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drm/i915: sanity check power well sw state against hw state

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Suggested by Daniel.

v2:
- sanitize the state checking condition, the original was rather
  confusing (partly due to the unfortunate naming of
  i915.disable_power_well) (Ville)
- simpler message+backtrace generation by using WARN instead of WARN_ON
  (Ville)
- check if always-on power wells are truly on all the time

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Imre Deak 2014-03-04 19:23:06 +02:00 committed by Daniel Vetter
parent dd7c0b66e5
commit 25eaa003bd
1 changed files with 35 additions and 3 deletions
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38
drivers/gpu/drm/i915/intel_pm.c
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@ -5411,6 +5411,29 @@ static bool i9xx_always_on_power_well_enabled(struct drm_i915_private *dev_priv,
return true;
}
static void check_power_well_state(struct drm_i915_private *dev_priv,
struct i915_power_well *power_well)
{
bool enabled = power_well->ops->is_enabled(dev_priv, power_well);
if (power_well->always_on || !i915.disable_power_well) {
if (!enabled)
goto mismatch;
return;
}
if (enabled != (power_well->count > 0))
goto mismatch;
return;
mismatch:
WARN(1, "state mismatch for '%s' (always_on %d hw state %d use-count %d disable_power_well %d\n",
power_well->name, power_well->always_on, enabled,
power_well->count, i915.disable_power_well);
}
void intel_display_power_get(struct drm_i915_private *dev_priv,
enum intel_display_power_domain domain)
{
@ -5422,9 +5445,14 @@ void intel_display_power_get(struct drm_i915_private *dev_priv,
mutex_lock(&power_domains->lock);
for_each_power_well(i, power_well, BIT(domain), power_domains)
if (!power_well->count++)
for_each_power_well(i, power_well, BIT(domain), power_domains) {
if (!power_well->count++) {
DRM_DEBUG_KMS("enabling %s\n", power_well->name);
power_well->ops->enable(dev_priv, power_well);
}
check_power_well_state(dev_priv, power_well);
}
power_domains->domain_use_count[domain]++;
@ -5448,8 +5476,12 @@ void intel_display_power_put(struct drm_i915_private *dev_priv,
for_each_power_well_rev(i, power_well, BIT(domain), power_domains) {
WARN_ON(!power_well->count);
if (!--power_well->count && i915.disable_power_well)
if (!--power_well->count && i915.disable_power_well) {
DRM_DEBUG_KMS("disabling %s\n", power_well->name);
power_well->ops->disable(dev_priv, power_well);
}
check_power_well_state(dev_priv, power_well);
}
mutex_unlock(&power_domains->lock);