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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
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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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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