[PATCH 17/17] drm/i915: Enable Lower Slice on Haswell GT3.

Rodrigo Vivi
2013-08-26T22:51:56Z

Full HSW GT3 power can only be achieved with all Execution Units turned on.
This patch enables all EUs present on HSW GT3 by enabling lower slice.

Credits-by: Yejun Guo <yejun.guo@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
---
drivers/gpu/drm/i915/i915_drv.h | 2 ++
drivers/gpu/drm/i915/i915_gem.c | 5 +++++
drivers/gpu/drm/i915/i915_reg.h | 5 +++++
3 files changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 7ac5ca5..e9b2f86 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1592,6 +1592,8 @@ struct drm_i915_file_private {
((dev)->pci_device & 0xFF00) == 0x0C00)
#define IS_ULT(dev) (IS_HASWELL(dev) && \
((dev)->pci_device & 0xFF00) == 0x0A00)
+#define IS_HSW_GT3(dev) (IS_HASWELL(dev) && \
+ ((dev)->pci_device & 0x00F0) == 0x0020)

/*
* The genX designation typically refers to the render engine, so render
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 50a70ee..1c72229 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4316,6 +4316,11 @@ i915_gem_init_hw(struct drm_device *dev)
if (dev_priv->ellc_size)
I915_WRITE(HSW_IDICR, I915_READ(HSW_IDICR) | IDIHASHMSK(0xf));

+ if (IS_HSW_GT3(dev))
+ I915_WRITE(MI_PREDICATE_RESULT_2, LOWER_SLICE_ENABLED);
+ else
+ I915_WRITE(MI_PREDICATE_RESULT_2, LOWER_SLICE_DISABLED);
+
if (HAS_PCH_NOP(dev)) {
u32 temp = I915_READ(GEN7_MSG_CTL);
temp &= ~(WAIT_FOR_PCH_FLR_ACK | WAIT_FOR_PCH_RESET_ACK);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 4c3cf22..e122b57 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -263,6 +263,11 @@
#define MI_SEMAPHORE_SYNC_VVE (1<<16) /* VECS wait for VCS (VEVSYNC) */
#define MI_SEMAPHORE_SYNC_RVE (2<<16) /* VECS wait for RCS (VERSYNC) */
#define MI_SEMAPHORE_SYNC_INVALID (3<<16)
+
+#define MI_PREDICATE_RESULT_2 (0x2214)
+#define LOWER_SLICE_ENABLED (1<<0)
+#define LOWER_SLICE_DISABLED (0<<0)
+
/*
* 3D instructions used by the kernel
*/
--
1.8.1.4