From c5ba5b24657e473b1c64b0a614b168a635a2c935 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Thu, 7 Sep 2017 19:45:20 +0100
Subject: [PATCH] drm/i915: Apply the GTT write flush for all !llc machines
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Git-commit: c5ba5b24657e473b1c64b0a614b168a635a2c935
Patch-mainline: v4.15-rc1
References: FATE#322643 bsc#1055900
We also see the delayed GTT write issue on i915g/i915gm, so let's
presume that it is a universal problem for all !llc machines, and that we
just haven't yet noticed on g33, gen4 and gen5 machines.
V2: Use a register that exists on all platforms
Testcase: igt/gem_mmap_gtt/coherency # i915gm
References: https://bugs.freedesktop.org/show_bug.cgi?id=102577
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrj채l채 <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170907184520.5032-1-chris@chris-wilson.co.uk
Reviewed-by: Ville Syrj채l채 <ville.syrjala@linux.intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/i915/i915_gem.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -694,10 +694,10 @@ flush_write_domain(struct drm_i915_gem_o
switch (obj->base.write_domain) {
case I915_GEM_DOMAIN_GTT:
- if (INTEL_GEN(dev_priv) >= 6 && !HAS_LLC(dev_priv)) {
+ if (!HAS_LLC(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));
+ POSTING_READ_FW(RING_HEAD(dev_priv->engine[RCS]->mmio_base));
spin_unlock_irq(&dev_priv->uncore.lock);
intel_runtime_pm_put(dev_priv);
}