| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.15 119/122] drm/i915: fix display power sw state reporting | Date | Mon, 7 Jul 2014 16:58:01 -0700 |
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3.15-stable review patch. If anyone has any objections, please let me know.
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From: Imre Deak <imre.deak@intel.com>
commit b8c000d9bf23e7c1155ef421f595d1cbc25262da upstream.
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> Acked-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/gpu/drm/i915/intel_pm.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -5313,10 +5313,25 @@ bool intel_display_power_enabled_sw(stru 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,
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