[PATCH 09/15] drm/i915: vlv: factor out vlv_force_gfx_clock

[Imre Deak <imre.deak@xxxxxxxxx>]

This will be needed by the VLV RPM helpers too.

Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_drv.c | 32 ++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_drv.h |  1 +
 drivers/gpu/drm/i915/intel_pm.c | 16 ++--------------
 3 files changed, 35 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 5d8250f..8dee34c 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -920,6 +920,38 @@ static void hsw_runtime_resume(struct drm_i915_private *dev_priv)
 	hsw_disable_pc8(dev_priv);
 }
 
+int vlv_force_gfx_clock(struct drm_i915_private *dev_priv, bool force_on)
+{
+	u32 val;
+	int err;
+
+#define COND (I915_READ(VLV_GTLC_SURVIVABILITY_REG) & VLV_GFX_CLK_STATUS_BIT)
+	/* Wait for a previous force on/off to settle */
+	if (force_on) {
+		err = wait_for(!COND, 5);
+		if (err) {
+			DRM_ERROR("timeout waiting for GFX clock force-off\n");
+			return err;
+		}
+	}
+
+	val = I915_READ(VLV_GTLC_SURVIVABILITY_REG);
+	val &= ~VLV_GFX_CLK_FORCE_ON_BIT;
+	if (force_on)
+		val |= VLV_GFX_CLK_FORCE_ON_BIT;
+	I915_WRITE(VLV_GTLC_SURVIVABILITY_REG, val);
+
+	if (!force_on)
+		return 0;
+
+	err = wait_for(COND, 5);
+	if (err)
+		DRM_ERROR("timeout waiting for GFX clock force-on\n");
+
+	return err;
+#undef COND
+}
+
 static int intel_runtime_suspend(struct device *device)
 {
 	struct pci_dev *pdev = to_pci_dev(device);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 55addaa..0800429 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1952,6 +1952,7 @@ extern unsigned long i915_chipset_val(struct drm_i915_private *dev_priv);
 extern unsigned long i915_mch_val(struct drm_i915_private *dev_priv);
 extern unsigned long i915_gfx_val(struct drm_i915_private *dev_priv);
 extern void i915_update_gfx_val(struct drm_i915_private *dev_priv);
+int vlv_force_gfx_clock(struct drm_i915_private *dev_priv, bool on);
 
 extern void intel_console_resume(struct work_struct *work);
 
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index e0b8982..5728238 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3094,16 +3094,7 @@ static void vlv_set_rps_idle(struct drm_i915_private *dev_priv)
 	/* Mask turbo interrupt so that they will not come in between */
 	I915_WRITE(GEN6_PMINTRMSK, 0xffffffff);
 
-	/* Bring up the Gfx clock */
-	I915_WRITE(VLV_GTLC_SURVIVABILITY_REG,
-		I915_READ(VLV_GTLC_SURVIVABILITY_REG) |
-				VLV_GFX_CLK_FORCE_ON_BIT);
-
-	if (wait_for(((VLV_GFX_CLK_STATUS_BIT &
-		I915_READ(VLV_GTLC_SURVIVABILITY_REG)) != 0), 5)) {
-			DRM_ERROR("GFX_CLK_ON request timed out\n");
-		return;
-	}
+	vlv_force_gfx_clock(dev_priv, true);
 
 	dev_priv->rps.cur_freq = dev_priv->rps.min_freq_softlimit;
 
@@ -3114,10 +3105,7 @@ static void vlv_set_rps_idle(struct drm_i915_private *dev_priv)
 				& GENFREQSTATUS) == 0, 5))
 		DRM_ERROR("timed out waiting for Punit\n");
 
-	/* Release the Gfx clock */
-	I915_WRITE(VLV_GTLC_SURVIVABILITY_REG,
-		I915_READ(VLV_GTLC_SURVIVABILITY_REG) &
-				~VLV_GFX_CLK_FORCE_ON_BIT);
+	vlv_force_gfx_clock(dev_priv, false);
 
 	I915_WRITE(GEN6_PMINTRMSK,
 		   gen6_rps_pm_mask(dev_priv, dev_priv->rps.cur_freq));
-- 
1.8.4

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