[v3] drm/i915/vlv: Remove wait for for punit to updates freq.

Commit Message

[e-mail] May 9, 2015, 12:34 p.m. UTC

From: Deepak S <[e-mail]>

When GPU is idle on VLV, Request freq to punit should be good enough to
get the voltage back to VNN. Also, make sure gfx clock force applies
before requesting the freq fot vlv.

v2: Do forcewake before setting idle frequency (ville)
    Update function comments to match the code (Deepak)

v3: Fix get/put across idle frequency Request. (Ville)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75244
suggested-by: Jesse Barnes <[e-mail]>
Signed-off-by: Deepak S <[e-mail]>
Reviewed-by: Ville Syrjälä <[e-mail]>
---
 drivers/gpu/drm/i915/intel_pm.c | 41 +++++++++++------------------------------
 1 file changed, 11 insertions(+), 30 deletions(-)

Comments

Shuang He May 9, 2015, 7:19 p.m. UTC | #1

Tested-By: Intel Graphics QA PRTS (Patch Regression Test System Contact: [e-mail])
Task id: 6370
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  276/276              276/276
ILK                                  302/302              302/302
SNB                                  316/316              316/316
IVB                                  342/342              342/342
BYT                                  286/286              286/286
BDW                                  321/321              321/321
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
Note: You need to pay more attention to line start with '*'

Patch

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index a7516ed..82dfdbc 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4043,51 +4043,32 @@  static void valleyview_set_rps(struct drm_device *dev, u8 val)
 	trace_intel_gpu_freq_change(intel_gpu_freq(dev_priv, val));
 }
 
-/* vlv_set_rps_idle: Set the frequency to Rpn if Gfx clocks are down
+/* vlv_set_rps_idle: Set the frequency to idle, if Gfx clocks are down
  *
  * * If Gfx is Idle, then
- * 1. Mask Turbo interrupts
- * 2. Bring up Gfx clock
- * 3. Change the freq to Rpn and wait till P-Unit updates freq
- * 4. Clear the Force GFX CLK ON bit so that Gfx can down
- * 5. Unmask Turbo interrupts
+ * 1. Forcewake Media well.
+ * 2. Request idle freq.
+ * 3. Release Forcewake of Media well.
 */
 static void vlv_set_rps_idle(struct drm_i915_private *dev_priv)
 {
 	struct drm_device *dev = dev_priv->dev;
 	u32 val = dev_priv->rps.idle_freq;
 
-	/* CHV and latest VLV don't need to force the gfx clock */
-	if (IS_CHERRYVIEW(dev) || dev->pdev->revision >= 0xd) {
+	/* CHV don't need to force the gfx clock */
+	if (IS_CHERRYVIEW(dev)) {
 		valleyview_set_rps(dev_priv->dev, val);
 		return;
 	}
 
-	/*
-	 * When we are idle.  Drop to min voltage state.
-	 */
-
 	if (dev_priv->rps.cur_freq <= val)
 		return;
 
-	/* Mask turbo interrupt so that they will not come in between */
-	I915_WRITE(GEN6_PMINTRMSK,
-		   gen6_sanitize_rps_pm_mask(dev_priv, ~0));
-
-	vlv_force_gfx_clock(dev_priv, true);
-
-	dev_priv->rps.cur_freq = val;
-
-	vlv_punit_write(dev_priv, PUNIT_REG_GPU_FREQ_REQ, val);
-
-	if (wait_for(((vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS))
-				& GENFREQSTATUS) == 0, 100))
-		DRM_ERROR("timed out waiting for Punit\n");
-
-	gen6_set_rps_thresholds(dev_priv, val);
-	vlv_force_gfx_clock(dev_priv, false);
-
-	I915_WRITE(GEN6_PMINTRMSK, gen6_rps_pm_mask(dev_priv, val));
+	/* Wake up the media well, as that takes a lot less
+	 * power than the Render well. */
+	intel_uncore_forcewake_get(dev_priv, FORCEWAKE_MEDIA);
+	valleyview_set_rps(dev_priv->dev, val);
+	intel_uncore_forcewake_put(dev_priv, FORCEWAKE_MEDIA);
 }
 
 void gen6_rps_busy(struct drm_i915_private *dev_priv)