linux-kernel - Re: [PATCH 2.6.20 1/1] fbdev,mm: hecuba/E-Ink fbdev driver

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Date:	Wed, 21 Feb 2007 11:55:17 -0500
From:	"Jaya Kumar" <jayakumar.lkml@...il.com>
To:	"Geert Uytterhoeven" <geert@...ux-m68k.org>
Cc:	"Paul Mundt" <lethal@...ux-sh.org>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Linux Frame Buffer Device Development" 
	<linux-fbdev-devel@...ts.sourceforge.net>,
	"Linux Kernel Development" <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, "James Simmons" <jsimmons@...radead.org>
Subject: Re: [PATCH 2.6.20 1/1] fbdev,mm: hecuba/E-Ink fbdev driver

On 2/20/07, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> Don't you need a way to specify the maximum deferral time? E.g. a field in
> fb_info.
>

You are right. I will need that. I could put that into struct
fb_deferred_io. So drivers would setup like:

static struct fb_deferred_io hecubafb_defio = {
        .delay          = HZ,
        .deferred_io    = hecubafb_dpy_update,
};

where that would be:
struct fb_deferred_io {
        unsigned long delay;    /* delay between mkwrite and deferred handler */
        struct mutex lock;      /* mutex that protects the page list */
        struct list_head pagelist;      /* list of touched pages */
        struct delayed_work deferred_work;
        void (*deferred_io)(struct fb_info *info, struct list_head
*pagelist); /* callback */
};

and the driver would do:
...
info->fbdefio = hecubafb_defio;
register_framebuffer...

When the driver calls register_framebuffer and unregister_framebuffer,
I can then do the init and destruction of the other members of that
struct. Does this sound okay?

Thanks,
jaya
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