On 05/20/15 16:31, Javier Martinez Canillas wrote:
Hello Marek,
On Tue, May 19, 2015 at 3:20 PM, Marek Szyprowski m.szyprowski@samsung.com wrote:
Hello Everyone,
This is yet another attempt to get Exynos SYSMMU driver with integrated with IOMMU & DMA-mapping subsystems. This version includes minor fixes suggested by Joerg Roedel, Cho KyongHo and Robin Murphy.
All patches are also available in the following git repository: https://git.linaro.org/people/marek.szyprowski/linux-srpol.git branch v4.1-exynos-iommu-v7.
My plan for merging this patchset is as follows:
- DTS changes and power domain changes should go via Samsung tree to avoid conflicts with other pending DTS patches
- all exynos-iommu patches and dma-mapping/reserved iommu region should go via IOMMU tree,
- all Exynos DRM patches should go via DRM/Exynos tree.
There are no build cross-subsystem dependencies and IOMMU on Exynos is already nonfunctional (and disabled in defconfig), so merging patches in parts doesn't break anything.
There are knowns issues with Exynos DRM driver and IOMMU support (i.e. Xorg freeze reported by Javier Martinez Canillas: http://www.spinics.net/lists/linux-samsung-soc/msg44350.html ). They will be handled by a separate fixes to Exynos DRM drivers. This patchset fixes only those issues in Exynos DRM FIMD driver, which prevents booting to console.
I tested your v7 using exynos_defconfig + CONFIG_EXYNOS_IOMMU on both Exynos5250 Snow and Exynos5420 Peach Pit Chromebooks.
I can only reproduce the complete system hang on Xorg if I use the xf86-video-armsoc DDX. If I use the -fbdev DDX instead, X starts correctly and the system does not freeze. Also, this only happens on Exynos5420 Peach Pit, Exynos5250 Snow is working correctly even when using the -armsoc DDX.
So as you said, this is a separate issue with the Exynos DRM driver IOMMU support and is not related to your series. For the whole series:
Tested-by: Javier Martinez Canillas javier.martinez@collabora.co.uk
Thanks for your test on the boards.
I'll sort out the arch/ side changes into samsung tree in this weekend.
- Kukjin