[PATCH 1/3] drm/panthor: Fix runtime suspend sequence after OPP transition error

["Adrián Larumbe" <adrian.larumbe@collabora.com>]

In case an OPP transition to a suspension state fails during the runtime
PM suspend call, if the driver's subsystems were successfully resumed,
we should return -EAGAIN so that the device's runtime PM status remains
'active'.

If FW reload failed, then we should fall through, so that the PM core
can flag the device as having suffered a runtime error.

Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
---
 drivers/gpu/drm/panthor/panthor_device.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/panthor/panthor_device.c
index 4082c8f2951d..cedd3cbcb47d 100644
--- a/drivers/gpu/drm/panthor/panthor_device.c
+++ b/drivers/gpu/drm/panthor/panthor_device.c
@@ -528,8 +528,13 @@ int panthor_device_suspend(struct device *dev)
 		    drm_dev_enter(&ptdev->base, &cookie)) {
 			panthor_gpu_resume(ptdev);
 			panthor_mmu_resume(ptdev);
-			drm_WARN_ON(&ptdev->base, panthor_fw_resume(ptdev));
-			panthor_sched_resume(ptdev);
+			ret = panthor_fw_resume(ptdev);
+			if (!ret) {
+				panthor_sched_resume(ptdev);
+				ret = -EAGAIN;
+			} else {
+				drm_err(&ptdev->base, "FW resume failed at runtime suspend: %d\n", ret);
+			}
 			drm_dev_exit(cookie);
 		}
 
-- 
2.46.2