908>] (device_driver_attach) from [<c07fb968>] (__driver_attach+0x58/0xcc)
[<c07fb968>] (__driver_attach) from [<c07f97d4>] (bus_for_each_dev+0x74/0xb4)
[<c07f97d4>] (bus_for_each_dev) from [<c07fa844>] (bus_add_driver+0x1b8/0x1d8)
[<c07fa844>] (bus_add_driver) from [<c07fc494>] (driver_register+0x74/0x108)
[<c07fc494>] (driver_register) from [<c0302f1c>] (do_one_initcall+0x54/0x284)
[<c0302f1c>] (do_one_initcall) from [<c1001180>] (kernel_init_freeable+0x2d4/0x36c)
[<c1001180>] (kernel_init_freeable) from [<c0cbf6f0>] (kernel_init+0x8/0x110)
[<c0cbf6f0>] (kernel_init) from [<c03010e8>] (ret_from_fork+0x14/0x2c)
Exception stack(0xc02adfb0 to 0xc02adff8)
dfa0:                                     00000000 00000000 00000000 00000000
dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
Code: e5943000 e5942014 e3130007 1a000038 (e79ae002) 
---[ end trace 28d391ed14b0f021 ]---


Martin Blumenstingl (2):
  dt-bindings: nand: meson: add support for more SoCs
  mtd: rawnand: meson: support for older SoCs up to Meson8

 .../bindings/mtd/amlogic,meson-nand.txt       | 14 ++++--
 drivers/mtd/nand/raw/meson_nand.c             | 46 +++++++++++++------
 2 files changed, 42 insertions(+), 18 deletions(-)

-- 
2.21.0

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