[PATCH] drm/xe/guc_submit: Simplify and fix diff calculation

[Lucas De Marchi]

With a u32 type, there's no need to check which one is greater: the
current is always the latest and if it's less than the previous, it's
because it wrapped: just do the unsigned calculation that will lead to
the same result, or better the correct one. It fixes an off-by-one in
the wrapped calculation, however that doesn't really matter for the
timeout calculation.

Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 drivers/gpu/drm/xe/xe_guc_submit.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_guc_submit.c b/drivers/gpu/drm/xe/xe_guc_submit.c
index fb125f940de8f..80f748baad3f3 100644
--- a/drivers/gpu/drm/xe/xe_guc_submit.c
+++ b/drivers/gpu/drm/xe/xe_guc_submit.c
@@ -976,10 +976,7 @@ static bool check_timeout(struct xe_exec_queue *q, struct xe_sched_job *job)
 	 */
 	xe_gt_assert(gt, timeout_ms < 100 * MSEC_PER_SEC);
 
-	if (ctx_timestamp < ctx_job_timestamp)
-		diff = ctx_timestamp + U32_MAX - ctx_job_timestamp;
-	else
-		diff = ctx_timestamp - ctx_job_timestamp;
+	diff = ctx_timestamp - ctx_job_timestamp;
 
 	/*
 	 * Ensure timeout is within 5% to account for an GuC scheduling latency