linux-kernel - Re: Lay common foundation to make PVR/SGX work without hacks on OMAP34xx, OMAP36xx, AM335x and potentially OMAP4, OMAP5

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Date:   Fri, 16 Aug 2019 18:01:53 -0500
From:   Adam Ford <aford173@...il.com>
To:     Tony Lindgren <tony@...mide.com>
Cc:     "H. Nikolaus Schaller" <hns@...delico.com>,
        Merlijn Wajer <merlijn@...zup.org>,
        Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>,
        Philipp Rossak <embed3d@...il.com>,
        moaz korena <moaz@...ena.xyz>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        Filip Matijević <filip.matijevic.pz@...il.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        linux-omap <linux-omap@...r.kernel.org>,
        kernel@...a-handheld.com,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>, maemo-leste@...ts.dyne.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Lay common foundation to make PVR/SGX work without hacks on
 OMAP34xx, OMAP36xx, AM335x and potentially OMAP4, OMAP5

On Wed, Aug 14, 2019 at 8:16 AM Tony Lindgren <tony@...mide.com> wrote:
>
> * H. Nikolaus Schaller <hns@...delico.com> [190814 10:34]:
> >
> > > Am 14.08.2019 um 11:47 schrieb Tony Lindgren <tony@...mide.com>:
> > >
> > > * H. Nikolaus Schaller <hns@...delico.com> [190814 08:57]:
> > >> I also have pushed good news to
> > >>
> > >>    https://github.com/openpvrsgx-devgroup/linux_openpvrsgx/tree/letux-pvr
> > >>
> > >> Thanks to the help from the Pyra community, I was able to get a (binary) reference
> > >> implementation using DRM that works on Pyra/OMAP5. At least the gles1test1.
> > >>
> > >> With that reference setup I was able to fix my Makefiles for the staging/pvr implementation.
> > >>
> > >> I have tested that it works with v4.19.66 and v5.3-rc4 (LPAE build of the LetuxOS kernel tree)
> > >> on the Pyra.
> > >>
> > >> In which areas does this tree go beyond the TI SDK/IMG DDK 1.14?
> > >>
> > >> * includes internal API fixes for kernels up to v5.3
> > >> * lives in drivers/staging/pvr/1.14.3699939 - so that we can ask for inclusion in linux-next
> > >> * has Kconfig and Makefiles for in-kernel configuration (no separate build system)
> > >> * builds separate kernel modules for omap3430, omap3630, am335x, omap4, omap5, dra7 etc.
> > >>  pvrsrvkm
> > >>  e.g. pvrsrvkm_omap_omap5_sgx544_116
> > >> * the correct kernel module is automatically probed by matching .compatible in device tree
> > >>  so that the code is multi-platform friendly
> > >> * includes SoC integration for OMAP3/4/5 and has some preliminary bindings documentation
> > >> * code base should also support JZ4780/CI20 and some Intel Atom processors (CedarView, Poulsbo)
> > >> * has got a ToDo to describe what should be done during staging phase
> > >>
> > >>    https://github.com/openpvrsgx-devgroup/linux_openpvrsgx/blob/letux/latest-pvr/drivers/staging/pvr/TODO
> > >>
> > >> My plans for the next steps are:
> > >>
> > >> * do more testing (e.g. X11, kmscube)
> > >> * check if and/or how it can run on am335x (BeagleBone) or OMAP3 (e.g. GTA04, OpenPandora)
> > >> * try a JZ480/CI20 build (unfortuantely I have no HDMI there with mainline kernels and I am
> > >>  missing the user-space libraries for MIPS).



> > >
> > > That sounds good to me, just one comment. Before getting these into
> > > staging, I'd like to have omap variants use proper interconnect
> > > target module in devicetree like we already have in omap4.dtsi
> > > as target-module@...00000. This should simplify things further
> > > as the module child device driver(s) can just enable things with
> > > runtime PM and we can leave out all the legacy hwmod platform data
> > > that sounds like you're still carrying.
> >
> > Yes, there is still a lot of SoC-glue included:
> >
> >       https://github.com/openpvrsgx-devgroup/linux_openpvrsgx/commits/letux/omap-pvr-soc-glue
> >
> > It would indeed be a good move to simplify and reduce the glue code
> > and make it more maintainable / stable / identical on different platforms.
>
> OK yeah all that should just disappear :)
>
> > > I have patches here to add similar interconnect target modules for
> > > at least omap34xx, omap36xx, omap5, and am335x that I'll try to post
> > > later on today to play with. For am335x, things still depend on the
> > > recentely posted prm rstctrl patches. I'm not sure if I already
> > > did a dts patch for dra7 yet, need to check.
> >
> > I assume it is not yet in linux-next... So something for v5.5 or later.
>
> Well I just posted some sgx interconnect target module patches. We might
> still have them in v5.4 assuming people manage to review and test them.

Nikolaus,

I tested Tony's change and I can confirm that I can read the value
when enabled.  Should I apply his patches to your branch before I
test, or is it go too to go as-is? I've got an AM3517, OMAP35 and a
DM3730.  I am not sure if the AM3517 is even on the radar, but it has
an sgx530 as well.

adam

>
> Regards,
>
> Tony