From 973a5b06a096f1a9494ebe94c78d809459f4dc74 Mon Sep 17 00:00:00 2001 From: Kenneth Graunke Date: Tue, 13 Jan 2015 12:46:53 -0800 Subject: [PATCH] drm/i915: Ensure the HiZ RAW Stall Optimization is on for Cherryview. MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This is an important optimization for avoiding read-after-write (RAW) stalls in the HiZ buffer. Certain workloads would run very slowly with HiZ enabled, but run much faster with the "hiz=false" driconf option. With this patch, they run at full speed even with HiZ. Increases performance in OglVSInstancing by about 2.7x on Braswell. Signed-off-by: Kenneth Graunke Reviewed-by: Ville Syrjälä Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_ringbuffer.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 0df15a4ad47f..23020d67329b 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -846,6 +846,11 @@ static int chv_init_workarounds(struct intel_engine_cs *ring) HDC_FORCE_NON_COHERENT | HDC_DONOT_FETCH_MEM_WHEN_MASKED); + /* According to the CACHE_MODE_0 default value documentation, some + * CHV platforms disable this optimization by default. Turn it on. + */ + WA_CLR_BIT_MASKED(CACHE_MODE_0_GEN7, HIZ_RAW_STALL_OPT_DISABLE); + /* Improve HiZ throughput on CHV. */ WA_SET_BIT_MASKED(HIZ_CHICKEN, CHV_HZ_8X8_MODE_IN_1X); -- 2.34.1