Hi Geert,
On 2017-05-12 14:58:53 +0200, Niklas Söderlund wrote:
> Hi Geert,
>
> Thanks for testing.
>
> On 2017-05-12 14:47:53 +0200, Geert Uytterhoeven wrote:
> > Hi Niklas,
> >
> > On Fri, May 12, 2017 at 12:27 AM, Niklas Söderlund
> > <niklas.soderlund+renesas@xxxxxxxxxxxx> wrote:
> > > WoL is enabled in the suspend callback by setting MagicPacket detection
> > > and disabling all interrupts expect MagicPacket. In the resume path the
> > > driver needs to reset the hardware to rearm the WoL logic, this prevents
> > > the driver from simply restoring the registers and to take advantage of
> > > that ravb was not suspended to reduce resume time. To reset the
> > > hardware the driver closes the device, sets it in reset mode and reopens
> > > the device just like it would do in a normal suspend/resume scenario
> > > without WoL enabled, but it both closes and opens the device in the
> > > resume callback since the device needs to be reset for WoL to work.
> > >
> > > One quirk needed for WoL is that the module clock needs to be prevented
> > > from being switched off by Runtime PM. To keep the clock alive the
> > > suspend callback need to call clk_enable() directly to increase the
> > > usage count of the clock. Then when Runtime PM decreases the clock usage
> > > count it won't reach 0 and be switched off.
> > >
> > > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
> >
> > Thanks for your patch!
> >
> > Wake-on-LAN now works for me on Salvator-X (both H3 and M3).
> >
> > However, after a few cycles, Ethernet stopped working, because CMA ran out of
> > memory:
> >
> > cma: cma_alloc: alloc failed, req-size: 6 pages, ret: -4
> > dpm_run_callback(): ravb_resume+0x0/0x148 returns -12
> > PM: Device e6800000.ethernet failed to resume: error -12
> >
> > Are we still missing some ravb patches in net-next, or is this a different
> > issue?
>
> Interesting, I did a 100 loop test on H3 based on v4.11 without any
> issues. What are you using as a base for your test and I will test if I
> can reproduce it.
I re-ran my test based on renesas-drivers-2017-05-02-v4.11 using the
arm64 defconfig. And was not able to see this :-(
My TC is basically a expect script that do:
ethtool -s eth0 wol g
for (i = 0; i < 100; i++) {
echo s2idle > /sys/power/mem_sleep
echo mem > /sys/power/state
sleep 5
HOST: etherwake -i net0 2e:09:0a:00:83:90
WAIT_FOR_CONSOLE
}
I use the default DT and arm64 defconfig and no other modifications. I'm
testing on H3 ES1.x board. What can be the different for us?
>
> >
> > When using PSCI suspend/resume, and Wake-on-LAN cannot work due to
> > PSCI firmware issues, Ethernet fails to come up afterwards:
> >
> > ravb e6800000.ethernet eth0: failed to switch device to config mode
> > ravb e6800000.ethernet eth0: device will be stopped after h/w
> > processes are done.
> > ravb e6800000.ethernet eth0: failed to switch device to config mode
> > dpm_run_callback(): ravb_resume+0x0/0x148 returns -110
> > PM: Device e6800000.ethernet failed to resume: error -110
> >
> > Your resume routine cannot assume RAVB is in a sane mode, as it will
> > have been reset if PSCI suspend was used.
>
> Ouch, yes this is true thanks for reporting will look in to it.
>
> The problem is that in the resume handler if WoL is enabled it will try
> to close the device before reinitializing it from reset state. If WoL is
> not enabled the device will be closed at suspend time so no need to
> close it before restoring operation from reset in the resume handler.
I was not able to reproduce this fault neither :-( But here I see
something is wrong, nothing is outputted on the console if WoL is
enabled:
echo 0 > /sys/module/printk/parameters/console_suspend
i2cset -f -y 7 0x30 0x20 0x0F
<Flip SW23>
echo mem > /sys/power/state
<Flip SW23>
<System wakes up>
While:
ethtool -s eth0 wol g
echo 0 > /sys/module/printk/parameters/console_suspend
i2cset -f -y 7 0x30 0x20 0x0F
<Flip SW23>
echo mem > /sys/power/state
<Flip SW23>
<Nothing happens on the console, not even firmware info is printed>
Are you enabling anything else then console_suspend to be able to
capture output at this point? I'm using the same setup tag and config as
I described above.
>
> >
> > Gr{oetje,eeting}s,
> >
> > Geert
> >
> > --
> > Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
> >
> > In personal conversations with technical people, I call myself a hacker. But
> > when I'm talking to journalists I just say "programmer" or something like that.
> > -- Linus Torvalds
>
> --
> Regards,
> Niklas Söderlund
--
Regards,
Niklas Söderlund
