Quelle  exynos_drm_plane.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2011 Samsung Electronics Co.Ltd
 * Authors: Joonyoung Shim <jy0922.shim@samsung.com>
 */


#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_blend.h>
#include <drm/drm_framebuffer.h>
#include <drm/exynos_drm.h>

#include "exynos_drm_crtc.h"
#include "exynos_drm_drv.h"
#include "exynos_drm_fb.h"
#include "exynos_drm_gem.h"
#include "exynos_drm_plane.h"

/*
 * 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 f.
 *
 *             <----- 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;
}

static void exynos_plane_mode_set(struct exynos_drm_plane_state *exynos_state)
{
 struct drm_plane_state *state = &exynos_state->base;
 struct drm_crtc *crtc = state->crtc;
 struct drm_crtc_state *crtc_state =
   drm_atomic_get_existing_crtc_state(state->state, crtc);
 struct drm_display_mode *mode = &crtc_state->adjusted_mode;
 int crtc_x, crtc_y;
 unsigned int crtc_w, crtc_h;
 unsigned int src_x, src_y;
 unsigned int src_w, src_h;
 unsigned int actual_w;
 unsigned int actual_h;

 /*
 * The original src/dest coordinates are stored in exynos_state->base,
 * but we want to keep another copy internal to our driver that we can
 * clip/modify ourselves.
 */

 crtc_x = state->crtc_x;
 crtc_y = state->crtc_y;
 crtc_w = state->crtc_w;
 crtc_h = state->crtc_h;

 src_x = state->src_x >> 16;
 src_y = state->src_y >> 16;
 src_w = state->src_w >> 16;
 src_h = state->src_h >> 16;

 /* set ratio */
 exynos_state->h_ratio = (src_w << 16) / crtc_w;
 exynos_state->v_ratio = (src_h << 16) / crtc_h;

 /* clip to visible area */
 actual_w = exynos_plane_get_size(crtc_x, crtc_w, mode->hdisplay);
 actual_h = exynos_plane_get_size(crtc_y, crtc_h, mode->vdisplay);

 if (crtc_x < 0) {
  if (actual_w)
   src_x += ((-crtc_x) * exynos_state->h_ratio) >> 16;
  crtc_x = 0;
 }

 if (crtc_y < 0) {
  if (actual_h)
   src_y += ((-crtc_y) * exynos_state->v_ratio) >> 16;
  crtc_y = 0;
 }

 /* set drm framebuffer data. */
 exynos_state->src.x = src_x;
 exynos_state->src.y = src_y;
 exynos_state->src.w = (actual_w * exynos_state->h_ratio) >> 16;
 exynos_state->src.h = (actual_h * exynos_state->v_ratio) >> 16;

 /* set plane range to be displayed. */
 exynos_state->crtc.x = crtc_x;
 exynos_state->crtc.y = crtc_y;
 exynos_state->crtc.w = actual_w;
 exynos_state->crtc.h = actual_h;

 DRM_DEV_DEBUG_KMS(crtc->dev->dev,
     "plane : offset_x/y(%d,%d), width/height(%d,%d)",
     exynos_state->crtc.x, exynos_state->crtc.y,
     exynos_state->crtc.w, exynos_state->crtc.h);
}

static void exynos_drm_plane_reset(struct drm_plane *plane)
{
 struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 struct exynos_drm_plane_state *exynos_state;

 if (plane->state) {
  exynos_state = to_exynos_plane_state(plane->state);
  __drm_atomic_helper_plane_destroy_state(plane->state);
  kfree(exynos_state);
  plane->state = NULL;
 }

 exynos_state = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
 if (exynos_state) {
  __drm_atomic_helper_plane_reset(plane, &exynos_state->base);
  plane->state->zpos = exynos_plane->config->zpos;
 }
}

static struct drm_plane_state *
exynos_drm_plane_duplicate_state(struct drm_plane *plane)
{
 struct exynos_drm_plane_state *exynos_state;
 struct exynos_drm_plane_state *copy;

 exynos_state = to_exynos_plane_state(plane->state);
 copy = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
 if (!copy)
  return NULL;

 __drm_atomic_helper_plane_duplicate_state(plane, ©->base);
 return ©->base;
}

static void exynos_drm_plane_destroy_state(struct drm_plane *plane,
        struct drm_plane_state *old_state)
{
 struct exynos_drm_plane_state *old_exynos_state =
     to_exynos_plane_state(old_state);
 __drm_atomic_helper_plane_destroy_state(old_state);
 kfree(old_exynos_state);
}

static struct drm_plane_funcs exynos_plane_funcs = {
 .update_plane = drm_atomic_helper_update_plane,
 .disable_plane = drm_atomic_helper_disable_plane,
 .destroy = drm_plane_cleanup,
 .reset  = exynos_drm_plane_reset,
 .atomic_duplicate_state = exynos_drm_plane_duplicate_state,
 .atomic_destroy_state = exynos_drm_plane_destroy_state,
};

static int
exynos_drm_plane_check_format(const struct exynos_drm_plane_config *config,
         struct exynos_drm_plane_state *state)
{
 struct drm_framebuffer *fb = state->base.fb;
 struct drm_device *dev = fb->dev;

 switch (fb->modifier) {
 case DRM_FORMAT_MOD_SAMSUNG_64_32_TILE:
  if (!(config->capabilities & EXYNOS_DRM_PLANE_CAP_TILE))
   return -ENOTSUPP;
  break;

 case DRM_FORMAT_MOD_LINEAR:
  break;

 default:
  DRM_DEV_ERROR(dev->dev, "unsupported pixel format modifier");
  return -ENOTSUPP;
 }

 return 0;
}

static int
exynos_drm_plane_check_size(const struct exynos_drm_plane_config *config,
       struct exynos_drm_plane_state *state)
{
 struct drm_crtc *crtc = state->base.crtc;
 bool width_ok = false, height_ok = false;

 if (config->capabilities & EXYNOS_DRM_PLANE_CAP_SCALE)
  return 0;

 if (state->src.w == state->crtc.w)
  width_ok = true;

 if (state->src.h == state->crtc.h)
  height_ok = true;

 if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
     state->h_ratio == (1 << 15))
  width_ok = true;

 if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
     state->v_ratio == (1 << 15))
  height_ok = true;

 if (width_ok && height_ok)
  return 0;

 DRM_DEV_DEBUG_KMS(crtc->dev->dev, "scaling mode is not supported");
 return -ENOTSUPP;
}

static int exynos_plane_atomic_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 exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 struct exynos_drm_plane_state *exynos_state =
      to_exynos_plane_state(new_plane_state);
 int ret = 0;

 if (!new_plane_state->crtc || !new_plane_state->fb)
  return 0;

 /* translate state into exynos_state */
 exynos_plane_mode_set(exynos_state);

 ret = exynos_drm_plane_check_format(exynos_plane->config, exynos_state);
 if (ret)
  return ret;

 ret = exynos_drm_plane_check_size(exynos_plane->config, exynos_state);
 return ret;
}

static void exynos_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);
 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(new_state->crtc);
 struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);

 if (!new_state->crtc)
  return;

 if (exynos_crtc->ops->update_plane)
  exynos_crtc->ops->update_plane(exynos_crtc, exynos_plane);
}

static void exynos_plane_atomic_disable(struct drm_plane *plane,
     struct drm_atomic_state *state)
{
 struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state, plane);
 struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(old_state->crtc);

 if (!old_state->crtc)
  return;

 if (exynos_crtc->ops->disable_plane)
  exynos_crtc->ops->disable_plane(exynos_crtc, exynos_plane);
}

static const struct drm_plane_helper_funcs plane_helper_funcs = {
 .atomic_check = exynos_plane_atomic_check,
 .atomic_update = exynos_plane_atomic_update,
 .atomic_disable = exynos_plane_atomic_disable,
};

static void exynos_plane_attach_zpos_property(struct drm_plane *plane,
           int zpos, bool immutable)
{
 if (immutable)
  drm_plane_create_zpos_immutable_property(plane, zpos);
 else
  drm_plane_create_zpos_property(plane, zpos, 0, MAX_PLANE - 1);
}

int exynos_plane_init(struct drm_device *dev,
        struct exynos_drm_plane *exynos_plane, unsigned int index,
        const struct exynos_drm_plane_config *config)
{
 int err;
 unsigned int supported_modes = BIT(DRM_MODE_BLEND_PIXEL_NONE) |
           BIT(DRM_MODE_BLEND_PREMULTI) |
           BIT(DRM_MODE_BLEND_COVERAGE);
 struct drm_plane *plane = &exynos_plane->base;

 err = drm_universal_plane_init(dev, &exynos_plane->base,
           1 << dev->mode_config.num_crtc,
           &exynos_plane_funcs,
           config->pixel_formats,
           config->num_pixel_formats,
           NULL, config->type, NULL);
 if (err) {
  DRM_DEV_ERROR(dev->dev, "failed to initialize plane\n");
  return err;
 }

 drm_plane_helper_add(&exynos_plane->base, &plane_helper_funcs);

 exynos_plane->index = index;
 exynos_plane->config = config;

 exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos,
      !(config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS));

 if (config->capabilities & EXYNOS_DRM_PLANE_CAP_PIX_BLEND)
  drm_plane_create_blend_mode_property(plane, supported_modes);

 if (config->capabilities & EXYNOS_DRM_PLANE_CAP_WIN_BLEND)
  drm_plane_create_alpha_property(plane);

 return 0;
}