// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2014-2015 The Linux Foundation. All rights reserved.
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 */

#include <drm/drm_atomic.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_print.h>

#include "mdp5_kms.h"

struct mdp5_plane {
        struct drm_plane base;

        uint32_t nformats;
        uint32_t formats[32];
};
#define to_mdp5_plane(x) container_of(x, struct mdp5_plane, base)

static int mdp5_plane_mode_set(struct drm_plane *plane,
                struct drm_crtc *crtc, struct drm_framebuffer *fb,
                struct drm_rect *src, struct drm_rect *dest);

static struct mdp5_kms *get_kms(struct drm_plane *plane)
{
        struct msm_drm_private *priv = plane->dev->dev_private;
        return to_mdp5_kms(to_mdp_kms(priv->kms));
}

static bool plane_enabled(struct drm_plane_state *state)
{
        return state->visible;
}

static void mdp5_plane_destroy(struct drm_plane *plane)
{
        struct mdp5_plane *mdp5_plane = to_mdp5_plane(plane);

        drm_plane_cleanup(plane);

        kfree(mdp5_plane);
}

/* helper to install properties which are common to planes and crtcs */
static void mdp5_plane_install_properties(struct drm_plane *plane,
                struct drm_mode_object *obj)
{
        drm_plane_create_rotation_property(plane,
                                           DRM_MODE_ROTATE_0,
                                           DRM_MODE_ROTATE_0 |
                                           DRM_MODE_ROTATE_180 |
                                           DRM_MODE_REFLECT_X |
                                           DRM_MODE_REFLECT_Y);
        drm_plane_create_alpha_property(plane);
        drm_plane_create_blend_mode_property(plane,
                        BIT(DRM_MODE_BLEND_PIXEL_NONE) |
                        BIT(DRM_MODE_BLEND_PREMULTI) |
                        BIT(DRM_MODE_BLEND_COVERAGE));
        drm_plane_create_zpos_property(plane, 1, 1, 255);
}

static void
mdp5_plane_atomic_print_state(struct drm_printer *p,
                const struct drm_plane_state *state)
{
        struct mdp5_plane_state *pstate = to_mdp5_plane_state(state);
        struct mdp5_kms *mdp5_kms = get_kms(state->plane);

        drm_printf(p, "\thwpipe=%s\n", pstate->hwpipe ?
                        pstate->hwpipe->name : "(null)");
        if (mdp5_kms->caps & MDP_CAP_SRC_SPLIT)
                drm_printf(p, "\tright-hwpipe=%s\n",
                           pstate->r_hwpipe ? pstate->r_hwpipe->name :
                                              "(null)");
        drm_printf(p, "\tblend_mode=%u\n", pstate->base.pixel_blend_mode);
        drm_printf(p, "\tzpos=%u\n", pstate->base.zpos);
        drm_printf(p, "\tnormalized_zpos=%u\n", pstate->base.normalized_zpos);
        drm_printf(p, "\talpha=%u\n", pstate->base.alpha);
        drm_printf(p, "\tstage=%s\n", stage2name(pstate->stage));
}

static void mdp5_plane_reset(struct drm_plane *plane)
{
        struct mdp5_plane_state *mdp5_state;

        if (plane->state)
                __drm_atomic_helper_plane_destroy_state(plane->state);

        kfree(to_mdp5_plane_state(plane->state));
        mdp5_state = kzalloc(sizeof(*mdp5_state), GFP_KERNEL);

        if (plane->type == DRM_PLANE_TYPE_PRIMARY)
                mdp5_state->base.zpos = STAGE_BASE;
        else
                mdp5_state->base.zpos = STAGE0 + drm_plane_index(plane);
        mdp5_state->base.normalized_zpos = mdp5_state->base.zpos;

        __drm_atomic_helper_plane_reset(plane, &mdp5_state->base);
}

static struct drm_plane_state *
mdp5_plane_duplicate_state(struct drm_plane *plane)
{
        struct mdp5_plane_state *mdp5_state;

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

        mdp5_state = kmemdup(to_mdp5_plane_state(plane->state),
                        sizeof(*mdp5_state), GFP_KERNEL);
        if (!mdp5_state)
                return NULL;

        __drm_atomic_helper_plane_duplicate_state(plane, &mdp5_state->base);

        return &mdp5_state->base;
}

static void mdp5_plane_destroy_state(struct drm_plane *plane,
                struct drm_plane_state *state)
{
        struct mdp5_plane_state *pstate = to_mdp5_plane_state(state);

        if (state->fb)
                drm_framebuffer_put(state->fb);

        kfree(pstate);
}

static const struct drm_plane_funcs mdp5_plane_funcs = {
                .update_plane = drm_atomic_helper_update_plane,
                .disable_plane = drm_atomic_helper_disable_plane,
                .destroy = mdp5_plane_destroy,
                .reset = mdp5_plane_reset,
                .atomic_duplicate_state = mdp5_plane_duplicate_state,
                .atomic_destroy_state = mdp5_plane_destroy_state,
                .atomic_print_state = mdp5_plane_atomic_print_state,
};

static void mdp5_plane_cleanup_fb(struct drm_plane *plane,
                                  struct drm_plane_state *old_state)
{
        struct mdp5_kms *mdp5_kms = get_kms(plane);
        struct msm_kms *kms = &mdp5_kms->base.base;
        struct drm_framebuffer *fb = old_state->fb;

        if (!fb)
                return;

        DBG("%s: cleanup: FB[%u]", plane->name, fb->base.id);
        msm_framebuffer_cleanup(fb, kms->aspace);
}

static int mdp5_plane_atomic_check_with_state(struct drm_crtc_state *crtc_state,
                                              struct drm_plane_state *state)
{
        struct mdp5_plane_state *mdp5_state = to_mdp5_plane_state(state);
        struct drm_plane *plane = state->plane;
        struct drm_plane_state *old_state = plane->state;
        struct mdp5_cfg *config = mdp5_cfg_get_config(get_kms(plane)->cfg);
        bool new_hwpipe = false;
        bool need_right_hwpipe = false;
        uint32_t max_width, max_height;
        bool out_of_bounds = false;
        uint32_t caps = 0;
        int min_scale, max_scale;
        int ret;

        DBG("%s: check (%d -> %d)", plane->name,
                        plane_enabled(old_state), plane_enabled(state));

        max_width = config->hw->lm.max_width << 16;
        max_height = config->hw->lm.max_height << 16;

        /* Make sure source dimensions are within bounds. */
        if (state->src_h > max_height)
                out_of_bounds = true;

        if (state->src_w > max_width) {
                /* If source split is supported, we can go up to 2x
                 * the max LM width, but we'd need to stage another
                 * hwpipe to the right LM. So, the drm_plane would
                 * consist of 2 hwpipes.
                 */
                if (config->hw->mdp.caps & MDP_CAP_SRC_SPLIT &&
                    (state->src_w <= 2 * max_width))
                        need_right_hwpipe = true;
                else
                        out_of_bounds = true;
        }

        if (out_of_bounds) {
                struct drm_rect src = drm_plane_state_src(state);
                DBG("Invalid source size "DRM_RECT_FP_FMT,
                                DRM_RECT_FP_ARG(&src));
                return -ERANGE;
        }

        min_scale = FRAC_16_16(1, 8);
        max_scale = FRAC_16_16(8, 1);

        ret = drm_atomic_helper_check_plane_state(state, crtc_state,
                                                  min_scale, max_scale,
                                                  true, true);
        if (ret)
                return ret;

        if (plane_enabled(state)) {
                unsigned int rotation;
                const struct mdp_format *format;
                struct mdp5_kms *mdp5_kms = get_kms(plane);
                uint32_t blkcfg = 0;

                format = to_mdp_format(msm_framebuffer_format(state->fb));
                if (MDP_FORMAT_IS_YUV(format))
                        caps |= MDP_PIPE_CAP_SCALE | MDP_PIPE_CAP_CSC;

                if (((state->src_w >> 16) != state->crtc_w) ||
                                ((state->src_h >> 16) != state->crtc_h))
                        caps |= MDP_PIPE_CAP_SCALE;

                rotation = drm_rotation_simplify(state->rotation,
                                                 DRM_MODE_ROTATE_0 |
                                                 DRM_MODE_REFLECT_X |
                                                 DRM_MODE_REFLECT_Y);

                if (rotation & DRM_MODE_REFLECT_X)
                        caps |= MDP_PIPE_CAP_HFLIP;

                if (rotation & DRM_MODE_REFLECT_Y)
                        caps |= MDP_PIPE_CAP_VFLIP;

                if (plane->type == DRM_PLANE_TYPE_CURSOR)
                        caps |= MDP_PIPE_CAP_CURSOR;

                /* (re)allocate hw pipe if we don't have one or caps-mismatch: */
                if (!mdp5_state->hwpipe || (caps & ~mdp5_state->hwpipe->caps))
                        new_hwpipe = true;

                /*
                 * (re)allocte hw pipe if we're either requesting for 2 hw pipes
                 * or we're switching from 2 hw pipes to 1 hw pipe because the
                 * new src_w can be supported by 1 hw pipe itself.
                 */
                if ((need_right_hwpipe && !mdp5_state->r_hwpipe) ||
                    (!need_right_hwpipe && mdp5_state->r_hwpipe))
                        new_hwpipe = true;

                if (mdp5_kms->smp) {
                        const struct mdp_format *format =
                                to_mdp_format(msm_framebuffer_format(state->fb));

                        blkcfg = mdp5_smp_calculate(mdp5_kms->smp, format,
                                        state->src_w >> 16, false);

                        if (mdp5_state->hwpipe && (mdp5_state->hwpipe->blkcfg != blkcfg))
                                new_hwpipe = true;
                }

                /* (re)assign hwpipe if needed, otherwise keep old one: */
                if (new_hwpipe) {
                        /* TODO maybe we want to re-assign hwpipe sometimes
                         * in cases when we no-longer need some caps to make
                         * it available for other planes?
                         */
                        struct mdp5_hw_pipe *old_hwpipe = mdp5_state->hwpipe;
                        struct mdp5_hw_pipe *old_right_hwpipe =
                                                          mdp5_state->r_hwpipe;
                        struct mdp5_hw_pipe *new_hwpipe = NULL;
                        struct mdp5_hw_pipe *new_right_hwpipe = NULL;

                        ret = mdp5_pipe_assign(state->state, plane, caps,
                                               blkcfg, &new_hwpipe,
                                               need_right_hwpipe ?
                                               &new_right_hwpipe : NULL);
                        if (ret) {
                                DBG("%s: failed to assign hwpipe(s)!",
                                    plane->name);
                                return ret;
                        }

                        mdp5_state->hwpipe = new_hwpipe;
                        if (need_right_hwpipe)
                                mdp5_state->r_hwpipe = new_right_hwpipe;
                        else
                                /*
                                 * set it to NULL so that the driver knows we
                                 * don't have a right hwpipe when committing a
                                 * new state
                                 */
                                mdp5_state->r_hwpipe = NULL;


                        mdp5_pipe_release(state->state, old_hwpipe);
                        mdp5_pipe_release(state->state, old_right_hwpipe);
                }
        } else {
                mdp5_pipe_release(state->state, mdp5_state->hwpipe);
                mdp5_pipe_release(state->state, mdp5_state->r_hwpipe);
                mdp5_state->hwpipe = mdp5_state->r_hwpipe = NULL;
        }

        return 0;
}

static int mdp5_plane_atomic_check(struct drm_plane *plane,
                                   struct drm_atomic_state *state)
{
        struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state,
                                                                                 plane);
        struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
                                                                                 plane);
        struct drm_crtc *crtc;
        struct drm_crtc_state *crtc_state;

        crtc = new_plane_state->crtc ? new_plane_state->crtc : old_plane_state->crtc;
        if (!crtc)
                return 0;

        crtc_state = drm_atomic_get_existing_crtc_state(state,
                                                        crtc);
        if (WARN_ON(!crtc_state))
                return -EINVAL;

        return mdp5_plane_atomic_check_with_state(crtc_state, new_plane_state);
}

static void mdp5_plane_atomic_update(struct drm_plane *plane,
                                     struct drm_atomic_state *state)
{
        struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
                                                                           plane);

        DBG("%s: update", plane->name);

        if (plane_enabled(new_state)) {
                int ret;

                ret = mdp5_plane_mode_set(plane,
                                new_state->crtc, new_state->fb,
                                &new_state->src, &new_state->dst);
                /* atomic_check should have ensured that this doesn't fail */
                WARN_ON(ret < 0);
        }
}

static int mdp5_plane_atomic_async_check(struct drm_plane *plane,
                                         struct drm_atomic_state *state)
{
        struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
                                                                                 plane);
        struct mdp5_plane_state *mdp5_state = to_mdp5_plane_state(new_plane_state);
        struct drm_crtc_state *crtc_state;
        int min_scale, max_scale;
        int ret;

        crtc_state = drm_atomic_get_existing_crtc_state(state,
                                                        new_plane_state->crtc);
        if (WARN_ON(!crtc_state))
                return -EINVAL;

        if (!crtc_state->active)
                return -EINVAL;

        mdp5_state = to_mdp5_plane_state(new_plane_state);

        /* don't use fast path if we don't have a hwpipe allocated yet */
        if (!mdp5_state->hwpipe)
                return -EINVAL;

        /* only allow changing of position(crtc x/y or src x/y) in fast path */
        if (plane->state->crtc != new_plane_state->crtc ||
            plane->state->src_w != new_plane_state->src_w ||
            plane->state->src_h != new_plane_state->src_h ||
            plane->state->crtc_w != new_plane_state->crtc_w ||
            plane->state->crtc_h != new_plane_state->crtc_h ||
            !plane->state->fb ||
            plane->state->fb != new_plane_state->fb)
                return -EINVAL;

        min_scale = FRAC_16_16(1, 8);
        max_scale = FRAC_16_16(8, 1);

        ret = drm_atomic_helper_check_plane_state(new_plane_state, crtc_state,
                                                  min_scale, max_scale,
                                                  true, true);
        if (ret)
                return ret;

        /*
         * if the visibility of the plane changes (i.e, if the cursor is
         * clipped out completely, we can't take the async path because
         * we need to stage/unstage the plane from the Layer Mixer(s). We
         * also assign/unassign the hwpipe(s) tied to the plane. We avoid
         * taking the fast path for both these reasons.
         */
        if (new_plane_state->visible != plane->state->visible)
                return -EINVAL;

        return 0;
}

static void mdp5_plane_atomic_async_update(struct drm_plane *plane,
                                           struct drm_atomic_state *state)
{
        struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
                                                                           plane);
        struct drm_framebuffer *old_fb = plane->state->fb;

        plane->state->src_x = new_state->src_x;
        plane->state->src_y = new_state->src_y;
        plane->state->crtc_x = new_state->crtc_x;
        plane->state->crtc_y = new_state->crtc_y;

        if (plane_enabled(new_state)) {
                struct mdp5_ctl *ctl;
                struct mdp5_pipeline *pipeline =
                                        mdp5_crtc_get_pipeline(new_state->crtc);
                int ret;

                ret = mdp5_plane_mode_set(plane, new_state->crtc, new_state->fb,
                                &new_state->src, &new_state->dst);
                WARN_ON(ret < 0);

                ctl = mdp5_crtc_get_ctl(new_state->crtc);

                mdp5_ctl_commit(ctl, pipeline, mdp5_plane_get_flush(plane), true);
        }

        *to_mdp5_plane_state(plane->state) =
                *to_mdp5_plane_state(new_state);

        new_state->fb = old_fb;
}

static const struct drm_plane_helper_funcs mdp5_plane_helper_funcs = {
                .prepare_fb = msm_atomic_prepare_fb,
                .cleanup_fb = mdp5_plane_cleanup_fb,
                .atomic_check = mdp5_plane_atomic_check,
                .atomic_update = mdp5_plane_atomic_update,
                .atomic_async_check = mdp5_plane_atomic_async_check,
                .atomic_async_update = mdp5_plane_atomic_async_update,
};

static void set_scanout_locked(struct mdp5_kms *mdp5_kms,
                               enum mdp5_pipe pipe,
                               struct drm_framebuffer *fb)
{
        struct msm_kms *kms = &mdp5_kms->base.base;

        mdp5_write(mdp5_kms, REG_MDP5_PIPE_SRC_STRIDE_A(pipe),
                        MDP5_PIPE_SRC_STRIDE_A_P0(fb->pitches[0]) |
                        MDP5_PIPE_SRC_STRIDE_A_P1(fb->pitches[1]));

        mdp5_write(mdp5_kms, REG_MDP5_PIPE_SRC_STRIDE_B(pipe),
                        MDP5_PIPE_SRC_STRIDE_B_P2(fb->pitches[2]) |
                        MDP5_PIPE_SRC_STRIDE_B_P3(fb->pitches[3]));

        mdp5_write(mdp5_kms, REG_MDP5_PIPE_SRC0_ADDR(pipe),
                        msm_framebuffer_iova(fb, kms->aspace, 0));
        mdp5_write(mdp5_kms, REG_MDP5_PIPE_SRC1_ADDR(pipe),
                        msm_framebuffer_iova(fb, kms->aspace, 1));
        mdp5_write(mdp5_kms, REG_MDP5_PIPE_SRC2_ADDR(pipe),
                        msm_framebuffer_iova(fb, kms->aspace, 2));
        mdp5_write(mdp5_kms, REG_MDP5_PIPE_SRC3_ADDR(pipe),
                        msm_framebuffer_iova(fb, kms->aspace, 3));
}

/* Note: mdp5_plane->pipe_lock must be locked */
static void csc_disable(struct mdp5_kms *mdp5_kms, enum mdp5_pipe pipe)
{
        uint32_t value = mdp5_read(mdp5_kms, REG_MDP5_PIPE_OP_MODE(pipe)) &
                         ~MDP5_PIPE_OP_MODE_CSC_1_EN;

        mdp5_write(mdp5_kms, REG_MDP5_PIPE_OP_MODE(pipe), value);
}

/* Note: mdp5_plane->pipe_lock must be locked */
static void csc_enable(struct mdp5_kms *mdp5_kms, enum mdp5_pipe pipe,
                struct csc_cfg *csc)
{
        uint32_t  i, mode = 0; /* RGB, no CSC */
        uint32_t *matrix;

        if (unlikely(!csc))
                return;

        if ((csc->type == CSC_YUV2RGB) || (CSC_YUV2YUV == csc->type))
                mode |= MDP5_PIPE_OP_MODE_CSC_SRC_DATA_FORMAT(DATA_FORMAT_YUV);
        if ((csc->type == CSC_RGB2YUV) || (CSC_YUV2YUV == csc->type))
                mode |= MDP5_PIPE_OP_MODE_CSC_DST_DATA_FORMAT(DATA_FORMAT_YUV);
        mode |= MDP5_PIPE_OP_MODE_CSC_1_EN;
        mdp5_write(mdp5_kms, REG_MDP5_PIPE_OP_MODE(pipe), mode);

        matrix = csc->matrix;
        mdp5_write(mdp5_kms, REG_MDP5_PIPE_CSC_1_MATRIX_COEFF_0(pipe),
                        MDP5_PIPE_CSC_1_MATRIX_COEFF_0_COEFF_11(matrix[0]) |
                        MDP5_PIPE_CSC_1_MATRIX_COEFF_0_COEFF_12(matrix[1]));
        mdp5_write(mdp5_kms, REG_MDP5_PIPE_CSC_1_MATRIX_COEFF_1(pipe),
                        MDP5_PIPE_CSC_1_MATRIX_COEFF_1_COEFF_13(matrix[2]) |
                        MDP5_PIPE_CSC_1_MATRIX_COEFF_1_COEFF_21(matrix[3]));
        mdp5_write(mdp5_kms, REG_MDP5_PIPE_CSC_1_MATRIX_COEFF_2(pipe),
                        MDP5_PIPE_CSC_1_MATRIX_COEFF_2_COEFF_22(matrix[4]) |
                        MDP5_PIPE_CSC_1_MATRIX_COEFF_2_COEFF_23(matrix[5]));
        mdp5_write(mdp5_kms, REG_MDP5_PIPE_CSC_1_MATRIX_COEFF_3(pipe),
                        MDP5_PIPE_CSC_1_MATRIX_COEFF_3_COEFF_31(matrix[6]) |
                        MDP5_PIPE_CSC_1_MATRIX_COEFF_3_COEFF_32(matrix[7]));
        mdp5_write(mdp5_kms, REG_MDP5_PIPE_CSC_1_MATRIX_COEFF_4(pipe),
                        MDP5_PIPE_CSC_1_MATRIX_COEFF_4_COEFF_33(matrix[8]));

        for (i = 0; i < ARRAY_SIZE(csc->pre_bias); i++) {
                uint32_t *pre_clamp = csc->pre_clamp;
                uint32_t *post_clamp = csc->post_clamp;

                mdp5_write(mdp5_kms, REG_MDP5_PIPE_CSC_1_PRE_CLAMP(pipe, i),
                        MDP5_PIPE_CSC_1_PRE_CLAMP_REG_HIGH(pre_clamp[2*i+1]) |
                        MDP5_PIPE_CSC_1_PRE_CLAMP_REG_LOW(pre_clamp[2*i]));

                mdp5_write(mdp5_kms, REG_MDP5_PIPE_CSC_1_POST_CLAMP(pipe, i),
                        MDP5_PIPE_CSC_1_POST_CLAMP_REG_HIGH(post_clamp[2*i+1]) |
                        MDP5_PIPE_CSC_1_POST_CLAMP_REG_LOW(post_clamp[2*i]));

                mdp5_write(mdp5_kms, REG_MDP5_PIPE_CSC_1_PRE_BIAS(pipe, i),
                        MDP5_PIPE_CSC_1_PRE_BIAS_REG_VALUE(csc->pre_bias[i]));

                mdp5_write(mdp5_kms, REG_MDP5_PIPE_CSC_1_POST_BIAS(pipe, i),
                        MDP5_PIPE_CSC_1_POST_BIAS_REG_VALUE(csc->post_bias[i]));
        }
}

#define PHASE_STEP_SHIFT        21
#define DOWN_SCALE_RATIO_MAX    32      /* 2^(26-21) */

static int calc_phase_step(uint32_t src, uint32_t dst, uint32_t *out_phase)
{
        uint32_t unit;

        if (src == 0 || dst == 0)
                return -EINVAL;

        /*
         * PHASE_STEP_X/Y is coded on 26 bits (25:0),
         * where 2^21 represents the unity "1" in fixed-point hardware design.
         * This leaves 5 bits for the integer part (downscale case):
         *      -> maximum downscale ratio = 0b1_1111 = 31
         */
        if (src > (dst * DOWN_SCALE_RATIO_MAX))
                return -EOVERFLOW;

        unit = 1 << PHASE_STEP_SHIFT;
        *out_phase = mult_frac(unit, src, dst);

        return 0;
}

static int calc_scalex_steps(struct drm_plane *plane,
                uint32_t pixel_format, uint32_t src, uint32_t dest,
                uint32_t phasex_steps[COMP_MAX])
{
        const struct drm_format_info *info = drm_format_info(pixel_format);
        struct mdp5_kms *mdp5_kms = get_kms(plane);
        struct device *dev = mdp5_kms->dev->dev;
        uint32_t phasex_step;
        int ret;

        ret = calc_phase_step(src, dest, &phasex_step);
        if (ret) {
                DRM_DEV_ERROR(dev, "X scaling (%d->%d) failed: %d\n", src, dest, ret);
                return ret;
        }

        phasex_steps[COMP_0]   = phasex_step;
        phasex_steps[COMP_3]   = phasex_step;
        phasex_steps[COMP_1_2] = phasex_step / info->hsub;

        return 0;
}

static int calc_scaley_steps(struct drm_plane *plane,
                uint32_t pixel_format, uint32_t src, uint32_t dest,
                uint32_t phasey_steps[COMP_MAX])
{
        const struct drm_format_info *info = drm_format_info(pixel_format);
        struct mdp5_kms *mdp5_kms = get_kms(plane);
        struct device *dev = mdp5_kms->dev->dev;
        uint32_t phasey_step;
        int ret;

        ret = calc_phase_step(src, dest, &phasey_step);
        if (ret) {
                DRM_DEV_ERROR(dev, "Y scaling (%d->%d) failed: %d\n", src, dest, ret);
                return ret;
        }

        phasey_steps[COMP_0]   = phasey_step;
        phasey_steps[COMP_3]   = phasey_step;
        phasey_steps[COMP_1_2] = phasey_step / info->vsub;

        return 0;
}

static uint32_t get_scale_config(const struct mdp_format *format,
                uint32_t src, uint32_t dst, bool horz)
{
        const struct drm_format_info *info = drm_format_info(format->base.pixel_format);
        bool scaling = format->is_yuv ? true : (src != dst);
        uint32_t sub;
        uint32_t ya_filter, uv_filter;
        bool yuv = format->is_yuv;

        if (!scaling)
                return 0;

        if (yuv) {
                sub = horz ? info->hsub : info->vsub;
                uv_filter = ((src / sub) <= dst) ?
                                   SCALE_FILTER_BIL : SCALE_FILTER_PCMN;
        }
        ya_filter = (src <= dst) ? SCALE_FILTER_BIL : SCALE_FILTER_PCMN;

        if (horz)
                return  MDP5_PIPE_SCALE_CONFIG_SCALEX_EN |
                        MDP5_PIPE_SCALE_CONFIG_SCALEX_FILTER_COMP_0(ya_filter) |
                        MDP5_PIPE_SCALE_CONFIG_SCALEX_FILTER_COMP_3(ya_filter) |
                        COND(yuv, MDP5_PIPE_SCALE_CONFIG_SCALEX_FILTER_COMP_1_2(uv_filter));
        else
                return  MDP5_PIPE_SCALE_CONFIG_SCALEY_EN |
                        MDP5_PIPE_SCALE_CONFIG_SCALEY_FILTER_COMP_0(ya_filter) |
                        MDP5_PIPE_SCALE_CONFIG_SCALEY_FILTER_COMP_3(ya_filter) |
                        COND(yuv, MDP5_PIPE_SCALE_CONFIG_SCALEY_FILTER_COMP_1_2(uv_filter));
}

static void calc_pixel_ext(const struct mdp_format *format,
                uint32_t src, uint32_t dst, uint32_t phase_step[2],
                int pix_ext_edge1[COMP_MAX], int pix_ext_edge2[COMP_MAX],
                bool horz)
{
        bool scaling = format->is_yuv ? true : (src != dst);
        int i;

        /*
         * Note:
         * We assume here that:
         *     1. PCMN filter is used for downscale
         *     2. bilinear filter is used for upscale
         *     3. we are in a single pipe configuration
         */

        for (i = 0; i < COMP_MAX; i++) {
                pix_ext_edge1[i] = 0;
                pix_ext_edge2[i] = scaling ? 1 : 0;
        }
}

static void mdp5_write_pixel_ext(struct mdp5_kms *mdp5_kms, enum mdp5_pipe pipe,
        const struct mdp_format *format,
        uint32_t src_w, int pe_left[COMP_MAX], int pe_right[COMP_MAX],
        uint32_t src_h, int pe_top[COMP_MAX], int pe_bottom[COMP_MAX])
{
        const struct drm_format_info *info = drm_format_info(format->base.pixel_format);
        uint32_t lr, tb, req;
        int i;

        for (i = 0; i < COMP_MAX; i++) {
                uint32_t roi_w = src_w;
                uint32_t roi_h = src_h;

                if (format->is_yuv && i == COMP_1_2) {
                        roi_w /= info->hsub;
                        roi_h /= info->vsub;
                }

                lr  = (pe_left[i] >= 0) ?
                        MDP5_PIPE_SW_PIX_EXT_LR_LEFT_RPT(pe_left[i]) :
                        MDP5_PIPE_SW_PIX_EXT_LR_LEFT_OVF(pe_left[i]);

                lr |= (pe_right[i] >= 0) ?
                        MDP5_PIPE_SW_PIX_EXT_LR_RIGHT_RPT(pe_right[i]) :
                        MDP5_PIPE_SW_PIX_EXT_LR_RIGHT_OVF(pe_right[i]);

                tb  = (pe_top[i] >= 0) ?
                        MDP5_PIPE_SW_PIX_EXT_TB_TOP_RPT(pe_top[i]) :
                        MDP5_PIPE_SW_PIX_EXT_TB_TOP_OVF(pe_top[i]);

                tb |= (pe_bottom[i] >= 0) ?
                        MDP5_PIPE_SW_PIX_EXT_TB_BOTTOM_RPT(pe_bottom[i]) :
                        MDP5_PIPE_SW_PIX_EXT_TB_BOTTOM_OVF(pe_bottom[i]);

                req  = MDP5_PIPE_SW_PIX_EXT_REQ_PIXELS_LEFT_RIGHT(roi_w +
                                pe_left[i] + pe_right[i]);

                req |= MDP5_PIPE_SW_PIX_EXT_REQ_PIXELS_TOP_BOTTOM(roi_h +
                                pe_top[i] + pe_bottom[i]);

                mdp5_write(mdp5_kms, REG_MDP5_PIPE_SW_PIX_EXT_LR(pipe, i), lr);
                mdp5_write(mdp5_kms, REG_MDP5_PIPE_SW_PIX_EXT_TB(pipe, i), tb);
                mdp5_write(mdp5_kms, REG_MDP5_PIPE_SW_PIX_EXT_REQ_PIXELS(pipe, i), req);

                DBG("comp-%d (L/R): rpt=%d/%d, ovf=%d/%d, req=%d", i,
                        FIELD(lr,  MDP5_PIPE_SW_PIX_EXT_LR_LEFT_RPT),
                        FIELD(lr,  MDP5_PIPE_SW_PIX_EXT_LR_RIGHT_RPT),
                        FIELD(lr,  MDP5_PIPE_SW_PIX_EXT_LR_LEFT_OVF),
                        FIELD(lr,  MDP5_PIPE_SW_PIX_EXT_LR_RIGHT_OVF),
                        FIELD(req, MDP5_PIPE_SW_PIX_EXT_REQ_PIXELS_LEFT_RIGHT));

                DBG("comp-%d (T/B): rpt=%d/%d, ovf=%d/%d, req=%d", i,
                        FIELD(tb,  MDP5_PIPE_SW_PIX_EXT_TB_TOP_RPT),
                        FIELD(tb,  MDP5_PIPE_SW_PIX_EXT_TB_BOTTOM_RPT),
                        FIELD(tb,  MDP5_PIPE_SW_PIX_EXT_TB_TOP_OVF),
                        FIELD(tb,  MDP5_PIPE_SW_PIX_EXT_TB_BOTTOM_OVF),
                        FIELD(req, MDP5_PIPE_SW_PIX_EXT_REQ_PIXELS_TOP_BOTTOM));
        }
}

struct pixel_ext {
        int left[COMP_MAX];
        int right[COMP_MAX];
        int top[COMP_MAX];
        int bottom[COMP_MAX];
};

struct phase_step {
        u32 x[COMP_MAX];
        u32 y[COMP_MAX];
};

static void mdp5_hwpipe_mode_set(struct mdp5_kms *mdp5_kms,
                                 struct mdp5_hw_pipe *hwpipe,
                                 struct drm_framebuffer *fb,
                                 struct phase_step *step,
                                 struct pixel_ext *pe,
                                 u32 scale_config, u32 hdecm, u32 vdecm,
                                 bool hflip, bool vflip,
                                 int crtc_x, int crtc_y,
                                 unsigned int crtc_w, unsigned int crtc_h,
                                 u32 src_img_w, u32 src_img_h,
                                 u32 src_x, u32 src_y,
                                 u32 src_w, u32 src_h)
{
        enum mdp5_pipe pipe = hwpipe->pipe;
        bool has_pe = hwpipe->caps & MDP_PIPE_CAP_SW_PIX_EXT;
        const struct mdp_format *format =
                        to_mdp_format(msm_framebuffer_format(fb));

        mdp5_write(mdp5_kms, REG_MDP5_PIPE_SRC_IMG_SIZE(pipe),
                        MDP5_PIPE_SRC_IMG_SIZE_WIDTH(src_img_w) |
                        MDP5_PIPE_SRC_IMG_SIZE_HEIGHT(src_img_h));

        mdp5_write(mdp5_kms, REG_MDP5_PIPE_SRC_SIZE(pipe),
                        MDP5_PIPE_SRC_SIZE_WIDTH(src_w) |
                        MDP5_PIPE_SRC_SIZE_HEIGHT(src_h));

        mdp5_write(mdp5_kms, REG_MDP5_PIPE_SRC_XY(pipe),
                        MDP5_PIPE_SRC_XY_X(src_x) |
                        MDP5_PIPE_SRC_XY_Y(src_y));

        mdp5_write(mdp5_kms, REG_MDP5_PIPE_OUT_SIZE(pipe),
                        MDP5_PIPE_OUT_SIZE_WIDTH(crtc_w) |
                        MDP5_PIPE_OUT_SIZE_HEIGHT(crtc_h));

        mdp5_write(mdp5_kms, REG_MDP5_PIPE_OUT_XY(pipe),
                        MDP5_PIPE_OUT_XY_X(crtc_x) |
                        MDP5_PIPE_OUT_XY_Y(crtc_y));

        mdp5_write(mdp5_kms, REG_MDP5_PIPE_SRC_FORMAT(pipe),
                        MDP5_PIPE_SRC_FORMAT_A_BPC(format->bpc_a) |
                        MDP5_PIPE_SRC_FORMAT_R_BPC(format->bpc_r) |
                        MDP5_PIPE_SRC_FORMAT_G_BPC(format->bpc_g) |
                        MDP5_PIPE_SRC_FORMAT_B_BPC(format->bpc_b) |
                        COND(format->alpha_enable, MDP5_PIPE_SRC_FORMAT_ALPHA_ENABLE) |
                        MDP5_PIPE_SRC_FORMAT_CPP(format->cpp - 1) |
                        MDP5_PIPE_SRC_FORMAT_UNPACK_COUNT(format->unpack_count - 1) |
                        COND(format->unpack_tight, MDP5_PIPE_SRC_FORMAT_UNPACK_TIGHT) |
                        MDP5_PIPE_SRC_FORMAT_FETCH_TYPE(format->fetch_type) |
                        MDP5_PIPE_SRC_FORMAT_CHROMA_SAMP(format->chroma_sample));

        mdp5_write(mdp5_kms, REG_MDP5_PIPE_SRC_UNPACK(pipe),
                        MDP5_PIPE_SRC_UNPACK_ELEM0(format->unpack[0]) |
                        MDP5_PIPE_SRC_UNPACK_ELEM1(format->unpack[1]) |
                        MDP5_PIPE_SRC_UNPACK_ELEM2(format->unpack[2]) |
                        MDP5_PIPE_SRC_UNPACK_ELEM3(format->unpack[3]));

        mdp5_write(mdp5_kms, REG_MDP5_PIPE_SRC_OP_MODE(pipe),
                        (hflip ? MDP5_PIPE_SRC_OP_MODE_FLIP_LR : 0) |
                        (vflip ? MDP5_PIPE_SRC_OP_MODE_FLIP_UD : 0) |
                        COND(has_pe, MDP5_PIPE_SRC_OP_MODE_SW_PIX_EXT_OVERRIDE) |
                        MDP5_PIPE_SRC_OP_MODE_BWC(BWC_LOSSLESS));

        /* not using secure mode: */
        mdp5_write(mdp5_kms, REG_MDP5_PIPE_SRC_ADDR_SW_STATUS(pipe), 0);

        if (hwpipe->caps & MDP_PIPE_CAP_SW_PIX_EXT)
                mdp5_write_pixel_ext(mdp5_kms, pipe, format,
                                src_w, pe->left, pe->right,
                                src_h, pe->top, pe->bottom);

        if (hwpipe->caps & MDP_PIPE_CAP_SCALE) {
                mdp5_write(mdp5_kms, REG_MDP5_PIPE_SCALE_PHASE_STEP_X(pipe),
                                step->x[COMP_0]);
                mdp5_write(mdp5_kms, REG_MDP5_PIPE_SCALE_PHASE_STEP_Y(pipe),
                                step->y[COMP_0]);
                mdp5_write(mdp5_kms, REG_MDP5_PIPE_SCALE_CR_PHASE_STEP_X(pipe),
                                step->x[COMP_1_2]);
                mdp5_write(mdp5_kms, REG_MDP5_PIPE_SCALE_CR_PHASE_STEP_Y(pipe),
                                step->y[COMP_1_2]);
                mdp5_write(mdp5_kms, REG_MDP5_PIPE_DECIMATION(pipe),
                                MDP5_PIPE_DECIMATION_VERT(vdecm) |
                                MDP5_PIPE_DECIMATION_HORZ(hdecm));
                mdp5_write(mdp5_kms, REG_MDP5_PIPE_SCALE_CONFIG(pipe),
                           scale_config);
        }

        if (hwpipe->caps & MDP_PIPE_CAP_CSC) {
                if (MDP_FORMAT_IS_YUV(format))
                        csc_enable(mdp5_kms, pipe,
                                        mdp_get_default_csc_cfg(CSC_YUV2RGB));
                else
                        csc_disable(mdp5_kms, pipe);
        }

        set_scanout_locked(mdp5_kms, pipe, fb);
}

static int mdp5_plane_mode_set(struct drm_plane *plane,
                struct drm_crtc *crtc, struct drm_framebuffer *fb,
                struct drm_rect *src, struct drm_rect *dest)
{
        struct drm_plane_state *pstate = plane->state;
        struct mdp5_hw_pipe *hwpipe = to_mdp5_plane_state(pstate)->hwpipe;
        struct mdp5_kms *mdp5_kms = get_kms(plane);
        enum mdp5_pipe pipe = hwpipe->pipe;
        struct mdp5_hw_pipe *right_hwpipe;
        const struct mdp_format *format;
        uint32_t nplanes, config = 0;
        struct phase_step step = { { 0 } };
        struct pixel_ext pe = { { 0 } };
        uint32_t hdecm = 0, vdecm = 0;
        uint32_t pix_format;
        unsigned int rotation;
        bool vflip, hflip;
        int crtc_x, crtc_y;
        unsigned int crtc_w, crtc_h;
        uint32_t src_x, src_y;
        uint32_t src_w, src_h;
        uint32_t src_img_w, src_img_h;
        int ret;

        nplanes = fb->format->num_planes;

        /* bad formats should already be rejected: */
        if (WARN_ON(nplanes > pipe2nclients(pipe)))
                return -EINVAL;

        format = to_mdp_format(msm_framebuffer_format(fb));
        pix_format = format->base.pixel_format;

        src_x = src->x1;
        src_y = src->y1;
        src_w = drm_rect_width(src);
        src_h = drm_rect_height(src);

        crtc_x = dest->x1;
        crtc_y = dest->y1;
        crtc_w = drm_rect_width(dest);
        crtc_h = drm_rect_height(dest);

        /* src values are in Q16 fixed point, convert to integer: */
        src_x = src_x >> 16;
        src_y = src_y >> 16;
        src_w = src_w >> 16;
        src_h = src_h >> 16;

        src_img_w = min(fb->width, src_w);
        src_img_h = min(fb->height, src_h);

        DBG("%s: FB[%u] %u,%u,%u,%u -> CRTC[%u] %d,%d,%u,%u", plane->name,
                        fb->base.id, src_x, src_y, src_w, src_h,
                        crtc->base.id, crtc_x, crtc_y, crtc_w, crtc_h);

        right_hwpipe = to_mdp5_plane_state(pstate)->r_hwpipe;
        if (right_hwpipe) {
                /*
                 * if the plane comprises of 2 hw pipes, assume that the width
                 * is split equally across them. The only parameters that varies
                 * between the 2 pipes are src_x and crtc_x
                 */
                crtc_w /= 2;
                src_w /= 2;
                src_img_w /= 2;
        }

        ret = calc_scalex_steps(plane, pix_format, src_w, crtc_w, step.x);
        if (ret)
                return ret;

        ret = calc_scaley_steps(plane, pix_format, src_h, crtc_h, step.y);
        if (ret)
                return ret;

        if (hwpipe->caps & MDP_PIPE_CAP_SW_PIX_EXT) {
                calc_pixel_ext(format, src_w, crtc_w, step.x,
                               pe.left, pe.right, true);
                calc_pixel_ext(format, src_h, crtc_h, step.y,
                               pe.top, pe.bottom, false);
        }

        /* TODO calc hdecm, vdecm */

        /* SCALE is used to both scale and up-sample chroma components */
        config |= get_scale_config(format, src_w, crtc_w, true);
        config |= get_scale_config(format, src_h, crtc_h, false);
        DBG("scale config = %x", config);

        rotation = drm_rotation_simplify(pstate->rotation,
                                         DRM_MODE_ROTATE_0 |
                                         DRM_MODE_REFLECT_X |
                                         DRM_MODE_REFLECT_Y);
        hflip = !!(rotation & DRM_MODE_REFLECT_X);
        vflip = !!(rotation & DRM_MODE_REFLECT_Y);

        mdp5_hwpipe_mode_set(mdp5_kms, hwpipe, fb, &step, &pe,
                             config, hdecm, vdecm, hflip, vflip,
                             crtc_x, crtc_y, crtc_w, crtc_h,
                             src_img_w, src_img_h,
                             src_x, src_y, src_w, src_h);
        if (right_hwpipe)
                mdp5_hwpipe_mode_set(mdp5_kms, right_hwpipe, fb, &step, &pe,
                                     config, hdecm, vdecm, hflip, vflip,
                                     crtc_x + crtc_w, crtc_y, crtc_w, crtc_h,
                                     src_img_w, src_img_h,
                                     src_x + src_w, src_y, src_w, src_h);

        return ret;
}

/*
 * Use this func and the one below only after the atomic state has been
 * successfully swapped
 */
enum mdp5_pipe mdp5_plane_pipe(struct drm_plane *plane)
{
        struct mdp5_plane_state *pstate = to_mdp5_plane_state(plane->state);

        if (WARN_ON(!pstate->hwpipe))
                return SSPP_NONE;

        return pstate->hwpipe->pipe;
}

enum mdp5_pipe mdp5_plane_right_pipe(struct drm_plane *plane)
{
        struct mdp5_plane_state *pstate = to_mdp5_plane_state(plane->state);

        if (!pstate->r_hwpipe)
                return SSPP_NONE;

        return pstate->r_hwpipe->pipe;
}

uint32_t mdp5_plane_get_flush(struct drm_plane *plane)
{
        struct mdp5_plane_state *pstate = to_mdp5_plane_state(plane->state);
        u32 mask;

        if (WARN_ON(!pstate->hwpipe))
                return 0;

        mask = pstate->hwpipe->flush_mask;

        if (pstate->r_hwpipe)
                mask |= pstate->r_hwpipe->flush_mask;

        return mask;
}

/* initialize plane */
struct drm_plane *mdp5_plane_init(struct drm_device *dev,
                                  enum drm_plane_type type)
{
        struct drm_plane *plane = NULL;
        struct mdp5_plane *mdp5_plane;
        int ret;

        mdp5_plane = kzalloc(sizeof(*mdp5_plane), GFP_KERNEL);
        if (!mdp5_plane) {
                ret = -ENOMEM;
                goto fail;
        }

        plane = &mdp5_plane->base;

        mdp5_plane->nformats = mdp_get_formats(mdp5_plane->formats,
                ARRAY_SIZE(mdp5_plane->formats), false);

        ret = drm_universal_plane_init(dev, plane, 0xff, &mdp5_plane_funcs,
                        mdp5_plane->formats, mdp5_plane->nformats,
                        NULL, type, NULL);

        if (ret)
                goto fail;

        drm_plane_helper_add(plane, &mdp5_plane_helper_funcs);

        mdp5_plane_install_properties(plane, &plane->base);

        drm_plane_enable_fb_damage_clips(plane);

        return plane;

fail:
        if (plane)
                mdp5_plane_destroy(plane);

        return ERR_PTR(ret);
}