linux-kernel - Re: broadsheetfb and fbcon

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Message-ID: <AANLkTim4drroXSxsYkngQWiKL2FjIln4ZBf8zKyPLaJN@mail.gmail.com>
Date:	Tue, 8 Jun 2010 13:03:49 -0700
From:	Robert Emanuele <rob@...nuele.us>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	linux-kernel@...r.kernel.org, jayakumar.lkml@...il.com
Subject: Re: broadsheetfb and fbcon

On Tue, Jun 8, 2010 at 6:21 AM, Konrad Rzeszutek Wilk
<konrad.wilk@...cle.com> wrote:
> On Mon, Jun 07, 2010 at 10:19:27AM -0700, Robert Emanuele wrote:
>> There are no module parameters for fbcon or broadsheetfb.
>>
>> On Mon, Jun 7, 2010 at 9:28 AM, Konrad Rzeszutek Wilk
>> >> Are those kind of updates a limit of the broadsheet driver or fbcon?
>> >
>> > I thought there was an update value on how often it should redraw. Did
>> > you do a modinfo on the driver?
>
> Please do not post your response on top.
>
> What I was thinking about is the delay variable:
>
> 1056 static struct fb_deferred_io broadsheetfb_defio = {
> 1057         .delay          = HZ/4,
> 1058         .deferred_io    = broadsheetfb_dpy_deferred_io,
> 1059 };
> 1060
>
>
> Try changing that to a higher number and seeing if that fixes your
> problem. If so, you and I can work on a patch that sets a parameter
> for this.
>

Increasing the delay value to a larger value (more updates/sec) or a
smaller value (fewer updates/sec) in the broadsheet driver does not
affect the screen update rate.  Does the fbcon used the deferred io
handler?

Thanks,

Rob
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