[Intel-gfx] [PATCH] drm/i915: Fix DRM_I915_DEBUG IOMMU stuff

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

We need to select IOMMU_SUPPORT as well, otherwise we can be left
with:
 CONFIG_IOMMU_IOVA=m
 # CONFIG_IOMMU_SUPPORT is not set
 CONFIG_INTEL_IOMMU=y

which complains:
"WARNING: unmet direct dependencies detected for INTEL_IOMMU"

and fails to link:
ld: drivers/iommu/intel-iommu.o: in function `free_all_cpu_cached_iovas':
/home/vsyrjala/src/linux/build_skl/../drivers/iommu/intel-iommu.c:4466: undefined reference to `free_cpu_cached_iovas'
...

Or do we maybe want something like:
 select <iommu thing> if IOMMU_SUPPORT
instead?

Cc: Chris Wilson <chris at chris-wilson.co.uk>
Fixes: 02229acb3926 ("drm/i915: Force compilation with intel-iommu for CI validation")
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/Kconfig.debug | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/Kconfig.debug b/drivers/gpu/drm/i915/Kconfig.debug
index c5c00cad6ba1..d940280df6b9 100644
--- a/drivers/gpu/drm/i915/Kconfig.debug
+++ b/drivers/gpu/drm/i915/Kconfig.debug
@@ -22,6 +22,7 @@ config DRM_I915_DEBUG
         depends on DRM_I915
 	select PCI_MSI
 	select IOMMU_API
+	select IOMMU_SUPPORT
 	select IOMMU_IOVA
 	select NEED_DMA_MAP_STATE
 	select DMAR_TABLE
-- 
2.21.0