/*
 * Copyright (c) 2014, The Linux Foundation. All rights reserved.
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */


#include "msm_drv.h"
#include "msm_mmu.h"
#include "mdp5_kms.h"

static const char *iommu_ports[] = {
                "mdp_0",
};

static int mdp5_hw_init(struct msm_kms *kms)
{
        struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
        struct drm_device *dev = mdp5_kms->dev;
        unsigned long flags;

        pm_runtime_get_sync(dev->dev);

        /* Magic unknown register writes:
         *
         *    W VBIF:0x004 00000001      (mdss_mdp.c:839)
         *    W MDP5:0x2e0 0xe9          (mdss_mdp.c:839)
         *    W MDP5:0x2e4 0x55          (mdss_mdp.c:839)
         *    W MDP5:0x3ac 0xc0000ccc    (mdss_mdp.c:839)
         *    W MDP5:0x3b4 0xc0000ccc    (mdss_mdp.c:839)
         *    W MDP5:0x3bc 0xcccccc      (mdss_mdp.c:839)
         *    W MDP5:0x4a8 0xcccc0c0     (mdss_mdp.c:839)
         *    W MDP5:0x4b0 0xccccc0c0    (mdss_mdp.c:839)
         *    W MDP5:0x4b8 0xccccc000    (mdss_mdp.c:839)
         *
         * Downstream fbdev driver gets these register offsets/values
         * from DT.. not really sure what these registers are or if
         * different values for different boards/SoC's, etc.  I guess
         * they are the golden registers.
         *
         * Not setting these does not seem to cause any problem.  But
         * we may be getting lucky with the bootloader initializing
         * them for us.  OTOH, if we can always count on the bootloader
         * setting the golden registers, then perhaps we don't need to
         * care.
         */

        spin_lock_irqsave(&mdp5_kms->resource_lock, flags);
        mdp5_write(mdp5_kms, REG_MDP5_MDP_DISP_INTF_SEL(0), 0);
        spin_unlock_irqrestore(&mdp5_kms->resource_lock, flags);

        mdp5_ctlm_hw_reset(mdp5_kms->ctlm);

        pm_runtime_put_sync(dev->dev);

        return 0;
}

static void mdp5_prepare_commit(struct msm_kms *kms, struct drm_atomic_state *state)
{
        struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
        mdp5_enable(mdp5_kms);
}

static void mdp5_complete_commit(struct msm_kms *kms, struct drm_atomic_state *state)
{
        int i;
        struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
        int nplanes = mdp5_kms->dev->mode_config.num_total_plane;

        for (i = 0; i < nplanes; i++) {
                struct drm_plane *plane = state->planes[i];
                struct drm_plane_state *plane_state = state->plane_states[i];

                if (!plane)
                        continue;

                mdp5_plane_complete_commit(plane, plane_state);
        }

        mdp5_disable(mdp5_kms);
}

static void mdp5_wait_for_crtc_commit_done(struct msm_kms *kms,
                                                struct drm_crtc *crtc)
{
        mdp5_crtc_wait_for_commit_done(crtc);
}

static long mdp5_round_pixclk(struct msm_kms *kms, unsigned long rate,
                struct drm_encoder *encoder)
{
        return rate;
}

static int mdp5_set_split_display(struct msm_kms *kms,
                struct drm_encoder *encoder,
                struct drm_encoder *slave_encoder,
                bool is_cmd_mode)
{
        if (is_cmd_mode)
                return mdp5_cmd_encoder_set_split_display(encoder,
                                                        slave_encoder);
        else
                return mdp5_encoder_set_split_display(encoder, slave_encoder);
}

static void mdp5_destroy(struct msm_kms *kms)
{
        struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
        struct msm_mmu *mmu = mdp5_kms->mmu;

        mdp5_irq_domain_fini(mdp5_kms);

        if (mmu) {
                mmu->funcs->detach(mmu, iommu_ports, ARRAY_SIZE(iommu_ports));
                mmu->funcs->destroy(mmu);
        }

        if (mdp5_kms->ctlm)
                mdp5_ctlm_destroy(mdp5_kms->ctlm);
        if (mdp5_kms->smp)
                mdp5_smp_destroy(mdp5_kms->smp);
        if (mdp5_kms->cfg)
                mdp5_cfg_destroy(mdp5_kms->cfg);

        kfree(mdp5_kms);
}

static const struct mdp_kms_funcs kms_funcs = {
        .base = {
                .hw_init         = mdp5_hw_init,
                .irq_preinstall  = mdp5_irq_preinstall,
                .irq_postinstall = mdp5_irq_postinstall,
                .irq_uninstall   = mdp5_irq_uninstall,
                .irq             = mdp5_irq,
                .enable_vblank   = mdp5_enable_vblank,
                .disable_vblank  = mdp5_disable_vblank,
                .prepare_commit  = mdp5_prepare_commit,
                .complete_commit = mdp5_complete_commit,
                .wait_for_crtc_commit_done = mdp5_wait_for_crtc_commit_done,
                .get_format      = mdp_get_format,
                .round_pixclk    = mdp5_round_pixclk,
                .set_split_display = mdp5_set_split_display,
                .destroy         = mdp5_destroy,
        },
        .set_irqmask         = mdp5_set_irqmask,
};

int mdp5_disable(struct mdp5_kms *mdp5_kms)
{
        DBG("");

        clk_disable_unprepare(mdp5_kms->ahb_clk);
        clk_disable_unprepare(mdp5_kms->axi_clk);
        clk_disable_unprepare(mdp5_kms->core_clk);
        if (mdp5_kms->lut_clk)
                clk_disable_unprepare(mdp5_kms->lut_clk);

        return 0;
}

int mdp5_enable(struct mdp5_kms *mdp5_kms)
{
        DBG("");

        clk_prepare_enable(mdp5_kms->ahb_clk);
        clk_prepare_enable(mdp5_kms->axi_clk);
        clk_prepare_enable(mdp5_kms->core_clk);
        if (mdp5_kms->lut_clk)
                clk_prepare_enable(mdp5_kms->lut_clk);

        return 0;
}

static struct drm_encoder *construct_encoder(struct mdp5_kms *mdp5_kms,
                enum mdp5_intf_type intf_type, int intf_num,
                enum mdp5_intf_mode intf_mode, struct mdp5_ctl *ctl)
{
        struct drm_device *dev = mdp5_kms->dev;
        struct msm_drm_private *priv = dev->dev_private;
        struct drm_encoder *encoder;
        struct mdp5_interface intf = {
                        .num    = intf_num,
                        .type   = intf_type,
                        .mode   = intf_mode,
        };

        if ((intf_type == INTF_DSI) &&
                (intf_mode == MDP5_INTF_DSI_MODE_COMMAND))
                encoder = mdp5_cmd_encoder_init(dev, &intf, ctl);
        else
                encoder = mdp5_encoder_init(dev, &intf, ctl);

        if (IS_ERR(encoder)) {
                dev_err(dev->dev, "failed to construct encoder\n");
                return encoder;
        }

        encoder->possible_crtcs = (1 << priv->num_crtcs) - 1;
        priv->encoders[priv->num_encoders++] = encoder;

        return encoder;
}

static int get_dsi_id_from_intf(const struct mdp5_cfg_hw *hw_cfg, int intf_num)
{
        const enum mdp5_intf_type *intfs = hw_cfg->intf.connect;
        const int intf_cnt = ARRAY_SIZE(hw_cfg->intf.connect);
        int id = 0, i;

        for (i = 0; i < intf_cnt; i++) {
                if (intfs[i] == INTF_DSI) {
                        if (intf_num == i)
                                return id;

                        id++;
                }
        }

        return -EINVAL;
}

static int modeset_init_intf(struct mdp5_kms *mdp5_kms, int intf_num)
{
        struct drm_device *dev = mdp5_kms->dev;
        struct msm_drm_private *priv = dev->dev_private;
        const struct mdp5_cfg_hw *hw_cfg =
                                        mdp5_cfg_get_hw_config(mdp5_kms->cfg);
        enum mdp5_intf_type intf_type = hw_cfg->intf.connect[intf_num];
        struct mdp5_ctl_manager *ctlm = mdp5_kms->ctlm;
        struct mdp5_ctl *ctl;
        struct drm_encoder *encoder;
        int ret = 0;

        switch (intf_type) {
        case INTF_DISABLED:
                break;
        case INTF_eDP:
                if (!priv->edp)
                        break;

                ctl = mdp5_ctlm_request(ctlm, intf_num);
                if (!ctl) {
                        ret = -EINVAL;
                        break;
                }

                encoder = construct_encoder(mdp5_kms, INTF_eDP, intf_num,
                                        MDP5_INTF_MODE_NONE, ctl);
                if (IS_ERR(encoder)) {
                        ret = PTR_ERR(encoder);
                        break;
                }

                ret = msm_edp_modeset_init(priv->edp, dev, encoder);
                break;
        case INTF_HDMI:
                if (!priv->hdmi)
                        break;

                ctl = mdp5_ctlm_request(ctlm, intf_num);
                if (!ctl) {
                        ret = -EINVAL;
                        break;
                }

                encoder = construct_encoder(mdp5_kms, INTF_HDMI, intf_num,
                                        MDP5_INTF_MODE_NONE, ctl);
                if (IS_ERR(encoder)) {
                        ret = PTR_ERR(encoder);
                        break;
                }

                ret = msm_hdmi_modeset_init(priv->hdmi, dev, encoder);
                break;
        case INTF_DSI:
        {
                int dsi_id = get_dsi_id_from_intf(hw_cfg, intf_num);
                struct drm_encoder *dsi_encs[MSM_DSI_ENCODER_NUM];
                enum mdp5_intf_mode mode;
                int i;

                if ((dsi_id >= ARRAY_SIZE(priv->dsi)) || (dsi_id < 0)) {
                        dev_err(dev->dev, "failed to find dsi from intf %d\n",
                                intf_num);
                        ret = -EINVAL;
                        break;
                }

                if (!priv->dsi[dsi_id])
                        break;

                ctl = mdp5_ctlm_request(ctlm, intf_num);
                if (!ctl) {
                        ret = -EINVAL;
                        break;
                }

                for (i = 0; i < MSM_DSI_ENCODER_NUM; i++) {
                        mode = (i == MSM_DSI_CMD_ENCODER_ID) ?
                                MDP5_INTF_DSI_MODE_COMMAND :
                                MDP5_INTF_DSI_MODE_VIDEO;
                        dsi_encs[i] = construct_encoder(mdp5_kms, INTF_DSI,
                                                        intf_num, mode, ctl);
                        if (IS_ERR(dsi_encs[i])) {
                                ret = PTR_ERR(dsi_encs[i]);
                                break;
                        }
                }

                ret = msm_dsi_modeset_init(priv->dsi[dsi_id], dev, dsi_encs);
                break;
        }
        default:
                dev_err(dev->dev, "unknown intf: %d\n", intf_type);
                ret = -EINVAL;
                break;
        }

        return ret;
}

static int modeset_init(struct mdp5_kms *mdp5_kms)
{
        static const enum mdp5_pipe crtcs[] = {
                        SSPP_RGB0, SSPP_RGB1, SSPP_RGB2, SSPP_RGB3,
        };
        static const enum mdp5_pipe vig_planes[] = {
                        SSPP_VIG0, SSPP_VIG1, SSPP_VIG2, SSPP_VIG3,
        };
        static const enum mdp5_pipe dma_planes[] = {
                        SSPP_DMA0, SSPP_DMA1,
        };
        struct drm_device *dev = mdp5_kms->dev;
        struct msm_drm_private *priv = dev->dev_private;
        const struct mdp5_cfg_hw *hw_cfg;
        int i, ret;

        hw_cfg = mdp5_cfg_get_hw_config(mdp5_kms->cfg);

        /* register our interrupt-controller for hdmi/eDP/dsi/etc
         * to use for irqs routed through mdp:
         */
        ret = mdp5_irq_domain_init(mdp5_kms);
        if (ret)
                goto fail;

        /* construct CRTCs and their private planes: */
        for (i = 0; i < hw_cfg->pipe_rgb.count; i++) {
                struct drm_plane *plane;
                struct drm_crtc *crtc;

                plane = mdp5_plane_init(dev, crtcs[i], true,
                        hw_cfg->pipe_rgb.base[i], hw_cfg->pipe_rgb.caps);
                if (IS_ERR(plane)) {
                        ret = PTR_ERR(plane);
                        dev_err(dev->dev, "failed to construct plane for %s (%d)\n",
                                        pipe2name(crtcs[i]), ret);
                        goto fail;
                }

                crtc  = mdp5_crtc_init(dev, plane, i);
                if (IS_ERR(crtc)) {
                        ret = PTR_ERR(crtc);
                        dev_err(dev->dev, "failed to construct crtc for %s (%d)\n",
                                        pipe2name(crtcs[i]), ret);
                        goto fail;
                }
                priv->crtcs[priv->num_crtcs++] = crtc;
        }

        /* Construct video planes: */
        for (i = 0; i < hw_cfg->pipe_vig.count; i++) {
                struct drm_plane *plane;

                plane = mdp5_plane_init(dev, vig_planes[i], false,
                        hw_cfg->pipe_vig.base[i], hw_cfg->pipe_vig.caps);
                if (IS_ERR(plane)) {
                        ret = PTR_ERR(plane);
                        dev_err(dev->dev, "failed to construct %s plane: %d\n",
                                        pipe2name(vig_planes[i]), ret);
                        goto fail;
                }
        }

        /* DMA planes */
        for (i = 0; i < hw_cfg->pipe_dma.count; i++) {
                struct drm_plane *plane;

                plane = mdp5_plane_init(dev, dma_planes[i], false,
                                hw_cfg->pipe_dma.base[i], hw_cfg->pipe_dma.caps);
                if (IS_ERR(plane)) {
                        ret = PTR_ERR(plane);
                        dev_err(dev->dev, "failed to construct %s plane: %d\n",
                                        pipe2name(dma_planes[i]), ret);
                        goto fail;
                }
        }

        /* Construct encoders and modeset initialize connector devices
         * for each external display interface.
         */
        for (i = 0; i < ARRAY_SIZE(hw_cfg->intf.connect); i++) {
                ret = modeset_init_intf(mdp5_kms, i);
                if (ret)
                        goto fail;
        }

        return 0;

fail:
        return ret;
}

static void read_hw_revision(struct mdp5_kms *mdp5_kms,
                uint32_t *major, uint32_t *minor)
{
        uint32_t version;

        mdp5_enable(mdp5_kms);
        version = mdp5_read(mdp5_kms, REG_MDSS_HW_VERSION);
        mdp5_disable(mdp5_kms);

        *major = FIELD(version, MDSS_HW_VERSION_MAJOR);
        *minor = FIELD(version, MDSS_HW_VERSION_MINOR);

        DBG("MDP5 version v%d.%d", *major, *minor);
}

static int get_clk(struct platform_device *pdev, struct clk **clkp,
                const char *name, bool mandatory)
{
        struct device *dev = &pdev->dev;
        struct clk *clk = devm_clk_get(dev, name);
        if (IS_ERR(clk) && mandatory) {
                dev_err(dev, "failed to get %s (%ld)\n", name, PTR_ERR(clk));
                return PTR_ERR(clk);
        }
        if (IS_ERR(clk))
                DBG("skipping %s", name);
        else
                *clkp = clk;

        return 0;
}

static struct drm_encoder *get_encoder_from_crtc(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_encoder *encoder;

        drm_for_each_encoder(encoder, dev)
                if (encoder->crtc == crtc)
                        return encoder;

        return NULL;
}

static int mdp5_get_scanoutpos(struct drm_device *dev, unsigned int pipe,
                               unsigned int flags, int *vpos, int *hpos,
                               ktime_t *stime, ktime_t *etime,
                               const struct drm_display_mode *mode)
{
        struct msm_drm_private *priv = dev->dev_private;
        struct drm_crtc *crtc;
        struct drm_encoder *encoder;
        int line, vsw, vbp, vactive_start, vactive_end, vfp_end;
        int ret = 0;

        crtc = priv->crtcs[pipe];
        if (!crtc) {
                DRM_ERROR("Invalid crtc %d\n", pipe);
                return 0;
        }

        encoder = get_encoder_from_crtc(crtc);
        if (!encoder) {
                DRM_ERROR("no encoder found for crtc %d\n", pipe);
                return 0;
        }

        ret |= DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE;

        vsw = mode->crtc_vsync_end - mode->crtc_vsync_start;
        vbp = mode->crtc_vtotal - mode->crtc_vsync_end;

        /*
         * the line counter is 1 at the start of the VSYNC pulse and VTOTAL at
         * the end of VFP. Translate the porch values relative to the line
         * counter positions.
         */

        vactive_start = vsw + vbp + 1;

        vactive_end = vactive_start + mode->crtc_vdisplay;

        /* last scan line before VSYNC */
        vfp_end = mode->crtc_vtotal;

        if (stime)
                *stime = ktime_get();

        line = mdp5_encoder_get_linecount(encoder);

        if (line < vactive_start) {
                line -= vactive_start;
                ret |= DRM_SCANOUTPOS_IN_VBLANK;
        } else if (line > vactive_end) {
                line = line - vfp_end - vactive_start;
                ret |= DRM_SCANOUTPOS_IN_VBLANK;
        } else {
                line -= vactive_start;
        }

        *vpos = line;
        *hpos = 0;

        if (etime)
                *etime = ktime_get();

        return ret;
}

static int mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
                                     int *max_error,
                                     struct timeval *vblank_time,
                                     unsigned flags)
{
        struct msm_drm_private *priv = dev->dev_private;
        struct drm_crtc *crtc;

        if (pipe < 0 || pipe >= priv->num_crtcs) {
                DRM_ERROR("Invalid crtc %d\n", pipe);
                return -EINVAL;
        }

        crtc = priv->crtcs[pipe];
        if (!crtc) {
                DRM_ERROR("Invalid crtc %d\n", pipe);
                return -EINVAL;
        }

        return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
                                                     vblank_time, flags,
                                                     &crtc->mode);
}

static u32 mdp5_get_vblank_counter(struct drm_device *dev, unsigned int pipe)
{
        struct msm_drm_private *priv = dev->dev_private;
        struct drm_crtc *crtc;
        struct drm_encoder *encoder;

        if (pipe < 0 || pipe >= priv->num_crtcs)
                return 0;

        crtc = priv->crtcs[pipe];
        if (!crtc)
                return 0;

        encoder = get_encoder_from_crtc(crtc);
        if (!encoder)
                return 0;

        return mdp5_encoder_get_framecount(encoder);
}

struct msm_kms *mdp5_kms_init(struct drm_device *dev)
{
        struct platform_device *pdev = dev->platformdev;
        struct mdp5_cfg *config;
        struct mdp5_kms *mdp5_kms;
        struct msm_kms *kms = NULL;
        struct msm_mmu *mmu;
        uint32_t major, minor;
        int i, ret;

        mdp5_kms = kzalloc(sizeof(*mdp5_kms), GFP_KERNEL);
        if (!mdp5_kms) {
                dev_err(dev->dev, "failed to allocate kms\n");
                ret = -ENOMEM;
                goto fail;
        }

        spin_lock_init(&mdp5_kms->resource_lock);

        mdp_kms_init(&mdp5_kms->base, &kms_funcs);

        kms = &mdp5_kms->base.base;

        mdp5_kms->dev = dev;

        /* mdp5_kms->mmio actually represents the MDSS base address */
        mdp5_kms->mmio = msm_ioremap(pdev, "mdp_phys", "MDP5");
        if (IS_ERR(mdp5_kms->mmio)) {
                ret = PTR_ERR(mdp5_kms->mmio);
                goto fail;
        }

        mdp5_kms->vbif = msm_ioremap(pdev, "vbif_phys", "VBIF");
        if (IS_ERR(mdp5_kms->vbif)) {
                ret = PTR_ERR(mdp5_kms->vbif);
                goto fail;
        }

        mdp5_kms->vdd = devm_regulator_get(&pdev->dev, "vdd");
        if (IS_ERR(mdp5_kms->vdd)) {
                ret = PTR_ERR(mdp5_kms->vdd);
                goto fail;
        }

        ret = regulator_enable(mdp5_kms->vdd);
        if (ret) {
                dev_err(dev->dev, "failed to enable regulator vdd: %d\n", ret);
                goto fail;
        }

        /* mandatory clocks: */
        ret = get_clk(pdev, &mdp5_kms->axi_clk, "bus_clk", true);
        if (ret)
                goto fail;
        ret = get_clk(pdev, &mdp5_kms->ahb_clk, "iface_clk", true);
        if (ret)
                goto fail;
        ret = get_clk(pdev, &mdp5_kms->src_clk, "core_clk_src", true);
        if (ret)
                goto fail;
        ret = get_clk(pdev, &mdp5_kms->core_clk, "core_clk", true);
        if (ret)
                goto fail;
        ret = get_clk(pdev, &mdp5_kms->vsync_clk, "vsync_clk", true);
        if (ret)
                goto fail;

        /* optional clocks: */
        get_clk(pdev, &mdp5_kms->lut_clk, "lut_clk", false);

        /* we need to set a default rate before enabling.  Set a safe
         * rate first, then figure out hw revision, and then set a
         * more optimal rate:
         */
        clk_set_rate(mdp5_kms->src_clk, 200000000);

        read_hw_revision(mdp5_kms, &major, &minor);

        mdp5_kms->cfg = mdp5_cfg_init(mdp5_kms, major, minor);
        if (IS_ERR(mdp5_kms->cfg)) {
                ret = PTR_ERR(mdp5_kms->cfg);
                mdp5_kms->cfg = NULL;
                goto fail;
        }

        config = mdp5_cfg_get_config(mdp5_kms->cfg);
        mdp5_kms->caps = config->hw->mdp.caps;

        /* TODO: compute core clock rate at runtime */
        clk_set_rate(mdp5_kms->src_clk, config->hw->max_clk);

        /*
         * Some chipsets have a Shared Memory Pool (SMP), while others
         * have dedicated latency buffering per source pipe instead;
         * this section initializes the SMP:
         */
        if (mdp5_kms->caps & MDP_CAP_SMP) {
                mdp5_kms->smp = mdp5_smp_init(mdp5_kms->dev, &config->hw->smp);
                if (IS_ERR(mdp5_kms->smp)) {
                        ret = PTR_ERR(mdp5_kms->smp);
                        mdp5_kms->smp = NULL;
                        goto fail;
                }
        }

        mdp5_kms->ctlm = mdp5_ctlm_init(dev, mdp5_kms->mmio, mdp5_kms->cfg);
        if (IS_ERR(mdp5_kms->ctlm)) {
                ret = PTR_ERR(mdp5_kms->ctlm);
                mdp5_kms->ctlm = NULL;
                goto fail;
        }

        /* make sure things are off before attaching iommu (bootloader could
         * have left things on, in which case we'll start getting faults if
         * we don't disable):
         */
        mdp5_enable(mdp5_kms);
        for (i = 0; i < MDP5_INTF_NUM_MAX; i++) {
                if (mdp5_cfg_intf_is_virtual(config->hw->intf.connect[i]) ||
                                !config->hw->intf.base[i])
                        continue;
                mdp5_write(mdp5_kms, REG_MDP5_INTF_TIMING_ENGINE_EN(i), 0);

                mdp5_write(mdp5_kms, REG_MDP5_INTF_FRAME_LINE_COUNT_EN(i), 0x3);
        }
        mdp5_disable(mdp5_kms);
        mdelay(16);

        if (config->platform.iommu) {
                mmu = msm_iommu_new(&pdev->dev, config->platform.iommu);
                if (IS_ERR(mmu)) {
                        ret = PTR_ERR(mmu);
                        dev_err(dev->dev, "failed to init iommu: %d\n", ret);
                        iommu_domain_free(config->platform.iommu);
                        goto fail;
                }

                ret = mmu->funcs->attach(mmu, iommu_ports,
                                ARRAY_SIZE(iommu_ports));
                if (ret) {
                        dev_err(dev->dev, "failed to attach iommu: %d\n", ret);
                        mmu->funcs->destroy(mmu);
                        goto fail;
                }
        } else {
                dev_info(dev->dev, "no iommu, fallback to phys "
                                "contig buffers for scanout\n");
                mmu = NULL;
        }
        mdp5_kms->mmu = mmu;

        mdp5_kms->id = msm_register_mmu(dev, mmu);
        if (mdp5_kms->id < 0) {
                ret = mdp5_kms->id;
                dev_err(dev->dev, "failed to register mdp5 iommu: %d\n", ret);
                goto fail;
        }

        ret = modeset_init(mdp5_kms);
        if (ret) {
                dev_err(dev->dev, "modeset_init failed: %d\n", ret);
                goto fail;
        }

        dev->mode_config.min_width = 0;
        dev->mode_config.min_height = 0;
        dev->mode_config.max_width = config->hw->lm.max_width;
        dev->mode_config.max_height = config->hw->lm.max_height;

        dev->driver->get_vblank_timestamp = mdp5_get_vblank_timestamp;
        dev->driver->get_scanout_position = mdp5_get_scanoutpos;
        dev->driver->get_vblank_counter = mdp5_get_vblank_counter;
        dev->max_vblank_count = 0xffffffff;
        dev->vblank_disable_immediate = true;

        return kms;

fail:
        if (kms)
                mdp5_destroy(kms);
        return ERR_PTR(ret);
}