drm/i915/gen9: Verify and enforce dc6 state writes

It has been observed that sometimes disabling the dc6 fails
and dc6 state pops back up, brief moment after disabling. This
has to be dmc save/restore timing issue or other bug in the
way dc states are handled.

Try to work around this issue as we don't have firmware fix
yet available. Verify that the value we wrote for the dmc sticks,
and also enforce it by rewriting it, if it didn't.

v2: Zero rereads on rewrite for extra paranoia (Imre)

Testcase: kms_flip/basic-flip-vs-dpms
References: https://bugs.freedesktop.org/show_bug.cgi?id=93768
Cc: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455811089-27884-1-git-send-email-mika.kuoppala@intel.com

diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 8b9290fdb3b22512aa7f858c66b57eb7bf037ba4..814cf5ac1ef03ba8d764ba3acf858cdac0ed8f6b 100644 (file)
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -470,6 +470,43 @@ static void gen9_set_dc_state_debugmask_memory_up(
        }
 }
 
+static void gen9_write_dc_state(struct drm_i915_private *dev_priv,
+                               u32 state)
+{
+       int rewrites = 0;
+       int rereads = 0;
+       u32 v;
+
+       I915_WRITE(DC_STATE_EN, state);
+
+       /* It has been observed that disabling the dc6 state sometimes
+        * doesn't stick and dmc keeps returning old value. Make sure
+        * the write really sticks enough times and also force rewrite until
+        * we are confident that state is exactly what we want.
+        */
+       do  {
+               v = I915_READ(DC_STATE_EN);
+
+               if (v != state) {
+                       I915_WRITE(DC_STATE_EN, state);
+                       rewrites++;
+                       rereads = 0;
+               } else if (rereads++ > 5) {
+                       break;
+               }
+
+       } while (rewrites < 100);
+
+       if (v != state)
+               DRM_ERROR("Writing dc state to 0x%x failed, now 0x%x\n",
+                         state, v);
+
+       /* Most of the times we need one retry, avoid spam */
+       if (rewrites > 1)
+               DRM_DEBUG_KMS("Rewrote dc state to 0x%x %d times\n",
+                             state, rewrites);
+}
+
 static void gen9_set_dc_state(struct drm_i915_private *dev_priv, uint32_t state)
 {
        uint32_t val;
@@ -502,8 +539,8 @@ static void gen9_set_dc_state(struct drm_i915_private *dev_priv, uint32_t state)
 
        val &= ~mask;
        val |= state;
-       I915_WRITE(DC_STATE_EN, val);
-       POSTING_READ(DC_STATE_EN);
+
+       gen9_write_dc_state(dev_priv, val);
 
        dev_priv->csr.dc_state = val & mask;
 }