// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2012 Avionic Design GmbH
 * Copyright (C) 2012 NVIDIA CORPORATION.  All rights reserved.
 */

#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/iommu.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>

#include <soc/tegra/pmc.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_debugfs.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_vblank.h>

#include "dc.h"
#include "drm.h"
#include "gem.h"
#include "hub.h"
#include "plane.h"

static void tegra_crtc_atomic_destroy_state(struct drm_crtc *crtc,
                                            struct drm_crtc_state *state);

static void tegra_dc_stats_reset(struct tegra_dc_stats *stats)
{
        stats->frames = 0;
        stats->vblank = 0;
        stats->underflow = 0;
        stats->overflow = 0;
}

/* Reads the active copy of a register. */
static u32 tegra_dc_readl_active(struct tegra_dc *dc, unsigned long offset)
{
        u32 value;

        tegra_dc_writel(dc, READ_MUX, DC_CMD_STATE_ACCESS);
        value = tegra_dc_readl(dc, offset);
        tegra_dc_writel(dc, 0, DC_CMD_STATE_ACCESS);

        return value;
}

static inline unsigned int tegra_plane_offset(struct tegra_plane *plane,
                                              unsigned int offset)
{
        if (offset >= 0x500 && offset <= 0x638) {
                offset = 0x000 + (offset - 0x500);
                return plane->offset + offset;
        }

        if (offset >= 0x700 && offset <= 0x719) {
                offset = 0x180 + (offset - 0x700);
                return plane->offset + offset;
        }

        if (offset >= 0x800 && offset <= 0x839) {
                offset = 0x1c0 + (offset - 0x800);
                return plane->offset + offset;
        }

        dev_WARN(plane->dc->dev, "invalid offset: %x\n", offset);

        return plane->offset + offset;
}

static inline u32 tegra_plane_readl(struct tegra_plane *plane,
                                    unsigned int offset)
{
        return tegra_dc_readl(plane->dc, tegra_plane_offset(plane, offset));
}

static inline void tegra_plane_writel(struct tegra_plane *plane, u32 value,
                                      unsigned int offset)
{
        tegra_dc_writel(plane->dc, value, tegra_plane_offset(plane, offset));
}

bool tegra_dc_has_output(struct tegra_dc *dc, struct device *dev)
{
        struct device_node *np = dc->dev->of_node;
        struct of_phandle_iterator it;
        int err;

        of_for_each_phandle(&it, err, np, "nvidia,outputs", NULL, 0)
                if (it.node == dev->of_node)
                        return true;

        return false;
}

/*
 * Double-buffered registers have two copies: ASSEMBLY and ACTIVE. When the
 * *_ACT_REQ bits are set the ASSEMBLY copy is latched into the ACTIVE copy.
 * Latching happens mmediately if the display controller is in STOP mode or
 * on the next frame boundary otherwise.
 *
 * Triple-buffered registers have three copies: ASSEMBLY, ARM and ACTIVE. The
 * ASSEMBLY copy is latched into the ARM copy immediately after *_UPDATE bits
 * are written. When the *_ACT_REQ bits are written, the ARM copy is latched
 * into the ACTIVE copy, either immediately if the display controller is in
 * STOP mode, or at the next frame boundary otherwise.
 */
void tegra_dc_commit(struct tegra_dc *dc)
{
        tegra_dc_writel(dc, GENERAL_ACT_REQ << 8, DC_CMD_STATE_CONTROL);
        tegra_dc_writel(dc, GENERAL_ACT_REQ, DC_CMD_STATE_CONTROL);
}

static inline u32 compute_dda_inc(unsigned int in, unsigned int out, bool v,
                                  unsigned int bpp)
{
        fixed20_12 outf = dfixed_init(out);
        fixed20_12 inf = dfixed_init(in);
        u32 dda_inc;
        int max;

        if (v)
                max = 15;
        else {
                switch (bpp) {
                case 2:
                        max = 8;
                        break;

                default:
                        WARN_ON_ONCE(1);
                        fallthrough;
                case 4:
                        max = 4;
                        break;
                }
        }

        outf.full = max_t(u32, outf.full - dfixed_const(1), dfixed_const(1));
        inf.full -= dfixed_const(1);

        dda_inc = dfixed_div(inf, outf);
        dda_inc = min_t(u32, dda_inc, dfixed_const(max));

        return dda_inc;
}

static inline u32 compute_initial_dda(unsigned int in)
{
        fixed20_12 inf = dfixed_init(in);
        return dfixed_frac(inf);
}

static void tegra_plane_setup_blending_legacy(struct tegra_plane *plane)
{
        u32 background[3] = {
                BLEND_WEIGHT1(0) | BLEND_WEIGHT0(0) | BLEND_COLOR_KEY_NONE,
                BLEND_WEIGHT1(0) | BLEND_WEIGHT0(0) | BLEND_COLOR_KEY_NONE,
                BLEND_WEIGHT1(0) | BLEND_WEIGHT0(0) | BLEND_COLOR_KEY_NONE,
        };
        u32 foreground = BLEND_WEIGHT1(255) | BLEND_WEIGHT0(255) |
                         BLEND_COLOR_KEY_NONE;
        u32 blendnokey = BLEND_WEIGHT1(255) | BLEND_WEIGHT0(255);
        struct tegra_plane_state *state;
        u32 blending[2];
        unsigned int i;

        /* disable blending for non-overlapping case */
        tegra_plane_writel(plane, blendnokey, DC_WIN_BLEND_NOKEY);
        tegra_plane_writel(plane, foreground, DC_WIN_BLEND_1WIN);

        state = to_tegra_plane_state(plane->base.state);

        if (state->opaque) {
                /*
                 * Since custom fix-weight blending isn't utilized and weight
                 * of top window is set to max, we can enforce dependent
                 * blending which in this case results in transparent bottom
                 * window if top window is opaque and if top window enables
                 * alpha blending, then bottom window is getting alpha value
                 * of 1 minus the sum of alpha components of the overlapping
                 * plane.
                 */
                background[0] |= BLEND_CONTROL_DEPENDENT;
                background[1] |= BLEND_CONTROL_DEPENDENT;

                /*
                 * The region where three windows overlap is the intersection
                 * of the two regions where two windows overlap. It contributes
                 * to the area if all of the windows on top of it have an alpha
                 * component.
                 */
                switch (state->base.normalized_zpos) {
                case 0:
                        if (state->blending[0].alpha &&
                            state->blending[1].alpha)
                                background[2] |= BLEND_CONTROL_DEPENDENT;
                        break;

                case 1:
                        background[2] |= BLEND_CONTROL_DEPENDENT;
                        break;
                }
        } else {
                /*
                 * Enable alpha blending if pixel format has an alpha
                 * component.
                 */
                foreground |= BLEND_CONTROL_ALPHA;

                /*
                 * If any of the windows on top of this window is opaque, it
                 * will completely conceal this window within that area. If
                 * top window has an alpha component, it is blended over the
                 * bottom window.
                 */
                for (i = 0; i < 2; i++) {
                        if (state->blending[i].alpha &&
                            state->blending[i].top)
                                background[i] |= BLEND_CONTROL_DEPENDENT;
                }

                switch (state->base.normalized_zpos) {
                case 0:
                        if (state->blending[0].alpha &&
                            state->blending[1].alpha)
                                background[2] |= BLEND_CONTROL_DEPENDENT;
                        break;

                case 1:
                        /*
                         * When both middle and topmost windows have an alpha,
                         * these windows a mixed together and then the result
                         * is blended over the bottom window.
                         */
                        if (state->blending[0].alpha &&
                            state->blending[0].top)
                                background[2] |= BLEND_CONTROL_ALPHA;

                        if (state->blending[1].alpha &&
                            state->blending[1].top)
                                background[2] |= BLEND_CONTROL_ALPHA;
                        break;
                }
        }

        switch (state->base.normalized_zpos) {
        case 0:
                tegra_plane_writel(plane, background[0], DC_WIN_BLEND_2WIN_X);
                tegra_plane_writel(plane, background[1], DC_WIN_BLEND_2WIN_Y);
                tegra_plane_writel(plane, background[2], DC_WIN_BLEND_3WIN_XY);
                break;

        case 1:
                /*
                 * If window B / C is topmost, then X / Y registers are
                 * matching the order of blending[...] state indices,
                 * otherwise a swap is required.
                 */
                if (!state->blending[0].top && state->blending[1].top) {
                        blending[0] = foreground;
                        blending[1] = background[1];
                } else {
                        blending[0] = background[0];
                        blending[1] = foreground;
                }

                tegra_plane_writel(plane, blending[0], DC_WIN_BLEND_2WIN_X);
                tegra_plane_writel(plane, blending[1], DC_WIN_BLEND_2WIN_Y);
                tegra_plane_writel(plane, background[2], DC_WIN_BLEND_3WIN_XY);
                break;

        case 2:
                tegra_plane_writel(plane, foreground, DC_WIN_BLEND_2WIN_X);
                tegra_plane_writel(plane, foreground, DC_WIN_BLEND_2WIN_Y);
                tegra_plane_writel(plane, foreground, DC_WIN_BLEND_3WIN_XY);
                break;
        }
}

static void tegra_plane_setup_blending(struct tegra_plane *plane,
                                       const struct tegra_dc_window *window)
{
        u32 value;

        value = BLEND_FACTOR_DST_ALPHA_ZERO | BLEND_FACTOR_SRC_ALPHA_K2 |
                BLEND_FACTOR_DST_COLOR_NEG_K1_TIMES_SRC |
                BLEND_FACTOR_SRC_COLOR_K1_TIMES_SRC;
        tegra_plane_writel(plane, value, DC_WIN_BLEND_MATCH_SELECT);

        value = BLEND_FACTOR_DST_ALPHA_ZERO | BLEND_FACTOR_SRC_ALPHA_K2 |
                BLEND_FACTOR_DST_COLOR_NEG_K1_TIMES_SRC |
                BLEND_FACTOR_SRC_COLOR_K1_TIMES_SRC;
        tegra_plane_writel(plane, value, DC_WIN_BLEND_NOMATCH_SELECT);

        value = K2(255) | K1(255) | WINDOW_LAYER_DEPTH(255 - window->zpos);
        tegra_plane_writel(plane, value, DC_WIN_BLEND_LAYER_CONTROL);
}

static bool
tegra_plane_use_horizontal_filtering(struct tegra_plane *plane,
                                     const struct tegra_dc_window *window)
{
        struct tegra_dc *dc = plane->dc;

        if (window->src.w == window->dst.w)
                return false;

        if (plane->index == 0 && dc->soc->has_win_a_without_filters)
                return false;

        return true;
}

static bool
tegra_plane_use_vertical_filtering(struct tegra_plane *plane,
                                   const struct tegra_dc_window *window)
{
        struct tegra_dc *dc = plane->dc;

        if (window->src.h == window->dst.h)
                return false;

        if (plane->index == 0 && dc->soc->has_win_a_without_filters)
                return false;

        if (plane->index == 2 && dc->soc->has_win_c_without_vert_filter)
                return false;

        return true;
}

static void tegra_dc_setup_window(struct tegra_plane *plane,
                                  const struct tegra_dc_window *window)
{
        unsigned h_offset, v_offset, h_size, v_size, h_dda, v_dda, bpp;
        struct tegra_dc *dc = plane->dc;
        bool yuv, planar;
        u32 value;

        /*
         * For YUV planar modes, the number of bytes per pixel takes into
         * account only the luma component and therefore is 1.
         */
        yuv = tegra_plane_format_is_yuv(window->format, &planar);
        if (!yuv)
                bpp = window->bits_per_pixel / 8;
        else
                bpp = planar ? 1 : 2;

        tegra_plane_writel(plane, window->format, DC_WIN_COLOR_DEPTH);
        tegra_plane_writel(plane, window->swap, DC_WIN_BYTE_SWAP);

        value = V_POSITION(window->dst.y) | H_POSITION(window->dst.x);
        tegra_plane_writel(plane, value, DC_WIN_POSITION);

        value = V_SIZE(window->dst.h) | H_SIZE(window->dst.w);
        tegra_plane_writel(plane, value, DC_WIN_SIZE);

        h_offset = window->src.x * bpp;
        v_offset = window->src.y;
        h_size = window->src.w * bpp;
        v_size = window->src.h;

        if (window->reflect_x)
                h_offset += (window->src.w - 1) * bpp;

        if (window->reflect_y)
                v_offset += window->src.h - 1;

        value = V_PRESCALED_SIZE(v_size) | H_PRESCALED_SIZE(h_size);
        tegra_plane_writel(plane, value, DC_WIN_PRESCALED_SIZE);

        /*
         * For DDA computations the number of bytes per pixel for YUV planar
         * modes needs to take into account all Y, U and V components.
         */
        if (yuv && planar)
                bpp = 2;

        h_dda = compute_dda_inc(window->src.w, window->dst.w, false, bpp);
        v_dda = compute_dda_inc(window->src.h, window->dst.h, true, bpp);

        value = V_DDA_INC(v_dda) | H_DDA_INC(h_dda);
        tegra_plane_writel(plane, value, DC_WIN_DDA_INC);

        h_dda = compute_initial_dda(window->src.x);
        v_dda = compute_initial_dda(window->src.y);

        tegra_plane_writel(plane, h_dda, DC_WIN_H_INITIAL_DDA);
        tegra_plane_writel(plane, v_dda, DC_WIN_V_INITIAL_DDA);

        tegra_plane_writel(plane, 0, DC_WIN_UV_BUF_STRIDE);
        tegra_plane_writel(plane, 0, DC_WIN_BUF_STRIDE);

        tegra_plane_writel(plane, window->base[0], DC_WINBUF_START_ADDR);

        if (yuv && planar) {
                tegra_plane_writel(plane, window->base[1], DC_WINBUF_START_ADDR_U);
                tegra_plane_writel(plane, window->base[2], DC_WINBUF_START_ADDR_V);
                value = window->stride[1] << 16 | window->stride[0];
                tegra_plane_writel(plane, value, DC_WIN_LINE_STRIDE);
        } else {
                tegra_plane_writel(plane, window->stride[0], DC_WIN_LINE_STRIDE);
        }

        tegra_plane_writel(plane, h_offset, DC_WINBUF_ADDR_H_OFFSET);
        tegra_plane_writel(plane, v_offset, DC_WINBUF_ADDR_V_OFFSET);

        if (dc->soc->supports_block_linear) {
                unsigned long height = window->tiling.value;

                switch (window->tiling.mode) {
                case TEGRA_BO_TILING_MODE_PITCH:
                        value = DC_WINBUF_SURFACE_KIND_PITCH;
                        break;

                case TEGRA_BO_TILING_MODE_TILED:
                        value = DC_WINBUF_SURFACE_KIND_TILED;
                        break;

                case TEGRA_BO_TILING_MODE_BLOCK:
                        value = DC_WINBUF_SURFACE_KIND_BLOCK_HEIGHT(height) |
                                DC_WINBUF_SURFACE_KIND_BLOCK;
                        break;
                }

                tegra_plane_writel(plane, value, DC_WINBUF_SURFACE_KIND);
        } else {
                switch (window->tiling.mode) {
                case TEGRA_BO_TILING_MODE_PITCH:
                        value = DC_WIN_BUFFER_ADDR_MODE_LINEAR_UV |
                                DC_WIN_BUFFER_ADDR_MODE_LINEAR;
                        break;

                case TEGRA_BO_TILING_MODE_TILED:
                        value = DC_WIN_BUFFER_ADDR_MODE_TILE_UV |
                                DC_WIN_BUFFER_ADDR_MODE_TILE;
                        break;

                case TEGRA_BO_TILING_MODE_BLOCK:
                        /*
                         * No need to handle this here because ->atomic_check
                         * will already have filtered it out.
                         */
                        break;
                }

                tegra_plane_writel(plane, value, DC_WIN_BUFFER_ADDR_MODE);
        }

        value = WIN_ENABLE;

        if (yuv) {
                /* setup default colorspace conversion coefficients */
                tegra_plane_writel(plane, 0x00f0, DC_WIN_CSC_YOF);
                tegra_plane_writel(plane, 0x012a, DC_WIN_CSC_KYRGB);
                tegra_plane_writel(plane, 0x0000, DC_WIN_CSC_KUR);
                tegra_plane_writel(plane, 0x0198, DC_WIN_CSC_KVR);
                tegra_plane_writel(plane, 0x039b, DC_WIN_CSC_KUG);
                tegra_plane_writel(plane, 0x032f, DC_WIN_CSC_KVG);
                tegra_plane_writel(plane, 0x0204, DC_WIN_CSC_KUB);
                tegra_plane_writel(plane, 0x0000, DC_WIN_CSC_KVB);

                value |= CSC_ENABLE;
        } else if (window->bits_per_pixel < 24) {
                value |= COLOR_EXPAND;
        }

        if (window->reflect_x)
                value |= H_DIRECTION;

        if (window->reflect_y)
                value |= V_DIRECTION;

        if (tegra_plane_use_horizontal_filtering(plane, window)) {
                /*
                 * Enable horizontal 6-tap filter and set filtering
                 * coefficients to the default values defined in TRM.
                 */
                tegra_plane_writel(plane, 0x00008000, DC_WIN_H_FILTER_P(0));
                tegra_plane_writel(plane, 0x3e087ce1, DC_WIN_H_FILTER_P(1));
                tegra_plane_writel(plane, 0x3b117ac1, DC_WIN_H_FILTER_P(2));
                tegra_plane_writel(plane, 0x591b73aa, DC_WIN_H_FILTER_P(3));
                tegra_plane_writel(plane, 0x57256d9a, DC_WIN_H_FILTER_P(4));
                tegra_plane_writel(plane, 0x552f668b, DC_WIN_H_FILTER_P(5));
                tegra_plane_writel(plane, 0x73385e8b, DC_WIN_H_FILTER_P(6));
                tegra_plane_writel(plane, 0x72435583, DC_WIN_H_FILTER_P(7));
                tegra_plane_writel(plane, 0x714c4c8b, DC_WIN_H_FILTER_P(8));
                tegra_plane_writel(plane, 0x70554393, DC_WIN_H_FILTER_P(9));
                tegra_plane_writel(plane, 0x715e389b, DC_WIN_H_FILTER_P(10));
                tegra_plane_writel(plane, 0x71662faa, DC_WIN_H_FILTER_P(11));
                tegra_plane_writel(plane, 0x536d25ba, DC_WIN_H_FILTER_P(12));
                tegra_plane_writel(plane, 0x55731bca, DC_WIN_H_FILTER_P(13));
                tegra_plane_writel(plane, 0x387a11d9, DC_WIN_H_FILTER_P(14));
                tegra_plane_writel(plane, 0x3c7c08f1, DC_WIN_H_FILTER_P(15));

                value |= H_FILTER;
        }

        if (tegra_plane_use_vertical_filtering(plane, window)) {
                unsigned int i, k;

                /*
                 * Enable vertical 2-tap filter and set filtering
                 * coefficients to the default values defined in TRM.
                 */
                for (i = 0, k = 128; i < 16; i++, k -= 8)
                        tegra_plane_writel(plane, k, DC_WIN_V_FILTER_P(i));

                value |= V_FILTER;
        }

        tegra_plane_writel(plane, value, DC_WIN_WIN_OPTIONS);

        if (dc->soc->has_legacy_blending)
                tegra_plane_setup_blending_legacy(plane);
        else
                tegra_plane_setup_blending(plane, window);
}

static const u32 tegra20_primary_formats[] = {
        DRM_FORMAT_ARGB4444,
        DRM_FORMAT_ARGB1555,
        DRM_FORMAT_RGB565,
        DRM_FORMAT_RGBA5551,
        DRM_FORMAT_ABGR8888,
        DRM_FORMAT_ARGB8888,
        /* non-native formats */
        DRM_FORMAT_XRGB1555,
        DRM_FORMAT_RGBX5551,
        DRM_FORMAT_XBGR8888,
        DRM_FORMAT_XRGB8888,
};

static const u64 tegra20_modifiers[] = {
        DRM_FORMAT_MOD_LINEAR,
        DRM_FORMAT_MOD_NVIDIA_TEGRA_TILED,
        DRM_FORMAT_MOD_INVALID
};

static const u32 tegra114_primary_formats[] = {
        DRM_FORMAT_ARGB4444,
        DRM_FORMAT_ARGB1555,
        DRM_FORMAT_RGB565,
        DRM_FORMAT_RGBA5551,
        DRM_FORMAT_ABGR8888,
        DRM_FORMAT_ARGB8888,
        /* new on Tegra114 */
        DRM_FORMAT_ABGR4444,
        DRM_FORMAT_ABGR1555,
        DRM_FORMAT_BGRA5551,
        DRM_FORMAT_XRGB1555,
        DRM_FORMAT_RGBX5551,
        DRM_FORMAT_XBGR1555,
        DRM_FORMAT_BGRX5551,
        DRM_FORMAT_BGR565,
        DRM_FORMAT_BGRA8888,
        DRM_FORMAT_RGBA8888,
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_XBGR8888,
};

static const u32 tegra124_primary_formats[] = {
        DRM_FORMAT_ARGB4444,
        DRM_FORMAT_ARGB1555,
        DRM_FORMAT_RGB565,
        DRM_FORMAT_RGBA5551,
        DRM_FORMAT_ABGR8888,
        DRM_FORMAT_ARGB8888,
        /* new on Tegra114 */
        DRM_FORMAT_ABGR4444,
        DRM_FORMAT_ABGR1555,
        DRM_FORMAT_BGRA5551,
        DRM_FORMAT_XRGB1555,
        DRM_FORMAT_RGBX5551,
        DRM_FORMAT_XBGR1555,
        DRM_FORMAT_BGRX5551,
        DRM_FORMAT_BGR565,
        DRM_FORMAT_BGRA8888,
        DRM_FORMAT_RGBA8888,
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_XBGR8888,
        /* new on Tegra124 */
        DRM_FORMAT_RGBX8888,
        DRM_FORMAT_BGRX8888,
};

static const u64 tegra124_modifiers[] = {
        DRM_FORMAT_MOD_LINEAR,
        DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(0),
        DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(1),
        DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(2),
        DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(3),
        DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(4),
        DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(5),
        DRM_FORMAT_MOD_INVALID
};

static int tegra_plane_atomic_check(struct drm_plane *plane,
                                    struct drm_plane_state *state)
{
        struct tegra_plane_state *plane_state = to_tegra_plane_state(state);
        unsigned int supported_rotation = DRM_MODE_ROTATE_0 |
                                          DRM_MODE_REFLECT_X |
                                          DRM_MODE_REFLECT_Y;
        unsigned int rotation = state->rotation;
        struct tegra_bo_tiling *tiling = &plane_state->tiling;
        struct tegra_plane *tegra = to_tegra_plane(plane);
        struct tegra_dc *dc = to_tegra_dc(state->crtc);
        int err;

        /* no need for further checks if the plane is being disabled */
        if (!state->crtc)
                return 0;

        err = tegra_plane_format(state->fb->format->format,
                                 &plane_state->format,
                                 &plane_state->swap);
        if (err < 0)
                return err;

        /*
         * Tegra20 and Tegra30 are special cases here because they support
         * only variants of specific formats with an alpha component, but not
         * the corresponding opaque formats. However, the opaque formats can
         * be emulated by disabling alpha blending for the plane.
         */
        if (dc->soc->has_legacy_blending) {
                err = tegra_plane_setup_legacy_state(tegra, plane_state);
                if (err < 0)
                        return err;
        }

        err = tegra_fb_get_tiling(state->fb, tiling);
        if (err < 0)
                return err;

        if (tiling->mode == TEGRA_BO_TILING_MODE_BLOCK &&
            !dc->soc->supports_block_linear) {
                DRM_ERROR("hardware doesn't support block linear mode\n");
                return -EINVAL;
        }

        /*
         * Older userspace used custom BO flag in order to specify the Y
         * reflection, while modern userspace uses the generic DRM rotation
         * property in order to achieve the same result.  The legacy BO flag
         * duplicates the DRM rotation property when both are set.
         */
        if (tegra_fb_is_bottom_up(state->fb))
                rotation |= DRM_MODE_REFLECT_Y;

        rotation = drm_rotation_simplify(rotation, supported_rotation);

        if (rotation & DRM_MODE_REFLECT_X)
                plane_state->reflect_x = true;
        else
                plane_state->reflect_x = false;

        if (rotation & DRM_MODE_REFLECT_Y)
                plane_state->reflect_y = true;
        else
                plane_state->reflect_y = false;

        /*
         * Tegra doesn't support different strides for U and V planes so we
         * error out if the user tries to display a framebuffer with such a
         * configuration.
         */
        if (state->fb->format->num_planes > 2) {
                if (state->fb->pitches[2] != state->fb->pitches[1]) {
                        DRM_ERROR("unsupported UV-plane configuration\n");
                        return -EINVAL;
                }
        }

        err = tegra_plane_state_add(tegra, state);
        if (err < 0)
                return err;

        return 0;
}

static void tegra_plane_atomic_disable(struct drm_plane *plane,
                                       struct drm_plane_state *old_state)
{
        struct tegra_plane *p = to_tegra_plane(plane);
        u32 value;

        /* rien ne va plus */
        if (!old_state || !old_state->crtc)
                return;

        value = tegra_plane_readl(p, DC_WIN_WIN_OPTIONS);
        value &= ~WIN_ENABLE;
        tegra_plane_writel(p, value, DC_WIN_WIN_OPTIONS);
}

static void tegra_plane_atomic_update(struct drm_plane *plane,
                                      struct drm_plane_state *old_state)
{
        struct tegra_plane_state *state = to_tegra_plane_state(plane->state);
        struct drm_framebuffer *fb = plane->state->fb;
        struct tegra_plane *p = to_tegra_plane(plane);
        struct tegra_dc_window window;
        unsigned int i;

        /* rien ne va plus */
        if (!plane->state->crtc || !plane->state->fb)
                return;

        if (!plane->state->visible)
                return tegra_plane_atomic_disable(plane, old_state);

        memset(&window, 0, sizeof(window));
        window.src.x = plane->state->src.x1 >> 16;
        window.src.y = plane->state->src.y1 >> 16;
        window.src.w = drm_rect_width(&plane->state->src) >> 16;
        window.src.h = drm_rect_height(&plane->state->src) >> 16;
        window.dst.x = plane->state->dst.x1;
        window.dst.y = plane->state->dst.y1;
        window.dst.w = drm_rect_width(&plane->state->dst);
        window.dst.h = drm_rect_height(&plane->state->dst);
        window.bits_per_pixel = fb->format->cpp[0] * 8;
        window.reflect_x = state->reflect_x;
        window.reflect_y = state->reflect_y;

        /* copy from state */
        window.zpos = plane->state->normalized_zpos;
        window.tiling = state->tiling;
        window.format = state->format;
        window.swap = state->swap;

        for (i = 0; i < fb->format->num_planes; i++) {
                window.base[i] = state->iova[i] + fb->offsets[i];

                /*
                 * Tegra uses a shared stride for UV planes. Framebuffers are
                 * already checked for this in the tegra_plane_atomic_check()
                 * function, so it's safe to ignore the V-plane pitch here.
                 */
                if (i < 2)
                        window.stride[i] = fb->pitches[i];
        }

        tegra_dc_setup_window(p, &window);
}

static const struct drm_plane_helper_funcs tegra_plane_helper_funcs = {
        .prepare_fb = tegra_plane_prepare_fb,
        .cleanup_fb = tegra_plane_cleanup_fb,
        .atomic_check = tegra_plane_atomic_check,
        .atomic_disable = tegra_plane_atomic_disable,
        .atomic_update = tegra_plane_atomic_update,
};

static unsigned long tegra_plane_get_possible_crtcs(struct drm_device *drm)
{
        /*
         * Ideally this would use drm_crtc_mask(), but that would require the
         * CRTC to already be in the mode_config's list of CRTCs. However, it
         * will only be added to that list in the drm_crtc_init_with_planes()
         * (in tegra_dc_init()), which in turn requires registration of these
         * planes. So we have ourselves a nice little chicken and egg problem
         * here.
         *
         * We work around this by manually creating the mask from the number
         * of CRTCs that have been registered, and should therefore always be
         * the same as drm_crtc_index() after registration.
         */
        return 1 << drm->mode_config.num_crtc;
}

static struct drm_plane *tegra_primary_plane_create(struct drm_device *drm,
                                                    struct tegra_dc *dc)
{
        unsigned long possible_crtcs = tegra_plane_get_possible_crtcs(drm);
        enum drm_plane_type type = DRM_PLANE_TYPE_PRIMARY;
        struct tegra_plane *plane;
        unsigned int num_formats;
        const u64 *modifiers;
        const u32 *formats;
        int err;

        plane = kzalloc(sizeof(*plane), GFP_KERNEL);
        if (!plane)
                return ERR_PTR(-ENOMEM);

        /* Always use window A as primary window */
        plane->offset = 0xa00;
        plane->index = 0;
        plane->dc = dc;

        num_formats = dc->soc->num_primary_formats;
        formats = dc->soc->primary_formats;
        modifiers = dc->soc->modifiers;

        err = drm_universal_plane_init(drm, &plane->base, possible_crtcs,
                                       &tegra_plane_funcs, formats,
                                       num_formats, modifiers, type, NULL);
        if (err < 0) {
                kfree(plane);
                return ERR_PTR(err);
        }

        drm_plane_helper_add(&plane->base, &tegra_plane_helper_funcs);
        drm_plane_create_zpos_property(&plane->base, plane->index, 0, 255);

        err = drm_plane_create_rotation_property(&plane->base,
                                                 DRM_MODE_ROTATE_0,
                                                 DRM_MODE_ROTATE_0 |
                                                 DRM_MODE_ROTATE_180 |
                                                 DRM_MODE_REFLECT_X |
                                                 DRM_MODE_REFLECT_Y);
        if (err < 0)
                dev_err(dc->dev, "failed to create rotation property: %d\n",
                        err);

        return &plane->base;
}

static const u32 tegra_cursor_plane_formats[] = {
        DRM_FORMAT_RGBA8888,
};

static int tegra_cursor_atomic_check(struct drm_plane *plane,
                                     struct drm_plane_state *state)
{
        struct tegra_plane *tegra = to_tegra_plane(plane);
        int err;

        /* no need for further checks if the plane is being disabled */
        if (!state->crtc)
                return 0;

        /* scaling not supported for cursor */
        if ((state->src_w >> 16 != state->crtc_w) ||
            (state->src_h >> 16 != state->crtc_h))
                return -EINVAL;

        /* only square cursors supported */
        if (state->src_w != state->src_h)
                return -EINVAL;

        if (state->crtc_w != 32 && state->crtc_w != 64 &&
            state->crtc_w != 128 && state->crtc_w != 256)
                return -EINVAL;

        err = tegra_plane_state_add(tegra, state);
        if (err < 0)
                return err;

        return 0;
}

static void tegra_cursor_atomic_update(struct drm_plane *plane,
                                       struct drm_plane_state *old_state)
{
        struct tegra_plane_state *state = to_tegra_plane_state(plane->state);
        struct tegra_dc *dc = to_tegra_dc(plane->state->crtc);
        u32 value = CURSOR_CLIP_DISPLAY;

        /* rien ne va plus */
        if (!plane->state->crtc || !plane->state->fb)
                return;

        switch (plane->state->crtc_w) {
        case 32:
                value |= CURSOR_SIZE_32x32;
                break;

        case 64:
                value |= CURSOR_SIZE_64x64;
                break;

        case 128:
                value |= CURSOR_SIZE_128x128;
                break;

        case 256:
                value |= CURSOR_SIZE_256x256;
                break;

        default:
                WARN(1, "cursor size %ux%u not supported\n",
                     plane->state->crtc_w, plane->state->crtc_h);
                return;
        }

        value |= (state->iova[0] >> 10) & 0x3fffff;
        tegra_dc_writel(dc, value, DC_DISP_CURSOR_START_ADDR);

#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
        value = (state->iova[0] >> 32) & 0x3;
        tegra_dc_writel(dc, value, DC_DISP_CURSOR_START_ADDR_HI);
#endif

        /* enable cursor and set blend mode */
        value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
        value |= CURSOR_ENABLE;
        tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);

        value = tegra_dc_readl(dc, DC_DISP_BLEND_CURSOR_CONTROL);
        value &= ~CURSOR_DST_BLEND_MASK;
        value &= ~CURSOR_SRC_BLEND_MASK;
        value |= CURSOR_MODE_NORMAL;
        value |= CURSOR_DST_BLEND_NEG_K1_TIMES_SRC;
        value |= CURSOR_SRC_BLEND_K1_TIMES_SRC;
        value |= CURSOR_ALPHA;
        tegra_dc_writel(dc, value, DC_DISP_BLEND_CURSOR_CONTROL);

        /* position the cursor */
        value = (plane->state->crtc_y & 0x3fff) << 16 |
                (plane->state->crtc_x & 0x3fff);
        tegra_dc_writel(dc, value, DC_DISP_CURSOR_POSITION);
}

static void tegra_cursor_atomic_disable(struct drm_plane *plane,
                                        struct drm_plane_state *old_state)
{
        struct tegra_dc *dc;
        u32 value;

        /* rien ne va plus */
        if (!old_state || !old_state->crtc)
                return;

        dc = to_tegra_dc(old_state->crtc);

        value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
        value &= ~CURSOR_ENABLE;
        tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
}

static const struct drm_plane_helper_funcs tegra_cursor_plane_helper_funcs = {
        .prepare_fb = tegra_plane_prepare_fb,
        .cleanup_fb = tegra_plane_cleanup_fb,
        .atomic_check = tegra_cursor_atomic_check,
        .atomic_update = tegra_cursor_atomic_update,
        .atomic_disable = tegra_cursor_atomic_disable,
};

static struct drm_plane *tegra_dc_cursor_plane_create(struct drm_device *drm,
                                                      struct tegra_dc *dc)
{
        unsigned long possible_crtcs = tegra_plane_get_possible_crtcs(drm);
        struct tegra_plane *plane;
        unsigned int num_formats;
        const u32 *formats;
        int err;

        plane = kzalloc(sizeof(*plane), GFP_KERNEL);
        if (!plane)
                return ERR_PTR(-ENOMEM);

        /*
         * This index is kind of fake. The cursor isn't a regular plane, but
         * its update and activation request bits in DC_CMD_STATE_CONTROL do
         * use the same programming. Setting this fake index here allows the
         * code in tegra_add_plane_state() to do the right thing without the
         * need to special-casing the cursor plane.
         */
        plane->index = 6;
        plane->dc = dc;

        num_formats = ARRAY_SIZE(tegra_cursor_plane_formats);
        formats = tegra_cursor_plane_formats;

        err = drm_universal_plane_init(drm, &plane->base, possible_crtcs,
                                       &tegra_plane_funcs, formats,
                                       num_formats, NULL,
                                       DRM_PLANE_TYPE_CURSOR, NULL);
        if (err < 0) {
                kfree(plane);
                return ERR_PTR(err);
        }

        drm_plane_helper_add(&plane->base, &tegra_cursor_plane_helper_funcs);
        drm_plane_create_zpos_immutable_property(&plane->base, 255);

        return &plane->base;
}

static const u32 tegra20_overlay_formats[] = {
        DRM_FORMAT_ARGB4444,
        DRM_FORMAT_ARGB1555,
        DRM_FORMAT_RGB565,
        DRM_FORMAT_RGBA5551,
        DRM_FORMAT_ABGR8888,
        DRM_FORMAT_ARGB8888,
        /* non-native formats */
        DRM_FORMAT_XRGB1555,
        DRM_FORMAT_RGBX5551,

        DRM_FORMAT_XBGR8888,
        DRM_FORMAT_XRGB8888,
        /* planar formats */
        DRM_FORMAT_UYVY,
        DRM_FORMAT_YUYV,
        DRM_FORMAT_YUV420,
        DRM_FORMAT_YUV422,
};

static const u32 tegra114_overlay_formats[] = {
        DRM_FORMAT_ARGB4444,
        DRM_FORMAT_ARGB1555,
        DRM_FORMAT_RGB565,
        DRM_FORMAT_RGBA5551,
        DRM_FORMAT_ABGR8888,
        DRM_FORMAT_ARGB8888,
        /* new on Tegra114 */
        DRM_FORMAT_ABGR4444,
        DRM_FORMAT_ABGR1555,
        DRM_FORMAT_BGRA5551,
        DRM_FORMAT_XRGB1555,
        DRM_FORMAT_RGBX5551,
        DRM_FORMAT_XBGR1555,
        DRM_FORMAT_BGRX5551,
        DRM_FORMAT_BGR565,
        DRM_FORMAT_BGRA8888,
        DRM_FORMAT_RGBA8888,
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_XBGR8888,
        /* planar formats */
        DRM_FORMAT_UYVY,
        DRM_FORMAT_YUYV,
        DRM_FORMAT_YUV420,
        DRM_FORMAT_YUV422,
};

static const u32 tegra124_overlay_formats[] = {
        DRM_FORMAT_ARGB4444,
        DRM_FORMAT_ARGB1555,
        DRM_FORMAT_RGB565,
        DRM_FORMAT_RGBA5551,
        DRM_FORMAT_ABGR8888,
        DRM_FORMAT_ARGB8888,
        /* new on Tegra114 */
        DRM_FORMAT_ABGR4444,
        DRM_FORMAT_ABGR1555,
        DRM_FORMAT_BGRA5551,
        DRM_FORMAT_XRGB1555,
        DRM_FORMAT_RGBX5551,
        DRM_FORMAT_XBGR1555,
        DRM_FORMAT_BGRX5551,
        DRM_FORMAT_BGR565,
        DRM_FORMAT_BGRA8888,
        DRM_FORMAT_RGBA8888,
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_XBGR8888,
        /* new on Tegra124 */
        DRM_FORMAT_RGBX8888,
        DRM_FORMAT_BGRX8888,
        /* planar formats */
        DRM_FORMAT_UYVY,
        DRM_FORMAT_YUYV,
        DRM_FORMAT_YUV420,
        DRM_FORMAT_YUV422,
};

static struct drm_plane *tegra_dc_overlay_plane_create(struct drm_device *drm,
                                                       struct tegra_dc *dc,
                                                       unsigned int index,
                                                       bool cursor)
{
        unsigned long possible_crtcs = tegra_plane_get_possible_crtcs(drm);
        struct tegra_plane *plane;
        unsigned int num_formats;
        enum drm_plane_type type;
        const u32 *formats;
        int err;

        plane = kzalloc(sizeof(*plane), GFP_KERNEL);
        if (!plane)
                return ERR_PTR(-ENOMEM);

        plane->offset = 0xa00 + 0x200 * index;
        plane->index = index;
        plane->dc = dc;

        num_formats = dc->soc->num_overlay_formats;
        formats = dc->soc->overlay_formats;

        if (!cursor)
                type = DRM_PLANE_TYPE_OVERLAY;
        else
                type = DRM_PLANE_TYPE_CURSOR;

        err = drm_universal_plane_init(drm, &plane->base, possible_crtcs,
                                       &tegra_plane_funcs, formats,
                                       num_formats, NULL, type, NULL);
        if (err < 0) {
                kfree(plane);
                return ERR_PTR(err);
        }

        drm_plane_helper_add(&plane->base, &tegra_plane_helper_funcs);
        drm_plane_create_zpos_property(&plane->base, plane->index, 0, 255);

        err = drm_plane_create_rotation_property(&plane->base,
                                                 DRM_MODE_ROTATE_0,
                                                 DRM_MODE_ROTATE_0 |
                                                 DRM_MODE_ROTATE_180 |
                                                 DRM_MODE_REFLECT_X |
                                                 DRM_MODE_REFLECT_Y);
        if (err < 0)
                dev_err(dc->dev, "failed to create rotation property: %d\n",
                        err);

        return &plane->base;
}

static struct drm_plane *tegra_dc_add_shared_planes(struct drm_device *drm,
                                                    struct tegra_dc *dc)
{
        struct drm_plane *plane, *primary = NULL;
        unsigned int i, j;

        for (i = 0; i < dc->soc->num_wgrps; i++) {
                const struct tegra_windowgroup_soc *wgrp = &dc->soc->wgrps[i];

                if (wgrp->dc == dc->pipe) {
                        for (j = 0; j < wgrp->num_windows; j++) {
                                unsigned int index = wgrp->windows[j];

                                plane = tegra_shared_plane_create(drm, dc,
                                                                  wgrp->index,
                                                                  index);
                                if (IS_ERR(plane))
                                        return plane;

                                /*
                                 * Choose the first shared plane owned by this
                                 * head as the primary plane.
                                 */
                                if (!primary) {
                                        plane->type = DRM_PLANE_TYPE_PRIMARY;
                                        primary = plane;
                                }
                        }
                }
        }

        return primary;
}

static struct drm_plane *tegra_dc_add_planes(struct drm_device *drm,
                                             struct tegra_dc *dc)
{
        struct drm_plane *planes[2], *primary;
        unsigned int planes_num;
        unsigned int i;
        int err;

        primary = tegra_primary_plane_create(drm, dc);
        if (IS_ERR(primary))
                return primary;

        if (dc->soc->supports_cursor)
                planes_num = 2;
        else
                planes_num = 1;

        for (i = 0; i < planes_num; i++) {
                planes[i] = tegra_dc_overlay_plane_create(drm, dc, 1 + i,
                                                          false);
                if (IS_ERR(planes[i])) {
                        err = PTR_ERR(planes[i]);

                        while (i--)
                                tegra_plane_funcs.destroy(planes[i]);

                        tegra_plane_funcs.destroy(primary);
                        return ERR_PTR(err);
                }
        }

        return primary;
}

static void tegra_dc_destroy(struct drm_crtc *crtc)
{
        drm_crtc_cleanup(crtc);
}

static void tegra_crtc_reset(struct drm_crtc *crtc)
{
        struct tegra_dc_state *state = kzalloc(sizeof(*state), GFP_KERNEL);

        if (crtc->state)
                tegra_crtc_atomic_destroy_state(crtc, crtc->state);

        __drm_atomic_helper_crtc_reset(crtc, &state->base);
}

static struct drm_crtc_state *
tegra_crtc_atomic_duplicate_state(struct drm_crtc *crtc)
{
        struct tegra_dc_state *state = to_dc_state(crtc->state);
        struct tegra_dc_state *copy;

        copy = kmalloc(sizeof(*copy), GFP_KERNEL);
        if (!copy)
                return NULL;

        __drm_atomic_helper_crtc_duplicate_state(crtc, &copy->base);
        copy->clk = state->clk;
        copy->pclk = state->pclk;
        copy->div = state->div;
        copy->planes = state->planes;

        return &copy->base;
}

static void tegra_crtc_atomic_destroy_state(struct drm_crtc *crtc,
                                            struct drm_crtc_state *state)
{
        __drm_atomic_helper_crtc_destroy_state(state);
        kfree(state);
}

#define DEBUGFS_REG32(_name) { .name = #_name, .offset = _name }

static const struct debugfs_reg32 tegra_dc_regs[] = {
        DEBUGFS_REG32(DC_CMD_GENERAL_INCR_SYNCPT),
        DEBUGFS_REG32(DC_CMD_GENERAL_INCR_SYNCPT_CNTRL),
        DEBUGFS_REG32(DC_CMD_GENERAL_INCR_SYNCPT_ERROR),
        DEBUGFS_REG32(DC_CMD_WIN_A_INCR_SYNCPT),
        DEBUGFS_REG32(DC_CMD_WIN_A_INCR_SYNCPT_CNTRL),
        DEBUGFS_REG32(DC_CMD_WIN_A_INCR_SYNCPT_ERROR),
        DEBUGFS_REG32(DC_CMD_WIN_B_INCR_SYNCPT),
        DEBUGFS_REG32(DC_CMD_WIN_B_INCR_SYNCPT_CNTRL),
        DEBUGFS_REG32(DC_CMD_WIN_B_INCR_SYNCPT_ERROR),
        DEBUGFS_REG32(DC_CMD_WIN_C_INCR_SYNCPT),
        DEBUGFS_REG32(DC_CMD_WIN_C_INCR_SYNCPT_CNTRL),
        DEBUGFS_REG32(DC_CMD_WIN_C_INCR_SYNCPT_ERROR),
        DEBUGFS_REG32(DC_CMD_CONT_SYNCPT_VSYNC),
        DEBUGFS_REG32(DC_CMD_DISPLAY_COMMAND_OPTION0),
        DEBUGFS_REG32(DC_CMD_DISPLAY_COMMAND),
        DEBUGFS_REG32(DC_CMD_SIGNAL_RAISE),
        DEBUGFS_REG32(DC_CMD_DISPLAY_POWER_CONTROL),
        DEBUGFS_REG32(DC_CMD_INT_STATUS),
        DEBUGFS_REG32(DC_CMD_INT_MASK),
        DEBUGFS_REG32(DC_CMD_INT_ENABLE),
        DEBUGFS_REG32(DC_CMD_INT_TYPE),
        DEBUGFS_REG32(DC_CMD_INT_POLARITY),
        DEBUGFS_REG32(DC_CMD_SIGNAL_RAISE1),
        DEBUGFS_REG32(DC_CMD_SIGNAL_RAISE2),
        DEBUGFS_REG32(DC_CMD_SIGNAL_RAISE3),
        DEBUGFS_REG32(DC_CMD_STATE_ACCESS),
        DEBUGFS_REG32(DC_CMD_STATE_CONTROL),
        DEBUGFS_REG32(DC_CMD_DISPLAY_WINDOW_HEADER),
        DEBUGFS_REG32(DC_CMD_REG_ACT_CONTROL),
        DEBUGFS_REG32(DC_COM_CRC_CONTROL),
        DEBUGFS_REG32(DC_COM_CRC_CHECKSUM),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_ENABLE(0)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_ENABLE(1)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_ENABLE(2)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_ENABLE(3)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_POLARITY(0)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_POLARITY(1)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_POLARITY(2)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_POLARITY(3)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_DATA(0)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_DATA(1)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_DATA(2)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_DATA(3)),
        DEBUGFS_REG32(DC_COM_PIN_INPUT_ENABLE(0)),
        DEBUGFS_REG32(DC_COM_PIN_INPUT_ENABLE(1)),
        DEBUGFS_REG32(DC_COM_PIN_INPUT_ENABLE(2)),
        DEBUGFS_REG32(DC_COM_PIN_INPUT_ENABLE(3)),
        DEBUGFS_REG32(DC_COM_PIN_INPUT_DATA(0)),
        DEBUGFS_REG32(DC_COM_PIN_INPUT_DATA(1)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_SELECT(0)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_SELECT(1)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_SELECT(2)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_SELECT(3)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_SELECT(4)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_SELECT(5)),
        DEBUGFS_REG32(DC_COM_PIN_OUTPUT_SELECT(6)),
        DEBUGFS_REG32(DC_COM_PIN_MISC_CONTROL),
        DEBUGFS_REG32(DC_COM_PIN_PM0_CONTROL),
        DEBUGFS_REG32(DC_COM_PIN_PM0_DUTY_CYCLE),
        DEBUGFS_REG32(DC_COM_PIN_PM1_CONTROL),
        DEBUGFS_REG32(DC_COM_PIN_PM1_DUTY_CYCLE),
        DEBUGFS_REG32(DC_COM_SPI_CONTROL),
        DEBUGFS_REG32(DC_COM_SPI_START_BYTE),
        DEBUGFS_REG32(DC_COM_HSPI_WRITE_DATA_AB),
        DEBUGFS_REG32(DC_COM_HSPI_WRITE_DATA_CD),
        DEBUGFS_REG32(DC_COM_HSPI_CS_DC),
        DEBUGFS_REG32(DC_COM_SCRATCH_REGISTER_A),
        DEBUGFS_REG32(DC_COM_SCRATCH_REGISTER_B),
        DEBUGFS_REG32(DC_COM_GPIO_CTRL),
        DEBUGFS_REG32(DC_COM_GPIO_DEBOUNCE_COUNTER),
        DEBUGFS_REG32(DC_COM_CRC_CHECKSUM_LATCHED),
        DEBUGFS_REG32(DC_DISP_DISP_SIGNAL_OPTIONS0),
        DEBUGFS_REG32(DC_DISP_DISP_SIGNAL_OPTIONS1),
        DEBUGFS_REG32(DC_DISP_DISP_WIN_OPTIONS),
        DEBUGFS_REG32(DC_DISP_DISP_MEM_HIGH_PRIORITY),
        DEBUGFS_REG32(DC_DISP_DISP_MEM_HIGH_PRIORITY_TIMER),
        DEBUGFS_REG32(DC_DISP_DISP_TIMING_OPTIONS),
        DEBUGFS_REG32(DC_DISP_REF_TO_SYNC),
        DEBUGFS_REG32(DC_DISP_SYNC_WIDTH),
        DEBUGFS_REG32(DC_DISP_BACK_PORCH),
        DEBUGFS_REG32(DC_DISP_ACTIVE),
        DEBUGFS_REG32(DC_DISP_FRONT_PORCH),
        DEBUGFS_REG32(DC_DISP_H_PULSE0_CONTROL),
        DEBUGFS_REG32(DC_DISP_H_PULSE0_POSITION_A),
        DEBUGFS_REG32(DC_DISP_H_PULSE0_POSITION_B),
        DEBUGFS_REG32(DC_DISP_H_PULSE0_POSITION_C),
        DEBUGFS_REG32(DC_DISP_H_PULSE0_POSITION_D),
        DEBUGFS_REG32(DC_DISP_H_PULSE1_CONTROL),
        DEBUGFS_REG32(DC_DISP_H_PULSE1_POSITION_A),
        DEBUGFS_REG32(DC_DISP_H_PULSE1_POSITION_B),
        DEBUGFS_REG32(DC_DISP_H_PULSE1_POSITION_C),
        DEBUGFS_REG32(DC_DISP_H_PULSE1_POSITION_D),
        DEBUGFS_REG32(DC_DISP_H_PULSE2_CONTROL),
        DEBUGFS_REG32(DC_DISP_H_PULSE2_POSITION_A),
        DEBUGFS_REG32(DC_DISP_H_PULSE2_POSITION_B),
        DEBUGFS_REG32(DC_DISP_H_PULSE2_POSITION_C),
        DEBUGFS_REG32(DC_DISP_H_PULSE2_POSITION_D),
        DEBUGFS_REG32(DC_DISP_V_PULSE0_CONTROL),
        DEBUGFS_REG32(DC_DISP_V_PULSE0_POSITION_A),
        DEBUGFS_REG32(DC_DISP_V_PULSE0_POSITION_B),
        DEBUGFS_REG32(DC_DISP_V_PULSE0_POSITION_C),
        DEBUGFS_REG32(DC_DISP_V_PULSE1_CONTROL),
        DEBUGFS_REG32(DC_DISP_V_PULSE1_POSITION_A),
        DEBUGFS_REG32(DC_DISP_V_PULSE1_POSITION_B),
        DEBUGFS_REG32(DC_DISP_V_PULSE1_POSITION_C),
        DEBUGFS_REG32(DC_DISP_V_PULSE2_CONTROL),
        DEBUGFS_REG32(DC_DISP_V_PULSE2_POSITION_A),
        DEBUGFS_REG32(DC_DISP_V_PULSE3_CONTROL),
        DEBUGFS_REG32(DC_DISP_V_PULSE3_POSITION_A),
        DEBUGFS_REG32(DC_DISP_M0_CONTROL),
        DEBUGFS_REG32(DC_DISP_M1_CONTROL),
        DEBUGFS_REG32(DC_DISP_DI_CONTROL),
        DEBUGFS_REG32(DC_DISP_PP_CONTROL),
        DEBUGFS_REG32(DC_DISP_PP_SELECT_A),
        DEBUGFS_REG32(DC_DISP_PP_SELECT_B),
        DEBUGFS_REG32(DC_DISP_PP_SELECT_C),
        DEBUGFS_REG32(DC_DISP_PP_SELECT_D),
        DEBUGFS_REG32(DC_DISP_DISP_CLOCK_CONTROL),
        DEBUGFS_REG32(DC_DISP_DISP_INTERFACE_CONTROL),
        DEBUGFS_REG32(DC_DISP_DISP_COLOR_CONTROL),
        DEBUGFS_REG32(DC_DISP_SHIFT_CLOCK_OPTIONS),
        DEBUGFS_REG32(DC_DISP_DATA_ENABLE_OPTIONS),
        DEBUGFS_REG32(DC_DISP_SERIAL_INTERFACE_OPTIONS),
        DEBUGFS_REG32(DC_DISP_LCD_SPI_OPTIONS),
        DEBUGFS_REG32(DC_DISP_BORDER_COLOR),
        DEBUGFS_REG32(DC_DISP_COLOR_KEY0_LOWER),
        DEBUGFS_REG32(DC_DISP_COLOR_KEY0_UPPER),
        DEBUGFS_REG32(DC_DISP_COLOR_KEY1_LOWER),
        DEBUGFS_REG32(DC_DISP_COLOR_KEY1_UPPER),
        DEBUGFS_REG32(DC_DISP_CURSOR_FOREGROUND),
        DEBUGFS_REG32(DC_DISP_CURSOR_BACKGROUND),
        DEBUGFS_REG32(DC_DISP_CURSOR_START_ADDR),
        DEBUGFS_REG32(DC_DISP_CURSOR_START_ADDR_NS),
        DEBUGFS_REG32(DC_DISP_CURSOR_POSITION),
        DEBUGFS_REG32(DC_DISP_CURSOR_POSITION_NS),
        DEBUGFS_REG32(DC_DISP_INIT_SEQ_CONTROL),
        DEBUGFS_REG32(DC_DISP_SPI_INIT_SEQ_DATA_A),
        DEBUGFS_REG32(DC_DISP_SPI_INIT_SEQ_DATA_B),
        DEBUGFS_REG32(DC_DISP_SPI_INIT_SEQ_DATA_C),
        DEBUGFS_REG32(DC_DISP_SPI_INIT_SEQ_DATA_D),
        DEBUGFS_REG32(DC_DISP_DC_MCCIF_FIFOCTRL),
        DEBUGFS_REG32(DC_DISP_MCCIF_DISPLAY0A_HYST),
        DEBUGFS_REG32(DC_DISP_MCCIF_DISPLAY0B_HYST),
        DEBUGFS_REG32(DC_DISP_MCCIF_DISPLAY1A_HYST),
        DEBUGFS_REG32(DC_DISP_MCCIF_DISPLAY1B_HYST),
        DEBUGFS_REG32(DC_DISP_DAC_CRT_CTRL),
        DEBUGFS_REG32(DC_DISP_DISP_MISC_CONTROL),
        DEBUGFS_REG32(DC_DISP_SD_CONTROL),
        DEBUGFS_REG32(DC_DISP_SD_CSC_COEFF),
        DEBUGFS_REG32(DC_DISP_SD_LUT(0)),
        DEBUGFS_REG32(DC_DISP_SD_LUT(1)),
        DEBUGFS_REG32(DC_DISP_SD_LUT(2)),
        DEBUGFS_REG32(DC_DISP_SD_LUT(3)),
        DEBUGFS_REG32(DC_DISP_SD_LUT(4)),
        DEBUGFS_REG32(DC_DISP_SD_LUT(5)),
        DEBUGFS_REG32(DC_DISP_SD_LUT(6)),
        DEBUGFS_REG32(DC_DISP_SD_LUT(7)),
        DEBUGFS_REG32(DC_DISP_SD_LUT(8)),
        DEBUGFS_REG32(DC_DISP_SD_FLICKER_CONTROL),
        DEBUGFS_REG32(DC_DISP_DC_PIXEL_COUNT),
        DEBUGFS_REG32(DC_DISP_SD_HISTOGRAM(0)),
        DEBUGFS_REG32(DC_DISP_SD_HISTOGRAM(1)),
        DEBUGFS_REG32(DC_DISP_SD_HISTOGRAM(2)),
        DEBUGFS_REG32(DC_DISP_SD_HISTOGRAM(3)),
        DEBUGFS_REG32(DC_DISP_SD_HISTOGRAM(4)),
        DEBUGFS_REG32(DC_DISP_SD_HISTOGRAM(5)),
        DEBUGFS_REG32(DC_DISP_SD_HISTOGRAM(6)),
        DEBUGFS_REG32(DC_DISP_SD_HISTOGRAM(7)),
        DEBUGFS_REG32(DC_DISP_SD_BL_TF(0)),
        DEBUGFS_REG32(DC_DISP_SD_BL_TF(1)),
        DEBUGFS_REG32(DC_DISP_SD_BL_TF(2)),
        DEBUGFS_REG32(DC_DISP_SD_BL_TF(3)),
        DEBUGFS_REG32(DC_DISP_SD_BL_CONTROL),
        DEBUGFS_REG32(DC_DISP_SD_HW_K_VALUES),
        DEBUGFS_REG32(DC_DISP_SD_MAN_K_VALUES),
        DEBUGFS_REG32(DC_DISP_CURSOR_START_ADDR_HI),
        DEBUGFS_REG32(DC_DISP_BLEND_CURSOR_CONTROL),
        DEBUGFS_REG32(DC_WIN_WIN_OPTIONS),
        DEBUGFS_REG32(DC_WIN_BYTE_SWAP),
        DEBUGFS_REG32(DC_WIN_BUFFER_CONTROL),
        DEBUGFS_REG32(DC_WIN_COLOR_DEPTH),
        DEBUGFS_REG32(DC_WIN_POSITION),
        DEBUGFS_REG32(DC_WIN_SIZE),
        DEBUGFS_REG32(DC_WIN_PRESCALED_SIZE),
        DEBUGFS_REG32(DC_WIN_H_INITIAL_DDA),
        DEBUGFS_REG32(DC_WIN_V_INITIAL_DDA),
        DEBUGFS_REG32(DC_WIN_DDA_INC),
        DEBUGFS_REG32(DC_WIN_LINE_STRIDE),
        DEBUGFS_REG32(DC_WIN_BUF_STRIDE),
        DEBUGFS_REG32(DC_WIN_UV_BUF_STRIDE),
        DEBUGFS_REG32(DC_WIN_BUFFER_ADDR_MODE),
        DEBUGFS_REG32(DC_WIN_DV_CONTROL),
        DEBUGFS_REG32(DC_WIN_BLEND_NOKEY),
        DEBUGFS_REG32(DC_WIN_BLEND_1WIN),
        DEBUGFS_REG32(DC_WIN_BLEND_2WIN_X),
        DEBUGFS_REG32(DC_WIN_BLEND_2WIN_Y),
        DEBUGFS_REG32(DC_WIN_BLEND_3WIN_XY),
        DEBUGFS_REG32(DC_WIN_HP_FETCH_CONTROL),
        DEBUGFS_REG32(DC_WINBUF_START_ADDR),
        DEBUGFS_REG32(DC_WINBUF_START_ADDR_NS),
        DEBUGFS_REG32(DC_WINBUF_START_ADDR_U),
        DEBUGFS_REG32(DC_WINBUF_START_ADDR_U_NS),
        DEBUGFS_REG32(DC_WINBUF_START_ADDR_V),
        DEBUGFS_REG32(DC_WINBUF_START_ADDR_V_NS),
        DEBUGFS_REG32(DC_WINBUF_ADDR_H_OFFSET),
        DEBUGFS_REG32(DC_WINBUF_ADDR_H_OFFSET_NS),
        DEBUGFS_REG32(DC_WINBUF_ADDR_V_OFFSET),
        DEBUGFS_REG32(DC_WINBUF_ADDR_V_OFFSET_NS),
        DEBUGFS_REG32(DC_WINBUF_UFLOW_STATUS),
        DEBUGFS_REG32(DC_WINBUF_AD_UFLOW_STATUS),
        DEBUGFS_REG32(DC_WINBUF_BD_UFLOW_STATUS),
        DEBUGFS_REG32(DC_WINBUF_CD_UFLOW_STATUS),
};

static int tegra_dc_show_regs(struct seq_file *s, void *data)
{
        struct drm_info_node *node = s->private;
        struct tegra_dc *dc = node->info_ent->data;
        unsigned int i;
        int err = 0;

        drm_modeset_lock(&dc->base.mutex, NULL);

        if (!dc->base.state->active) {
                err = -EBUSY;
                goto unlock;
        }

        for (i = 0; i < ARRAY_SIZE(tegra_dc_regs); i++) {
                unsigned int offset = tegra_dc_regs[i].offset;

                seq_printf(s, "%-40s %#05x %08x\n", tegra_dc_regs[i].name,
                           offset, tegra_dc_readl(dc, offset));
        }

unlock:
        drm_modeset_unlock(&dc->base.mutex);
        return err;
}

static int tegra_dc_show_crc(struct seq_file *s, void *data)
{
        struct drm_info_node *node = s->private;
        struct tegra_dc *dc = node->info_ent->data;
        int err = 0;
        u32 value;

        drm_modeset_lock(&dc->base.mutex, NULL);

        if (!dc->base.state->active) {
                err = -EBUSY;
                goto unlock;
        }

        value = DC_COM_CRC_CONTROL_ACTIVE_DATA | DC_COM_CRC_CONTROL_ENABLE;
        tegra_dc_writel(dc, value, DC_COM_CRC_CONTROL);
        tegra_dc_commit(dc);

        drm_crtc_wait_one_vblank(&dc->base);
        drm_crtc_wait_one_vblank(&dc->base);

        value = tegra_dc_readl(dc, DC_COM_CRC_CHECKSUM);
        seq_printf(s, "%08x\n", value);

        tegra_dc_writel(dc, 0, DC_COM_CRC_CONTROL);

unlock:
        drm_modeset_unlock(&dc->base.mutex);
        return err;
}

static int tegra_dc_show_stats(struct seq_file *s, void *data)
{
        struct drm_info_node *node = s->private;
        struct tegra_dc *dc = node->info_ent->data;

        seq_printf(s, "frames: %lu\n", dc->stats.frames);
        seq_printf(s, "vblank: %lu\n", dc->stats.vblank);
        seq_printf(s, "underflow: %lu\n", dc->stats.underflow);
        seq_printf(s, "overflow: %lu\n", dc->stats.overflow);

        return 0;
}

static struct drm_info_list debugfs_files[] = {
        { "regs", tegra_dc_show_regs, 0, NULL },
        { "crc", tegra_dc_show_crc, 0, NULL },
        { "stats", tegra_dc_show_stats, 0, NULL },
};

static int tegra_dc_late_register(struct drm_crtc *crtc)
{
        unsigned int i, count = ARRAY_SIZE(debugfs_files);
        struct drm_minor *minor = crtc->dev->primary;
        struct dentry *root;
        struct tegra_dc *dc = to_tegra_dc(crtc);

#ifdef CONFIG_DEBUG_FS
        root = crtc->debugfs_entry;
#else
        root = NULL;
#endif

        dc->debugfs_files = kmemdup(debugfs_files, sizeof(debugfs_files),
                                    GFP_KERNEL);
        if (!dc->debugfs_files)
                return -ENOMEM;

        for (i = 0; i < count; i++)
                dc->debugfs_files[i].data = dc;

        drm_debugfs_create_files(dc->debugfs_files, count, root, minor);

        return 0;
}

static void tegra_dc_early_unregister(struct drm_crtc *crtc)
{
        unsigned int count = ARRAY_SIZE(debugfs_files);
        struct drm_minor *minor = crtc->dev->primary;
        struct tegra_dc *dc = to_tegra_dc(crtc);

        drm_debugfs_remove_files(dc->debugfs_files, count, minor);
        kfree(dc->debugfs_files);
        dc->debugfs_files = NULL;
}

static u32 tegra_dc_get_vblank_counter(struct drm_crtc *crtc)
{
        struct tegra_dc *dc = to_tegra_dc(crtc);

        /* XXX vblank syncpoints don't work with nvdisplay yet */
        if (dc->syncpt && !dc->soc->has_nvdisplay)
                return host1x_syncpt_read(dc->syncpt);

        /* fallback to software emulated VBLANK counter */
        return (u32)drm_crtc_vblank_count(&dc->base);
}

static int tegra_dc_enable_vblank(struct drm_crtc *crtc)
{
        struct tegra_dc *dc = to_tegra_dc(crtc);
        u32 value;

        value = tegra_dc_readl(dc, DC_CMD_INT_MASK);
        value |= VBLANK_INT;
        tegra_dc_writel(dc, value, DC_CMD_INT_MASK);

        return 0;
}

static void tegra_dc_disable_vblank(struct drm_crtc *crtc)
{
        struct tegra_dc *dc = to_tegra_dc(crtc);
        u32 value;

        value = tegra_dc_readl(dc, DC_CMD_INT_MASK);
        value &= ~VBLANK_INT;
        tegra_dc_writel(dc, value, DC_CMD_INT_MASK);
}

static const struct drm_crtc_funcs tegra_crtc_funcs = {
        .page_flip = drm_atomic_helper_page_flip,
        .set_config = drm_atomic_helper_set_config,
        .destroy = tegra_dc_destroy,
        .reset = tegra_crtc_reset,
        .atomic_duplicate_state = tegra_crtc_atomic_duplicate_state,
        .atomic_destroy_state = tegra_crtc_atomic_destroy_state,
        .late_register = tegra_dc_late_register,
        .early_unregister = tegra_dc_early_unregister,
        .get_vblank_counter = tegra_dc_get_vblank_counter,
        .enable_vblank = tegra_dc_enable_vblank,
        .disable_vblank = tegra_dc_disable_vblank,
};

static int tegra_dc_set_timings(struct tegra_dc *dc,
                                struct drm_display_mode *mode)
{
        unsigned int h_ref_to_sync = 1;
        unsigned int v_ref_to_sync = 1;
        unsigned long value;

        if (!dc->soc->has_nvdisplay) {
                tegra_dc_writel(dc, 0x0, DC_DISP_DISP_TIMING_OPTIONS);

                value = (v_ref_to_sync << 16) | h_ref_to_sync;
                tegra_dc_writel(dc, value, DC_DISP_REF_TO_SYNC);
        }

        value = ((mode->vsync_end - mode->vsync_start) << 16) |
                ((mode->hsync_end - mode->hsync_start) <<  0);
        tegra_dc_writel(dc, value, DC_DISP_SYNC_WIDTH);

        value = ((mode->vtotal - mode->vsync_end) << 16) |
                ((mode->htotal - mode->hsync_end) <<  0);
        tegra_dc_writel(dc, value, DC_DISP_BACK_PORCH);

        value = ((mode->vsync_start - mode->vdisplay) << 16) |
                ((mode->hsync_start - mode->hdisplay) <<  0);
        tegra_dc_writel(dc, value, DC_DISP_FRONT_PORCH);

        value = (mode->vdisplay << 16) | mode->hdisplay;
        tegra_dc_writel(dc, value, DC_DISP_ACTIVE);

        return 0;
}

/**
 * tegra_dc_state_setup_clock - check clock settings and store them in atomic
 *     state
 * @dc: display controller
 * @crtc_state: CRTC atomic state
 * @clk: parent clock for display controller
 * @pclk: pixel clock
 * @div: shift clock divider
 *
 * Returns:
 * 0 on success or a negative error-code on failure.
 */
int tegra_dc_state_setup_clock(struct tegra_dc *dc,
                               struct drm_crtc_state *crtc_state,
                               struct clk *clk, unsigned long pclk,
                               unsigned int div)
{
        struct tegra_dc_state *state = to_dc_state(crtc_state);

        if (!clk_has_parent(dc->clk, clk))
                return -EINVAL;

        state->clk = clk;
        state->pclk = pclk;
        state->div = div;

        return 0;
}

static void tegra_dc_commit_state(struct tegra_dc *dc,
                                  struct tegra_dc_state *state)
{
        u32 value;
        int err;

        err = clk_set_parent(dc->clk, state->clk);
        if (err < 0)
                dev_err(dc->dev, "failed to set parent clock: %d\n", err);

        /*
         * Outputs may not want to change the parent clock rate. This is only
         * relevant to Tegra20 where only a single display PLL is available.
         * Since that PLL would typically be used for HDMI, an internal LVDS
         * panel would need to be driven by some other clock such as PLL_P
         * which is shared with other peripherals. Changing the clock rate
         * should therefore be avoided.
         */
        if (state->pclk > 0) {
                err = clk_set_rate(state->clk, state->pclk);
                if (err < 0)
                        dev_err(dc->dev,
                                "failed to set clock rate to %lu Hz\n",
                                state->pclk);
        }

        DRM_DEBUG_KMS("rate: %lu, div: %u\n", clk_get_rate(dc->clk),
                      state->div);
        DRM_DEBUG_KMS("pclk: %lu\n", state->pclk);

        if (!dc->soc->has_nvdisplay) {
                value = SHIFT_CLK_DIVIDER(state->div) | PIXEL_CLK_DIVIDER_PCD1;
                tegra_dc_writel(dc, value, DC_DISP_DISP_CLOCK_CONTROL);
        }

        err = clk_set_rate(dc->clk, state->pclk);
        if (err < 0)
                dev_err(dc->dev, "failed to set clock %pC to %lu Hz: %d\n",
                        dc->clk, state->pclk, err);
}

static void tegra_dc_stop(struct tegra_dc *dc)
{
        u32 value;

        /* stop the display controller */
        value = tegra_dc_readl(dc, DC_CMD_DISPLAY_COMMAND);
        value &= ~DISP_CTRL_MODE_MASK;
        tegra_dc_writel(dc, value, DC_CMD_DISPLAY_COMMAND);

        tegra_dc_commit(dc);
}

static bool tegra_dc_idle(struct tegra_dc *dc)
{
        u32 value;

        value = tegra_dc_readl_active(dc, DC_CMD_DISPLAY_COMMAND);

        return (value & DISP_CTRL_MODE_MASK) == 0;
}

static int tegra_dc_wait_idle(struct tegra_dc *dc, unsigned long timeout)
{
        timeout = jiffies + msecs_to_jiffies(timeout);

        while (time_before(jiffies, timeout)) {
                if (tegra_dc_idle(dc))
                        return 0;

                usleep_range(1000, 2000);
        }

        dev_dbg(dc->dev, "timeout waiting for DC to become idle\n");
        return -ETIMEDOUT;
}

static void tegra_crtc_atomic_disable(struct drm_crtc *crtc,
                                      struct drm_crtc_state *old_state)
{
        struct tegra_dc *dc = to_tegra_dc(crtc);
        u32 value;
        int err;

        if (!tegra_dc_idle(dc)) {
                tegra_dc_stop(dc);

                /*
                 * Ignore the return value, there isn't anything useful to do
                 * in case this fails.
                 */
                tegra_dc_wait_idle(dc, 100);
        }

        /*
         * This should really be part of the RGB encoder driver, but clearing
         * these bits has the side-effect of stopping the display controller.
         * When that happens no VBLANK interrupts will be raised. At the same
         * time the encoder is disabled before the display controller, so the
         * above code is always going to timeout waiting for the controller
         * to go idle.
         *
         * Given the close coupling between the RGB encoder and the display
         * controller doing it here is still kind of okay. None of the other
         * encoder drivers require these bits to be cleared.
         *
         * XXX: Perhaps given that the display controller is switched off at
         * this point anyway maybe clearing these bits isn't even useful for
         * the RGB encoder?
         */
        if (dc->rgb) {
                value = tegra_dc_readl(dc, DC_CMD_DISPLAY_POWER_CONTROL);
                value &= ~(PW0_ENABLE | PW1_ENABLE | PW2_ENABLE | PW3_ENABLE |
                           PW4_ENABLE | PM0_ENABLE | PM1_ENABLE);
                tegra_dc_writel(dc, value, DC_CMD_DISPLAY_POWER_CONTROL);
        }

        tegra_dc_stats_reset(&dc->stats);
        drm_crtc_vblank_off(crtc);

        spin_lock_irq(&crtc->dev->event_lock);

        if (crtc->state->event) {
                drm_crtc_send_vblank_event(crtc, crtc->state->event);
                crtc->state->event = NULL;
        }

        spin_unlock_irq(&crtc->dev->event_lock);

        err = host1x_client_suspend(&dc->client);
        if (err < 0)
                dev_err(dc->dev, "failed to suspend: %d\n", err);
}

static void tegra_crtc_atomic_enable(struct drm_crtc *crtc,
                                     struct drm_crtc_state *old_state)
{
        struct drm_display_mode *mode = &crtc->state->adjusted_mode;
        struct tegra_dc_state *state = to_dc_state(crtc->state);
        struct tegra_dc *dc = to_tegra_dc(crtc);
        u32 value;
        int err;

        err = host1x_client_resume(&dc->client);
        if (err < 0) {
                dev_err(dc->dev, "failed to resume: %d\n", err);
                return;
        }

        /* initialize display controller */
        if (dc->syncpt) {
                u32 syncpt = host1x_syncpt_id(dc->syncpt), enable;

                if (dc->soc->has_nvdisplay)
                        enable = 1 << 31;
                else
                        enable = 1 << 8;

                value = SYNCPT_CNTRL_NO_STALL;
                tegra_dc_writel(dc, value, DC_CMD_GENERAL_INCR_SYNCPT_CNTRL);

                value = enable | syncpt;
                tegra_dc_writel(dc, value, DC_CMD_CONT_SYNCPT_VSYNC);
        }

        if (dc->soc->has_nvdisplay) {
                value = DSC_TO_UF_INT | DSC_BBUF_UF_INT | DSC_RBUF_UF_INT |
                        DSC_OBUF_UF_INT;
                tegra_dc_writel(dc, value, DC_CMD_INT_TYPE);

                value = DSC_TO_UF_INT | DSC_BBUF_UF_INT | DSC_RBUF_UF_INT |
                        DSC_OBUF_UF_INT | SD3_BUCKET_WALK_DONE_INT |
                        HEAD_UF_INT | MSF_INT | REG_TMOUT_INT |
                        REGION_CRC_INT | V_PULSE2_INT | V_PULSE3_INT |
                        VBLANK_INT | FRAME_END_INT;
                tegra_dc_writel(dc, value, DC_CMD_INT_POLARITY);

                value = SD3_BUCKET_WALK_DONE_INT | HEAD_UF_INT | VBLANK_INT |
                        FRAME_END_INT;
                tegra_dc_writel(dc, value, DC_CMD_INT_ENABLE);

                value = HEAD_UF_INT | REG_TMOUT_INT | FRAME_END_INT;
                tegra_dc_writel(dc, value, DC_CMD_INT_MASK);

                tegra_dc_writel(dc, READ_MUX, DC_CMD_STATE_ACCESS);
        } else {
                value = WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT |
                        WIN_A_OF_INT | WIN_B_OF_INT | WIN_C_OF_INT;
                tegra_dc_writel(dc, value, DC_CMD_INT_TYPE);

                value = WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT |
                        WIN_A_OF_INT | WIN_B_OF_INT | WIN_C_OF_INT;
                tegra_dc_writel(dc, value, DC_CMD_INT_POLARITY);

                /* initialize timer */
                value = CURSOR_THRESHOLD(0) | WINDOW_A_THRESHOLD(0x20) |
                        WINDOW_B_THRESHOLD(0x20) | WINDOW_C_THRESHOLD(0x20);
                tegra_dc_writel(dc, value, DC_DISP_DISP_MEM_HIGH_PRIORITY);

                value = CURSOR_THRESHOLD(0) | WINDOW_A_THRESHOLD(1) |
                        WINDOW_B_THRESHOLD(1) | WINDOW_C_THRESHOLD(1);
                tegra_dc_writel(dc, value, DC_DISP_DISP_MEM_HIGH_PRIORITY_TIMER);

                value = VBLANK_INT | WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT |
                        WIN_A_OF_INT | WIN_B_OF_INT | WIN_C_OF_INT;
                tegra_dc_writel(dc, value, DC_CMD_INT_ENABLE);

                value = WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT |
                        WIN_A_OF_INT | WIN_B_OF_INT | WIN_C_OF_INT;
                tegra_dc_writel(dc, value, DC_CMD_INT_MASK);
        }

        if (dc->soc->supports_background_color)
                tegra_dc_writel(dc, 0, DC_DISP_BLEND_BACKGROUND_COLOR);
        else
                tegra_dc_writel(dc, 0, DC_DISP_BORDER_COLOR);

        /* apply PLL and pixel clock changes */
        tegra_dc_commit_state(dc, state);

        /* program display mode */
        tegra_dc_set_timings(dc, mode);

        /* interlacing isn't supported yet, so disable it */
        if (dc->soc->supports_interlacing) {
                value = tegra_dc_readl(dc, DC_DISP_INTERLACE_CONTROL);
                value &= ~INTERLACE_ENABLE;
                tegra_dc_writel(dc, value, DC_DISP_INTERLACE_CONTROL);
        }

        value = tegra_dc_readl(dc, DC_CMD_DISPLAY_COMMAND);
        value &= ~DISP_CTRL_MODE_MASK;
        value |= DISP_CTRL_MODE_C_DISPLAY;
        tegra_dc_writel(dc, value, DC_CMD_DISPLAY_COMMAND);

        if (!dc->soc->has_nvdisplay) {
                value = tegra_dc_readl(dc, DC_CMD_DISPLAY_POWER_CONTROL);
                value |= PW0_ENABLE | PW1_ENABLE | PW2_ENABLE | PW3_ENABLE |
                         PW4_ENABLE | PM0_ENABLE | PM1_ENABLE;
                tegra_dc_writel(dc, value, DC_CMD_DISPLAY_POWER_CONTROL);
        }

        /* enable underflow reporting and display red for missing pixels */
        if (dc->soc->has_nvdisplay) {
                value = UNDERFLOW_MODE_RED | UNDERFLOW_REPORT_ENABLE;
                tegra_dc_writel(dc, value, DC_COM_RG_UNDERFLOW);
        }

        tegra_dc_commit(dc);

        drm_crtc_vblank_on(crtc);
}

static void tegra_crtc_atomic_begin(struct drm_crtc *crtc,
                                    struct drm_crtc_state *old_crtc_state)
{
        unsigned long flags;

        if (crtc->state->event) {
                spin_lock_irqsave(&crtc->dev->event_lock, flags);

                if (drm_crtc_vblank_get(crtc) != 0)
                        drm_crtc_send_vblank_event(crtc, crtc->state->event);
                else
                        drm_crtc_arm_vblank_event(crtc, crtc->state->event);

                spin_unlock_irqrestore(&crtc->dev->event_lock, flags);

                crtc->state->event = NULL;
        }
}

static void tegra_crtc_atomic_flush(struct drm_crtc *crtc,
                                    struct drm_crtc_state *old_crtc_state)
{
        struct tegra_dc_state *state = to_dc_state(crtc->state);
        struct tegra_dc *dc = to_tegra_dc(crtc);
        u32 value;

        value = state->planes << 8 | GENERAL_UPDATE;
        tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
        value = tegra_dc_readl(dc, DC_CMD_STATE_CONTROL);

        value = state->planes | GENERAL_ACT_REQ;
        tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
        value = tegra_dc_readl(dc, DC_CMD_STATE_CONTROL);
}

static const struct drm_crtc_helper_funcs tegra_crtc_helper_funcs = {
        .atomic_begin = tegra_crtc_atomic_begin,
        .atomic_flush = tegra_crtc_atomic_flush,
        .atomic_enable = tegra_crtc_atomic_enable,
        .atomic_disable = tegra_crtc_atomic_disable,
};

static irqreturn_t tegra_dc_irq(int irq, void *data)
{
        struct tegra_dc *dc = data;
        unsigned long status;

        status = tegra_dc_readl(dc, DC_CMD_INT_STATUS);
        tegra_dc_writel(dc, status, DC_CMD_INT_STATUS);

        if (status & FRAME_END_INT) {
                /*
                dev_dbg(dc->dev, "%s(): frame end\n", __func__);
                */
                dc->stats.frames++;
        }

        if (status & VBLANK_INT) {
                /*
                dev_dbg(dc->dev, "%s(): vertical blank\n", __func__);
                */
                drm_crtc_handle_vblank(&dc->base);
                dc->stats.vblank++;
        }

        if (status & (WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT)) {
                /*
                dev_dbg(dc->dev, "%s(): underflow\n", __func__);
                */
                dc->stats.underflow++;
        }

        if (status & (WIN_A_OF_INT | WIN_B_OF_INT | WIN_C_OF_INT)) {
                /*
                dev_dbg(dc->dev, "%s(): overflow\n", __func__);
                */
                dc->stats.overflow++;
        }

        if (status & HEAD_UF_INT) {
                dev_dbg_ratelimited(dc->dev, "%s(): head underflow\n", __func__);

                dc->stats.underflow++;
        }

        return IRQ_HANDLED;
}

static bool tegra_dc_has_window_groups(struct tegra_dc *dc)
{
        unsigned int i;

        if (!dc->soc->wgrps)
                return true;

        for (i = 0; i < dc->soc->num_wgrps; i++) {
                const struct tegra_windowgroup_soc *wgrp = &dc->soc->wgrps[i];

                if (wgrp->dc == dc->pipe && wgrp->num_windows > 0)
                        return true;
        }

        return false;
}

static int tegra_dc_init(struct host1x_client *client)
{
        struct drm_device *drm = dev_get_drvdata(client->host);
        unsigned long flags = HOST1X_SYNCPT_CLIENT_MANAGED;
        struct tegra_dc *dc = host1x_client_to_dc(client);
        struct tegra_drm *tegra = drm->dev_private;
        struct drm_plane *primary = NULL;
        struct drm_plane *cursor = NULL;
        int err;

        /*
         * XXX do not register DCs with no window groups because we cannot
         * assign a primary plane to them, which in turn will cause KMS to
         * crash.
         */
        if (!tegra_dc_has_window_groups(dc))
                return 0;

        /*
         * Set the display hub as the host1x client parent for the display
         * controller. This is needed for the runtime reference counting that
         * ensures the display hub is always powered when any of the display
         * controllers are.
         */
        if (dc->soc->has_nvdisplay)
                client->parent = &tegra->hub->client;

        dc->syncpt = host1x_syncpt_request(client, flags);
        if (!dc->syncpt)
                dev_warn(dc->dev, "failed to allocate syncpoint\n");

        err = host1x_client_iommu_attach(client);
        if (err < 0 && err != -ENODEV) {
                dev_err(client->dev, "failed to attach to domain: %d\n", err);
                return err;
        }

        if (dc->soc->wgrps)
                primary = tegra_dc_add_shared_planes(drm, dc);
        else
                primary = tegra_dc_add_planes(drm, dc);

        if (IS_ERR(primary)) {
                err = PTR_ERR(primary);
                goto cleanup;
        }

        if (dc->soc->supports_cursor) {
                cursor = tegra_dc_cursor_plane_create(drm, dc);
                if (IS_ERR(cursor)) {
                        err = PTR_ERR(cursor);
                        goto cleanup;
                }
        } else {
                /* dedicate one overlay to mouse cursor */
                cursor = tegra_dc_overlay_plane_create(drm, dc, 2, true);
                if (IS_ERR(cursor)) {
                        err = PTR_ERR(cursor);
                        goto cleanup;
                }
        }

        err = drm_crtc_init_with_planes(drm, &dc->base, primary, cursor,
                                        &tegra_crtc_funcs, NULL);
        if (err < 0)
                goto cleanup;

        drm_crtc_helper_add(&dc->base, &tegra_crtc_helper_funcs);

        /*
         * Keep track of the minimum pitch alignment across all display
         * controllers.
         */
        if (dc->soc->pitch_align > tegra->pitch_align)
                tegra->pitch_align = dc->soc->pitch_align;

        err = tegra_dc_rgb_init(drm, dc);
        if (err < 0 && err != -ENODEV) {
                dev_err(dc->dev, "failed to initialize RGB output: %d\n", err);
                goto cleanup;
        }

        err = devm_request_irq(dc->dev, dc->irq, tegra_dc_irq, 0,
                               dev_name(dc->dev), dc);
        if (err < 0) {
                dev_err(dc->dev, "failed to request IRQ#%u: %d\n", dc->irq,
                        err);
                goto cleanup;
        }

        /*
         * Inherit the DMA parameters (such as maximum segment size) from the
         * parent host1x device.
         */
        client->dev->dma_parms = client->host->dma_parms;

        return 0;

cleanup:
        if (!IS_ERR_OR_NULL(cursor))
                drm_plane_cleanup(cursor);

        if (!IS_ERR(primary))
                drm_plane_cleanup(primary);

        host1x_client_iommu_detach(client);
        host1x_syncpt_free(dc->syncpt);

        return err;
}

static int tegra_dc_exit(struct host1x_client *client)
{
        struct tegra_dc *dc = host1x_client_to_dc(client);
        int err;

        if (!tegra_dc_has_window_groups(dc))
                return 0;

        /* avoid a dangling pointer just in case this disappears */
        client->dev->dma_parms = NULL;

        devm_free_irq(dc->dev, dc->irq, dc);

        err = tegra_dc_rgb_exit(dc);
        if (err) {
                dev_err(dc->dev, "failed to shutdown RGB output: %d\n", err);
                return err;
        }

        host1x_client_iommu_detach(client);
        host1x_syncpt_free(dc->syncpt);

        return 0;
}

static int tegra_dc_runtime_suspend(struct host1x_client *client)
{
        struct tegra_dc *dc = host1x_client_to_dc(client);
        struct device *dev = client->dev;
        int err;

        err = reset_control_assert(dc->rst);
        if (err < 0) {
                dev_err(dev, "failed to assert reset: %d\n", err);
                return err;
        }

        if (dc->soc->has_powergate)
                tegra_powergate_power_off(dc->powergate);

        clk_disable_unprepare(dc->clk);
        pm_runtime_put_sync(dev);

        return 0;
}

static int tegra_dc_runtime_resume(struct host1x_client *client)
{
        struct tegra_dc *dc = host1x_client_to_dc(client);
        struct device *dev = client->dev;
        int err;

        err = pm_runtime_get_sync(dev);
        if (err < 0) {
                dev_err(dev, "failed to get runtime PM: %d\n", err);
                return err;
        }

        if (dc->soc->has_powergate) {
                err = tegra_powergate_sequence_power_up(dc->powergate, dc->clk,
                                                        dc->rst);
                if (err < 0) {
                        dev_err(dev, "failed to power partition: %d\n", err);
                        goto put_rpm;
                }
        } else {
                err = clk_prepare_enable(dc->clk);
                if (err < 0) {
                        dev_err(dev, "failed to enable clock: %d\n", err);
                        goto put_rpm;
                }

                err = reset_control_deassert(dc->rst);
                if (err < 0) {
                        dev_err(dev, "failed to deassert reset: %d\n", err);
                        goto disable_clk;
                }
        }

        return 0;

disable_clk:
        clk_disable_unprepare(dc->clk);
put_rpm:
        pm_runtime_put_sync(dev);
        return err;
}

static const struct host1x_client_ops dc_client_ops = {
        .init = tegra_dc_init,
        .exit = tegra_dc_exit,
        .suspend = tegra_dc_runtime_suspend,
        .resume = tegra_dc_runtime_resume,
};

static const struct tegra_dc_soc_info tegra20_dc_soc_info = {
        .supports_background_color = false,
        .supports_interlacing = false,
        .supports_cursor = false,
        .supports_block_linear = false,
        .has_legacy_blending = true,
        .pitch_align = 8,
        .has_powergate = false,
        .coupled_pm = true,
        .has_nvdisplay = false,
        .num_primary_formats = ARRAY_SIZE(tegra20_primary_formats),
        .primary_formats = tegra20_primary_formats,
        .num_overlay_formats = ARRAY_SIZE(tegra20_overlay_formats),
        .overlay_formats = tegra20_overlay_formats,
        .modifiers = tegra20_modifiers,
        .has_win_a_without_filters = true,
        .has_win_c_without_vert_filter = true,
};

static const struct tegra_dc_soc_info tegra30_dc_soc_info = {
        .supports_background_color = false,
        .supports_interlacing = false,
        .supports_cursor = false,
        .supports_block_linear = false,
        .has_legacy_blending = true,
        .pitch_align = 8,
        .has_powergate = false,
        .coupled_pm = false,
        .has_nvdisplay = false,
        .num_primary_formats = ARRAY_SIZE(tegra20_primary_formats),
        .primary_formats = tegra20_primary_formats,
        .num_overlay_formats = ARRAY_SIZE(tegra20_overlay_formats),
        .overlay_formats = tegra20_overlay_formats,
        .modifiers = tegra20_modifiers,
        .has_win_a_without_filters = false,
        .has_win_c_without_vert_filter = false,
};

static const struct tegra_dc_soc_info tegra114_dc_soc_info = {
        .supports_background_color = false,
        .supports_interlacing = false,
        .supports_cursor = false,
        .supports_block_linear = false,
        .has_legacy_blending = true,
        .pitch_align = 64,
        .has_powergate = true,
        .coupled_pm = false,
        .has_nvdisplay = false,
        .num_primary_formats = ARRAY_SIZE(tegra114_primary_formats),
        .primary_formats = tegra114_primary_formats,
        .num_overlay_formats = ARRAY_SIZE(tegra114_overlay_formats),
        .overlay_formats = tegra114_overlay_formats,
        .modifiers = tegra20_modifiers,
        .has_win_a_without_filters = false,
        .has_win_c_without_vert_filter = false,
};

static const struct tegra_dc_soc_info tegra124_dc_soc_info = {
        .supports_background_color = true,
        .supports_interlacing = true,
        .supports_cursor = true,
        .supports_block_linear = true,
        .has_legacy_blending = false,
        .pitch_align = 64,
        .has_powergate = true,
        .coupled_pm = false,
        .has_nvdisplay = false,
        .num_primary_formats = ARRAY_SIZE(tegra124_primary_formats),
        .primary_formats = tegra124_primary_formats,
        .num_overlay_formats = ARRAY_SIZE(tegra124_overlay_formats),
        .overlay_formats = tegra124_overlay_formats,
        .modifiers = tegra124_modifiers,
        .has_win_a_without_filters = false,
        .has_win_c_without_vert_filter = false,
};

static const struct tegra_dc_soc_info tegra210_dc_soc_info = {
        .supports_background_color = true,
        .supports_interlacing = true,
        .supports_cursor = true,
        .supports_block_linear = true,
        .has_legacy_blending = false,
        .pitch_align = 64,
        .has_powergate = true,
        .coupled_pm = false,
        .has_nvdisplay = false,
        .num_primary_formats = ARRAY_SIZE(tegra114_primary_formats),
        .primary_formats = tegra114_primary_formats,
        .num_overlay_formats = ARRAY_SIZE(tegra114_overlay_formats),
        .overlay_formats = tegra114_overlay_formats,
        .modifiers = tegra124_modifiers,
        .has_win_a_without_filters = false,
        .has_win_c_without_vert_filter = false,
};

static const struct tegra_windowgroup_soc tegra186_dc_wgrps[] = {
        {
                .index = 0,
                .dc = 0,
                .windows = (const unsigned int[]) { 0 },
                .num_windows = 1,
        }, {
                .index = 1,
                .dc = 1,
                .windows = (const unsigned int[]) { 1 },
                .num_windows = 1,
        }, {
                .index = 2,
                .dc = 1,
                .windows = (const unsigned int[]) { 2 },
                .num_windows = 1,
        }, {
                .index = 3,
                .dc = 2,
                .windows = (const unsigned int[]) { 3 },
                .num_windows = 1,
        }, {
                .index = 4,
                .dc = 2,
                .windows = (const unsigned int[]) { 4 },
                .num_windows = 1,
        }, {
                .index = 5,
                .dc = 2,
                .windows = (const unsigned int[]) { 5 },
                .num_windows = 1,
        },
};

static const struct tegra_dc_soc_info tegra186_dc_soc_info = {
        .supports_background_color = true,
        .supports_interlacing = true,
        .supports_cursor = true,
        .supports_block_linear = true,
        .has_legacy_blending = false,
        .pitch_align = 64,
        .has_powergate = false,
        .coupled_pm = false,
        .has_nvdisplay = true,
        .wgrps = tegra186_dc_wgrps,
        .num_wgrps = ARRAY_SIZE(tegra186_dc_wgrps),
};

static const struct tegra_windowgroup_soc tegra194_dc_wgrps[] = {
        {
                .index = 0,
                .dc = 0,
                .windows = (const unsigned int[]) { 0 },
                .num_windows = 1,
        }, {
                .index = 1,
                .dc = 1,
                .windows = (const unsigned int[]) { 1 },
                .num_windows = 1,
        }, {
                .index = 2,
                .dc = 1,
                .windows = (const unsigned int[]) { 2 },
                .num_windows = 1,
        }, {
                .index = 3,
                .dc = 2,
                .windows = (const unsigned int[]) { 3 },
                .num_windows = 1,
        }, {
                .index = 4,
                .dc = 2,
                .windows = (const unsigned int[]) { 4 },
                .num_windows = 1,
        }, {
                .index = 5,
                .dc = 2,
                .windows = (const unsigned int[]) { 5 },
                .num_windows = 1,
        },
};

static const struct tegra_dc_soc_info tegra194_dc_soc_info = {
        .supports_background_color = true,
        .supports_interlacing = true,
        .supports_cursor = true,
        .supports_block_linear = true,
        .has_legacy_blending = false,
        .pitch_align = 64,
        .has_powergate = false,
        .coupled_pm = false,
        .has_nvdisplay = true,
        .wgrps = tegra194_dc_wgrps,
        .num_wgrps = ARRAY_SIZE(tegra194_dc_wgrps),
};

static const struct of_device_id tegra_dc_of_match[] = {
        {
                .compatible = "nvidia,tegra194-dc",
                .data = &tegra194_dc_soc_info,
        }, {
                .compatible = "nvidia,tegra186-dc",
                .data = &tegra186_dc_soc_info,
        }, {
                .compatible = "nvidia,tegra210-dc",
                .data = &tegra210_dc_soc_info,
        }, {
                .compatible = "nvidia,tegra124-dc",
                .data = &tegra124_dc_soc_info,
        }, {
                .compatible = "nvidia,tegra114-dc",
                .data = &tegra114_dc_soc_info,
        }, {
                .compatible = "nvidia,tegra30-dc",
                .data = &tegra30_dc_soc_info,
        }, {
                .compatible = "nvidia,tegra20-dc",
                .data = &tegra20_dc_soc_info,
        }, {
                /* sentinel */
        }
};
MODULE_DEVICE_TABLE(of, tegra_dc_of_match);

static int tegra_dc_parse_dt(struct tegra_dc *dc)
{
        struct device_node *np;
        u32 value = 0;
        int err;

        err = of_property_read_u32(dc->dev->of_node, "nvidia,head", &value);
        if (err < 0) {
                dev_err(dc->dev, "missing \"nvidia,head\" property\n");

                /*
                 * If the nvidia,head property isn't present, try to find the
                 * correct head number by looking up the position of this
                 * display controller's node within the device tree. Assuming
                 * that the nodes are ordered properly in the DTS file and
                 * that the translation into a flattened device tree blob
                 * preserves that ordering this will actually yield the right
                 * head number.
                 *
                 * If those assumptions don't hold, this will still work for
                 * cases where only a single display controller is used.
                 */
                for_each_matching_node(np, tegra_dc_of_match) {
                        if (np == dc->dev->of_node) {
                                of_node_put(np);
                                break;
                        }

                        value++;
                }
        }

        dc->pipe = value;

        return 0;
}

static int tegra_dc_match_by_pipe(struct device *dev, const void *data)
{
        struct tegra_dc *dc = dev_get_drvdata(dev);
        unsigned int pipe = (unsigned long)(void *)data;

        return dc->pipe == pipe;
}

static int tegra_dc_couple(struct tegra_dc *dc)
{
        /*
         * On Tegra20, DC1 requires DC0 to be taken out of reset in order to
         * be enabled, otherwise CPU hangs on writing to CMD_DISPLAY_COMMAND /
         * POWER_CONTROL registers during CRTC enabling.
         */
        if (dc->soc->coupled_pm && dc->pipe == 1) {
                u32 flags = DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_CONSUMER;
                struct device_link *link;
                struct device *partner;

                partner = driver_find_device(dc->dev->driver, NULL, NULL,
                                             tegra_dc_match_by_pipe);
                if (!partner)
                        return -EPROBE_DEFER;

                link = device_link_add(dc->dev, partner, flags);
                if (!link) {
                        dev_err(dc->dev, "failed to link controllers\n");
                        return -EINVAL;
                }

                dev_dbg(dc->dev, "coupled to %s\n", dev_name(partner));
        }

        return 0;
}

static int tegra_dc_probe(struct platform_device *pdev)
{
        struct tegra_dc *dc;
        int err;

        dc = devm_kzalloc(&pdev->dev, sizeof(*dc), GFP_KERNEL);
        if (!dc)
                return -ENOMEM;

        dc->soc = of_device_get_match_data(&pdev->dev);

        INIT_LIST_HEAD(&dc->list);
        dc->dev = &pdev->dev;

        err = tegra_dc_parse_dt(dc);
        if (err < 0)
                return err;

        err = tegra_dc_couple(dc);
        if (err < 0)
                return err;

        dc->clk = devm_clk_get(&pdev->dev, NULL);
        if (IS_ERR(dc->clk)) {
                dev_err(&pdev->dev, "failed to get clock\n");
                return PTR_ERR(dc->clk);
        }

        dc->rst = devm_reset_control_get(&pdev->dev, "dc");
        if (IS_ERR(dc->rst)) {
                dev_err(&pdev->dev, "failed to get reset\n");
                return PTR_ERR(dc->rst);
        }

        /* assert reset and disable clock */
        err = clk_prepare_enable(dc->clk);
        if (err < 0)
                return err;

        usleep_range(2000, 4000);

        err = reset_control_assert(dc->rst);
        if (err < 0)
                return err;

        usleep_range(2000, 4000);

        clk_disable_unprepare(dc->clk);

        if (dc->soc->has_powergate) {
                if (dc->pipe == 0)
                        dc->powergate = TEGRA_POWERGATE_DIS;
                else
                        dc->powergate = TEGRA_POWERGATE_DISB;

                tegra_powergate_power_off(dc->powergate);
        }

        dc->regs = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(dc->regs))
                return PTR_ERR(dc->regs);

        dc->irq = platform_get_irq(pdev, 0);
        if (dc->irq < 0)
                return -ENXIO;

        err = tegra_dc_rgb_probe(dc);
        if (err < 0 && err != -ENODEV) {
                const char *level = KERN_ERR;

                if (err == -EPROBE_DEFER)
                        level = KERN_DEBUG;

                dev_printk(level, dc->dev, "failed to probe RGB output: %d\n",
                           err);
                return err;
        }

        platform_set_drvdata(pdev, dc);
        pm_runtime_enable(&pdev->dev);

        INIT_LIST_HEAD(&dc->client.list);
        dc->client.ops = &dc_client_ops;
        dc->client.dev = &pdev->dev;

        err = host1x_client_register(&dc->client);
        if (err < 0) {
                dev_err(&pdev->dev, "failed to register host1x client: %d\n",
                        err);
                goto disable_pm;
        }

        return 0;

disable_pm:
        pm_runtime_disable(&pdev->dev);
        tegra_dc_rgb_remove(dc);

        return err;
}

static int tegra_dc_remove(struct platform_device *pdev)
{
        struct tegra_dc *dc = platform_get_drvdata(pdev);
        int err;

        err = host1x_client_unregister(&dc->client);
        if (err < 0) {
                dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
                        err);
                return err;
        }

        err = tegra_dc_rgb_remove(dc);
        if (err < 0) {
                dev_err(&pdev->dev, "failed to remove RGB output: %d\n", err);
                return err;
        }

        pm_runtime_disable(&pdev->dev);

        return 0;
}

struct platform_driver tegra_dc_driver = {
        .driver = {
                .name = "tegra-dc",
                .of_match_table = tegra_dc_of_match,
        },
        .probe = tegra_dc_probe,
        .remove = tegra_dc_remove,
};