From 0168bdfc9c53a27a81bbe6c061dc118c1dd95a36 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Tue, 29 Aug 2017 20:25:46 +0100
Subject: [PATCH] drm/i915: Always wake the device to flush the GTT
Git-commit: 0168bdfc9c53a27a81bbe6c061dc118c1dd95a36
Patch-mainline: v4.14-rc1
References: FATE#322643 bsc#1055900
No-fix: b69a784f5e2308d6360a76eceae450e96751f3e4
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: e2a2aa36a509 ("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 b69a784f5e2308d6360a76eceae450e96751f3e4)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/i915/i915_gem.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -695,12 +695,11 @@ 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 (intel_runtime_pm_get_if_in_use(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_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,