Chris Wilson 11988e3938 drm/i915/execlists: Try rearranging breadcrumb flush
The addition of the DC_FLUSH failed to ensure sanctity of the post-sync
write as CI immediately got a completion CS-event before the breadcrumb
was coherent. So let's try the other idea of moving the post-sync write
into the CS_STALL.

References: https://bugs.freedesktop.org/show_bug.cgi?id=111514
References: e8f6b4952ec5 ("drm/i915/execlists: Flush the post-sync breadcrumb write harder")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Acked-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190829081150.10271-2-chris@chris-wilson.co.uk
2019-08-29 23:47:36 +01:00
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