Would this power difference with the GPU also apply with the GC3000 in the i.MX6qp or the GC2000 in the i.MX6q?
On Thu, Jun 25, 2020 at 8:04 AM Guido Günther <agx@xxxxxxxxxxx> wrote:
Hi,
On Tue, Mar 03, 2020 at 12:55:04PM +0100, Lucas Stach wrote:
> On Mo, 2020-03-02 at 20:13 +0100, Guido Günther wrote:
> > At least GC7000 fails to enter runtime suspend for long periods of time since
> > the MC becomes busy again even when the FE is idle. The rest of the series
> > makes detecting similar issues easier to debug in the future by checking
> > all known bits in debugfs and also warning in the EBUSY case.
>
> Thanks, series applied to etnaviv/next.
>
> > Tested on GC7000 with a reduced runtime delay of 50ms. Patches are
> > against next-20200226.
>
> I've already wondered if 200ms is too long, 50ms sounds more
> reasonable. Do you have any numbers on the power draw on the i.MX8M
> with idle GPU, vs. being fully power gated?
The difference is at least 250mW. It makes a huge difference over here.
We hit
https://lore.kernel.org/dri-devel/20200614064601.7872-1-navid.emamdoost@xxxxxxxxx/
recently and you notice instantly when that happens when looking at the
SoC temperature.
Cheers,
-- Guido
>
> Regards,
> Lucas
>
> > Thanks to Lucas Stach for pointing me in the right direction.
> >
> > Guido Günther (5):
> > drm/etnaviv: Fix typo in comment
> > drm/etnaviv: Update idle bits
> > drm/etnaviv: Consider all kwnown idle bits in debugfs
> > drm/etnaviv: Ignore MC when checking runtime suspend idleness
> > drm/etnaviv: Warn when GPU doesn't idle fast enough
> >
> > drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 26 ++++++++++++++++++++++----
> > drivers/gpu/drm/etnaviv/state_hi.xml.h | 7 +++++++
> > 2 files changed, 29 insertions(+), 4 deletions(-)
> >
>
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