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From: Mikulas Patocka <mpatocka@redhat.com>
To: Daniel Vetter <daniel@ffwll.ch>
Cc: Thomas Zimmermann <tzimmermann@suse.de>,
	linux-fbdev@vger.kernel.org, geert+renesas@glider.be,
	corbet@lwn.net, daniel.vetter@ffwll.ch,
	linux-doc@vger.kernel.org, bernie@plugable.com,
	dri-devel@lists.freedesktop.org, sam@ravnborg.org
Subject: Re: [PATCH] fbdev: Remove udlfb driver
Date: Mon, 30 Nov 2020 13:39:17 -0500 (EST)	[thread overview]
Message-ID: <alpine.LRH.2.02.2011301241470.21432@file01.intranet.prod.int.rdu2.redhat.com> (raw)
In-Reply-To: <20201130154147.GT401619@phenom.ffwll.local>



On Mon, 30 Nov 2020, Daniel Vetter wrote:

> On Mon, Nov 30, 2020 at 09:31:15AM -0500, Mikulas Patocka wrote:
> > 
> > The framebuffer driver supports programs running full-screen directly on 
> > the framebuffer console, such as web browser "links -g", image viewer 
> > "fbi", postscript+pdf viewer "fbgs", ZX Spectrum emulator "fuse-sdl", 
> > movie player "mplayer -vo fbdev". The DRM driver doesn't run them.
> 
> Hm this should in general work on drm drivers. Without that it's clear the
> switch-over isn't really ready yet.

I fixed it with this patch two years ago: 
https://lists.freedesktop.org/archives/dri-devel/2018-June/179023.html

But the patch never went through and the fb_defio feature was removed in 
the kernel 5.6 (commit d0c4fc5a4814e431c15272935c8dc973c18073aa).


Without fb_defio, the only other possibility how to update the screen is 
the ioctl DRM_IOCTL_MODE_DIRTYFB. But this ioctl requires master mode, so 
user programs like "links -g" can't issue it.

Mikulas


  reply	other threads:[~2020-11-30 18:40 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-30 12:52 [PATCH] fbdev: Remove udlfb driver Thomas Zimmermann
2020-11-30 14:31 ` Mikulas Patocka
2020-11-30 15:41   ` Daniel Vetter
2020-11-30 18:39     ` Mikulas Patocka [this message]
2020-11-30 21:06       ` Daniel Vetter
2020-12-01 11:26         ` Mikulas Patocka
2020-12-01  8:07       ` Thomas Zimmermann
2020-12-01 11:20         ` Mikulas Patocka
2020-12-02  7:55           ` Thomas Zimmermann
2020-12-02  8:01             ` Thomas Zimmermann
2020-12-02  8:29             ` Pekka Paalanen
2020-12-02 17:52             ` Daniel Vetter
2020-12-01  8:02   ` Thomas Zimmermann
2020-12-01 10:44     ` Mikulas Patocka
2020-12-01 20:09       ` Mikulas Patocka

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