Flush; invalidate; change registers; invalidate; flush.
Will this finally work on every device? Or will Baytrail complain again?
On the positive side, we immediate see the benefit of having hsw-gt1 in
CU.
Fixes: ace44e13e577 ("drm/i915/gt: Clear CACHE_MODE prior to clearing residuals")
Testcase: igt/gem_render_tiled_blits # hsw-gt1
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Cc: Akeem G Abodunrin <akeem.g.abodunrin@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/gen7_renderclear.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/i915/gt/gen7_renderclear.c b/drivers/gpu/drm/i915/gt/gen7_renderclear.c
index 8551e6de50e8..e403eb046a43 100644
--- a/drivers/gpu/drm/i915/gt/gen7_renderclear.c
+++ b/drivers/gpu/drm/i915/gt/gen7_renderclear.c
@@ -393,6 +393,7 @@ static void emit_batch(struct i915_vma * const vma,
desc_count);
/* Reset inherited context registers */
+ gen7_emit_pipeline_flush(&cmds);
gen7_emit_pipeline_invalidate(&cmds);
batch_add(&cmds, MI_LOAD_REGISTER_IMM(2));
batch_add(&cmds, i915_mmio_reg_offset(CACHE_MODE_0_GEN7));
--
2.20.1
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