[PATCH] Disable BROKEN MSM_IOMMU

[Rob Clark]

On Feb 24 2015 or thereabouts, Nicolas Chauvet wrote:
> MSM_IOMMU doesn't play nice in multi-platform kernel
> This is causing probe issue as it tries to register unconditionally
> 
> Specially experienced on tegra_drm where IOMMU support was enabled
> for tegra30 and later since 3.19. It has prevented the fallback
> to non-iommu in the tegra20 case.
> 
> This need additionals "workaround" patches for EXYNOS, OMAP and Rockchip.
> v2 for thoses patches are reported at:
> http://lists.linuxfoundation.org/pipermail/iommu/2015-February/012226.html
> 
> This config change and thoses additionals patches would need
> to be backported down to 3.19 fedora kernels


fwiw, there was a patch upstream to mark MSM_IOMMU as depends on
BROKEN.. not sure if that would be sufficient

(either way, I don't really mind, the current upstream msm-iommu is not
actually used by any driver, at least not until I get time to rename
qcom-iommu and rework it to fit the one-true-iommu-bindings..)

BR,
-R

> ---
>  config-armv7 |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/config-armv7 b/config-armv7
> index 7f76e38..4e62e3a 100644
> --- a/config-armv7
> +++ b/config-armv7
> @@ -356,7 +356,7 @@ CONFIG_PHY_QCOM_APQ8064_SATA=m
>  CONFIG_PHY_QCOM_IPQ806X_SATA=m
>  CONFIG_USB_DWC3_QCOM=m
>  CONFIG_CRYPTO_DEV_QCE=m
> -CONFIG_MSM_IOMMU=y
> +# CONFIG_MSM_IOMMU is not set
>  CONFIG_DRM_MSM=m
>  CONFIG_DRM_MSM_FBDEV=y
>  CONFIG_USB_EHCI_MSM=m
> -- 
> 1.7.2.1
>