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drm/i915: Assert the dbuf is enabled when disabling DC5/6 

Like with cdclk, the DMC is supposed to manage dbuf enabling/disabling.
Let's make sure it has correctly restored the dbuf state to enabled
when we disable the DC states.

v2: s/skl/gen9/ in function name (Imre)

Cc: Imre Deak <imre.deak@intel.com>
Suggested-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1463407180-28993-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>
This commit is contained in:
Ville Syrjälä 2016-05-16 16:59:40 +03:00
parent d1b32c32e8
commit 18a8067c57
1 changed files with 11 additions and 0 deletions
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11
drivers/gpu/drm/i915/intel_runtime_pm.c
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@ -806,6 +806,15 @@ static bool gen9_dc_off_power_well_enabled(struct drm_i915_private *dev_priv,
return (I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5_DC6_MASK) == 0;
}
static void gen9_assert_dbuf_enabled(struct drm_i915_private *dev_priv)
{
u32 tmp = I915_READ(DBUF_CTL);
WARN((tmp & (DBUF_POWER_STATE | DBUF_POWER_REQUEST)) !=
(DBUF_POWER_STATE | DBUF_POWER_REQUEST),
"Unexpected DBuf power power state (0x%08x)\n", tmp);
}
static void gen9_dc_off_power_well_enable(struct drm_i915_private *dev_priv,
struct i915_power_well *power_well)
{
@ -814,6 +823,8 @@ static void gen9_dc_off_power_well_enable(struct drm_i915_private *dev_priv,
WARN_ON(dev_priv->cdclk_freq !=
dev_priv->display.get_display_clock_speed(dev_priv->dev));
gen9_assert_dbuf_enabled(dev_priv);
if (IS_BROXTON(dev_priv))
broxton_ddi_phy_verify_state(dev_priv);
}