zircon/system/dev/display/intel-i915/hdmi-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 <ddk/protocol/i2cimpl.h>

namespace i915 {

class GMBusI2c {
public:
    GMBusI2c(registers::Ddi ddi);
    zx_status_t I2cTransact(const i2c_impl_op_t* ops, size_t count);

    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_;

    bool I2cFinish() __TA_REQUIRES(lock_);
    bool I2cWaitForHwReady() __TA_REQUIRES(lock_);
    bool I2cClearNack() __TA_REQUIRES(lock_);
    bool SetDdcSegment(uint8_t block_num) __TA_REQUIRES(lock_);
    bool GMBusRead(uint8_t addr, uint8_t* buf, uint8_t size) __TA_REQUIRES(lock_);
    bool GMBusWrite(uint8_t addr, const uint8_t* buf, uint8_t size) __TA_REQUIRES(lock_);
};

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

private:
    bool InitDdi() final;
    bool Query() 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;
    // Hdmi doesn't need the clock rate when chaning the transcoder
    uint32_t LoadClockRateForTranscoder(registers::Trans transcoder) final { return 0; }

    bool CheckPixelRate(uint64_t pixel_rate) final;

    uint32_t i2c_bus_id() const final { return ddi(); }
};

} // namespace i915