CS5536 Spurious Interrupt Problem on Loongson2
Hi all,
During the discussion of Loongson/Yeeloong driver mainlining, both Alexandre Oliva and Aaro Koskinen reported the their Loongson machine is being bombarded by spurious interrupt from CS5536 when using the libata driver. Continue replying the original thread is off-topic and difficult to follow, so here I start a new thread for this problem.
Quoted 7 lines · Alexandre Oliva
Tom, why do you say bisecting this is impossible? I realize you wrote you did so for 24 hours non-stop, but... I'm curious as to what obstacles you ran into. It's such a reproducible problem for me that I can't see how bisecting it might be difficult.
Or were by any chance you talking about the reboot/shutdown problem then?
I meant the already-identified and fixed reboot/shutdown problem, not the CS3356 spurious interrupt problem.
To be honest, I don't understand why the libata driver can even be a problem at all. To add some background information, I started using the libata driver since 2014, and to this day, I NEVER encountered any problem with it. And not only me, I had a personal project - a prebuilt kernel for Yeeloong laptops, and at least three different users had tried it. In addition, Jiaxun Yang also who did some independent work - none of these people have reported any problem similar to this one.
Therefore, I'm suspicious that this problem is related to a specific firmware/ hardware revision, or a probabilistic issue. PMON/EC version may be the first thing we need to confirm.
My system is,
$ cat /proc/cmdline PMON_VER=LM8089-1.4.9a EC_VER=PQ1D28 machtype=lemote-yeeloong-2f-8.9inches
$ cat /proc/interrupts
CPU0
1: 11 XT-PIC 1 i8042
2: 0 XT-PIC 2 cascade
8: 0 XT-PIC 8 rtc0
9: 0 XT-PIC 9 snd_cs5535audio
10: 0 XT-PIC 10 sci
12: 87 XT-PIC 12 i8042
14: 6418 XT-PIC 14 pata_cs5536
18: 0 MIPS 2 cascade
22: 0 MIPS 6 cascade
23: 148498 MIPS 7 timer
37: 296 bonito_irq eth0
ERR: 0Interrupts have no problem at all.
(P.S: Interrupt 10, sci, is the platform driver I'm developing, just ignore it)
Thus, I don't see any CS5536 interrupt problem when using the libata driver. My first question is, what are your EC/PMON versions? can you report back?
Thanks,
Tom Li
Hi,
Quoted 2 lines · Tom Li
Continue replying the original thread is off-topic and difficult to follow, so here I start a new thread for this problem.
The proper thread is here:
https://lore.kernel.org/linux-mips/[email protected]/#r
Quoted 8 lines
Therefore, I'm suspicious that this problem is related to a specific
firmware/hardware revision, or a probabilistic issue. PMON/EC version may be the first thing we need to confirm.My system is,
$ cat /proc/cmdline PMON_VER=LM8089-1.4.9a EC_VER=PQ1D28 machtype=lemote-yeeloong-2f-8.9inches
Mini-PC does not have any EC. PMON is:
Version: PMON2000 2.1 (Bonito) #121: Mon Jan 5 14:19:11 CST 2009.
But firmware upgrade is not an option for me.
Quoted 1 line
Interrupts have no problem at all.
You should check "/proc/irq/14/spurious". Anyway, it well may be that some machines work fine.
A.