Hi Sergio, On Fri, 4 Dec 2020 at 13:31, Sergio Sota <[email protected]> wrote: > > Dear all, > > I'm building a linux system for the Olimex A13SOM module. This little module > comes > with the Allwinner A13 SOC. In the past we have been using other modules with > the > Allwinner A20 SOC and the old sunxi-linux kernel in order to have support for > all > the SOC peripherals (as the Video Engine decoder, Mali GPU, etc) > > This time we would like to use a mainline kernel, taking into account that by > now > almost all peripherals are supported in mainline. We have had luck tunning > device > tree (as we were used to use .fex files) and by now we can have Ethernet over > SPI, > Can interface over SPI, ALSA audio output, LCD RGB video output, Cryto engine > to > generate fast entropy, OpenGL ES support (thanks to LIMA driver and Mesa3d > libs) > and so on... but we would like also to have video decoding support. > > We have turned on the frontend, backend, video engine in the device tree, > build > the kernel with Cedrus V4L M2M driver, libva_vl42_request and > v4l2_request_test. > (and also set the CMA memory allocation, environment variables, etc) > > Using vainfo everything is ok, the linux driver-libva request part works, but > then > we check with v4l2_request_test utility and it fails as there is no DRM > support on > our system. We have on the system /dev/video0 and /dev/media0 but no > /dev/dri/card0 > device (in fact we selected the linux sun4i-drm driver but no message appers > on the > boot sequence regarding this, even when build as module it happens nothing...) > > We have checked the Cedrus driver information and appears to be no support > for the > DRM plane in A13 SOC (broken/missing) and as I understand that means that > part of > the picture composing work should be done by software (and that's not > reliable) > > My question is: is there DRM plane support for A13 SOC? (as time goes on I > checked > there has been work done in the mainline kernel and fixes made) Then, in case > of no > support, are there plans to add this support in the future? and finally, > could we > play video files without this DRM support? by what means?
Sorry I can't help you a lot on this. I don't know if the wiki is up to date for this. But note that A13 is similar to R8 => C.H.I.P Computer. All stuff you found on R8 will be the same for A13. Have a look at the R8 CHIP device-tree. https://elixir.bootlin.com/linux/latest/source/arch/arm/boot/dts/sun5i-r8-chip.dts And check that you have a correct TCON description in your dt. If you can, post your device-tree. And don't forget to reply if you make it works :) Regards, Clement > > Thanks in advance for your help and your time, your team have made a wonderful > work. I also apologize for my poor English, and for writing this email as > maybe this is > not the proper way to issue this questions, but didn't know other way > > Best Regards, > Sergio Sota > > -- > You received this message because you are subscribed to the Google Groups > "linux-sunxi" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/linux-sunxi/a6390bb5-69f1-47a7-864c-399109838857n%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/CAJiuCcfAh%3D2Z71W0Kw76Gdd_Rjp-TSgLkw%3DQQ3NZbMCmaSV4Hw%40mail.gmail.com.
