On 09/05/17 02:16, Randy Li wrote:

On 05/09/2017 12:27 AM, Heiko St?bner wrote:

quoted

Am Mittwoch, 3. Mai 2017, 10:56:24 CEST schrieb Guillaume Tucker:

quoted

The ARM Mali Midgard GPU kernel driver is only available
out-of-tree and is not going to be merged in its current form.
However, it would be useful to have its device tree bindings
merged.  In particular, this would enable distributions to create
working driver packages (dkms...) without having to patch the
kernel.

The bindings for the earlier Mali Utgard GPU family have already
been merged, so this is essentially the same scenario but for
newer GPUs (Mali-T604 ~ Mali-T880).

This series of patches first imports the bindings from the latest
driver release with some clean-up then adds a gpu node for the
rk3288 SoC.  This was successfully tested on Radxa Rock2 Square,
Firefly, Veyron Minnie and Jerry boards using Mali kernel driver
r16p0 and r12p0 user-space binary.

I won't suggest such combine. We meet some problems at mali 400 serial.
I would suggest the kernel version would match the user library.

Well, I can test it again with r12p0 kernel driver (out-of-tree)
if you want.  The user-space driver checks the version of the
kernel driver and gives up if it's not compatible.  With Midgard,
there's a range of versions that maintain kernel/userspace
compatibility unlike Utgard and older Midgard releases where they
had to exactly match.  Again, if there was a mismatch then the
user-space would fail to initialise and report an error.

Also please notice there is rk3288w, the hardware version becomes r1p0.

Sounds like a new SoC?  Does rk3288w affect rk3288 in any way?

Unless it's a special case, it seems to me that any new SoC with
a Midgard GPU would need an extra vendor compatible string in the
binding documentation and maybe a separate gpu dt node.

quoted

The actual devicetree parts are all Rockchip-specific, so I guess I'll just
pick up the whole series, including the binding doc, after the merge
window if nobody complains before that :-)

Thanks!


Guillaume