Am 24.01.2018 um 08:57 schrieb Tomi Valkeinen tomi.valkeinen@ti.com:
On 23/01/18 19:56, H. Nikolaus Schaller wrote:
Am 23.01.2018 um 17:47 schrieb Tomi Valkeinen tomi.valkeinen@ti.com:
On 23/01/18 18:22, H. Nikolaus Schaller wrote:
Well, you can refer to
https://dri.freedesktop.org/docs/drm/gpu/drm-uapi.html#open-source-userspace...
Interesting.
But I don't see how it is related to OMAP-SGX at all (except that it is about a GFX subsystem).
I understand that this is for the case we would plan to craft a proper DRM based solution so that DRM API and user space libs can be used.
At least the latest SGX driver is DRM based.
Is it DRM based or does it "use" DRM for allocating the framebuffer?
SGX appears as a DRM device, so yes, it is DRM based. To be more exact, I think the kernel driver supports different options on how to compile it. We configure it to be a DRM device.
Yes, it has two: * omaplfb * DRM
neither of these currently compile with my code :(
So that is indeed the main working site.
I have studied the code a little but did not yet understand how to use it. Tony has recommended to make this project more public to get help for making this work because someone may be able to help fixing it.
But true, the old driver may not be.
At least it has a -DDRM compile option. Maybe the 5.0 drivers need a little help by backporting things from 6.0.
Or both can be merged by forward-porting sgx530 support into the 6.0 drivers.
Hmm, I'm not familiar with these versions... Those are TI graphics SDK versions, I presume? I think anything called "Graphics SDK" is quite old. The latest SGX DDK is 1.14 which is, afaik, available in TI's processor SDK or via the git branches I pointed to.
Yes, this also supports the am33xx:
https://e2e.ti.com/support/embedded/linux/f/354/p/567306/2080513
I think the version schemes by TI and IMG are mixed. IMG scheme is SGX DDK 1.9, 1.10, 1.14 etc. While TI has (had?) Graphics SDK 4, SDK5, SDK6 based on one of the IMG DDKs.
I currently have in use:
a) omap3/am33xx: Graphics_SDK_5_01_01_02
The software on the SGX identifies itself as
root@letux:~# cat /proc/pvr/version Version SGX_DDK_Linux_CustomerTI sgxddk 1.10@2359475 (release) omap_sgx System Version String: None root@letux:~#
So this is currently SGX DDK 1.10.
This runs unmodified on am3358 and dm3730 so I expect no problem of upgrading to SGX DDK 1.14 for both of them.
b) omap4/5 from git://git.ti.com/graphics/omap5-sgx-ddk-linux.git commit: 430673f78b79eccdf308a6bbfb524209b485d2cc
I don't have it running so that I don't know the exact version it reports.
One more observation: there is no major release step in SGX DDK, i.e. it just moved from 1.9 to 1.10 and apparently 1.14.
Interestingly, both the older and the newer Graphics_SDK claim to support omap4 which seems to confirm that there are only minor differences between SoC and kernel drivers.
IMHO the user-space libs are tied to a specific IMG DDK version while SoC support is tied to a Graphics_SDK version.
This is why I think it could be possible to backport/forward-port and mix omap3/4 driver with omap4/5 driver to get a single kernel driver module for all of them.
Anyways, I could live for a while with a situation where we have different drivers for omap3/4 and omap4/5.
BR, Nikolaus