From: Daniel Vetter <daniel@ffwll.ch>
To: Max Staudt <mstaudt@suse.de>
Cc: "Linux Fbdev development list" <linux-fbdev@vger.kernel.org>,
michal@markovi.net,
"Bartlomiej Zolnierkiewicz" <b.zolnierkie@samsung.com>,
sndirsch@suse.com, "Oliver Neukum" <oneukum@suse.com>,
"Takashi Iwai" <tiwai@suse.com>,
dri-devel <dri-devel@lists.freedesktop.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
philm@manjaro.org,
"Bero Rosenkränzer" <bernhard.rosenkranzer@linaro.org>
Subject: Re: [RFC PATCH v2 03/13] bootsplash: Flush framebuffer after drawing
Date: Wed, 20 Dec 2017 10:45:28 +0100 [thread overview]
Message-ID: <20171220094527.GK26573@phenom.ffwll.local> (raw)
In-Reply-To: <24fd8767-bdf2-0073-2161-a0cf3b61780d@suse.de>
On Tue, Dec 19, 2017 at 05:23:52PM +0100, Max Staudt wrote:
> On 12/19/2017 05:02 PM, Daniel Vetter wrote:
> > On Tue, Dec 19, 2017 at 4:41 PM, Max Staudt <mstaudt@suse.de> wrote:
> >> On 12/19/2017 02:57 PM, Daniel Vetter wrote:
> >>> The problem is that defio is totally not how a real driver works.
> >>
> >> But they do exist and I can't ignore them.
> >>
> >> I'm afraid I don't understand - why are those, such as xenfb, not real drivers?
> >
> > I mean kms drivers. The problem is that the magic mapping that fbdev
> > expects is real pain. Everyone else, including kms, expects an
> > explicit flush operation. So instead of hacking around even more with
> > the defio corner cases that don't work, I'm suggesting we just add
> > that flush operation. At least internally.
> >
> > Fixing kms drivers to implement a better defio is probably not a
> > reasonable investement of time.
>
> Ah yes, I understand now, you mean that KMS drivers have explicit flush,
> and defio is a hack to retrofit such drivers to an API that never
> supported a flush operation (the fbdev API), but always used to expose
> the video memory directly. Right?
>
> If yes, then I agree. Fixing the defio in the KMS drivers wouldn't even
> solve my problem - I'd still need to implement flush. So might as well
> care about the flush straight away, yep!
Yup.
I'll leave the more fundamental discussion to the other thread on the
cover letter.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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next prev parent reply other threads:[~2017-12-20 9:45 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-13 19:47 [RFC PATCH v2 00/13] Kernel based bootsplash Max Staudt
2017-12-13 19:47 ` [RFC PATCH v2 01/13] bootsplash: Initial implementation showing black screen Max Staudt
2017-12-13 23:55 ` Randy Dunlap
2017-12-14 15:37 ` Max Staudt
2017-12-13 19:47 ` [RFC PATCH v2 02/13] bootsplash: Add file reading and picture rendering Max Staudt
2017-12-13 19:47 ` [RFC PATCH v2 03/13] bootsplash: Flush framebuffer after drawing Max Staudt
2017-12-13 21:35 ` Daniel Vetter
2017-12-14 15:36 ` Max Staudt
2017-12-19 12:23 ` Daniel Vetter
2017-12-19 13:34 ` Max Staudt
2017-12-19 13:57 ` Daniel Vetter
2017-12-19 14:07 ` Oliver Neukum
2017-12-31 12:53 ` Alan Cox
2018-01-03 18:04 ` Max Staudt
2017-12-19 15:41 ` Max Staudt
2017-12-19 16:02 ` Daniel Vetter
2017-12-19 16:23 ` Max Staudt
2017-12-20 9:45 ` Daniel Vetter [this message]
2017-12-19 16:09 ` Daniel Vetter
2017-12-19 16:26 ` Max Staudt
2017-12-19 21:01 ` Ray Strode
2017-12-20 13:14 ` Max Staudt
2017-12-20 15:35 ` Ray Strode
2017-12-20 16:52 ` Max Staudt
2017-12-13 19:47 ` [RFC PATCH v2 04/13] bootsplash: Add corner positioning Max Staudt
2017-12-13 19:47 ` [RFC PATCH v2 05/13] bootsplash: Add animation support Max Staudt
2017-12-13 19:47 ` [RFC PATCH v2 06/13] vt: Redraw bootsplash fully on console_unblank Max Staudt
2017-12-13 19:47 ` [RFC PATCH v2 07/13] vt: Add keyboard hook to disable bootsplash Max Staudt
2017-12-13 19:47 ` [RFC PATCH v2 08/13] sysrq: Disable bootsplash on SAK Max Staudt
2017-12-13 19:47 ` [RFC PATCH v2 09/13] fbcon: Disable bootsplash on oops Max Staudt
2017-12-13 19:47 ` [RFC PATCH v2 10/13] Documentation: Add bootsplash main documentation Max Staudt
2017-12-13 19:47 ` [RFC PATCH v2 11/13] bootsplash: sysfs entries to load and unload files Max Staudt
2017-12-13 19:47 ` [RFC PATCH v2 12/13] tools/bootsplash: Add a basic splash file creation tool Max Staudt
2017-12-13 19:47 ` [RFC PATCH v2 13/13] tools/bootsplash: Add script and data to create sample file Max Staudt
2017-12-13 19:52 ` [RFC PATCH v2 00/13] Kernel based bootsplash Max Staudt
2017-12-19 16:16 ` Daniel Vetter
2017-12-19 17:04 ` Max Staudt
2017-12-19 17:26 ` Daniel Vetter
2017-12-19 18:40 ` Max Staudt
2017-12-20 9:43 ` Daniel Vetter
2017-12-20 10:06 ` Neil Armstrong
2017-12-20 10:14 ` Daniel Vetter
2017-12-20 14:55 ` Max Staudt
2017-12-20 15:11 ` Daniel Vetter
2017-12-20 15:19 ` Daniel Vetter
2017-12-20 15:22 ` Daniel Vetter
2017-12-20 16:23 ` Max Staudt
2017-12-20 16:15 ` Max Staudt
2017-12-31 12:44 ` Alan Cox
2018-01-03 18:00 ` Max Staudt
2017-12-20 14:16 ` Max Staudt
2017-12-20 14:10 ` Max Staudt
2017-12-31 12:35 ` Alan Cox
2018-01-03 17:56 ` Max Staudt
2017-12-19 20:30 ` Ray Strode
2017-12-20 13:03 ` Max Staudt
2017-12-20 15:21 ` Ray Strode
2017-12-20 16:44 ` Max Staudt
2017-12-21 14:51 ` Ray Strode
2017-12-21 16:32 ` Max Staudt
2017-12-20 11:08 ` Johannes Thumshirn
2017-12-20 11:22 ` Daniel Stone
2017-12-20 12:48 ` Johannes Thumshirn
2017-12-29 17:13 ` Jani Nikula
2018-01-03 17:38 ` Max Staudt
2017-12-21 9:48 ` Daniel Vetter
2017-12-21 16:52 ` Max Staudt
2017-12-21 15:00 ` Philip Müller
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