Atmosphere/stratosphere/boot/source/boot_display.cpp

/*
 * Copyright (c) 2018-2019 Atmosphère-NX
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include "boot_display.hpp"
#include "boot_i2c_utils.hpp"
#include "boot_pmc_wrapper.hpp"

#include "boot_registers_clkrst.hpp"
#include "boot_registers_di.hpp"
#include "boot_registers_gpio.hpp"
#include "boot_registers_pinmux.hpp"
#include "boot_registers_pmc.hpp"

namespace ams::boot {

    /* Display configuration included into anonymous namespace. */
    namespace {

#include "boot_display_config.inc"

    }

    namespace {

        /* Helpful defines. */
        constexpr size_t DeviceAddressSpaceAlignSize = 0x400000;
        constexpr size_t DeviceAddressSpaceAlignMask = DeviceAddressSpaceAlignSize - 1;
        constexpr uintptr_t FrameBufferPaddr = DisplayConfigFrameBufferAddress;
        constexpr size_t FrameBufferWidth = 768;
        constexpr size_t FrameBufferHeight = 1280;
        constexpr size_t FrameBufferSize = FrameBufferHeight * FrameBufferWidth * sizeof(u32);

        constexpr uintptr_t Disp1Base = 0x54200000ul;
        constexpr uintptr_t DsiBase = 0x54300000ul;
        constexpr uintptr_t ClkRstBase = 0x60006000ul;
        constexpr uintptr_t GpioBase = 0x6000D000ul;
        constexpr uintptr_t ApbMiscBase = 0x70000000ul;
        constexpr uintptr_t MipiCalBase = 0x700E3000ul;
        constexpr size_t Disp1Size = 0x3000;
        constexpr size_t DsiSize = 0x1000;
        constexpr size_t ClkRstSize = 0x1000;
        constexpr size_t GpioSize = 0x1000;
        constexpr size_t ApbMiscSize = 0x1000;
        constexpr size_t MipiCalSize = 0x1000;

        /* Types. */

        /* Globals. */
        bool g_is_display_intialized = false;
        u32 *g_frame_buffer = nullptr;
        bool g_is_mariko = false;
        u32 g_lcd_vendor = 0;
        Handle g_dc_das_hnd = INVALID_HANDLE;
        u8 g_frame_buffer_storage[DeviceAddressSpaceAlignSize + FrameBufferSize];

        uintptr_t g_disp1_regs = 0;
        uintptr_t g_dsi_regs = 0;
        uintptr_t g_clk_rst_regs = 0;
        uintptr_t g_gpio_regs = 0;
        uintptr_t g_apb_misc_regs = 0;
        uintptr_t g_mipi_cal_regs = 0;

        /* Helper functions. */
        void InitializeRegisterBaseAddresses() {
            g_disp1_regs    = dd::GetIoMapping(Disp1Base, Disp1Size);
            g_dsi_regs      = dd::GetIoMapping(DsiBase, DsiSize);
            g_clk_rst_regs  = dd::GetIoMapping(ClkRstBase, ClkRstSize);
            g_gpio_regs     = dd::GetIoMapping(GpioBase, GpioSize);
            g_apb_misc_regs = dd::GetIoMapping(ApbMiscBase, ApbMiscSize);
            g_mipi_cal_regs = dd::GetIoMapping(MipiCalBase, MipiCalSize);
        }

        inline void DoRegisterWrites(uintptr_t base_address, const RegisterWrite *reg_writes, size_t num_writes) {
            for (size_t i = 0; i < num_writes; i++) {
                reg::Write(base_address + reg_writes[i].offset, reg_writes[i].value);
            }
        }

        inline void DoSocDependentRegisterWrites(uintptr_t base_address, const RegisterWrite *reg_writes_erista, size_t num_writes_erista, const RegisterWrite *reg_writes_mariko, size_t num_writes_mariko) {
            if (g_is_mariko) {
                DoRegisterWrites(base_address, reg_writes_mariko, num_writes_mariko);
            } else {
                DoRegisterWrites(base_address, reg_writes_erista, num_writes_erista);
            }
        }

        inline void DoDsiSleepOrRegisterWrites(const DsiSleepOrRegisterWrite *reg_writes, size_t num_writes) {
            for (size_t i = 0; i < num_writes; i++) {
                switch (reg_writes[i].kind) {
                    case DsiSleepOrRegisterWriteKind_Write:
                        reg::Write(g_dsi_regs + sizeof(u32) * reg_writes[i].offset, reg_writes[i].value);
                        break;
                    case DsiSleepOrRegisterWriteKind_Sleep:
                        svcSleepThread(1'000'000ul * u64(reg_writes[i].offset));
                        break;
                    AMS_UNREACHABLE_DEFAULT_CASE();
                }
            }
        }

#define DO_REGISTER_WRITES(base_address, writes) DoRegisterWrites(base_address, writes, util::size(writes))
#define DO_SOC_DEPENDENT_REGISTER_WRITES(base_address, writes) DoSocDependentRegisterWrites(base_address, writes##Erista, util::size(writes##Erista), writes##Mariko, util::size(writes##Mariko))
#define DO_DSI_SLEEP_OR_REGISTER_WRITES(writes) DoDsiSleepOrRegisterWrites(writes, util::size(writes))

        void InitializeFrameBuffer() {
            if (g_frame_buffer != nullptr) {
                std::memset(g_frame_buffer, 0x00, FrameBufferSize);
                armDCacheFlush(g_frame_buffer, FrameBufferSize);
            } else {
                const uintptr_t frame_buffer_aligned = ((reinterpret_cast<uintptr_t>(g_frame_buffer_storage) + DeviceAddressSpaceAlignMask) & ~uintptr_t(DeviceAddressSpaceAlignMask));
                g_frame_buffer = reinterpret_cast<u32 *>(frame_buffer_aligned);
                std::memset(g_frame_buffer, 0x00, FrameBufferSize);
                armDCacheFlush(g_frame_buffer, FrameBufferSize);

                constexpr u64 DeviceName_DC = 2;

                /* Create Address Space. */
                R_ASSERT(svcCreateDeviceAddressSpace(&g_dc_das_hnd, 0, (1ul << 32)));
                /* Attach it to the DC. */
                R_ASSERT(svcAttachDeviceAddressSpace(DeviceName_DC, g_dc_das_hnd));

                /* Map the framebuffer for the DC as read-only. */
                R_ASSERT(svcMapDeviceAddressSpaceAligned(g_dc_das_hnd, CUR_PROCESS_HANDLE, frame_buffer_aligned, FrameBufferSize, FrameBufferPaddr, 1));
            }
        }

        void FinalizeFrameBuffer() {
            if (g_frame_buffer != nullptr) {
                const uintptr_t frame_buffer_aligned = reinterpret_cast<uintptr_t>(g_frame_buffer);
                constexpr u64 DeviceName_DC = 2;

                /* Unmap the framebuffer from the DC. */
                R_ASSERT(svcUnmapDeviceAddressSpace(g_dc_das_hnd, CUR_PROCESS_HANDLE, frame_buffer_aligned, FrameBufferSize, FrameBufferPaddr));
                /* Detach address space from the DC. */
                R_ASSERT(svcDetachDeviceAddressSpace(DeviceName_DC, g_dc_das_hnd));
                /* Close the address space. */
                R_ASSERT(svcCloseHandle(g_dc_das_hnd));
                g_dc_das_hnd = INVALID_HANDLE;
                g_frame_buffer = nullptr;
            }
        }

        void WaitDsiTrigger() {
            os::TimeoutHelper timeout_helper(250'000'000ul);

            while (true) {
                if (timeout_helper.TimedOut()) {
                    break;
                }
                if (reg::Read(g_dsi_regs + sizeof(u32) * DSI_TRIGGER) == 0) {
                    break;
                }
            }

            svcSleepThread(5'000'000ul);
        }

        void WaitDsiHostControl() {
            os::TimeoutHelper timeout_helper(150'000'000ul);

            while (true) {
                if (timeout_helper.TimedOut()) {
                    break;
                }
                if ((reg::Read(g_dsi_regs + sizeof(u32) * DSI_HOST_CONTROL) & DSI_HOST_CONTROL_IMM_BTA) == 0) {
                    break;
                }
            }
        }

    }

    void InitializeDisplay() {
        /* Setup globals. */
        InitializeRegisterBaseAddresses();
        g_is_mariko = spl::IsMariko();
        InitializeFrameBuffer();

        /* Turn on DSI/voltage rail. */
        {
            i2c::driver::Session i2c_session;
            i2c::driver::Initialize();
            ON_SCOPE_EXIT { i2c::driver::Finalize(); };

            i2c::driver::OpenSession(&i2c_session, I2cDevice_Max77620Pmic);

            if (g_is_mariko) {
                WriteI2cRegister(i2c_session, 0x18, 0x3A);
                WriteI2cRegister(i2c_session, 0x1F, 0x71);
            }
            WriteI2cRegister(i2c_session, 0x23, 0xD0);
        }

        /* Enable MIPI CAL, DSI, DISP1, HOST1X, UART_FST_MIPI_CAL, DSIA LP clocks. */
        reg::Write(g_clk_rst_regs + CLK_RST_CONTROLLER_RST_DEV_H_CLR, 0x1010000);
        reg::Write(g_clk_rst_regs + CLK_RST_CONTROLLER_CLK_ENB_H_SET, 0x1010000);
        reg::Write(g_clk_rst_regs + CLK_RST_CONTROLLER_RST_DEV_L_CLR, 0x18000000);
        reg::Write(g_clk_rst_regs + CLK_RST_CONTROLLER_CLK_ENB_L_SET, 0x18000000);
        reg::Write(g_clk_rst_regs + CLK_RST_CONTROLLER_CLK_ENB_X_SET, 0x20000);
        reg::Write(g_clk_rst_regs + CLK_RST_CONTROLLER_CLK_SOURCE_UART_FST_MIPI_CAL, 0xA);
        reg::Write(g_clk_rst_regs + CLK_RST_CONTROLLER_CLK_ENB_W_SET, 0x80000);
        reg::Write(g_clk_rst_regs + CLK_RST_CONTROLLER_CLK_SOURCE_DSIA_LP, 0xA);

        /* DPD idle. */
        WritePmcRegister(PmcBase + APBDEV_PMC_IO_DPD_REQ, 0x40000000);
        WritePmcRegister(PmcBase + APBDEV_PMC_IO_DPD2_REQ, 0x40000000);

        /* Configure LCD pinmux tristate + passthrough. */
        reg::ClearBits(g_apb_misc_regs + 0x3000 + PINMUX_AUX_NFC_EN, PINMUX_TRISTATE);
        reg::ClearBits(g_apb_misc_regs + 0x3000 + PINMUX_AUX_NFC_INT, PINMUX_TRISTATE);
        reg::ClearBits(g_apb_misc_regs + 0x3000 + PINMUX_AUX_LCD_BL_PWM, PINMUX_TRISTATE);
        reg::ClearBits(g_apb_misc_regs + 0x3000 + PINMUX_AUX_LCD_BL_EN, PINMUX_TRISTATE);
        reg::ClearBits(g_apb_misc_regs + 0x3000 + PINMUX_AUX_LCD_RST, PINMUX_TRISTATE);

        /* Configure LCD power, VDD. */
        reg::SetBits(g_gpio_regs + GPIO_PORT3_CNF_0, 0x3);
        reg::SetBits(g_gpio_regs + GPIO_PORT3_OE_0,  0x3);
        reg::SetBits(g_gpio_regs + GPIO_PORT3_OUT_0, 0x1);
        svcSleepThread(10'000'000ul);
        reg::SetBits(g_gpio_regs + GPIO_PORT3_OUT_0, 0x2);
        svcSleepThread(10'000'000ul);

        /* Configure LCD backlight. */
        reg::SetBits(g_gpio_regs + GPIO_PORT6_CNF_1, 0x7);
        reg::SetBits(g_gpio_regs + GPIO_PORT6_OE_1,  0x7);
        reg::SetBits(g_gpio_regs + GPIO_PORT6_OUT_1, 0x2);

        /* Configure display interface and display. */
        reg::Write(g_mipi_cal_regs + 0x060, 0);
        if (g_is_mariko) {
            reg::Write(g_mipi_cal_regs + 0x058, 0);
            reg::Write(g_apb_misc_regs + 0xAC0, 0);
        }

        /* Execute configs. */
        DO_SOC_DEPENDENT_REGISTER_WRITES(g_clk_rst_regs, DisplayConfigPlld01);
        DO_REGISTER_WRITES(g_disp1_regs, DisplayConfigDc01);
        DO_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsi01Init01);
        /* NOTE: Nintendo bug here. */
        /* As of 8.0.0, Nintendo writes this list to CAR instead of DSI */
        /* This results in them zeroing CLK_SOURCE_UARTA... */
        DO_SOC_DEPENDENT_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsi01Init02);
        DO_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsi01Init03);
        DO_SOC_DEPENDENT_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsi01Init04);
        DO_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsi01Init05);
        DO_SOC_DEPENDENT_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsiPhyTiming);
        DO_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsi01Init06);
        DO_SOC_DEPENDENT_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsiPhyTiming);
        DO_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsi01Init07);

        svcSleepThread(10'000'000ul);

        /* Enable backlight reset. */
        reg::SetBits(g_gpio_regs + GPIO_PORT6_OUT_1, 0x4);
        svcSleepThread(60'000'000ul);

        reg::Write(g_dsi_regs + sizeof(u32) * DSI_BTA_TIMING, 0x50204);
        reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x337);
        reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
        WaitDsiTrigger();

        reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x406);
        reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
        WaitDsiTrigger();

        reg::Write(g_dsi_regs + sizeof(u32) * DSI_HOST_CONTROL, DSI_HOST_CONTROL_TX_TRIG_HOST | DSI_HOST_CONTROL_IMM_BTA | DSI_HOST_CONTROL_CS | DSI_HOST_CONTROL_ECC);
        WaitDsiHostControl();
        svcSleepThread(5'000'000ul);

        /* Parse LCD vendor. */
        {
            u32 host_response[3];
            for (size_t i = 0; i < util::size(host_response); i++) {
                host_response[i] = reg::Read(g_dsi_regs + sizeof(u32) * DSI_RD_DATA);
            }

            /* The last word from host response is:
                Bits 0-7: FAB
                Bits 8-15: REV
                Bits 16-23: Minor REV
            */
            if ((host_response[2] & 0xFF) == 0x10) {
                g_lcd_vendor = 0;
            } else {
                g_lcd_vendor = (host_response[2] >> 8) & 0xFF00;
            }
            g_lcd_vendor = (g_lcd_vendor & 0xFFFFFF00) | (host_response[2] & 0xFF);
        }

        /* LCD vendor specific configuration. */
        switch (g_lcd_vendor) {
            case 0xF30: /* AUO first revision screens. */
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x1105);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
                svcSleepThread(180'000'000ul);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x439);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x9483FFB9);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
                svcSleepThread(5'000'000ul);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x739);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x711148B1);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x143209);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
                svcSleepThread(5'000'000ul);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x2905);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
                break;
            case 0xF20: /* Innolux first revision screens. */
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x1105);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
                svcSleepThread(180'000'000ul);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x439);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x9483FFB9);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
                svcSleepThread(5'000'000ul);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x739);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x751548B1);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x143209);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
                svcSleepThread(5'000'000ul);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x2905);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
                break;
            case 0x10: /* Japan Display Inc screens. */
                DO_DSI_SLEEP_OR_REGISTER_WRITES(DisplayConfigJdiSpecificInit01);
                break;
            default:
                /* Innolux and AUO second revision screens. */
                if ((g_lcd_vendor | 0x10) == 0x1030) {
                    reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x1105);
                    reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
                    svcSleepThread(120'000'000ul);
                    reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x2905);
                    reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
                }
                break;
        }
        svcSleepThread(20'000'000ul);

        DO_SOC_DEPENDENT_REGISTER_WRITES(g_clk_rst_regs, DisplayConfigPlld02);
        DO_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsi01Init08);
        DO_SOC_DEPENDENT_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsiPhyTiming);
        DO_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsi01Init09);

        reg::Write(g_disp1_regs + sizeof(u32) * DC_DISP_DISP_CLOCK_CONTROL, SHIFT_CLK_DIVIDER(4));
        DO_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsi01Init10);
        svcSleepThread(10'000'000ul);

        /* Configure MIPI CAL. */
        DO_REGISTER_WRITES(g_mipi_cal_regs, DisplayConfigMipiCal01);
        DO_SOC_DEPENDENT_REGISTER_WRITES(g_mipi_cal_regs, DisplayConfigMipiCal02);
        DO_SOC_DEPENDENT_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsi01Init11);
        DO_SOC_DEPENDENT_REGISTER_WRITES(g_mipi_cal_regs, DisplayConfigMipiCal03);
        DO_REGISTER_WRITES(g_mipi_cal_regs, DisplayConfigMipiCal04);
        if (g_is_mariko) {
            /* On Mariko the above configurations are executed twice, for some reason. */
            DO_SOC_DEPENDENT_REGISTER_WRITES(g_mipi_cal_regs, DisplayConfigMipiCal02);
            DO_SOC_DEPENDENT_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsi01Init11);
            DO_SOC_DEPENDENT_REGISTER_WRITES(g_mipi_cal_regs, DisplayConfigMipiCal03);
            DO_REGISTER_WRITES(g_mipi_cal_regs, DisplayConfigMipiCal04);
        }
        svcSleepThread(10'000'000ul);

        /* Write DISP1, FrameBuffer config. */
        DO_REGISTER_WRITES(g_disp1_regs, DisplayConfigDc02);
        DO_REGISTER_WRITES(g_disp1_regs, DisplayConfigFrameBuffer);
        svcSleepThread(35'000'000ul);
        g_is_display_intialized = true;
    }

    void ShowDisplay(size_t x, size_t y, size_t width, size_t height, const u32 *img) {
        if (!g_is_display_intialized) {
            return;
        }

        /* Draw the image to the screen. */
        std::memset(g_frame_buffer, 0, FrameBufferSize);
        {
            for (size_t cur_y = 0; cur_y < height; cur_y++) {
                for (size_t cur_x = 0; cur_x < width; cur_x++) {
                    g_frame_buffer[(FrameBufferHeight - (x + cur_x)) * FrameBufferWidth + y + cur_y] = img[cur_y * width + cur_x];
                }
            }
        }
        armDCacheFlush(g_frame_buffer, FrameBufferSize);

        /* Enable backlight. */
        reg::SetBits(g_gpio_regs + GPIO_PORT6_OUT_1, 0x1);
    }

    void FinalizeDisplay() {
        if (!g_is_display_intialized) {
            return;
        }

        /* Disable backlight. */
        reg::ClearBits(g_gpio_regs + GPIO_PORT6_OUT_1, 0x1);

        reg::Write(g_disp1_regs + sizeof(u32) * DSI_VIDEO_MODE_CONTROL, 1);
        reg::Write(g_disp1_regs + sizeof(u32) * DSI_WR_DATA, 0x2805);

        /* Nintendo waits 5 frames before continuing. */
        {
            const uintptr_t host1x_vaddr = dd::GetIoMapping(0x500030a4, 4);
            const u32 start_val = reg::Read(host1x_vaddr);
            while (reg::Read(host1x_vaddr) < start_val + 5) {
                /* spinlock here. */
            }
        }

        reg::Write(g_disp1_regs + sizeof(u32) * DC_CMD_STATE_ACCESS, (READ_MUX | WRITE_MUX));
        reg::Write(g_disp1_regs + sizeof(u32) * DSI_VIDEO_MODE_CONTROL, 0);


        DO_SOC_DEPENDENT_REGISTER_WRITES(g_clk_rst_regs, DisplayConfigPlld01);
        DO_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsi01Fini01);
        DO_SOC_DEPENDENT_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsiPhyTiming);
        DO_REGISTER_WRITES(g_dsi_regs, DisplayConfigDsi01Fini02);

        svcSleepThread(10'000'000ul);

        /* Vendor specific shutdown. */
        switch (g_lcd_vendor) {
            case 0x10:   /* Japan Display Inc screens. */
                DO_REGISTER_WRITES(g_dsi_regs, DisplayConfigJdiSpecificFini01);
                break;
            case 0xF30:  /* AUO first revision screens. */
                DO_REGISTER_WRITES(g_dsi_regs, DisplayConfigAuoRev1SpecificFini01);
                svcSleepThread(5'000'000ul);
                break;
            case 0x1020: /* Innolux second revision screens. */
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x439);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x9483FFB9);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
                svcSleepThread(5'000'000ul);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0xB39);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x751548B1);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x71143209);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x115631);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
                svcSleepThread(5'000'000ul);
                break;
            case 0x1030: /* AUO second revision screens. */
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x439);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x9483FFB9);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
                svcSleepThread(5'000'000ul);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0xB39);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x711148B1);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x71143209);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x114D31);
                reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
                svcSleepThread(5'000'000ul);
                break;
            default:
                break;
        }
        svcSleepThread(5'000'000ul);

        reg::Write(g_dsi_regs + sizeof(u32) * DSI_WR_DATA, 0x1005);
        reg::Write(g_dsi_regs + sizeof(u32) * DSI_TRIGGER, DSI_TRIGGER_HOST);
        svcSleepThread(50'000'000ul);

        /* Disable backlight RST/Voltage. */
        reg::ClearBits(g_gpio_regs + GPIO_PORT6_OUT_1, 0x4);
        svcSleepThread(10'000'000ul);
        reg::ClearBits(g_gpio_regs + GPIO_PORT3_OUT_0, 0x2);
        svcSleepThread(10'000'000ul);
        reg::ClearBits(g_gpio_regs + GPIO_PORT3_OUT_0, 0x1);
        svcSleepThread(10'000'000ul);

        /* Cut clock to DSI. */
        reg::Write(g_clk_rst_regs + CLK_RST_CONTROLLER_RST_DEV_H_SET, 0x1010000);
        reg::Write(g_clk_rst_regs + CLK_RST_CONTROLLER_CLK_ENB_H_CLR, 0x1010000);
        reg::Write(g_clk_rst_regs + CLK_RST_CONTROLLER_RST_DEV_L_SET, 0x18000000);
        reg::Write(g_clk_rst_regs + CLK_RST_CONTROLLER_CLK_ENB_L_CLR, 0x18000000);
        reg::Write(g_dsi_regs + sizeof(u32) * DSI_PAD_CONTROL_0, (DSI_PAD_CONTROL_VS1_PULLDN_CLK | DSI_PAD_CONTROL_VS1_PULLDN(0xF) | DSI_PAD_CONTROL_VS1_PDIO_CLK | DSI_PAD_CONTROL_VS1_PDIO(0xF)));
        reg::Write(g_dsi_regs + sizeof(u32) * DSI_POWER_CONTROL, 0);

        /* Final LCD config for PWM */
        reg::ClearBits(g_gpio_regs + GPIO_PORT6_CNF_1, 0x1);
        reg::SetBits(g_apb_misc_regs + 0x3000 + PINMUX_AUX_LCD_BL_PWM, PINMUX_TRISTATE);
        reg::ReadWrite(g_apb_misc_regs + 0x3000 + PINMUX_AUX_LCD_BL_PWM, 1, 0x3);

        /* Unmap framebuffer from DC virtual address space. */
        FinalizeFrameBuffer();
        g_is_display_intialized = false;
    }

}