exynos_drm_plane.c

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/*
 * Copyright (C) 2011 Samsung Electronics Co.Ltd
 * Authors: Joonyoung Shim <[email protected]>
 *
 * 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/exynos_drm.h>
#include "exynos_drm_drv.h"
#include "exynos_drm_encoder.h"
#include "exynos_drm_fb.h"
#include "exynos_drm_gem.h"

#define to_exynos_plane(x)  container_of(x, struct exynos_plane, base)

struct exynos_plane {
    struct drm_plane        base;
    struct exynos_drm_overlay   overlay;
    bool                enabled;
};

static const uint32_t formats[] = {
    DRM_FORMAT_XRGB8888,
    DRM_FORMAT_ARGB8888,
    DRM_FORMAT_NV12,
    DRM_FORMAT_NV12MT,
};

/*
 * This function is to get X or Y size shown via screen. This needs length and
 * start position of CRTC.
 *
 *      <--- length --->
 * CRTC ----------------
 *      ^ start        ^ end
 *
 * There are six cases from a to b.
 *
 *             <----- SCREEN ----->
 *             0                 last
 *   ----------|------------------|----------
 * CRTCs
 * a -------
 *        b -------
 *        c --------------------------
 *                 d --------
 *                           e -------
 *                                  f -------
 */
static int exynos_plane_get_size(int start, unsigned length, unsigned last)
{
    int end = start + length;
    int size = 0;

    if (start <= 0) {
        if (end > 0)
            size = min_t(unsigned, end, last);
    } else if (start <= last) {
        size = min_t(unsigned, last - start, length);
    }

    return size;
}

int exynos_plane_mode_set(struct drm_plane *plane, struct drm_crtc *crtc,
              struct drm_framebuffer *fb, int crtc_x, int crtc_y,
              unsigned int crtc_w, unsigned int crtc_h,
              uint32_t src_x, uint32_t src_y,
              uint32_t src_w, uint32_t src_h)
{
    struct exynos_plane *exynos_plane = to_exynos_plane(plane);
    struct exynos_drm_overlay *overlay = &exynos_plane->overlay;
    unsigned int actual_w;
    unsigned int actual_h;
    int nr;
    int i;

    DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);

    nr = exynos_drm_fb_get_buf_cnt(fb);
    for (i = 0; i < nr; i++) {
        struct exynos_drm_gem_buf *buffer = exynos_drm_fb_buffer(fb, i);

        if (!buffer) {
            DRM_LOG_KMS("buffer is null\n");
            return -EFAULT;
        }

        overlay->dma_addr[i] = buffer->dma_addr;
        overlay->vaddr[i] = buffer->kvaddr;

        DRM_DEBUG_KMS("buffer: %d, vaddr = 0x%lx, dma_addr = 0x%lx\n",
                i, (unsigned long)overlay->vaddr[i],
                (unsigned long)overlay->dma_addr[i]);
    }

    actual_w = exynos_plane_get_size(crtc_x, crtc_w, crtc->mode.hdisplay);
    actual_h = exynos_plane_get_size(crtc_y, crtc_h, crtc->mode.vdisplay);

    if (crtc_x < 0) {
        if (actual_w)
            src_x -= crtc_x;
        else
            src_x += crtc_w;
        crtc_x = 0;
    }

    if (crtc_y < 0) {
        if (actual_h)
            src_y -= crtc_y;
        else
            src_y += crtc_h;
        crtc_y = 0;
    }

    /* set drm framebuffer data. */
    overlay->fb_x = src_x;
    overlay->fb_y = src_y;
    overlay->fb_width = fb->width;
    overlay->fb_height = fb->height;
    overlay->src_width = src_w;
    overlay->src_height = src_h;
    overlay->bpp = fb->bits_per_pixel;
    overlay->pitch = fb->pitches[0];
    overlay->pixel_format = fb->pixel_format;

    /* set overlay range to be displayed. */
    overlay->crtc_x = crtc_x;
    overlay->crtc_y = crtc_y;
    overlay->crtc_width = actual_w;
    overlay->crtc_height = actual_h;

    /* set drm mode data. */
    overlay->mode_width = crtc->mode.hdisplay;
    overlay->mode_height = crtc->mode.vdisplay;
    overlay->refresh = crtc->mode.vrefresh;
    overlay->scan_flag = crtc->mode.flags;

    DRM_DEBUG_KMS("overlay : offset_x/y(%d,%d), width/height(%d,%d)",
            overlay->crtc_x, overlay->crtc_y,
            overlay->crtc_width, overlay->crtc_height);

    exynos_drm_fn_encoder(crtc, overlay, exynos_drm_encoder_plane_mode_set);

    return 0;
}

void exynos_plane_commit(struct drm_plane *plane)
{
    struct exynos_plane *exynos_plane = to_exynos_plane(plane);
    struct exynos_drm_overlay *overlay = &exynos_plane->overlay;

    exynos_drm_fn_encoder(plane->crtc, &overlay->zpos,
            exynos_drm_encoder_plane_commit);
}

void exynos_plane_dpms(struct drm_plane *plane, int mode)
{
    struct exynos_plane *exynos_plane = to_exynos_plane(plane);
    struct exynos_drm_overlay *overlay = &exynos_plane->overlay;

    DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);

    if (mode == DRM_MODE_DPMS_ON) {
        if (exynos_plane->enabled)
            return;

        exynos_drm_fn_encoder(plane->crtc, &overlay->zpos,
                exynos_drm_encoder_plane_enable);

        exynos_plane->enabled = true;
    } else {
        if (!exynos_plane->enabled)
            return;

        exynos_drm_fn_encoder(plane->crtc, &overlay->zpos,
                exynos_drm_encoder_plane_disable);

        exynos_plane->enabled = false;
    }
}

static int
exynos_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
             struct drm_framebuffer *fb, int crtc_x, int crtc_y,
             unsigned int crtc_w, unsigned int crtc_h,
             uint32_t src_x, uint32_t src_y,
             uint32_t src_w, uint32_t src_h)
{
    int ret;

    DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);

    ret = exynos_plane_mode_set(plane, crtc, fb, crtc_x, crtc_y,
            crtc_w, crtc_h, src_x >> 16, src_y >> 16,
            src_w >> 16, src_h >> 16);
    if (ret < 0)
        return ret;

    plane->crtc = crtc;

    exynos_plane_commit(plane);
    exynos_plane_dpms(plane, DRM_MODE_DPMS_ON);

    return 0;
}

static int exynos_disable_plane(struct drm_plane *plane)
{
    DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);

    exynos_plane_dpms(plane, DRM_MODE_DPMS_OFF);

    return 0;
}

static void exynos_plane_destroy(struct drm_plane *plane)
{
    struct exynos_plane *exynos_plane = to_exynos_plane(plane);

    DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);

    exynos_disable_plane(plane);
    drm_plane_cleanup(plane);
    kfree(exynos_plane);
}

static int exynos_plane_set_property(struct drm_plane *plane,
                     struct drm_property *property,
                     uint64_t val)
{
    struct drm_device *dev = plane->dev;
    struct exynos_plane *exynos_plane = to_exynos_plane(plane);
    struct exynos_drm_private *dev_priv = dev->dev_private;

    DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);

    if (property == dev_priv->plane_zpos_property) {
        exynos_plane->overlay.zpos = val;
        return 0;
    }

    return -EINVAL;
}

static struct drm_plane_funcs exynos_plane_funcs = {
    .update_plane   = exynos_update_plane,
    .disable_plane  = exynos_disable_plane,
    .destroy    = exynos_plane_destroy,
    .set_property   = exynos_plane_set_property,
};

static void exynos_plane_attach_zpos_property(struct drm_plane *plane)
{
    struct drm_device *dev = plane->dev;
    struct exynos_drm_private *dev_priv = dev->dev_private;
    struct drm_property *prop;

    DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);

    prop = dev_priv->plane_zpos_property;
    if (!prop) {
        prop = drm_property_create_range(dev, 0, "zpos", 0,
                         MAX_PLANE - 1);
        if (!prop)
            return;

        dev_priv->plane_zpos_property = prop;
    }

    drm_object_attach_property(&plane->base, prop, 0);
}

struct drm_plane *exynos_plane_init(struct drm_device *dev,
                    unsigned int possible_crtcs, bool priv)
{
    struct exynos_plane *exynos_plane;
    int err;

    DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);

    exynos_plane = kzalloc(sizeof(struct exynos_plane), GFP_KERNEL);
    if (!exynos_plane) {
        DRM_ERROR("failed to allocate plane\n");
        return NULL;
    }

    err = drm_plane_init(dev, &exynos_plane->base, possible_crtcs,
                  &exynos_plane_funcs, formats, ARRAY_SIZE(formats),
                  priv);
    if (err) {
        DRM_ERROR("failed to initialize plane\n");
        kfree(exynos_plane);
        return NULL;
    }

    if (priv)
        exynos_plane->overlay.zpos = DEFAULT_ZPOS;
    else
        exynos_plane_attach_zpos_property(&exynos_plane->base);

    return &exynos_plane->base;
}