On Thu, May 19, 2016 at 10:49:23PM +0300, Imre Deak wrote:
> On Mon, 2016-05-16 at 16:59 +0300, ville.syrjala@xxxxxxxxxxxxxxx wrote:
> > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> >
> > 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.
> >
> > Cc: Imre Deak <imre.deak@xxxxxxxxx>
> > Suggested-by: Imre Deak <imre.deak@xxxxxxxxx>
> > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/intel_runtime_pm.c | 11 +++++++++++
> > 1 file changed, 11 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
> > index b70e123f67ca..27cb92c18bb5 100644
> > --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> > +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> > @@ -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 skl_assert_dbuf_enabled(struct drm_i915_private *dev_priv)
>
> I would've used gen9_ prefix. Either way:
Changed while applying.
> Reviewed-by: Imre Deak <imre.deak@xxxxxxxxx>
>
> > +{
> > + 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));
> >
> > + skl_assert_dbuf_enabled(dev_priv);
> > +
> > if (IS_BROXTON(dev_priv))
> > broxton_ddi_phy_verify_state(dev_priv);
> > }
--
Ville Syrjälä
Intel OTC
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