[PATCH 1/2] drm/xe/gsc: Turn off GSCCS interrupts when disabling the engine

[Daniele Ceraolo Spurio]

Starting on LNL, there is a new GSCCS interrupt that is triggered when
the GSC engine reset fails. If the HW is in a bad state, this interrupt
might end up being triggered even if we're not using the engine, which
will lead to a warning because we'll see it as unexpected. Since there
is no point in handling the interrupt in this scenario, we can just
make sure the interrupts are off when we disable the engine.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/xe/xe_hw_engine.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_hw_engine.c b/drivers/gpu/drm/xe/xe_hw_engine.c
index a688bb2d96ce..b9c5690c4d96 100644
--- a/drivers/gpu/drm/xe/xe_hw_engine.c
+++ b/drivers/gpu/drm/xe/xe_hw_engine.c
@@ -720,6 +720,11 @@ static void check_gsc_availability(struct xe_gt *gt)
 	 */
 	if (!xe_uc_fw_is_available(&gt->uc.gsc.fw)) {
 		gt->info.engine_mask &= ~BIT(XE_HW_ENGINE_GSCCS0);
+
+		/* interrupts where previously enabled, so turn them off */
+		xe_mmio_write32(gt, GUNIT_GSC_INTR_ENABLE, 0);
+		xe_mmio_write32(gt, GUNIT_GSC_INTR_MASK, ~0);
+
 		drm_info(&xe->drm, "gsccs disabled due to lack of FW\n");
 	}
 }
-- 
2.43.0