src/graphics/display/drivers/intel-i915/power.h

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef SRC_GRAPHICS_DISPLAY_DRIVERS_INTEL_I915_POWER_H_
#define SRC_GRAPHICS_DISPLAY_DRIVERS_INTEL_I915_POWER_H_

#include <fbl/macros.h>

#include "registers-ddi.h"
#include "registers-pipe.h"

namespace i915 {

class Power;
class Controller;

enum PowerWell {
  PowerWell1 = 0,
  PowerWell2 = 1,
};

class PowerWellRef {
 public:
  PowerWellRef();
  ~PowerWellRef();
  PowerWellRef(PowerWellRef&& o);
  PowerWellRef& operator=(PowerWellRef&& o);

 private:
  PowerWellRef(Power* power, PowerWell power_well);

  Power* power_ = nullptr;
  PowerWell power_well_;

  friend Power;

  DISALLOW_COPY_AND_ASSIGN_ALLOW_MOVE(PowerWellRef);
};

class Power {
 public:
  explicit Power(Controller* controller);
  void Resume();
  PowerWellRef GetCdClockPowerWellRef();
  PowerWellRef GetPipePowerWellRef(registers::Pipe pipe);
  PowerWellRef GetDdiPowerWellRef(registers::Ddi ddi);

 private:
  void SetPowerWell1Enable(bool enable);
  void SetPowerWell2Enable(bool enable);

  int32_t power_well1_refs_ = 0;
  int32_t power_well2_refs_ = 0;
  Controller* controller_;

  friend PowerWellRef;

  DISALLOW_COPY_ASSIGN_AND_MOVE(Power);
};

}  // namespace i915

#endif  // SRC_GRAPHICS_DISPLAY_DRIVERS_INTEL_I915_POWER_H_