gpu: nvgpu: Falcon controller wait for halt

- Added nvgpu_flcn_wait_for_halt() interface to wait for
falcon halt, which block till falcon halt or timeout
expire for selected falcon controller

- Replaced falcon wait for halt code with method
nvgpu_flcn_wait_for_halt()

NVGPU JIRA-99

Change-Id: Ie1809dc29ff65bddc7ef2859a9ee9b4f0003b127
Signed-off-by: Mahantesh Kumbar <mkumbar@nvidia.com>
Reviewed-on: https://git-master/r/1510201
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/falcon/falcon.c b/drivers/gpu/nvgpu/common/falcon/falcon.c
index b6589bd1..ba2fb3fe 100644
--- a/drivers/gpu/nvgpu/common/falcon/falcon.c
+++ b/drivers/gpu/nvgpu/common/falcon/falcon.c
@@ -102,6 +102,26 @@ bool nvgpu_flcn_get_cpu_halted_status(struct nvgpu_falcon *flcn)
         return status;
 }
 
+int nvgpu_flcn_wait_for_halt(struct nvgpu_falcon *flcn, unsigned int timeout)
+{
+        struct gk20a *g = flcn->g;
+        struct nvgpu_timeout to;
+        int status = 0;
+
+        nvgpu_timeout_init(g, &to, timeout, NVGPU_TIMER_CPU_TIMER);
+        do {
+                if (nvgpu_flcn_get_cpu_halted_status(flcn))
+                        break;
+
+                nvgpu_udelay(10);
+        } while (!nvgpu_timeout_expired(&to));
+
+        if (nvgpu_timeout_peek_expired(&to))
+                status = -EBUSY;
+
+        return status;
+}
+
 bool nvgpu_flcn_get_idle_status(struct nvgpu_falcon *flcn)
 {
         struct nvgpu_falcon_ops *flcn_ops = &flcn->flcn_ops;