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drm/i915/ibx: Ensure the HW is powered during PLL HW readout 

The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-4-git-send-email-imre.deak@intel.com
This commit is contained in:
Imre Deak 2016-02-12 18:55:12 +02:00
parent 1729050eb4
commit 12fda3876d
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/i915/intel_display.c
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@ -13658,7 +13658,7 @@ static bool ibx_pch_dpll_get_hw_state(struct drm_i915_private *dev_priv,
{
uint32_t val;
if (!intel_display_power_is_enabled(dev_priv, POWER_DOMAIN_PLLS))
if (!intel_display_power_get_if_enabled(dev_priv, POWER_DOMAIN_PLLS))
return false;
val = I915_READ(PCH_DPLL(pll->id));
@ -13666,6 +13666,8 @@ static bool ibx_pch_dpll_get_hw_state(struct drm_i915_private *dev_priv,
hw_state->fp0 = I915_READ(PCH_FP0(pll->id));
hw_state->fp1 = I915_READ(PCH_FP1(pll->id));
intel_display_power_put(dev_priv, POWER_DOMAIN_PLLS);
return val & DPLL_VCO_ENABLE;
}