[PATCH v4 2/7] drm/xe: Add xe_gt_clock_interval_to_ms helper

[Matthew Brost <matthew.brost@intel.com>]

Add helper to convert GT clock ticks to msec. Useful for determining if
timeouts occur by examing GT clock ticks.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/xe/xe_gt_clock.c | 18 ++++++++++++++++++
 drivers/gpu/drm/xe/xe_gt_clock.h |  1 +
 2 files changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_gt_clock.c b/drivers/gpu/drm/xe/xe_gt_clock.c
index 9ff2061133df..a9392a743fd5 100644
--- a/drivers/gpu/drm/xe/xe_gt_clock.c
+++ b/drivers/gpu/drm/xe/xe_gt_clock.c
@@ -79,3 +79,21 @@ int xe_gt_clock_init(struct xe_gt *gt)
 	gt->info.reference_clock = freq;
 	return 0;
 }
+
+static u64 div_u64_roundup(u64 nom, u32 den)
+{
+	return div_u64(nom + den - 1, den);
+}
+
+/**
+ * xe_gt_clock_interval_to_ms - Convert sampled GT clock ticks to msec
+ *
+ * @gt: the &xe_gt
+ * @count: count of GT clock ticks
+ *
+ * Returns: time in msec
+ */
+u64 xe_gt_clock_interval_to_ms(struct xe_gt *gt, u64 count)
+{
+	return div_u64_roundup(count * MSEC_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..3adeb7baaca4 100644
--- a/drivers/gpu/drm/xe/xe_gt_clock.h
+++ b/drivers/gpu/drm/xe/xe_gt_clock.h
@@ -11,5 +11,6 @@
 struct xe_gt;
 
 int xe_gt_clock_init(struct xe_gt *gt);
+u64 xe_gt_clock_interval_to_ms(struct xe_gt *gt, u64 count);
 
 #endif
-- 
2.34.1