[PATCH 1/2] drm/xe/guc: Accumulate CT H2G retry sleep budget

[Shuicheng Lin <shuicheng.lin@intel.com>]

guc_ct_send_wait_for_retry() introduced sleep_total_ms as a
budget guard, but never incremented it. As a result, the
"about 1 second" bailout condition never triggers in the H2G
backpressure path.

Accumulate the delay returned by xe_sleep_exponential_ms() into
sleep_total_ms so the timeout logic works as intended.

Fixes: 943c4d0637cf ("drm/xe/guc: Limit sleep while waiting for H2G credits")
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
---
 drivers/gpu/drm/xe/xe_guc_ct.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c
index 8a45573f8812..1c37813d2ccd 100644
--- a/drivers/gpu/drm/xe/xe_guc_ct.c
+++ b/drivers/gpu/drm/xe/xe_guc_ct.c
@@ -1124,7 +1124,7 @@ static bool guc_ct_send_wait_for_retry(struct xe_guc_ct *ct, u32 len,
 						 h2g->info.size,
 						 h2g->info.space,
 						 len + GUC_CTB_HDR_LEN);
-		xe_sleep_exponential_ms(sleep_period_ms, 64);
+		*sleep_total_ms += xe_sleep_exponential_ms(sleep_period_ms, 64);
 	} else {
 		struct xe_device *xe = ct_to_xe(ct);
 		struct guc_ctb *g2h = &ct->ctbs.g2h;
-- 
2.50.1