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drm/i915: Always wake the device to flush the GTT 

Since we hold the device wakeref when writing through the GTT (otherwise
the writes would fail), we presumed that before the device sleeps those
writes would naturally be flushed and that we wouldn't need our mmio
read trick. However, that presumption seems false and a sleepy bxt seems
to require us to always manually flush the GTT writes prior to direct
access.

Fixes: e2a2aa36a5 ("drm/i915: Check we have an wake device before flushing GTT writes")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170829192546.1087-1-chris@chris-wilson.co.uk
(cherry picked from commit b69a784f5e)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Chris Wilson 2017-08-29 20:25:46 +01:00 committed by Rodrigo Vivi
parent 3b24e7e810
commit 0168bdfc9c
1 changed files with 5 additions and 6 deletions
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3
drivers/gpu/drm/i915/i915_gem.c
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@ -695,13 +695,12 @@ flush_write_domain(struct drm_i915_gem_object *obj, unsigned int flush_domains)
switch (obj->base.write_domain) {
case I915_GEM_DOMAIN_GTT:
if (INTEL_GEN(dev_priv) >= 6 && !HAS_LLC(dev_priv)) {
if (intel_runtime_pm_get_if_in_use(dev_priv)) {
intel_runtime_pm_get(dev_priv);
spin_lock_irq(&dev_priv->uncore.lock);
POSTING_READ_FW(RING_ACTHD(dev_priv->engine[RCS]->mmio_base));
spin_unlock_irq(&dev_priv->uncore.lock);
intel_runtime_pm_put(dev_priv);
}
}
intel_fb_obj_flush(obj,
fb_write_origin(obj, I915_GEM_DOMAIN_GTT));