[PATCH v6 2/5] PCI: brcmstb: Configure HW CLKREQ# mode appropriate for downstream device

[Sam Edwards]

On 6/23/23 08:40, Jim Quinlan wrote:

Hi Jim,

As I understand, the issue that this patch fixes can be difficult to 
trigger reliably. So I'll report that the abort occurs 100% of the time 
on a Compute Module 4, installed in slot 3 of a Turing Pi 2 cluster 
board, when a bootloader (U-Boot, in my case) is in the boot path. The 
third slot of the TP2 board connects to an ASM1061 chip with the CLKREQ# 
line left floating. I do not know why the bootloader is necessary for 
the crash to occur; I suspect it's timing-related.

With this patch applied to my kernel, my observed crash rate goes from 
100% to 0%, so:

> Signed-off-by: Jim Quinlan <james.quinlan at broadcom.com>
> Tested-by: Florian Fainelli <f.fainelli at gmail.com>
> Tested-by: Cyril Brulebois <cyril at debamax.com>
Tested-by: Sam Edwards <CFSworks at gmail.com>

Many thanks,
Sam