Hello,
On 2015-11-24 05:32, Javier Martinez Canillas wrote:
Hello Krzysztof,
On 11/24/2015 12:50 AM, Krzysztof Kozlowski wrote:
On 23.11.2015 22:56, Javier Martinez Canillas wrote:
Hello Krzysztof,
On 11/10/2015 09:43 PM, Krzysztof Kozlowski wrote:
[snip]
BTW, do you know why we don't have EXYNOS_IOMMU enabled in defconfig?
Any reasons against?
It was explicitly disabled by commit 6562f3bd396a ("ARM: exynos_defconfig:
Disable IOMMU support") because Exynos IOMMU support was broken and caused
a BUG on boot, the discussion of the patch is [0].
Right, now I remember.
But I just tested booting a v4.4-rc2 kernel on an Exynos5800 Peach Pi with
Exynos IOMMU enabled and the machine boots, display is working and
/sys/kernel/iommu_grups/*/devices shows that the devices were correctly
attached to an IOMMU group so things seems to have been sorted out now.
So it seems that EXYNOS_IOMMU could be enabled again. It would be good to
give such a patch a spin at kernelci before posting IMHO though just to be
sure there are no issues remaining.
Yes for enabling. No for testing only on kernelci. Booting is not a
sufficient test in this case. I would expect testing also display - at
Sorry if I didn't explain myself clearly. I didn't mean that kernelci was
enough to test Exynos IOMMU support, what I said is that would be nice to
have some boot coverage besides the normal manual (or automated) display
testing that someone could do on available platforms as discussed over IRC.
least some frame buffer console on DP or HDMI (or whatever output could
be generated... Xorg/Wayland would be better of course). You need it
Yes, as I mentioned in the previous email, I tested display (with X) on an
Exynos5800 Peach Pi. I don't have a rootfs with wayland/weston handy but I
could prepare one tomorrow to give a try.
because display and camera (including complementary modules like JPEG,
MFC etc) are actually the only users of Exynos IOMMU in mainline.
Do you have some test cases for MFC? I know that Gstreamer has support
for it but I don't know what Gst pipelines I can use to test if all is
working correctly.
Please note that mainline driver for MFC doesn't work with IOMMU enabled
yet.
I plan to finish a patch for it when I find some free time.
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
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