drm/i915: Restore relaxed padding (OCL_OOB_SUPPRES_ENABLE) for skl+

This bit was fliped on for "syncing dependencies between camera and
graphics". BSpec has no recollection why, and it is causing
unrecoverable GPU hangs with Vulkan compute workloads.

From BSpec, setting bit5 to 0 enables relaxed padding requirements for
buffers, 1D and 2D non-array, non-MSAA, non-mip-mapped linear surfaces;
and *must* be set to 0h on skl+ to ensure "Out of Bounds" case is
suppressed.

Reported-by: Jason Ekstrand <jason@jlekstrand.net>
Suggested-by: Jason Ekstrand <jason@jlekstrand.net>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110998
Fixes: 8424171e135c ("drm/i915/gen9: h/w w/a: syncing dependencies between camera and graphics")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Tested-by: denys.kostin@globallogic.com
Cc: Jason Ekstrand <jason@jlekstrand.net>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: <stable@vger.kernel.org> # v4.1+
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190904100707.7377-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 8639fcccdb4202d0268214a3a55ef7da122c3b83..243d3f77be13f10c7428c16d638d9032e77eb565 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -297,11 +297,6 @@ static void gen9_ctx_workarounds_init(struct intel_engine_cs *engine,
                          FLOW_CONTROL_ENABLE |
                          PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE);
 
-       /* Syncing dependencies between camera and graphics:skl,bxt,kbl */
-       if (!IS_COFFEELAKE(i915))
-               WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN3,
-                                 GEN9_DISABLE_OCL_OOB_SUPPRESS_LOGIC);
-
        /* WaEnableYV12BugFixInHalfSliceChicken7:skl,bxt,kbl,glk,cfl */
        /* WaEnableSamplerGPGPUPreemptionSupport:skl,bxt,kbl,cfl */
        WA_SET_BIT_MASKED(GEN9_HALF_SLICE_CHICKEN7,