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, 7 Oct 2019 21:24:08 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Tero Kristo <t-kristo@...com>
Cc:     Tony Lindgren <tony@...mide.com>,
        Merlijn Wajer <merlijn@...zup.org>,
        Adam Ford <aford173@...il.com>,
        Philipp Rossak <embed3d@...il.com>,
        Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Filip Matijević <filip.matijevic.pz@...il.com>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        moaz korena <moaz@...ena.xyz>,
        James Hilliard <james.hilliard1@...il.com>,
        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>,
        linux-omap <linux-omap@...r.kernel.org>
Subject: Re: Lay common foundation to make PVR/SGX work without hacks on OMAP34xx, OMAP36xx, AM335x and potentially OMAP4, OMAP5

Hi Tero,

> Am 07.10.2019 um 21:18 schrieb Tero Kristo <t-kristo@...com>:
> 
> On 07/10/2019 18:52, Tony Lindgren wrote:
>> Hi,
>> * H. Nikolaus Schaller <hns@...delico.com> [191005 16:59]:
>> Please try with Tero's current github branch at github.com/t-kristo/linux-pm.git
>> 5.4-rc1-ipc from few days ago, the earlier versions had still issues.
> 
> Yeah, this one should be fixed now.

Ok! Will try asap.

> 
>>> * OMAP5 (Pyra): fails to enable the clocks (did work with the previous version)
>>> [  304.140363] clock-controller:clk:0000:0: failed to enable
>>> [  304.147388] PVR_K:(Error): EnableSGXClocks: pm_runtime_get_sync failed (16)
>> Hmm no idea what might be up with this one. Did some clkctrl clock
>> fixes maybe cause a regression here? Tero do you have any ideas?
> 
> So, this one I am not too sure, I haven't looked at omap5 graphics clocking. I don't think it has anything to do with reset handling though.
> 
> Is there some simple way to try this out on board; without PVR module that is?

Yes, I have also seen it when just running the commands in the original commit message [1]:

# echo on > $(find /sys -name control | grep \/5600)
# rwmem 0x5600fe00	# OCP Revision
0x5600fe00 = 0x40000000
# echo auto > $(find /sys -name control | grep \/5600)
# rwmem 0x5600fe10
# rwmem 0x56000024

But I have not yet tested with 5.4-rc2, just 5.4-rc1.

BR and thanks,
Nikolaus

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.4-rc2&id=394534cb07d8f89b6e621e8a1e6da23571725aef