From 3148310792b64c1b79e8ce399afccad369d4b17a Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 8 Aug 2019 08:41:52 +0100 Subject: [PATCH] drm/i915: Drop the fudge warning on ring restart for ctg/elk Since we have already stopped the ring, cleared the ring, disabled the ring (and verifying the ring is clear), a later debug message that the ring is no longer clear serves no function. It appears it restarts anyway, and we verify that the ring started correctly afterwards. Signed-off-by: Chris Wilson Acked-by: Mika Kuoppala Link: https://patchwork.freedesktop.org/patch/msgid/20190808074207.18274-4-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/gt/intel_ringbuffer.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c index aa2f06b80961..78b4235f9c0f 100644 --- a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c @@ -644,6 +644,7 @@ static int xcs_resume(struct intel_engine_cs *engine) intel_uncore_forcewake_get(engine->uncore, FORCEWAKE_ALL); + /* WaClearRingBufHeadRegAtInit:ctg,elk */ if (!stop_ring(engine)) { /* G45 ring initialization often fails to reset head to zero */ DRM_DEBUG_DRIVER("%s head not reset to zero " @@ -675,19 +676,16 @@ static int xcs_resume(struct intel_engine_cs *engine) intel_engine_reset_breadcrumbs(engine); /* Enforce ordering by reading HEAD register back */ - ENGINE_READ(engine, RING_HEAD); + ENGINE_POSTING_READ(engine, RING_HEAD); - /* Initialize the ring. This must happen _after_ we've cleared the ring + /* + * Initialize the ring. This must happen _after_ we've cleared the ring * registers with the above sequence (the readback of the HEAD registers * also enforces ordering), otherwise the hw might lose the new ring - * register values. */ + * register values. + */ ENGINE_WRITE(engine, RING_START, i915_ggtt_offset(ring->vma)); - /* WaClearRingBufHeadRegAtInit:ctg,elk */ - if (ENGINE_READ(engine, RING_HEAD)) - DRM_DEBUG_DRIVER("%s initialization failed [head=%08x], fudging\n", - engine->name, ENGINE_READ(engine, RING_HEAD)); - /* Check that the ring offsets point within the ring! */ GEM_BUG_ON(!intel_ring_offset_valid(ring, ring->head)); GEM_BUG_ON(!intel_ring_offset_valid(ring, ring->tail));