[GIT PULL 2/2] Samsung fixes-2 for v4.0

Javier Martinez Canillas javier at dowhile0.org
Sat Mar 14 06:17:50 PDT 2015

Hello Kukjin,

On Fri, Mar 6, 2015 at 10:43 AM, Kukjin Kim <kgene at kernel.org> wrote:
>> Yes, the problem is the Exynos DRM driver which has a lot of issues.
>> It's broken if CONFIG_DRM_EXYNOS_IOMMU is enabled which defaults to
>> yes after commit 8dcc14f82f06 ("drm/exynos: IOMMU support should not
>> be selectable by user").
>> I posted a patch to disable IOMMU support on Exynos to avoid these
>> boot failures and also mentioned to Kukjin that it should be a fix for
>> 4.0 [0]. But even with IOMMU disabled, the Exynos DRM is broken in
>> some boards [1] so we may have to disable that driver until everything
>> gets sorted out and is stable again.
> Yes, the fix is in my tree and it will be sent to upstream via arm-soc soon.

Sorry for pestering you but I see that the patch to disable
EXYNOS_IOMMU is still not in Linus' master and we are almost in
4.0-rc4 now.

A patch to the Exynos DRM driver to check for IOMMU and fail
gracefully has landed in 4.0-rc so now at least the machines boot but
with IOMMU enabled display is broken in the Exynos5 boards.

> Thanks,
> Kukjin

Best regards,

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