Re: [RFC PATCH 0/7] add at91sam9 LCDC DRM driver

[Sam Ravnborg <sam@ravnborg.org>]

The at91sam9263 has a few interesting "GPU" features:

- 2D memory addressing
  Data sheet says:
	The LCDC can be configured to work on a frame buffer
	larger than the actual screen size. By changing the
	values in a few registers, it is easy to move the
	displayed area along the frame buffer width and height

- 2D Graphics controller
  Data sheet says:
	The Two D Graphics Controller (TDGC) features a
	hardware accelerator which highly simplifies drawing
	tasks and graphic management operations.
	The hardware accelerator makes it easy to draw lines
	and complex polygons and to perform block transfers
	within the frame buffer.
	The TDGC also features a draw command queue that
	automatically executes a more complex drawing function
	that is composed of several register accesses.

The datasheet text is from: chapter 43.9 + chapter 44:
http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-6249-32-bit-ARM926EJ-S-Embedded-Microprocessor-SAM9263_Datasheet.pdf
(No NDA required)

Based on the above, would it be possible to utilise some
of these features without any dedicated userspace (mesa) support?
Any other driver that has something similar that can be used
for inspiration?

Or is this in reality a simple GPU that requires a
dedicated GPU driver?

	Sam