drm/i915: hold forcewake around ring hw init
Empirical evidence suggests that we need to: On at least one ivb
machine when running the hangman i-g-t test, the rings don't properly
initialize properly - the RING_START registers seems to be stuck at
all zeros.
Holding forcewake around this register init sequences makes chip reset
reliable again. Note that this is not the first such issue:
commit f01db988ef6f6c70a6cc36ee71e4a98a68901229
Author: Sean Paul <seanpaul@chromium.org>
Date: Fri Mar 16 12:43:22 2012 -0400
drm/i915: Add wait_for in init_ring_common
added delay loops to make RING_START and RING_CTL initialization
reliable on the blt ring at boot-up. So I guess it won't hurt if we do
this unconditionally for all force_wake needing gpus.
To avoid copy&pasting of the HAS_FORCE_WAKE check I've added a new
intel_info bit for that.
v2: Fixup missing commas in static struct and properly handling the
error case in init_ring_common, both noticed by Jani Nikula.
Cc: stable@vger.kernel.org
Reported-and-tested-by: Yang Guang <guang.a.yang@intel.com>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=50522
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 238a521..9fe9ebe 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -233,6 +233,7 @@
.has_blt_ring = 1,
.has_llc = 1,
.has_pch_split = 1,
+ .has_force_wake = 1,
};
static const struct intel_device_info intel_sandybridge_m_info = {
@@ -243,6 +244,7 @@
.has_blt_ring = 1,
.has_llc = 1,
.has_pch_split = 1,
+ .has_force_wake = 1,
};
static const struct intel_device_info intel_ivybridge_d_info = {
@@ -252,6 +254,7 @@
.has_blt_ring = 1,
.has_llc = 1,
.has_pch_split = 1,
+ .has_force_wake = 1,
};
static const struct intel_device_info intel_ivybridge_m_info = {
@@ -262,6 +265,7 @@
.has_blt_ring = 1,
.has_llc = 1,
.has_pch_split = 1,
+ .has_force_wake = 1,
};
static const struct intel_device_info intel_valleyview_m_info = {
@@ -289,6 +293,7 @@
.has_blt_ring = 1,
.has_llc = 1,
.has_pch_split = 1,
+ .has_force_wake = 1,
};
static const struct intel_device_info intel_haswell_m_info = {
@@ -298,6 +303,7 @@
.has_blt_ring = 1,
.has_llc = 1,
.has_pch_split = 1,
+ .has_force_wake = 1,
};
static const struct pci_device_id pciidlist[] = { /* aka */
@@ -1139,10 +1145,9 @@
/* We give fast paths for the really cool registers */
#define NEEDS_FORCE_WAKE(dev_priv, reg) \
- (((dev_priv)->info->gen >= 6) && \
- ((reg) < 0x40000) && \
- ((reg) != FORCEWAKE)) && \
- (!IS_VALLEYVIEW((dev_priv)->dev))
+ ((HAS_FORCE_WAKE((dev_priv)->dev)) && \
+ ((reg) < 0x40000) && \
+ ((reg) != FORCEWAKE))
#define __i915_read(x, y) \
u##x i915_read##x(struct drm_i915_private *dev_priv, u32 reg) { \