/*
 * rcar_du_plane.c  --  R-Car Display Unit Planes
 *
 * Copyright (C) 2013-2015 Renesas Electronics Corporation
 *
 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <drm/drmP.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_plane_helper.h>

#include "rcar_du_drv.h"
#include "rcar_du_group.h"
#include "rcar_du_kms.h"
#include "rcar_du_plane.h"
#include "rcar_du_regs.h"

/* -----------------------------------------------------------------------------
 * Atomic hardware plane allocator
 *
 * The hardware plane allocator is solely based on the atomic plane states
 * without keeping any external state to avoid races between .atomic_check()
 * and .atomic_commit().
 *
 * The core idea is to avoid using a free planes bitmask that would need to be
 * shared between check and commit handlers with a collective knowledge based on
 * the allocated hardware plane(s) for each KMS plane. The allocator then loops
 * over all plane states to compute the free planes bitmask, allocates hardware
 * planes based on that bitmask, and stores the result back in the plane states.
 *
 * For this to work we need to access the current state of planes not touched by
 * the atomic update. To ensure that it won't be modified, we need to lock all
 * planes using drm_atomic_get_plane_state(). This effectively serializes atomic
 * updates from .atomic_check() up to completion (when swapping the states if
 * the check step has succeeded) or rollback (when freeing the states if the
 * check step has failed).
 *
 * Allocation is performed in the .atomic_check() handler and applied
 * automatically when the core swaps the old and new states.
 */

static bool rcar_du_plane_needs_realloc(struct rcar_du_plane *plane,
                                        struct rcar_du_plane_state *new_state)
{
        struct rcar_du_plane_state *cur_state;

        cur_state = to_rcar_plane_state(plane->plane.state);

        /* Lowering the number of planes doesn't strictly require reallocation
         * as the extra hardware plane will be freed when committing, but doing
         * so could lead to more fragmentation.
         */
        if (!cur_state->format ||
            cur_state->format->planes != new_state->format->planes)
                return true;

        /* Reallocate hardware planes if the source has changed. */
        if (cur_state->source != new_state->source)
                return true;

        return false;
}

static unsigned int rcar_du_plane_hwmask(struct rcar_du_plane_state *state)
{
        unsigned int mask;

        if (state->hwindex == -1)
                return 0;

        mask = 1 << state->hwindex;
        if (state->format->planes == 2)
                mask |= 1 << ((state->hwindex + 1) % 8);

        return mask;
}

/*
 * The R8A7790 DU can source frames directly from the VSP1 devices VSPD0 and
 * VSPD1. VSPD0 feeds DU0/1 plane 0, and VSPD1 feeds either DU2 plane 0 or
 * DU0/1 plane 1.
 *
 * Allocate the correct fixed plane when sourcing frames from VSPD0 or VSPD1,
 * and allocate planes in reverse index order otherwise to ensure maximum
 * availability of planes 0 and 1.
 *
 * The caller is responsible for ensuring that the requested source is
 * compatible with the DU revision.
 */
static int rcar_du_plane_hwalloc(struct rcar_du_plane *plane,
                                 struct rcar_du_plane_state *state,
                                 unsigned int free)
{
        unsigned int num_planes = state->format->planes;
        int fixed = -1;
        int i;

        if (state->source == RCAR_DU_PLANE_VSPD0) {
                /* VSPD0 feeds plane 0 on DU0/1. */
                if (plane->group->index != 0)
                        return -EINVAL;

                fixed = 0;
        } else if (state->source == RCAR_DU_PLANE_VSPD1) {
                /* VSPD1 feeds plane 1 on DU0/1 or plane 0 on DU2. */
                fixed = plane->group->index == 0 ? 1 : 0;
        }

        if (fixed >= 0)
                return free & (1 << fixed) ? fixed : -EBUSY;

        for (i = RCAR_DU_NUM_HW_PLANES - 1; i >= 0; --i) {
                if (!(free & (1 << i)))
                        continue;

                if (num_planes == 1 || free & (1 << ((i + 1) % 8)))
                        break;
        }

        return i < 0 ? -EBUSY : i;
}

int rcar_du_atomic_check_planes(struct drm_device *dev,
                                struct drm_atomic_state *state)
{
        struct rcar_du_device *rcdu = dev->dev_private;
        unsigned int group_freed_planes[RCAR_DU_MAX_GROUPS] = { 0, };
        unsigned int group_free_planes[RCAR_DU_MAX_GROUPS] = { 0, };
        bool needs_realloc = false;
        unsigned int groups = 0;
        unsigned int i;
        struct drm_plane *drm_plane;
        struct drm_plane_state *drm_plane_state;

        /* Check if hardware planes need to be reallocated. */
        for_each_plane_in_state(state, drm_plane, drm_plane_state, i) {
                struct rcar_du_plane_state *plane_state;
                struct rcar_du_plane *plane;
                unsigned int index;

                plane = to_rcar_plane(drm_plane);
                plane_state = to_rcar_plane_state(drm_plane_state);

                dev_dbg(rcdu->dev, "%s: checking plane (%u,%tu)\n", __func__,
                        plane->group->index, plane - plane->group->planes);

                /* If the plane is being disabled we don't need to go through
                 * the full reallocation procedure. Just mark the hardware
                 * plane(s) as freed.
                 */
                if (!plane_state->format) {
                        dev_dbg(rcdu->dev, "%s: plane is being disabled\n",
                                __func__);
                        index = plane - plane->group->planes;
                        group_freed_planes[plane->group->index] |= 1 << index;
                        plane_state->hwindex = -1;
                        continue;
                }

                /* If the plane needs to be reallocated mark it as such, and
                 * mark the hardware plane(s) as free.
                 */
                if (rcar_du_plane_needs_realloc(plane, plane_state)) {
                        dev_dbg(rcdu->dev, "%s: plane needs reallocation\n",
                                __func__);
                        groups |= 1 << plane->group->index;
                        needs_realloc = true;

                        index = plane - plane->group->planes;
                        group_freed_planes[plane->group->index] |= 1 << index;
                        plane_state->hwindex = -1;
                }
        }

        if (!needs_realloc)
                return 0;

        /* Grab all plane states for the groups that need reallocation to ensure
         * locking and avoid racy updates. This serializes the update operation,
         * but there's not much we can do about it as that's the hardware
         * design.
         *
         * Compute the used planes mask for each group at the same time to avoid
         * looping over the planes separately later.
         */
        while (groups) {
                unsigned int index = ffs(groups) - 1;
                struct rcar_du_group *group = &rcdu->groups[index];
                unsigned int used_planes = 0;

                dev_dbg(rcdu->dev, "%s: finding free planes for group %u\n",
                        __func__, index);

                for (i = 0; i < group->num_planes; ++i) {
                        struct rcar_du_plane *plane = &group->planes[i];
                        struct rcar_du_plane_state *plane_state;
                        struct drm_plane_state *s;

                        s = drm_atomic_get_plane_state(state, &plane->plane);
                        if (IS_ERR(s))
                                return PTR_ERR(s);

                        /* If the plane has been freed in the above loop its
                         * hardware planes must not be added to the used planes
                         * bitmask. However, the current state doesn't reflect
                         * the free state yet, as we've modified the new state
                         * above. Use the local freed planes list to check for
                         * that condition instead.
                         */
                        if (group_freed_planes[index] & (1 << i)) {
                                dev_dbg(rcdu->dev,
                                        "%s: plane (%u,%tu) has been freed, skipping\n",
                                        __func__, plane->group->index,
                                        plane - plane->group->planes);
                                continue;
                        }

                        plane_state = to_rcar_plane_state(plane->plane.state);
                        used_planes |= rcar_du_plane_hwmask(plane_state);

                        dev_dbg(rcdu->dev,
                                "%s: plane (%u,%tu) uses %u hwplanes (index %d)\n",
                                __func__, plane->group->index,
                                plane - plane->group->planes,
                                plane_state->format ?
                                plane_state->format->planes : 0,
                                plane_state->hwindex);
                }

                group_free_planes[index] = 0xff & ~used_planes;
                groups &= ~(1 << index);

                dev_dbg(rcdu->dev, "%s: group %u free planes mask 0x%02x\n",
                        __func__, index, group_free_planes[index]);
        }

        /* Reallocate hardware planes for each plane that needs it. */
        for_each_plane_in_state(state, drm_plane, drm_plane_state, i) {
                struct rcar_du_plane_state *plane_state;
                struct rcar_du_plane *plane;
                unsigned int crtc_planes;
                unsigned int free;
                int idx;

                plane = to_rcar_plane(drm_plane);
                plane_state = to_rcar_plane_state(drm_plane_state);

                dev_dbg(rcdu->dev, "%s: allocating plane (%u,%tu)\n", __func__,
                        plane->group->index, plane - plane->group->planes);

                /* Skip planes that are being disabled or don't need to be
                 * reallocated.
                 */
                if (!plane_state->format ||
                    !rcar_du_plane_needs_realloc(plane, plane_state))
                        continue;

                /* Try to allocate the plane from the free planes currently
                 * associated with the target CRTC to avoid restarting the CRTC
                 * group and thus minimize flicker. If it fails fall back to
                 * allocating from all free planes.
                 */
                crtc_planes = to_rcar_crtc(plane_state->state.crtc)->index % 2
                            ? plane->group->dptsr_planes
                            : ~plane->group->dptsr_planes;
                free = group_free_planes[plane->group->index];

                idx = rcar_du_plane_hwalloc(plane, plane_state,
                                            free & crtc_planes);
                if (idx < 0)
                        idx = rcar_du_plane_hwalloc(plane, plane_state,
                                                    free);
                if (idx < 0) {
                        dev_dbg(rcdu->dev, "%s: no available hardware plane\n",
                                __func__);
                        return idx;
                }

                dev_dbg(rcdu->dev, "%s: allocated %u hwplanes (index %u)\n",
                        __func__, plane_state->format->planes, idx);

                plane_state->hwindex = idx;

                group_free_planes[plane->group->index] &=
                        ~rcar_du_plane_hwmask(plane_state);

                dev_dbg(rcdu->dev, "%s: group %u free planes mask 0x%02x\n",
                        __func__, plane->group->index,
                        group_free_planes[plane->group->index]);
        }

        return 0;
}

/* -----------------------------------------------------------------------------
 * Plane Setup
 */

#define RCAR_DU_COLORKEY_NONE           (0 << 24)
#define RCAR_DU_COLORKEY_SOURCE         (1 << 24)
#define RCAR_DU_COLORKEY_MASK           (1 << 24)

static void rcar_du_plane_write(struct rcar_du_group *rgrp,
                                unsigned int index, u32 reg, u32 data)
{
        rcar_du_write(rgrp->dev, rgrp->mmio_offset + index * PLANE_OFF + reg,
                      data);
}

static void rcar_du_plane_setup_scanout(struct rcar_du_group *rgrp,
                                        const struct rcar_du_plane_state *state)
{
        unsigned int src_x = state->state.src_x >> 16;
        unsigned int src_y = state->state.src_y >> 16;
        unsigned int index = state->hwindex;
        unsigned int pitch;
        bool interlaced;
        u32 dma[2];

        interlaced = state->state.crtc->state->adjusted_mode.flags
                   & DRM_MODE_FLAG_INTERLACE;

        if (state->source == RCAR_DU_PLANE_MEMORY) {
                struct drm_framebuffer *fb = state->state.fb;
                struct drm_gem_cma_object *gem;
                unsigned int i;

                if (state->format->planes == 2)
                        pitch = fb->pitches[0];
                else
                        pitch = fb->pitches[0] * 8 / state->format->bpp;

                for (i = 0; i < state->format->planes; ++i) {
                        gem = drm_fb_cma_get_gem_obj(fb, i);
                        dma[i] = gem->paddr + fb->offsets[i];
                }
        } else {
                pitch = state->state.src_w >> 16;
                dma[0] = 0;
                dma[1] = 0;
        }

        /* Memory pitch (expressed in pixels). Must be doubled for interlaced
         * operation with 32bpp formats.
         */
        rcar_du_plane_write(rgrp, index, PnMWR,
                            (interlaced && state->format->bpp == 32) ?
                            pitch * 2 : pitch);

        /* The Y position is expressed in raster line units and must be doubled
         * for 32bpp formats, according to the R8A7790 datasheet. No mention of
         * doubling the Y position is found in the R8A7779 datasheet, but the
         * rule seems to apply there as well.
         *
         * Despite not being documented, doubling seem not to be needed when
         * operating in interlaced mode.
         *
         * Similarly, for the second plane, NV12 and NV21 formats seem to
         * require a halved Y position value, in both progressive and interlaced
         * modes.
         */
        rcar_du_plane_write(rgrp, index, PnSPXR, src_x);
        rcar_du_plane_write(rgrp, index, PnSPYR, src_y *
                            (!interlaced && state->format->bpp == 32 ? 2 : 1));

        rcar_du_plane_write(rgrp, index, PnDSA0R, dma[0]);

        if (state->format->planes == 2) {
                index = (index + 1) % 8;

                rcar_du_plane_write(rgrp, index, PnMWR, pitch);

                rcar_du_plane_write(rgrp, index, PnSPXR, src_x);
                rcar_du_plane_write(rgrp, index, PnSPYR, src_y *
                                    (state->format->bpp == 16 ? 2 : 1) / 2);

                rcar_du_plane_write(rgrp, index, PnDSA0R, dma[1]);
        }
}

static void rcar_du_plane_setup_mode(struct rcar_du_group *rgrp,
                                     unsigned int index,
                                     const struct rcar_du_plane_state *state)
{
        u32 colorkey;
        u32 pnmr;

        /* The PnALPHAR register controls alpha-blending in 16bpp formats
         * (ARGB1555 and XRGB1555).
         *
         * For ARGB, set the alpha value to 0, and enable alpha-blending when
         * the A bit is 0. This maps A=0 to alpha=0 and A=1 to alpha=255.
         *
         * For XRGB, set the alpha value to the plane-wide alpha value and
         * enable alpha-blending regardless of the X bit value.
         */
        if (state->format->fourcc != DRM_FORMAT_XRGB1555)
                rcar_du_plane_write(rgrp, index, PnALPHAR, PnALPHAR_ABIT_0);
        else
                rcar_du_plane_write(rgrp, index, PnALPHAR,
                                    PnALPHAR_ABIT_X | state->alpha);

        pnmr = PnMR_BM_MD | state->format->pnmr;

        /* Disable color keying when requested. YUV formats have the
         * PnMR_SPIM_TP_OFF bit set in their pnmr field, disabling color keying
         * automatically.
         */
        if ((state->colorkey & RCAR_DU_COLORKEY_MASK) == RCAR_DU_COLORKEY_NONE)
                pnmr |= PnMR_SPIM_TP_OFF;

        /* For packed YUV formats we need to select the U/V order. */
        if (state->format->fourcc == DRM_FORMAT_YUYV)
                pnmr |= PnMR_YCDF_YUYV;

        rcar_du_plane_write(rgrp, index, PnMR, pnmr);

        switch (state->format->fourcc) {
        case DRM_FORMAT_RGB565:
                colorkey = ((state->colorkey & 0xf80000) >> 8)
                         | ((state->colorkey & 0x00fc00) >> 5)
                         | ((state->colorkey & 0x0000f8) >> 3);
                rcar_du_plane_write(rgrp, index, PnTC2R, colorkey);
                break;

        case DRM_FORMAT_ARGB1555:
        case DRM_FORMAT_XRGB1555:
                colorkey = ((state->colorkey & 0xf80000) >> 9)
                         | ((state->colorkey & 0x00f800) >> 6)
                         | ((state->colorkey & 0x0000f8) >> 3);
                rcar_du_plane_write(rgrp, index, PnTC2R, colorkey);
                break;

        case DRM_FORMAT_XRGB8888:
        case DRM_FORMAT_ARGB8888:
                rcar_du_plane_write(rgrp, index, PnTC3R,
                                    PnTC3R_CODE | (state->colorkey & 0xffffff));
                break;
        }
}

static void rcar_du_plane_setup_format_gen2(struct rcar_du_group *rgrp,
                                            unsigned int index,
                                            const struct rcar_du_plane_state *state)
{
        u32 ddcr2 = PnDDCR2_CODE;
        u32 ddcr4;

        /* Data format
         *
         * The data format is selected by the DDDF field in PnMR and the EDF
         * field in DDCR4.
         */

        rcar_du_plane_setup_mode(rgrp, index, state);

        if (state->format->planes == 2) {
                if (state->hwindex != index) {
                        if (state->format->fourcc == DRM_FORMAT_NV12 ||
                            state->format->fourcc == DRM_FORMAT_NV21)
                                ddcr2 |= PnDDCR2_Y420;

                        if (state->format->fourcc == DRM_FORMAT_NV21)
                                ddcr2 |= PnDDCR2_NV21;

                        ddcr2 |= PnDDCR2_DIVU;
                } else {
                        ddcr2 |= PnDDCR2_DIVY;
                }
        }

        rcar_du_plane_write(rgrp, index, PnDDCR2, ddcr2);

        ddcr4 = state->format->edf | PnDDCR4_CODE;
        if (state->source != RCAR_DU_PLANE_MEMORY)
                ddcr4 |= PnDDCR4_VSPS;

        rcar_du_plane_write(rgrp, index, PnDDCR4, ddcr4);
}

static void rcar_du_plane_setup_format_gen3(struct rcar_du_group *rgrp,
                                            unsigned int index,
                                            const struct rcar_du_plane_state *state)
{
        rcar_du_plane_write(rgrp, index, PnMR,
                            PnMR_SPIM_TP_OFF | state->format->pnmr);

        rcar_du_plane_write(rgrp, index, PnDDCR4,
                            state->format->edf | PnDDCR4_CODE);
}

static void rcar_du_plane_setup_format(struct rcar_du_group *rgrp,
                                       unsigned int index,
                                       const struct rcar_du_plane_state *state)
{
        struct rcar_du_device *rcdu = rgrp->dev;

        if (rcdu->info->gen < 3)
                rcar_du_plane_setup_format_gen2(rgrp, index, state);
        else
                rcar_du_plane_setup_format_gen3(rgrp, index, state);

        /* Destination position and size */
        rcar_du_plane_write(rgrp, index, PnDSXR, state->state.crtc_w);
        rcar_du_plane_write(rgrp, index, PnDSYR, state->state.crtc_h);
        rcar_du_plane_write(rgrp, index, PnDPXR, state->state.crtc_x);
        rcar_du_plane_write(rgrp, index, PnDPYR, state->state.crtc_y);

        if (rcdu->info->gen < 3) {
                /* Wrap-around and blinking, disabled */
                rcar_du_plane_write(rgrp, index, PnWASPR, 0);
                rcar_du_plane_write(rgrp, index, PnWAMWR, 4095);
                rcar_du_plane_write(rgrp, index, PnBTR, 0);
                rcar_du_plane_write(rgrp, index, PnMLR, 0);
        }
}

void __rcar_du_plane_setup(struct rcar_du_group *rgrp,
                           const struct rcar_du_plane_state *state)
{
        struct rcar_du_device *rcdu = rgrp->dev;

        rcar_du_plane_setup_format(rgrp, state->hwindex, state);
        if (state->format->planes == 2)
                rcar_du_plane_setup_format(rgrp, (state->hwindex + 1) % 8,
                                           state);

        if (rcdu->info->gen < 3)
                rcar_du_plane_setup_scanout(rgrp, state);

        if (state->source == RCAR_DU_PLANE_VSPD1) {
                unsigned int vspd1_sink = rgrp->index ? 2 : 0;

                if (rcdu->vspd1_sink != vspd1_sink) {
                        rcdu->vspd1_sink = vspd1_sink;
                        rcar_du_set_dpad0_vsp1_routing(rcdu);
                }
        }
}

static int rcar_du_plane_atomic_check(struct drm_plane *plane,
                                      struct drm_plane_state *state)
{
        struct rcar_du_plane_state *rstate = to_rcar_plane_state(state);
        struct rcar_du_plane *rplane = to_rcar_plane(plane);
        struct rcar_du_device *rcdu = rplane->group->dev;

        if (!state->fb || !state->crtc) {
                rstate->format = NULL;
                return 0;
        }

        if (state->src_w >> 16 != state->crtc_w ||
            state->src_h >> 16 != state->crtc_h) {
                dev_dbg(rcdu->dev, "%s: scaling not supported\n", __func__);
                return -EINVAL;
        }

        rstate->format = rcar_du_format_info(state->fb->pixel_format);
        if (rstate->format == NULL) {
                dev_dbg(rcdu->dev, "%s: unsupported format %08x\n", __func__,
                        state->fb->pixel_format);
                return -EINVAL;
        }

        return 0;
}

static void rcar_du_plane_atomic_update(struct drm_plane *plane,
                                        struct drm_plane_state *old_state)
{
        struct rcar_du_plane *rplane = to_rcar_plane(plane);
        struct rcar_du_plane_state *old_rstate;
        struct rcar_du_plane_state *new_rstate;

        if (!plane->state->crtc)
                return;

        rcar_du_plane_setup(rplane);

        /* Check whether the source has changed from memory to live source or
         * from live source to memory. The source has been configured by the
         * VSPS bit in the PnDDCR4 register. Although the datasheet states that
         * the bit is updated during vertical blanking, it seems that updates
         * only occur when the DU group is held in reset through the DSYSR.DRES
         * bit. We thus need to restart the group if the source changes.
         */
        old_rstate = to_rcar_plane_state(old_state);
        new_rstate = to_rcar_plane_state(plane->state);

        if ((old_rstate->source == RCAR_DU_PLANE_MEMORY) !=
            (new_rstate->source == RCAR_DU_PLANE_MEMORY))
                rplane->group->need_restart = true;
}

static const struct drm_plane_helper_funcs rcar_du_plane_helper_funcs = {
        .atomic_check = rcar_du_plane_atomic_check,
        .atomic_update = rcar_du_plane_atomic_update,
};

static struct drm_plane_state *
rcar_du_plane_atomic_duplicate_state(struct drm_plane *plane)
{
        struct rcar_du_plane_state *state;
        struct rcar_du_plane_state *copy;

        if (WARN_ON(!plane->state))
                return NULL;

        state = to_rcar_plane_state(plane->state);
        copy = kmemdup(state, sizeof(*state), GFP_KERNEL);
        if (copy == NULL)
                return NULL;

        __drm_atomic_helper_plane_duplicate_state(plane, &copy->state);

        return &copy->state;
}

static void rcar_du_plane_atomic_destroy_state(struct drm_plane *plane,
                                               struct drm_plane_state *state)
{
        __drm_atomic_helper_plane_destroy_state(state);
        kfree(to_rcar_plane_state(state));
}

static void rcar_du_plane_reset(struct drm_plane *plane)
{
        struct rcar_du_plane_state *state;

        if (plane->state) {
                rcar_du_plane_atomic_destroy_state(plane, plane->state);
                plane->state = NULL;
        }

        state = kzalloc(sizeof(*state), GFP_KERNEL);
        if (state == NULL)
                return;

        state->hwindex = -1;
        state->source = RCAR_DU_PLANE_MEMORY;
        state->alpha = 255;
        state->colorkey = RCAR_DU_COLORKEY_NONE;
        state->state.zpos = plane->type == DRM_PLANE_TYPE_PRIMARY ? 0 : 1;

        plane->state = &state->state;
        plane->state->plane = plane;
}

static int rcar_du_plane_atomic_set_property(struct drm_plane *plane,
                                             struct drm_plane_state *state,
                                             struct drm_property *property,
                                             uint64_t val)
{
        struct rcar_du_plane_state *rstate = to_rcar_plane_state(state);
        struct rcar_du_device *rcdu = to_rcar_plane(plane)->group->dev;

        if (property == rcdu->props.alpha)
                rstate->alpha = val;
        else if (property == rcdu->props.colorkey)
                rstate->colorkey = val;
        else
                return -EINVAL;

        return 0;
}

static int rcar_du_plane_atomic_get_property(struct drm_plane *plane,
        const struct drm_plane_state *state, struct drm_property *property,
        uint64_t *val)
{
        const struct rcar_du_plane_state *rstate =
                container_of(state, const struct rcar_du_plane_state, state);
        struct rcar_du_device *rcdu = to_rcar_plane(plane)->group->dev;

        if (property == rcdu->props.alpha)
                *val = rstate->alpha;
        else if (property == rcdu->props.colorkey)
                *val = rstate->colorkey;
        else
                return -EINVAL;

        return 0;
}

static const struct drm_plane_funcs rcar_du_plane_funcs = {
        .update_plane = drm_atomic_helper_update_plane,
        .disable_plane = drm_atomic_helper_disable_plane,
        .reset = rcar_du_plane_reset,
        .set_property = drm_atomic_helper_plane_set_property,
        .destroy = drm_plane_cleanup,
        .atomic_duplicate_state = rcar_du_plane_atomic_duplicate_state,
        .atomic_destroy_state = rcar_du_plane_atomic_destroy_state,
        .atomic_set_property = rcar_du_plane_atomic_set_property,
        .atomic_get_property = rcar_du_plane_atomic_get_property,
};

static const uint32_t formats[] = {
        DRM_FORMAT_RGB565,
        DRM_FORMAT_ARGB1555,
        DRM_FORMAT_XRGB1555,
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_ARGB8888,
        DRM_FORMAT_UYVY,
        DRM_FORMAT_YUYV,
        DRM_FORMAT_NV12,
        DRM_FORMAT_NV21,
        DRM_FORMAT_NV16,
};

int rcar_du_planes_init(struct rcar_du_group *rgrp)
{
        struct rcar_du_device *rcdu = rgrp->dev;
        unsigned int crtcs;
        unsigned int i;
        int ret;

         /* Create one primary plane per CRTC in this group and seven overlay
          * planes.
          */
        rgrp->num_planes = rgrp->num_crtcs + 7;

        crtcs = ((1 << rcdu->num_crtcs) - 1) & (3 << (2 * rgrp->index));

        for (i = 0; i < rgrp->num_planes; ++i) {
                enum drm_plane_type type = i < rgrp->num_crtcs
                                         ? DRM_PLANE_TYPE_PRIMARY
                                         : DRM_PLANE_TYPE_OVERLAY;
                struct rcar_du_plane *plane = &rgrp->planes[i];

                plane->group = rgrp;

                ret = drm_universal_plane_init(rcdu->ddev, &plane->plane, crtcs,
                                               &rcar_du_plane_funcs, formats,
                                               ARRAY_SIZE(formats), type,
                                               NULL);
                if (ret < 0)
                        return ret;

                drm_plane_helper_add(&plane->plane,
                                     &rcar_du_plane_helper_funcs);

                if (type == DRM_PLANE_TYPE_PRIMARY)
                        continue;

                drm_object_attach_property(&plane->plane.base,
                                           rcdu->props.alpha, 255);
                drm_object_attach_property(&plane->plane.base,
                                           rcdu->props.colorkey,
                                           RCAR_DU_COLORKEY_NONE);
                drm_plane_create_zpos_property(&plane->plane, 1, 1, 7);
        }

        return 0;
}