Re: [PATCH 00/11] drm: bridge: Add Samsung MIPI DSIM bridge

[Marek Szyprowski <m.szyprowski@samsung.com>]

On 11.04.2022 16:39, Adam Ford wrote:
> On Mon, Apr 11, 2022 at 8:56 AM Marek Szyprowski
> <m.szyprowski@samsung.com> wrote:
>> On 08.04.2022 18:20, Jagan Teki wrote:
>>> This series supports common bridge support for Samsung MIPI DSIM
>>> which is used in Exynos and i.MX8MM SoC's.
>>>
>>> Previous RFC can be available here [1].
>>>
>>> The final bridge supports both the Exynos and i.MX8MM DSI devices.
>>>
>>> On, summary this patch-set break the entire DSIM driver into
>>> - platform specific glue code for platform ops, component_ops.
>>> - common bridge driver which handle platform glue init and invoke.
>>>
>>> Patch 0000:   Samsung DSIM bridge
>>>
>>> Patch 0001:   platform init flag via driver_data
>>>
>>> Patch 0002/9:   bridge fixes, atomic API's
>>>
>>> Patch 0010:   document fsl,imx8mm-mipi-dsim
>>>
>>> Patch 0011:   add i.MX8MM DSIM support
>>>
>>> Tested in Engicam i.Core MX8M Mini SoM.
>>>
>>> Anyone interested, please have a look on this repo [2]
>>>
>>> [2] https://protect2.fireeye.com/v1/url?k=930e329a-f28527b5-930fb9d5-74fe485cbfe7-b0c53e2d688ddbc5&q=1&e=e6aa727d-5ae2-4ca5-bff3-7f62d8fae87e&u=https%3A%2F%2Fgithub.com%2Fopenedev%2Fkernel%2Ftree%2Fimx8mm-dsi-v1
>>> [1] https://lore.kernel.org/linux-arm-kernel/YP2j9k5SrZ2%2Fo2%2F5@ravnborg.org/T/
>>>
>>> Any inputs?
>> I wanted to test this on the Exynos, but I wasn't able to find what base
>> should I apply this patchset. I've tried linux-next as well as
>> 95a2441e4347 ("drm: exynos: dsi: Switch to atomic funcs").
>>
>> Please note that pointing a proper base for the patchset is really
>> essential if you really want others to test it.
> Can you clone his repo and test that?  He posted it above.  I was
> going to clone it at some point this week to give it a try.

Okay, my fault. I've missed that.

There is a trivial compilation issue, 
drivers/gpu/drm/exynos/exynos_drm_dsi.c lacks "#include 
<linux/gpio/consumer.h>" after conversion. Besides that, it simply nukes 
on the simplest Exynos setup (exynos4210-trats) during the initialization:

[drm] Exynos DRM: using 11c00000.fimd device for DMA mapping operations
exynos-drm exynos-drm: bound 11c00000.fimd (ops fimd_component_ops)
8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000048
[00000048] *pgd=00000000
Internal error: Oops: 5 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 
5.17.0-rc2-00577-g22e968113668-dirty #11635
Hardware name: Samsung Exynos (Flattened Device Tree)
PC is at exynos_dsi_bind+0x14/0x3c
LR is at component_bind_all+0x130/0x290
pc : [<c06924e0>]    lr : [<c06b0f6c>]    psr: 60000113
sp : c1cafcb8  ip : 00000002  fp : c0f4a53c
r10: c135e6a8  r9 : c1efd800  r8 : 00000000
r7 : c26d2100  r6 : c2c69fc0  r5 : 00000018  r4 : 00000000
r3 : c06924cc  r2 : 00000002  r1 : 00000000  r0 : c1efd800
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 10c5387d  Table: 4000404a  DAC: 00000051
Register r0 information: slab kmalloc-2k start c1efd800 pointer offset 0 
size 2048
Register r1 information: NULL pointer
Register r2 information: non-paged memory
Register r3 information: non-slab/vmalloc memory
Register r4 information: NULL pointer
Register r5 information: non-paged memory
Register r6 information: slab kmalloc-64 start c2c69fc0 pointer offset 0 
size 64
Register r7 information: slab kmalloc-64 start c26d2100 pointer offset 0 
size 64
Register r8 information: NULL pointer
Register r9 information: slab kmalloc-2k start c1efd800 pointer offset 0 
size 2048
Register r10 information: non-slab/vmalloc memory
Register r11 information: non-slab/vmalloc memory
Register r12 information: non-paged memory
Process swapper/0 (pid: 1, stack limit = 0x(ptrval))
Stack: (0xc1cafcb8 to 0xc1cb0000)
...
  exynos_dsi_bind from component_bind_all+0x130/0x290
  component_bind_all from exynos_drm_bind+0xe8/0x194
  exynos_drm_bind from try_to_bring_up_master+0x208/0x2d0
  try_to_bring_up_master from component_master_add_with_match+0xd0/0x104
  component_master_add_with_match from exynos_drm_platform_probe+0xe8/0x118
  exynos_drm_platform_probe from platform_probe+0x80/0xc0
  platform_probe from really_probe+0xfc/0x440
  really_probe from __driver_probe_device+0xa4/0x204
  __driver_probe_device from driver_probe_device+0x34/0xd4
  driver_probe_device from __driver_attach+0x114/0x184
  __driver_attach from bus_for_each_dev+0x64/0xb0
  bus_for_each_dev from bus_add_driver+0x170/0x20c
  bus_add_driver from driver_register+0x78/0x10c
  driver_register from exynos_drm_init+0xe0/0x14c
  exynos_drm_init from do_one_initcall+0x6c/0x3a4
  do_one_initcall from kernel_init_freeable+0x1c4/0x214
  kernel_init_freeable from kernel_init+0x18/0x12c
  kernel_init from ret_from_fork+0x14/0x2c
Exception stack(0xc1caffb0 to 0xc1cafff8)
ffa0:                                     00000000 00000000 00000000 
00000000
ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
ffe0: 00000000 00000000 00000000 00000000 00000013 00000000
Code: e5904040 e1a00002 e3a02002 e1a01004 (e5945048)
---[ end trace 0000000000000000 ]---
Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
CPU1: stopping
CPU: 1 PID: 0 Comm: swapper/1 Tainted: G      D 
5.17.0-rc2-00577-g22e968113668-dirty #11635
Hardware name: Samsung Exynos (Flattened Device Tree)
  unwind_backtrace from show_stack+0x10/0x14
  show_stack from dump_stack_lvl+0x58/0x70
  dump_stack_lvl from do_handle_IPI+0x2ec/0x36c
  do_handle_IPI from ipi_handler+0x18/0x20
  ipi_handler from handle_percpu_devid_irq+0xd0/0x394
  handle_percpu_devid_irq from generic_handle_domain_irq+0x44/0x88
  generic_handle_domain_irq from gic_handle_irq+0x88/0xac
  gic_handle_irq from generic_handle_arch_irq+0x58/0x78
  generic_handle_arch_irq from __irq_svc+0x54/0x88
Exception stack(0xc1cd1f48 to 0xc1cd1f90)
1f40:                   00000001 c0eff5a4 00000001 c011ca80 c1208f0c 
c1353420
1f60: 00000000 c1d8d000 00000000 c0f34234 c1d8d000 00000000 c0eeee98 
c1cd1f98
1f80: c0109144 c0109148 20000013 ffffffff
  __irq_svc from arch_cpu_idle+0x40/0x44
  arch_cpu_idle from default_idle_call+0x74/0x2c4
  default_idle_call from do_idle+0x1cc/0x284
  do_idle from cpu_startup_entry+0x18/0x1c
  cpu_startup_entry from 0x401018b4
---[ end Kernel panic - not syncing: Attempted to kill init! 
exitcode=0x0000000b ]---


I will try to take a look into this later in the evening.


Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland


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