Re: [Intel-gfx] [PATCH 2/5] drm/i915/bxt: WaGsvDisableTurbo

[Kamble, Sagar A]

Hi Tom, Akash

Kindly review this patch.

Thanks
Sagar


On 9/11/2015 11:53 AM, Kamble, Sagar A wrote:

Gentle reminder for review.

Thanks
Sagar

On 8/23/2015 5:52 PM, Sagar Arun Kamble wrote:

Disable Turbo on steppings prior to B0 on BXT due to hangs seen during GT CPD exit.

Change-Id: I50c5c03f59f5ba092db19e17234951d89db42c6c
Signed-off-by: Sagar Arun Kamble <sagar.a.kam...@intel.com>
---
  drivers/gpu/drm/i915/intel_pm.c | 10 ++++++++++
  1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c

index fff0c22..75f1c8c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c

@@ -4450,6 +4450,10 @@ static void gen6_set_rps(struct drm_device *dev, u8 val)

  {
      struct drm_i915_private *dev_priv = dev->dev_private;
  +    /* WaGsvDisableTurbo: Workaround to disable turbo on BXT A* */
+    if (IS_BROXTON(dev) && (INTEL_REVID(dev) < BXT_REVID_B0))
+        return;
+
      WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
      WARN_ON(val > dev_priv->rps.max_freq);
      WARN_ON(val < dev_priv->rps.min_freq);

@@ -4770,6 +4774,12 @@ static void gen9_enable_rps(struct drm_device *dev)

        gen6_init_rps_frequencies(dev);
  +    /* WaGsvDisableTurbo: Workaround to disable turbo on BXT A* */
+    if (IS_BROXTON(dev) && (INTEL_REVID(dev) < BXT_REVID_B0)) {
+        intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
+        return;
+    }
+
      /* Program defaults and thresholds for RPS*/
      I915_WRITE(GEN6_RC_VIDEO_FREQ,
          GEN9_FREQUENCY(dev_priv->rps.rp1_freq));

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