On 2019-11-01 22:55, Will Deacon wrote:
On Fri, Nov 01, 2019 at 10:49:00PM +0530, Sai Prakash Ranjan wrote:
On 2019-11-01 22:01, Will Deacon wrote:
> On Fri, Sep 20, 2019 at 01:34:26PM +0530, Sai Prakash Ranjan wrote:
> > Previous version of the patches are at [1]:
> >
> > QCOM's implementation of smmu-500 on sdm845 adds a hardware logic
> > called
> > wait-for-safe. This logic helps in meeting the invalidation
> > requirements
> > from 'real-time clients', such as display and camera. This
> > wait-for-safe
> > logic ensures that the invalidations happen after getting an ack
> > from these
> > devices.
> > In this patch-series we are disabling this wait-for-safe logic from
> > the
> > arm-smmu driver's probe as with this enabled the hardware tries to
> > throttle invalidations from 'non-real-time clients', such as USB and
> > UFS.
> >
> > For detailed information please refer to patch [3/4] in this series.
> > I have included the device tree patch too in this series for someone
> > who
> > would like to test out this. Here's a branch [2] that gets display
> > on MTP
> > SDM845 device.
> >
> > This patch series is inspired from downstream work to handle
> > under-performance
> > issues on real-time clients on sdm845. In downstream we add separate
> > page table
> > ops to handle TLB maintenance and toggle wait-for-safe in tlb_sync
> > call so that
> > achieve required performance for display and camera [3, 4].
>
> What's the plan for getting this merged? I'm not happy taking the
> firmware
> bits without Andy's ack, but I also think the SMMU changes should go via
> the IOMMU tree to avoid conflicts.
>
> Andy?
>
Bjorn maintains QCOM stuff now if I am not wrong and he has already
reviewed
the firmware bits. So I'm hoping you could take all these through
IOMMU
tree.
Oh, I didn't realise that. Is there a MAINTAINERS update someplace? If
I
run:
$ ./scripts/get_maintainer.pl -f drivers/firmware/qcom_scm-64.c
in linux-next, I get:
Andy Gross <agross@xxxxxxxxxx> (maintainer:ARM/QUALCOMM SUPPORT)
linux-arm-msm@xxxxxxxxxxxxxxx (open list:ARM/QUALCOMM SUPPORT)
linux-kernel@xxxxxxxxxxxxxxx (open list)
It hasn't been updated yet then. I will leave it to Bjorn or Andy to
comment on this.
-Sai
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