[PATCH] gpu: host1x: fix compile error when IOMMU API is not available

[Stefan Agner]

In case the IOMMU API is not available compiling host1x fails with
the following error:
  In file included from drivers/gpu/host1x/hw/host1x06.c:27:
  drivers/gpu/host1x/hw/channel_hw.c: In function âhost1x_channel_set_streamidâ:
  drivers/gpu/host1x/hw/channel_hw.c:118:30: error: implicit declaration of function
    âdev_iommu_fwspec_getâ; did you mean âiommu_fwspec_freeâ?  [-Werror=implicit-function-declaration]
  struct iommu_fwspec *spec = dev_iommu_fwspec_get(channel->dev->parent);
                              ^~~~~~~~~~~~~~~~~~~~
                              iommu_fwspec_free

Fixes: de5469c21ff9 ("gpu: host1x: Program the channel stream ID")
Signed-off-by: Stefan Agner <stefan@xxxxxxxx>
---
 drivers/gpu/host1x/hw/channel_hw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/host1x/hw/channel_hw.c b/drivers/gpu/host1x/hw/channel_hw.c
index 27101c04a827..4030d64916f0 100644
--- a/drivers/gpu/host1x/hw/channel_hw.c
+++ b/drivers/gpu/host1x/hw/channel_hw.c
@@ -114,7 +114,7 @@ static inline void synchronize_syncpt_base(struct host1x_job *job)
 
 static void host1x_channel_set_streamid(struct host1x_channel *channel)
 {
-#if HOST1X_HW >= 6
+#if IS_ENABLED(CONFIG_IOMMU_API) &&  HOST1X_HW >= 6
 	struct iommu_fwspec *spec = dev_iommu_fwspec_get(channel->dev->parent);
 	u32 sid = spec ? spec->ids[0] & 0xffff : 0x7f;
 
-- 
2.21.0