On Thu, Dec 08, 2016 at 04:21:34PM +0100, Daniel Vetter wrote:

[back from my walk, the sunset here is stellar ;-)]

On Thu, Dec 08, 2016 at 03:44:30PM +0100, Geert Uytterhoeven wrote:

quoted

Hi Thomas,

On Thu, Dec 8, 2016 at 3:37 PM, Thomas Petazzoni
[off-list ref] wrote:

quoted

On Thu, 8 Dec 2016 15:22:09 +0100, Geert Uytterhoeven wrote:

quoted

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Wut. We have like 20+ small atomic drivers nowdays.

That's fast! Only two weeks ago you said:

| Bummer, they still haven't landed. But afaik there's at least 4 of
| them floating around in various places ...

You're not talking about the same thing I believe.

When Daniel says "small atomic drivers", he talks about the relatively
small DRM drivers for SoC display controllers, such as the ones you can
find in ARM SoCs.

When you say "small driver", you're thinking about drivers for I2C or
SPI connected displays.

No, I wasn't thinking about I2C or SPI connected displays, but about simple
dumb memory-mapped frame buffers, which is what fbdev was initially
developed for.

Yeah, small drivers like these we have piles now, things exploded a lot
after atomic landed two years ago. And they seem to shrink with every
release a bit more (since lots more drivers gives you lots more insight
into what other refactorings would make sense). Those we have a big pile
of, and nowadays (at least with developers expirienced with upstream, but
not necessarily with drm) it takes but a few weeks from initial submission
to getting them merged.

What we don't yet have a nice tidy example driver of is the even simpler
"dumb framebuffer behind a slow bus with explicit/manual upload", for like
small i2c/spi panels (and conceptually also usb, even though there bw and
panel size are a bit scaled up). We've gained some really nice helpers for
this this year, and there's 3 drivers in-flight to make use of it. But
since that's right now just a hobbyist effort it's moving a bit slower
(and I was mistaken a few weeks back where I assumed that one of them
landed already).

Correction, MXSFB just landed, which is the first driver using the simple
display pipe helpers.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch