From cfb41411fce52a8e8b6c1f0bd253d4ca7bfcbd0d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Thu, 5 Mar 2015 21:19:51 +0200
Subject: [PATCH] drm/i915: Enable the maxfifo PM5 mode when appropriate on CHV
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CHV has a new knob in Punit to select between some memory power savings
modes PM2 and PM5. We can allow the deeper PM5 when maxfifo mode is
enabled, so let's do so in the hopes for moar power savings.
v2: Put the thing into a separate function to avoid churn later
v3: Don't break VLV
Reviewed-by: Vijay Purushothaman <vijay.a.purushothaman@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
drivers/gpu/drm/i915/i915_reg.h | 3 +++
drivers/gpu/drm/i915/intel_pm.c | 18 ++++++++++++++++++
2 files changed, 21 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 8e29e2a6fe5cf..b43de97f12da7 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -566,6 +566,9 @@
#define DSPFREQSTAT_MASK (0x3 << DSPFREQSTAT_SHIFT)
#define DSPFREQGUAR_SHIFT 14
#define DSPFREQGUAR_MASK (0x3 << DSPFREQGUAR_SHIFT)
+#define DSP_MAXFIFO_PM5_STATUS (1 << 22) /* chv */
+#define DSP_AUTO_CDCLK_GATE_DISABLE (1 << 7) /* chv */
+#define DSP_MAXFIFO_PM5_ENABLE (1 << 6) /* chv */
#define _DP_SSC(val, pipe) ((val) << (2 * (pipe)))
#define DP_SSC_MASK(pipe) _DP_SSC(0x3, (pipe))
#define DP_SSC_PWR_ON(pipe) _DP_SSC(0x0, (pipe))
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index d277d93cffbf2..e90ec21dd9b24 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -263,6 +263,22 @@ static const struct cxsr_latency *intel_get_cxsr_latency(int is_desktop,
return NULL;
}
+static void chv_set_memory_pm5(struct drm_i915_private *dev_priv, bool enable)
+{
+ u32 val;
+
+ mutex_lock(&dev_priv->rps.hw_lock);
+
+ val = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
+ if (enable)
+ val |= DSP_MAXFIFO_PM5_ENABLE;
+ else
+ val &= ~DSP_MAXFIFO_PM5_ENABLE;
+ vlv_punit_write(dev_priv, PUNIT_REG_DSPFREQ, val);
+
+ mutex_unlock(&dev_priv->rps.hw_lock);
+}
+
void intel_set_memory_cxsr(struct drm_i915_private *dev_priv, bool enable)
{
struct drm_device *dev = dev_priv->dev;
@@ -270,6 +286,8 @@ void intel_set_memory_cxsr(struct drm_i915_private *dev_priv, bool enable)
if (IS_VALLEYVIEW(dev)) {
I915_WRITE(FW_BLC_SELF_VLV, enable ? FW_CSPWRDWNEN : 0);
+ if (IS_CHERRYVIEW(dev))
+ chv_set_memory_pm5(dev_priv, enable);
} else if (IS_G4X(dev) || IS_CRESTLINE(dev)) {
I915_WRITE(FW_BLC_SELF, enable ? FW_BLC_SELF_EN : 0);
} else if (IS_PINEVIEW(dev)) {