Re: [PATCH v18 0/2] Add memory bandwidth management to NVIDIA Tegra DRM driver

From: Thierry Reding
Date: Mon Jun 21 2021 - 06:59:38 EST

On Mon, Jun 21, 2021 at 07:19:15AM +0300, Dmitry Osipenko wrote:
> 07.06.2021 01:40, Dmitry Osipenko пишет:
> > 01.06.2021 07:21, Dmitry Osipenko пишет:
> >> This series adds memory bandwidth management to the NVIDIA Tegra DRM driver,
> >> which is done using interconnect framework. It fixes display corruption that
> >> happens due to insufficient memory bandwidth.
> >>
> >> Changelog:
> >>
> >> v18: - Moved total peak bandwidth from CRTC state to plane state and removed
> >> dummy plane bandwidth state initialization from T186+ plane hub. This
> >> was suggested by Thierry Reding to v17.
> >>
> >> - I haven't done anything about the cursor's plane bandwidth which
> >> doesn't contribute to overlapping bandwidths for a small sized
> >> window because it works okay as-is.
> >
> > Thierry, will you take these patches for 5.14?
> >
> The display controller does _NOT_WORK_ properly without bandwidth
> management.

That's surprising. So either it has never worked before (which I think
I'd know) or something has caused this regression recently. In the
latter case we need to identify what that was and revert (or fix) it.

> Can we get this patch into 5.14? What is the problem?

There was not enough time to review and test this, so I didn't feel
comfortable picking it up so close to the -rc6 cut-off. I plan to pick
this up early in the v5.14 release cycle and target v5.15.


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