[PATCH 13/21] drm/i915: add RPS configuration for Haswell

Eugeni Dodonov
2012-06-28T18:54:38Z

Split Haswell-specific GT algorithms into its own function.

Note that Haswell only has RC6, so account for that as well.

Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_pm.c | 160 ++++++++++++++++++++++++++++++++++++++--
2 files changed, 155 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 2c4be2e..0c53e4a 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4131,6 +4131,7 @@
#define GEN6_RP_UP_IDLE_MIN (0x1<<3)
#define GEN6_RP_UP_BUSY_AVG (0x2<<3)
#define GEN6_RP_UP_BUSY_CONT (0x4<<3)
+#define GEN7_RP_DOWN_IDLE_AVG (0x2<<0)
#define GEN6_RP_DOWN_IDLE_CONT (0x1<<0)
#define GEN6_RP_UP_THRESHOLD 0xA02C
#define GEN6_RP_DOWN_THRESHOLD 0xA030
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 0334e42..0733f16 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2301,6 +2301,26 @@ void gen6_set_rps(struct drm_device *dev, u8 val)
dev_priv->cur_delay = val;
}

+static void hsw_disable_rps(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ I915_WRITE(GEN6_RC_CONTROL, 0);
+ I915_WRITE(GEN6_RPNSWREQ, 1 << 31);
+ I915_WRITE(GEN6_PMINTRMSK, 0xffffffff);
+ I915_WRITE(GEN6_PMIER, 0);
+ /* Complete PM interrupt masking here doesn't race with the rps work
+ * item again unmasking PM interrupts because that is using a different
+ * register (PMIMR) to mask PM interrupts. The only risk is in leaving
+ * stale bits in PMIIR and PMIMR which gen6_enable_rps will clean up. */
+
+ spin_lock_irq(&dev_priv->rps_lock);
+ dev_priv->pm_iir = 0;
+ spin_unlock_irq(&dev_priv->rps_lock);
+
+ I915_WRITE(GEN6_PMIIR, I915_READ(GEN6_PMIIR));
+}
+
static void gen6_disable_rps(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -2334,9 +2354,10 @@ int intel_enable_rc6(const struct drm_device *dev)
if (INTEL_INFO(dev)->gen == 5)
return 0;

- /* Sorry Haswell, no RC6 for you for now. */
+ /* Haswell does not has RC6p nor RC6pp
+ */
if (IS_HASWELL(dev))
- return 0;
+ return INTEL_RC6_ENABLE;

/*
* Disable rc6 on Sandybridge
@@ -2349,6 +2370,130 @@ int intel_enable_rc6(const struct drm_device *dev)
return (INTEL_RC6_ENABLE | INTEL_RC6p_ENABLE);
}

+static void hsw_enable_rps(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct intel_ring_buffer *ring;
+ u32 pcu_mbox, rc6_mask = 0;
+ int rc6_mode;
+ int i;
+
+ WARN_ON(!mutex_is_locked(&dev->struct_mutex));
+
+ /* Here begins a magic sequence of register writes to enable
+ * auto-downclocking.
+ *
+ * Perhaps there might be some value in exposing these to
+ * userspace...
+ */
+ I915_WRITE(GEN6_RC_STATE, 0);
+
+ gen6_gt_force_wake_get(dev_priv);
+
+ /* In units of 100MHz */
+ dev_priv->max_delay = 18;
+ dev_priv->min_delay = 6;
+ dev_priv->cur_delay = 0;
+
+ /* disable the counters and set deterministic thresholds */
+ I915_WRITE(GEN6_RC_CONTROL, 0);
+
+ I915_WRITE(GEN6_RC1_WAKE_RATE_LIMIT, 1000 << 16);
+ I915_WRITE(GEN6_RC6_WAKE_RATE_LIMIT, 40 << 16);
+ I915_WRITE(GEN6_RC_EVALUATION_INTERVAL, 125000);
+ I915_WRITE(GEN6_RC_IDLE_HYSTERSIS, 25);
+
+ for_each_ring(ring, dev_priv, i)
+ I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);
+
+ I915_WRITE(GEN6_RC_SLEEP, 0);
+ I915_WRITE(GEN6_RC1e_THRESHOLD, 1000);
+ I915_WRITE(GEN6_RC6_THRESHOLD, 50000);
+
+ rc6_mode = intel_enable_rc6(dev_priv->dev);
+
+ if (rc6_mode & INTEL_RC6_ENABLE)
+ rc6_mask |= GEN6_RC_CTL_RC6_ENABLE;
+
+ DRM_INFO("Enabling RC6 states on Haswell: RC6 %s\n",
+ (rc6_mode & INTEL_RC6_ENABLE) ? "on" : "off");
+
+ I915_WRITE(GEN6_RC_CONTROL,
+ rc6_mask |
+ GEN6_RC_CTL_EI_MODE(1) |
+ GEN6_RC_CTL_HW_ENABLE);
+
+ I915_WRITE(GEN6_RPNSWREQ,
+ GEN6_FREQUENCY(10) |
+ GEN6_OFFSET(0) |
+ GEN6_AGGRESSIVE_TURBO);
+ I915_WRITE(GEN6_RC_VIDEO_FREQ,
+ GEN6_FREQUENCY(12));
+
+ I915_WRITE(GEN6_RP_DOWN_TIMEOUT, 1000000);
+ I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
+ dev_priv->max_delay << 24 |
+ dev_priv->min_delay << 16);
+ I915_WRITE(GEN6_RP_UP_THRESHOLD, 59400);
+ I915_WRITE(GEN6_RP_DOWN_THRESHOLD, 245000);
+ I915_WRITE(GEN6_RP_UP_EI, 66000);
+ I915_WRITE(GEN6_RP_DOWN_EI, 350000);
+ I915_WRITE(GEN6_RP_IDLE_HYSTERSIS, 10);
+ I915_WRITE(GEN6_RP_CONTROL,
+ GEN6_RP_MEDIA_TURBO |
+ GEN6_RP_MEDIA_HW_MODE |
+ GEN6_RP_MEDIA_IS_GFX |
+ GEN6_RP_ENABLE |
+ GEN6_RP_UP_BUSY_AVG |
+ GEN7_RP_DOWN_IDLE_AVG);
+
+ if (wait_for((I915_READ(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) == 0,
+ 500))
+ DRM_ERROR("timeout waiting for pcode mailbox to become idle\n");
+
+ I915_WRITE(GEN6_PCODE_DATA, 0);
+ I915_WRITE(GEN6_PCODE_MAILBOX,
+ GEN6_PCODE_READY |
+ GEN6_PCODE_WRITE_MIN_FREQ_TABLE);
+ if (wait_for((I915_READ(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) == 0,
+ 500))
+ DRM_ERROR("timeout waiting for pcode mailbox to finish\n");
+
+ /* Check for overclock support */
+ if (wait_for((I915_READ(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) == 0,
+ 500))
+ DRM_ERROR("timeout waiting for pcode mailbox to become idle\n");
+ I915_WRITE(GEN6_PCODE_MAILBOX, GEN6_READ_OC_PARAMS);
+ pcu_mbox = I915_READ(GEN6_PCODE_DATA);
+ if (wait_for((I915_READ(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) == 0,
+ 500))
+ DRM_ERROR("timeout waiting for pcode mailbox to finish\n");
+ if (pcu_mbox & (1<<31)) { /* OC supported */
+ dev_priv->max_delay = pcu_mbox & 0xff;
+ DRM_DEBUG_DRIVER("overclocking supported, adjusting frequency max to %dMHz\n", pcu_mbox * 50);
+ }
+
+ /* requires MSI enabled */
+ I915_WRITE(GEN6_PMIER,
+ GEN6_PM_MBOX_EVENT |
+ GEN6_PM_THERMAL_EVENT |
+ GEN6_PM_RP_DOWN_TIMEOUT |
+ GEN6_PM_RP_UP_THRESHOLD |
+ GEN6_PM_RP_DOWN_THRESHOLD |
+ GEN6_PM_RP_UP_EI_EXPIRED |
+ GEN6_PM_RP_DOWN_EI_EXPIRED);
+
+ spin_lock_irq(&dev_priv->rps_lock);
+ WARN_ON(dev_priv->pm_iir != 0);
+ I915_WRITE(GEN6_PMIMR, 0);
+ spin_unlock_irq(&dev_priv->rps_lock);
+
+ /* enable all PM interrupts */
+ I915_WRITE(GEN6_PMINTRMSK, 0);
+
+ gen6_gt_force_wake_put(dev_priv);
+}
+
static void gen6_enable_rps(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -3227,7 +3372,9 @@ void intel_disable_gt_powersave(struct drm_device *dev)
{
if (IS_IRONLAKE_M(dev))
ironlake_disable_drps(dev);
- if (INTEL_INFO(dev)->gen >= 6 && !IS_VALLEYVIEW(dev))
+ else if (IS_HASWELL(dev))
+ hsw_disable_rps(dev);
+ else if (INTEL_INFO(dev)->gen >= 6 && !IS_VALLEYVIEW(dev))
gen6_disable_rps(dev);
}

@@ -3237,9 +3384,10 @@ void intel_enable_gt_powersave(struct drm_device *dev)
ironlake_enable_drps(dev);
ironlake_enable_rc6(dev);
intel_init_emon(dev);
- }
-
- if ((IS_GEN6(dev) || IS_GEN7(dev)) && !IS_VALLEYVIEW(dev)) {
+ } else if (IS_HASWELL(dev)) {
+ hsw_enable_rps(dev);
+ gen6_update_ring_freq(dev);
+ } else if ((IS_GEN6(dev) || IS_GEN7(dev)) && !IS_VALLEYVIEW(dev)) {
gen6_enable_rps(dev);
gen6_update_ring_freq(dev);
}
--
1.7.11.1