[Letux-kernel] Lay common foundation to make PVR/SGX work without hacks on OMAP34xx, OMAP36xx, AM335x and potentially OMAP4, OMAP5

H. Nikolaus Schaller hns at goldelico.com
Tue Oct 8 22:15:57 CEST 2019

> Am 08.10.2019 um 10:00 schrieb Tero Kristo <t-kristo at ti.com>:
> On 07/10/2019 22:24, H. Nikolaus Schaller wrote:
>> Hi Tero,
>>> Am 07.10.2019 um 21:18 schrieb Tero Kristo <t-kristo at ti.com>:
>>> On 07/10/2019 18:52, Tony Lindgren wrote:
>>>> Hi,
>>>> * H. Nikolaus Schaller <hns at goldelico.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.
> Ok, there is a one liner DTS data fix for this issue, attached.

Yes, have tested and it fixes omap5. I have the 3D demo running again on the Pyra. Yay!

Together with the latest rstcrtl patches, am335x is now better.
No omap_reset_deassert: timedout waiting for gfx:0 any more.

But I can't access the sgx registers and get memory faults. Maybe
my script has a bug and is trying the wrong address. Have to check
with some distance...

I have also tested omap3630 and omap4460 and they are not worse,
but also not better. So I think the foundation for sgx clock and
reset is now ok.

BR and thanks,

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