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Re: [Qemu-trivial] [PATCH 1/1] arm: virt: change GPIO trigger interrupt


From: Wei Huang
Subject: Re: [Qemu-trivial] [PATCH 1/1] arm: virt: change GPIO trigger interrupt to pulse
Date: Fri, 29 Jan 2016 09:13:15 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0


On 01/29/2016 08:50 AM, Peter Maydell wrote:
> On 29 January 2016 at 14:46, Shannon Zhao <address@hidden> wrote:
>> On 2016/1/29 22:35, Wei Huang wrote:
>>> On 01/29/2016 04:10 AM, Shannon Zhao wrote:
>>>> This makes ACPI work well but makes DT not work. The reason is systemd or
>>>> acpid open /dev/input/event0 failed. So the interrupt could be injected
>>>> and
>>>> could see under /proc/interrupts but guest doesn't have any action. I'll
>>>> investigate why it opens failed later.
>>>
>>>
>>> That is interesting. Could you try it with the following? This reverses
>>> the order to down-up and worked on ACPI case.
>>>
>> Yeah, that's very weird.
>>
>>> qemu_set_irq(qdev_get_gpio_in(pl061_dev, 3), 0);
>>> qemu_set_irq(qdev_get_gpio_in(pl061_dev, 3), 1);
>>>
>> I'll try this tomorrow. But even if this works, it's still weird.
> 
> I wonder if we should be asserting the GPIO pin in the powerdown-request
> hook and then deasserting it on system reset somewhere...

This is another possibility. We can try to reset the pl061 state by
hooking up with dc->reset and see what happens.

> 
> thanks
> -- PMM
> 



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