Revert "gpu: nvgpu: Get coherency on gv100 + NVLINK working"

Also revert other changes related to IO coherence. This may be the
culprit in a recent dev-kernel lockdown.

Bug 2070609

Change-Id: Ida178aef161fadbc6db9512521ea51c702c1564b
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1665914
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Srikar Srimath Tirumala <srikars@nvidia.com>

1 files changed, 0 insertions, 8 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/module.c b/drivers/gpu/nvgpu/common/linux/module.c
index 741c86e7..b103fcea 100644
--- a/drivers/gpu/nvgpu/common/linux/module.c
+++ b/drivers/gpu/nvgpu/common/linux/module.c
@@ -20,7 +20,6 @@
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/of_platform.h>
-#include <linux/of_address.h>
 #include <linux/interrupt.h>
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>
@@ -1108,7 +1107,6 @@ static int gk20a_probe(struct platform_device *dev)
         struct gk20a *gk20a;
         int err;
         struct gk20a_platform *platform = NULL;
-        struct device_node *np;
 
         if (dev->dev.of_node) {
                 const struct of_device_id *match;
@@ -1149,12 +1147,6 @@ static int gk20a_probe(struct platform_device *dev)
         if (err)
                 goto return_err;
 
-        np = nvgpu_get_node(gk20a);
-        if (of_dma_is_coherent(np)) {
-                __nvgpu_set_enabled(gk20a, NVGPU_USE_COHERENT_SYSMEM, true);
-                __nvgpu_set_enabled(gk20a, NVGPU_SUPPORT_IO_COHERENCE, true);
-        }
-
         if (nvgpu_platform_is_simulation(gk20a))
                 __nvgpu_set_enabled(gk20a, NVGPU_IS_FMODEL, true);