zircon/system/dev/display/intel-i915/dp-display.h

// Copyright 2017 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.

#pragma once

#include "display-device.h"
#include "dpcd.h"
#include <ddk/protocol/i2cimpl.h>

namespace i915 {

class DpAuxMessage;

class DpAux {
public:
    DpAux(registers::Ddi ddi);

    zx_status_t I2cTransact(const i2c_impl_op_t* ops, size_t count);

    bool DpcdRead(uint32_t addr, uint8_t* buf, size_t size);
    bool DpcdWrite(uint32_t addr, const uint8_t* buf, size_t size);

    void set_mmio_space(ddk::MmioBuffer* mmio_space) {
        fbl::AutoLock lock(&lock_);
        mmio_space_ = mmio_space;
    }
private:
    const registers::Ddi ddi_;
    // The lock protects the registers this class writes to, not the whole register io space.
    ddk::MmioBuffer* mmio_space_ __TA_GUARDED(lock_);
    mtx_t lock_;

    zx_status_t DpAuxRead(uint32_t dp_cmd, uint32_t addr,
                          uint8_t* buf, size_t size) __TA_REQUIRES(lock_);
    zx_status_t DpAuxReadChunk(uint32_t dp_cmd, uint32_t addr, uint8_t* buf, uint32_t size_in,
                               size_t* size_out) __TA_REQUIRES(lock_);
    zx_status_t DpAuxWrite(uint32_t dp_cmd, uint32_t addr,
                           const uint8_t* buf, size_t size) __TA_REQUIRES(lock_);
    zx_status_t SendDpAuxMsg(const DpAuxMessage& request, DpAuxMessage* reply) __TA_REQUIRES(lock_);
    zx_status_t SendDpAuxMsgWithRetry(const DpAuxMessage& request,
                                      DpAuxMessage* reply) __TA_REQUIRES(lock_);
};

class DpDisplay : public DisplayDevice {
public:
    DpDisplay(Controller* controller, uint64_t id, registers::Ddi ddi);

private:
    bool Query() final;
    bool InitDdi() final;
    bool DdiModeset(const display_mode_t& mode,
                    registers::Pipe pipe, registers::Trans trans) final;
    bool PipeConfigPreamble(const display_mode_t& mode,
                            registers::Pipe pipe, registers::Trans trans) final;
    bool PipeConfigEpilogue(const display_mode_t& mode,
                            registers::Pipe pipe, registers::Trans trans) final;
    bool ComputeDpllState(uint32_t pixel_clock_10khz, struct dpll_state* config) final;
    uint32_t LoadClockRateForTranscoder(registers::Trans transcoder) final;

    bool CheckPixelRate(uint64_t pixel_rate) final;

    uint32_t i2c_bus_id() const final { return ddi() + registers::kDdiCount; }

    bool DpcdWrite(uint32_t addr, const uint8_t* buf, size_t size);
    bool DpcdRead(uint32_t addr, uint8_t* buf, size_t size);
    bool DpcdRequestLinkTraining(const dpcd::TrainingPatternSet& tp_set,
                                 const dpcd::TrainingLaneSet lanes[]);
    bool DpcdUpdateLinkTraining(const dpcd::TrainingLaneSet lanes[]);
    template<uint32_t addr, typename T> bool DpcdReadPairedRegs(
            hwreg::RegisterBase<T, typename T::ValueType>* status);
    bool DpcdHandleAdjustRequest(dpcd::TrainingLaneSet* training, dpcd::AdjustRequestLane* adjust);
    bool DoLinkTraining();
    bool LinkTrainingSetup();
    // For locking Clock Recovery Circuit of the DisplayPort receiver
    bool LinkTrainingStage1(dpcd::TrainingPatternSet* tp_set, dpcd::TrainingLaneSet* lanes);
    // For optimizing equalization, determining symbol  boundary, and achieving inter-lane alignment
    bool LinkTrainingStage2(dpcd::TrainingPatternSet* tp_set, dpcd::TrainingLaneSet* lanes);

    bool SetBacklightOn(bool on);
    bool InitBacklightHw() override;

    bool IsBacklightOn();
    // Sets the backlight brightness with |val| as a coefficient on the maximum
    // brightness. |val| must be in [0, 1]. If the panel has a minimum fractional
    // brightness, then |val| will be clamped to [min, 1].
    bool SetBacklightBrightness(double val);

    // Gets the backlight brightness as a coefficient on the maximum brightness,
    // between the minimum brightness and 1.
    double GetBacklightBrightness();

    bool HandleHotplug(bool long_pulse) override;
    bool HasBacklight() override;
    void SetBacklightState(bool power, uint8_t brightness) override;
    void GetBacklightState(bool* power, uint8_t* brightness) override;

    uint8_t dpcd_capability(uint16_t addr) {
        return dpcd_capabilities_[addr - dpcd::DPCD_CAP_START];
    }
    uint8_t dpcd_edp_capability(uint16_t addr) {
        return dpcd_edp_capabilities_[addr - dpcd::DPCD_EDP_CAP_START];
    }

    uint8_t dp_lane_count_;
    uint32_t dp_link_rate_mhz_;
    uint8_t dp_link_rate_idx_plus1_;
    bool dp_enhanced_framing_enabled_;

    uint8_t dpcd_capabilities_[16];
    uint8_t dpcd_edp_capabilities_[5];
    bool backlight_aux_brightness_;
    bool backlight_aux_power_;

    // The backlight brightness coefficient, in the range [min brightness, 1].
    double backlight_brightness_ = 1.0f;
};

} // namespace i915