Re: [PATCH] fbdev: Remove udlfb driver

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Hi

Am 30.11.20 um 19:39 schrieb Mikulas Patocka:


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.

That's confusing. DIRTYFB is only for DRM.

And why can links not run as DRM master mode? If it renders to the terminal, it should act like a composer. In that case it almost certainly wants master status.

Best regards
Thomas


Mikulas


--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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