Hi Neil,

this is just a drive-by question and I'm looping in Todd in the hopes for
a discussion or clarification.

On Fri, Oct 30, 2020 at 3:37 PM Neil Armstrong [off-list ref] wrote:

The GE2D is a 2D accelerator with various features like configurable blitter
with alpha blending, frame rotation, scaling, format conversion and colorspace
conversion.

The driver implements a Memory2Memory VB2 V4L2 streaming device permitting:
- 0, 90, 180, 270deg rotation
- horizontal/vertical flipping
- source cropping
- destination compositing
- 32bit/24bit/16bit format conversion

This adds the support for the GE2D version found in the AXG SoCs Family.

We are starting to see a bunch of these really nicely abstracted blitters
and other 2D-accelerators now.

Is stuff like Android going to pick up and use this to blit and blend
generic buffers?

Or is this in essence a camera and/or video out accelerator thing?

The placement of this driver in drivers/media makes me think that
it is for cameras or video output, but the functionality is actually
quite generic.

I've been half-guessing that userspace like Android actually mostly
use GPUs to composit their graphics, but IIUC this can sometimes be
used for 2D compositing, and when used will often be quicker and/or
more energy efficient than using a GPU for the same task.

Yours,
Linus Walleij

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel