[Intel-gfx] [PATCH v2] Revert "drm/i915/chv: Set min freq to efficient frequency on chv"

[deepak.s at linux.intel.com]

From: Deepak S <deepak.s at linux.intel.com>

With latest Punit FW, vgg input voltag drop falling to minimum is fixed.
So reverting the WA patch & moving to turbo freq opreation range to [RPn -> RP0]

This reverts commit 5b7c91b78b1ce6663e0f1f037f6cb4d7c9537d44.

commit 5b7c91b78b1ce6663e0f1f037f6cb4d7c9537d44
Author: Deepak S <deepak.s at linux.intel.com>
Date:   Sat May 9 18:15:46 2015 +0530

    drm/i915/chv: Set min freq to efficient frequency on chv

v2: Fix inconsistent return type. (Chris)

Acked-by: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Deepak S <deepak.s at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 81ab119..7844bf5 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5579,6 +5579,24 @@ static int cherryview_rps_guar_freq(struct drm_i915_private *dev_priv)
 	return rp1;
 }
 
+static u32 cherryview_rps_min_freq(struct drm_i915_private *dev_priv)
+{
+	struct pci_device *pdev = dev_priv->drm.pdev;
+	u32 val, rpn;
+
+	if (pdev->revision >= 0x20) {
+		val = vlv_punit_read(dev_priv, FB_GFX_FMIN_AT_VMIN_FUSE);
+		rpn = ((val >> FB_GFX_FMIN_AT_VMIN_FUSE_SHIFT) &
+		       FB_GFX_FREQ_FUSE_MASK);
+	} else { /* For pre-production hardware */
+		val = vlv_punit_read(dev_priv, PUNIT_GPU_STATUS_REG);
+		rpn = ((val >> PUNIT_GPU_STATIS_GFX_MIN_FREQ_SHIFT) &
+		       PUNIT_GPU_STATUS_GFX_MIN_FREQ_MASK);
+	}
+
+	return rpn;
+}
+
 static int valleyview_rps_guar_freq(struct drm_i915_private *dev_priv)
 {
 	u32 val, rp1;
@@ -5818,8 +5836,7 @@ static void cherryview_init_gt_powersave(struct drm_i915_private *dev_priv)
 			 intel_gpu_freq(dev_priv, dev_priv->rps.rp1_freq),
 			 dev_priv->rps.rp1_freq);
 
-	/* PUnit validated range is only [RPe, RP0] */
-	dev_priv->rps.min_freq = dev_priv->rps.efficient_freq;
+	dev_priv->rps.min_freq = cherryview_rps_min_freq(dev_priv);
 	DRM_DEBUG_DRIVER("min GPU freq: %d MHz (%u)\n",
 			 intel_gpu_freq(dev_priv, dev_priv->rps.min_freq),
 			 dev_priv->rps.min_freq);
-- 
1.9.1