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drm/i915: fix display power sw state reporting 

Atm, we refcount both power domains and power wells and
intel_display_power_enabled_sw() returns the power domain refcount. What
the callers are really interested in though is the sw state of the
underlying power wells. Due to this we will report incorrectly that a
given power domain is off if its power wells were enabled via another
power domain, for example POWER_DOMAIN_INIT which enables all power
wells.

As a fix return instead the state based on the refcount of all power
wells included in the passed in power domain.

References: https://bugs.freedesktop.org/show_bug.cgi?id=79505
References: https://bugs.freedesktop.org/show_bug.cgi?id=79038
Reported-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Imre Deak 2014-06-02 14:21:10 +03:00 committed by Daniel Vetter
parent 4b0e333ee1
commit b8c000d9bf
1 changed files with 16 additions and 1 deletions
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17
drivers/gpu/drm/i915/intel_pm.c
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@ -5572,10 +5572,25 @@ bool intel_display_power_enabled_sw(struct drm_i915_private *dev_priv,
enum intel_display_power_domain domain)
{
struct i915_power_domains *power_domains;
struct i915_power_well *power_well;
bool is_enabled;
int i;
if (dev_priv->pm.suspended)
return false;
power_domains = &dev_priv->power_domains;
is_enabled = true;
for_each_power_well_rev(i, power_well, BIT(domain), power_domains) {
if (power_well->always_on)
continue;
return power_domains->domain_use_count[domain];
if (!power_well->count) {
is_enabled = false;
break;
}
}
return is_enabled;
}
bool intel_display_power_enabled(struct drm_i915_private *dev_priv,