23.04.2021 18:01, Guillaume Tucker пишет: > On 02/04/2021 15:40, Dmitry Osipenko wrote: >> 01.04.2021 11:55, Nicolin Chen пишет: >>> On Mon, Mar 29, 2021 at 02:32:56AM +0300, Dmitry Osipenko wrote: >>>> The previous commit fixes problem where display client was attaching too >>>> early to IOMMU during kernel boot in a multi-platform kernel configuration >>>> which enables CONFIG_ARM_DMA_USE_IOMMU=y. The workaround that helped to >>>> defer the IOMMU attachment for Nyan Big Chromebook isn't needed anymore, >>>> revert it. >>> >>> Sorry for the late reply. I have been busy with downstream tasks. >>> >>> I will give them a try by the end of the week. Yet, probably it'd >>> be better to include Guillaume also as he has the Nyan platform. >>> >> >> Indeed, thanks. Although, I'm pretty sure that it's the same issue which >> I reproduced on Nexus 7. >> >> Guillaume, could you please give a test to these patches on Nyan Big? >> There should be no EMEM errors in the kernel log with this patches. >> >> https://patchwork.ozlabs.org/project/linux-tegra/list/?series=236215 > > So sorry for the very late reply. I have tried the patches but > hit some issues on linux-next, it's not reaching a login prompt > with next-20210422. So I then tried with next-20210419 which > does boot but shows the IOMMU error: > > <6>[ 2.995341] tegra-dc 54200000.dc: Adding to iommu group 1 > <4>[ 3.001070] Failed to attached device 54200000.dc to IOMMU_mapping > > https://lava.collabora.co.uk/scheduler/job/3570052#L1120 > > The branch I'm using with the patches applied can be found here: > > https://gitlab.collabora.com/gtucker/linux/-/commits/next-20210419-nyan-big-drm-read/ > > Hope this helps, let me know if you need anything else to be > tested. Hello Guillaume, The current linux-next doesn't boot on all ARM (AFAIK), the older next-20210413 works. The above message should be unrelated to the boot problem. It should be okay to ignore that message as it should be harmless in yours case.
