[PATCH 1/2] drm/i915/gt: Ensure that all new contexts clear STOP_RING

[Chris Wilson]

Set up the RING_MI_NODE in new contexts to clear the STOP_RING bit, just
in case they find it still set after a reset (as they are the first
contexts to be run).

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_lrc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 4fb70a7716e3..db6987fb8dd4 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -4029,6 +4029,7 @@ static void execlists_init_reg_state(u32 *regs,
 	 * Must keep consistent with virtual_update_register_offsets().
 	 */
 	u32 *bbe = set_offsets(regs, reg_offsets(engine), engine);
+	int x;
 
 	if (close) { /* Close the batch; used mainly by live_lrc_layout() */
 		*bbe = MI_BATCH_BUFFER_END;
@@ -4043,6 +4044,10 @@ static void execlists_init_reg_state(u32 *regs,
 			     INTEL_GEN(engine->i915) >= 12 ?
 			     GEN12_CTX_BB_PER_CTX_PTR :
 			     CTX_BB_PER_CTX_PTR);
+
+	x = lrc_ring_mi_mode(engine);
+	if (x != -1)
+		regs[x + 1] = _MASKED_BIT_DISABLE(STOP_RING);
 }
 
 static int
-- 
2.25.0.rc0