diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_display_power.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_display_power.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c index 369317805d24..d2102cc17bb4 100644 --- a/drivers/gpu/drm/i915/display/intel_display_power.c +++ b/drivers/gpu/drm/i915/display/intel_display_power.c @@ -6214,6 +6214,37 @@ void intel_power_domains_driver_remove(struct drm_i915_private *i915) } /** + * intel_power_domains_sanitize_state - sanitize power domains state + * @i915: i915 device instance + * + * Sanitize the power domains state during driver loading and system resume. + * The function will disable all display power wells that BIOS has enabled + * without a user for it (any user for a power well has taken a reference + * on it by the time this function is called, after the state of all the + * pipe, encoder, etc. HW resources have been sanitized). + */ +void intel_power_domains_sanitize_state(struct drm_i915_private *i915) +{ + struct i915_power_domains *power_domains = &i915->power_domains; + struct i915_power_well *power_well; + + mutex_lock(&power_domains->lock); + + for_each_power_well_reverse(i915, power_well) { + if (power_well->desc->always_on || power_well->count || + !power_well->desc->ops->is_enabled(i915, power_well)) + continue; + + drm_dbg_kms(&i915->drm, + "BIOS left unused %s power well enabled, disabling it\n", + power_well->desc->name); + intel_power_well_disable(i915, power_well); + } + + mutex_unlock(&power_domains->lock); +} + +/** * intel_power_domains_enable - enable toggling of display power wells * @i915: i915 device instance * |