From: Arvind Yadav <arvind.yadav@xxxxxxx>
This patch adds 20 ms of busy-waiting delay after mapping the
usermode queue in MES HW. It was observed during the testing that
this delay is required for expected results.
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Shashank Sharma <shashank.sharma@xxxxxxx>
Signed-off-by: Arvind Yadav <arvind.yadav@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
index cbfe2608c040..a28ed8e98f7b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
@@ -24,6 +24,15 @@
#include "amdgpu.h"
#include "amdgpu_vm.h"
+static inline void userqueue_busy_wait(unsigned long ms)
+{
+ unsigned long start = jiffies;
+ unsigned long timeout = start + ms;
+ while(time_before(jiffies, timeout)) {
+
+ }
+}
+
static inline int
amdgpu_userqueue_index(struct amdgpu_userq_mgr *uq_mgr, struct amdgpu_usermode_queue *queue)
{
@@ -85,6 +94,7 @@ amdgpu_userqueue_map(struct amdgpu_userq_mgr *uq_mgr,
return r;
}
+ userqueue_busy_wait(20);
DRM_DEBUG_DRIVER("Queue %d mapped successfully\n", queue->queue_id);
return 0;
}
--
2.34.1
