linux-kernel - RE: [PATCH v5] Fix the resolution issue in ChromeOS

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Date:	Sat, 13 Jun 2015 15:04:38 +0800
From:	"Hn Chen" <hn.chen@...dahitech.com>
To:	"Frans Klaver" <fransklaver@...il.com>
Cc:	<linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
Subject: RE: [PATCH v5] Fix the resolution issue in ChromeOS

Hi, Frans,

It can only be delay for the firmware implementation now.

Hn.chen

-----Original Message-----
From: Frans Klaver [mailto:fransklaver@...il.com] 
Sent: Friday, June 12, 2015 6:02 PM
To: Hn Chen
Cc: linux-input@...r.kernel.org; linux-kernel@...r.kernel.org; Dmitry Torokhov
Subject: Re: [PATCH v5] Fix the resolution issue in ChromeOS

On Wed, Jun 10, 2015 at 4:51 PM, Hn Chen <hn.chen@...dahitech.com> wrote:
> Hi, Frans,
>
>> Alright, I was just wondering. Seems like a waste to be waiting for something that's already finished ;-).
>> There's of course a risk that times may fluctuate between firmware versions. Did you take that into account in the code?
>> Or is there a hard maximum time for these operations defined for the firmware?
> Thanks for your reminding.
> After I check with the firmware guy, I will change the value of delay.
> What we do here is to read the data from flash and calculate their 
> checksum and will cost about 6ms for 1024 bytes. So there is a delay for 10 ms per 1024 bytes.
> But in some situation, the controller will change it's running 
> frequency(like do noise immunity), 10ms could be too margin.

Any chance this sort of thing could be detected?