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:   Mon, 19 Aug 2019 14:25:34 -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 Sat, Aug 17, 2019 at 2:03 AM Tony Lindgren <tony@...mide.com> wrote:
>
> * Adam Ford <aford173@...il.com> [190816 23:02]:
> > On Wed, Aug 14, 2019 at 8:16 AM Tony Lindgren <tony@...mide.com> wrote:
> > > 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.
>
> My estimate is am3517 is wired the same way as omap34xx with a 60%
> chance, then 30% chance it's wired the same way as omap36xx, and then
> 10% chance for similar wiring to am335x.. So hopefully that leaves 0%
> chance for yet something different for it's wiring :)

Based on [1], I went under the assumption it was wired like the
omap34xx.  I applied your omap34 patches to the am3517.dtsi, and I was
able to get the same response as I did for the omap3530.  Do you want
me to post the patches to the mailing list, or do you want to do it?

adam

[1] - http://processors.wiki.ti.com/index.php/GSG:_AM35x_and_OMAP35x_Rebuilding_the_Software#How_to_check_for_SGX_core_revision

>
> If you have a chance please give it a try. Also check the TRM for the
> sgx sysconfig register bits to see which of the above matches, and if
> 3517 has a related rstctrl register like am335x has.
>
> Regards,
>
> Tony