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From:   Aaron Ma <aaron.ma@canonical.com>
Subject: Re: [PATCH 1/2] Input: synaptics-rmi4 - clear irqs before set irqs
To:     Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc:     linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
        Cheiny@synaptics.com, aduggan@synaptics.com,
        benjamin.tissoires@redhat.com
References: <20190220164200.31044-1-aaron.ma@canonical.com>
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Message-ID: <189fc7c3-d0f7-a25e-9d4d-446b095e853f@canonical.com>
Date:   Fri, 14 Jun 2019 12:26:07 +0800
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On 6/12/19 1:35 AM, Dmitry Torokhov wrote:
> On Tue, Jun 11, 2019 at 12:55:58AM +0800, Aaron Ma wrote:
>> On 6/10/19 12:55 AM, Dmitry Torokhov wrote:
>>> Hi Aaron,
>>>
>>> On Wed, Feb 20, 2019 at 05:41:59PM +0100, Aaron Ma wrote:
>>>> rmi4 got spam data after S3 resume on some ThinkPads.
>>>> Then TrackPoint lost when be detected by psmouse.
>>>> Clear irqs status before set irqs will make TrackPoint back.
>>> Could you please give me an idea as to what this spam data is?
>>>
>> It should be some data 0 during suspend/resume.
>> Actually I don't know how these data 0 is produced.
>> Not all synaptics touchpads have this issue.
>>
>>> In F03 probe we clear all pending data before enabling the function,
>> Yes we did, but not after resume.
> Yes, I understand that. The question I was asking: if we add code
> consuming all pending data to f03->suspend(), similarly to what we are
> doing at probe time, will it fix the issue with trackstick losing
> synchronization and attempting disconnect?
> 

I just do some test via adding code in suspend or resume.
But they didn't work out.

>>> maybe the same needs to be done on resume, instead of changing the way
>>> we handle IRQ bits?
>> This patch is supposed to clear irq status like it in fn probe. Not
>> changing IRQ bits.
> What I meant is changing how we enable IRQ bits. I would really prefer
> we did not lose IRQ state for other functions when we enable interrupts
> for given function.
> 

Not only F03 with problem, F12 too which is touchpad .
User verified this patch fixes problem of F12 too.
Clear IRQ status before enable IRQ should be safe.

Or we can add code before enable IRQ in F03/F12.

Thanks,
Aaron

> Thanks.
> 
> -- Dmitry
>