On 5/26/2020 11:34 PM, John Stultz wrote: > On Thu, May 14, 2020 at 12:34 PM <bjorn.anders...@linaro.org> wrote: >> >> On Thu 27 Feb 18:57 PST 2020, Bjorn Andersson wrote: >> >> Rob, Will, we're reaching the point where upstream has enough >> functionality that this is becoming a critical issue for us. >> >> E.g. Lenovo Yoga C630 is lacking this and a single dts patch to boot >> mainline with display, GPU, WiFi and audio working and the story is >> similar on several devboards. >> >> As previously described, the only thing I want is the stream mapping >> related to the display controller in place, either with the CB with >> translation disabled or possibly with a way to specify the framebuffer >> region (although this turns out to mess things up in the display >> driver...) >> >> I did pick this up again recently and concluded that by omitting the >> streams for the USB controllers causes an instability issue seen on one >> of the controller to disappear. So I would prefer if we somehow could >> have a mechanism to only pick the display streams and the context >> allocation for this. >> >> >> Can you please share some pointers/insights/wishes for how we can >> conclude on this subject? > > Ping? I just wanted to follow up on this discussion as this small > series is crucial for booting mainline on the Dragonboard 845c > devboard. It would be really valuable to be able to get some solution > upstream so we can test mainline w/o adding additional patches.
+1 There are also some NXP chips that depend on this. Also, I've submitted a v2 [1] a while back that tries to address the feedback on the initial implementation. [1] https://patchwork.ozlabs.org/project/linux-tegra/list/?series=164853 --- Best Regards, Laurentiu _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
