Re: [PATCH v2 2/2] drm/omap: partial workaround for DRA7xx DMM errata i878

On 04/04/18 00:11, Laurent Pinchart wrote:

I assume access to DMM-mapped buffers to be way more frequent than access to the DMM registers. If that's the case, this partial workaround should only slightly lower the probability of system lock-up. Do you have plans to implement a workaround that will fix the problem completely ?

CPU only accesses memory via DMM when using TILER 2D buffers, which are not officially supported. For non-2D, the pages are mapped directly to the CPU without DMM in between.

Tomi