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drm/i915: Do vlv cmnlane toggle w/a in more cases

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In case the cmnlane power well is down but cmnreset isn't asserted we
would currently skip the off+on toggle for the power well. That could
leave cmnreset deasserted while cmnlane is powered down which might
lead to problems with the PHY.

To avoid such issues skip the cmnlane toggle only if both cmnlane and
disp2d wells are up and cmnreset is already deasserted. In all other
cases power down the cmnlane well which will also make sure cmnreset
gets asserted correctly while cmnlane is powered down.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-10-16 20:52:33 +03:00 committed by Daniel Vetter
parent 77cde95217
commit 5d93a6e5a9
1 changed files with 2 additions and 5 deletions
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7
drivers/gpu/drm/i915/intel_runtime_pm.c
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@ -1137,12 +1137,9 @@ static void vlv_cmnlane_wa(struct drm_i915_private *dev_priv)
struct i915_power_well *disp2d =
lookup_power_well(dev_priv, PUNIT_POWER_WELL_DISP2D);
/* nothing to do if common lane is already off */
if (!cmn->ops->is_enabled(dev_priv, cmn))
return;
/* If the display might be already active skip this */
if (disp2d->ops->is_enabled(dev_priv, disp2d) &&
if (cmn->ops->is_enabled(dev_priv, cmn) &&
disp2d->ops->is_enabled(dev_priv, disp2d) &&
I915_READ(DPIO_CTL) & DPIO_CMNRST)
return;