[PATCH v8 1/2] drm/xe: Get GT clock to nanosecs

[Riana Tauro]

From: Aravind Iddamsetty <aravind.iddamsetty at linux.intel.com>

Helper to convert GT clock cycles to nanoseconds.

v2: Use DIV_ROUND_CLOSEST_ULL helper(Ashutosh)
v3: rename xe_gt_clock_interval_to_ns to xe_gt_clock_cycles_to_ns
v4: rebase

Reviewed-by: Tejas Upadhyay <tejas.upadhyay at intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty at linux.intel.com>
Signed-off-by: Riana Tauro <riana.tauro at intel.com>
---
 drivers/gpu/drm/xe/xe_gt_clock.c | 5 +++++
 drivers/gpu/drm/xe/xe_gt_clock.h | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_gt_clock.c b/drivers/gpu/drm/xe/xe_gt_clock.c
index 9ff2061133df..ba35bbc89114 100644
--- a/drivers/gpu/drm/xe/xe_gt_clock.c
+++ b/drivers/gpu/drm/xe/xe_gt_clock.c
@@ -79,3 +79,8 @@ int xe_gt_clock_init(struct xe_gt *gt)
 	gt->info.reference_clock = freq;
 	return 0;
 }
+
+u64 xe_gt_clock_cycles_to_ns(const struct xe_gt *gt, u64 count)
+{
+	return DIV_ROUND_CLOSEST_ULL(count * NSEC_PER_SEC, gt->info.reference_clock);
+}
diff --git a/drivers/gpu/drm/xe/xe_gt_clock.h b/drivers/gpu/drm/xe/xe_gt_clock.h
index 44fa0371b973..aa162722f859 100644
--- a/drivers/gpu/drm/xe/xe_gt_clock.h
+++ b/drivers/gpu/drm/xe/xe_gt_clock.h
@@ -11,5 +11,5 @@
 struct xe_gt;
 
 int xe_gt_clock_init(struct xe_gt *gt);
-
+u64 xe_gt_clock_cycles_to_ns(const struct xe_gt *gt, u64 count);
 #endif
-- 
2.40.0