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| author |   Patrik Jakobsson <patrik.jakobsson@linux.intel.com> | 2016-02-18 17:21:11 +0200 |
|---|---|---|
| committer |   Jani Nikula <jani.nikula@intel.com> | 2016-02-22 18:37:25 +0200 |
| commit | 9b6f20984c5402af06e13cde64b5fe7c31853d1a (patch) | |
| tree | dae29a5de53e84b0900b6e32c08a558c5c2b8789 /drivers/gpu/drm/i915/intel_runtime_pm.c | |
| parent | drm/i915/skl: Ensure HW is powered during DDB HW state readout (diff) | |
| download | linux-dev-9b6f20984c5402af06e13cde64b5fe7c31853d1a.tar.xz linux-dev-9b6f20984c5402af06e13cde64b5fe7c31853d1a.zip | |
drm/i915/gen9: Check for DC state mismatch
The DMC can incorrectly run off and allow DC states on it's own. We
don't know the root-cause for this yet but this patch makes it more
visible.
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455808874-22089-2-git-send-email-mika.kuoppala@intel.com
(cherry picked from commit 832dba889e27487c3087149f1039acc3feb89003)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_runtime_pm.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c index 89dcc99ac3ca..19e6ff64ce9d 100644 --- a/drivers/gpu/drm/i915/intel_runtime_pm.c +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c @@ -494,10 +494,18 @@ static void gen9_set_dc_state(struct drm_i915_private *dev_priv, uint32_t state) val = I915_READ(DC_STATE_EN); DRM_DEBUG_KMS("Setting DC state from %02x to %02x\n", val & mask, state); + + /* Check if DMC is ignoring our DC state requests */ + if ((val & mask) != dev_priv->csr.dc_state) + DRM_ERROR("DC state mismatch (0x%x -> 0x%x)\n", + dev_priv->csr.dc_state, val & mask); + val &= ~mask; val |= state; I915_WRITE(DC_STATE_EN, val); POSTING_READ(DC_STATE_EN); + + dev_priv->csr.dc_state = val & mask; } void bxt_enable_dc9(struct drm_i915_private *dev_priv) |