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Date: Thu, 21 Mar 2024 12:00:53 -0500
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Subject: Re: Is RTL8822CE with Kernel 6.1 for imx6
To: =?UTF-8?B?5pa95bCP5LiwKOWMu+eUqOWItuWTgeS6p+S4mumbhuWboi3ljLvnlKjliLY=?=
 =?UTF-8?B?5ZOB6ZuG5Zui5pys6YOoKQ==?= <shixiaofeng@weigaogroup.com>,
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From: Larry Finger <Larry.Finger@lwfinger.net>
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On 3/21/24 08:13, 施小丰(医用制品产业集团-医用制品集团本部) wrote:
> 
> Dear linux wireless team:
>     This is Danny, a embedded software engineer
> 
>     I have successfully run the 8822CE module in Linux kernel 5.4 with imx6 
> hardware platform.
>     But it doesnt work in Kernel 6.1 though i have put many efforts to this issue.
>    So, we'd like to check with you whether the RTL8822CE chip is compatible with 
> Linux Kernel 6.1.
>     My usage is as below:
> 
>  1. imx6 board
>  2. build RTL8822CE as M in kernel 6.1 menuconfig
>  3. Each time after the board startup, i run four commands 
> 
>      insmod rtw88_core.ko
>      insmod rtw88_pci.ko
>      insmod rtw88_8822c.ko
>      insmod rtw88_8822ce.ko
> 4.  When run  insmod rtw88_8822ce.ko, in most cases, the error will show as 
> below. (few times can work)
>   Detail error log is attached.
>    Same step (1) -(4) works very well with kernel 5.4 in same hadrware platform.
> ================
> root@imx6solosabresd:~/8822CE# ./insmod.sh
> [   60.541840] rtw_8822ce 0000:01:00.0: enabling device (0000 -> 0003)
> [   60.558145] rtw_8822ce 0000:01:00.0: Firmware version 9.9.4, H2C version 15
> [   60.567135] rtw_8822ce 0000:01:00.0: Firmware version 9.9.15, H2C version 15
> [   60.706697] 8<--- cut here ---
> [   60.709775] Unhandled fault: imprecise external abort (0x1406) at 0x01b77740
> [   60.716832] [01b77740] *pgd=00000000
> [   60.720421] Internal error: : 1406 [#1] PREEMPT SMP ARM
> [   60.725653] Modules linked in: rtw88_8822ce(+) rtw88_8822c rtw88_pci rtw88_core
> [   60.732991] CPU: 0 PID: 796 Comm: insmod Not tainted 6.1.22-g9c59b15a9e72 #1
> [   60.740049] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
> [   60.746580] PC is at rtw_pci_read32+0x14/0x18 [rtw88_pci]
> [   60.752015] LR is at rtw_chip_info_setup+0x48/0x588 [rtw88_core]
> [   60.758170] pc : [<7f026048>]    lr : [<7f0001c0>]    psr: 60010013
> [   60.764442] sp : c1d0dd28  ip : 00000201  fp : 89344040
> [   60.769670] r10: 88b397a0  r9 : 88b3f890  r8 : 00000200
> [   60.774897] r7 : 000003da  r6 : 000003d9  r5 : 7f03a2c8  r4 : 88b397a0
> [   60.781428] r3 : c09200f0  r2 : 00000000  r1 : 000000f0  r0 : 00000000
> [   60.787959] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
> [   60.795100] Control: 10c5387d  Table: 15d10059  DAC: 00000051
> [   60.800848] Register r0 information: NULL pointer
> [   60.805564] Register r1 information: non-paged memory
> [   60.810620] Register r2 information: NULL pointer

Danny,

The RTL8822CE certainly works with kernel 6.1 on X86_64 hardware. Routine 
rtw_pci_read32() where the unhandled fault happens has not been changed since 
kernel 5.2.