On Mon, Jun 21, 2021 at 07:19:15AM +0300, Dmitry Osipenko wrote:

07.06.2021 01:40, Dmitry Osipenko пишет:

quoted

01.06.2021 07:21, Dmitry Osipenko пишет:

quoted

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.

Thierry