From b7884eb45ec98c0d34c7f49005ae9d4b4b4e38f6 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Mon, 4 Jun 2012 11:18:15 +0200 Subject: [PATCH] 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 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 Reviewed-by: Eugeni Dodonov Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=50522 Signed-Off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_drv.c | 13 +++++++++---- drivers/gpu/drm/i915/i915_drv.h | 3 +++ drivers/gpu/drm/i915/intel_ringbuffer.c | 16 +++++++++++++--- 3 files changed, 25 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 238a52165833..9fe9ebe52a7a 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -233,6 +233,7 @@ static const struct intel_device_info intel_sandybridge_d_info = { .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 @@ static const struct intel_device_info intel_sandybridge_m_info = { .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 @@ static const struct intel_device_info intel_ivybridge_d_info = { .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 @@ static const struct intel_device_info intel_ivybridge_m_info = { .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 @@ static const struct intel_device_info intel_haswell_d_info = { .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 @@ static const struct intel_device_info intel_haswell_m_info = { .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 @@ MODULE_LICENSE("GPL and additional rights"); /* 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) { \ diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 377c21f531e4..cff630757650 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -285,6 +285,7 @@ struct intel_device_info { u8 is_ivybridge:1; u8 is_valleyview:1; u8 has_pch_split:1; + u8 has_force_wake:1; u8 is_haswell:1; u8 has_fbc:1; u8 has_pipe_cxsr:1; @@ -1098,6 +1099,8 @@ struct drm_i915_file_private { #define HAS_PCH_CPT(dev) (INTEL_PCH_TYPE(dev) == PCH_CPT) #define HAS_PCH_IBX(dev) (INTEL_PCH_TYPE(dev) == PCH_IBX) +#define HAS_FORCE_WAKE(dev) (INTEL_INFO(dev)->has_force_wake) + #include "i915_trace.h" /** diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 9fbad086cb4b..e5b84ff89ca5 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -266,10 +266,15 @@ u32 intel_ring_get_active_head(struct intel_ring_buffer *ring) static int init_ring_common(struct intel_ring_buffer *ring) { - drm_i915_private_t *dev_priv = ring->dev->dev_private; + struct drm_device *dev = ring->dev; + drm_i915_private_t *dev_priv = dev->dev_private; struct drm_i915_gem_object *obj = ring->obj; + int ret = 0; u32 head; + if (HAS_FORCE_WAKE(dev)) + gen6_gt_force_wake_get(dev_priv); + /* Stop the ring if it's running. */ I915_WRITE_CTL(ring, 0); I915_WRITE_HEAD(ring, 0); @@ -317,7 +322,8 @@ static int init_ring_common(struct intel_ring_buffer *ring) I915_READ_HEAD(ring), I915_READ_TAIL(ring), I915_READ_START(ring)); - return -EIO; + ret = -EIO; + goto out; } if (!drm_core_check_feature(ring->dev, DRIVER_MODESET)) @@ -329,7 +335,11 @@ static int init_ring_common(struct intel_ring_buffer *ring) ring->last_retired_head = -1; } - return 0; +out: + if (HAS_FORCE_WAKE(dev)) + gen6_gt_force_wake_put(dev_priv); + + return ret; } static int -- 2.30.2