drivers/gpu/drm/exynos/exynos_drm_plane.c

   1 /*
   2  * Copyright (C) 2011 Samsung Electronics Co.Ltd
   3  * Authors: Joonyoung Shim <jy0922.shim@samsung.com>
   4  *
   5  * This program is free software; you can redistribute  it and/or modify it
   6  * under  the terms of  the GNU General  Public License as published by the
   7  * Free Software Foundation;  either version 2 of the  License, or (at your
   8  * option) any later version.
   9  *
  10  */
  11
  12 #include <drm/drmP.h>
  13
  14 #include <drm/exynos_drm.h>
  15 #include <drm/drm_plane_helper.h>
  16 #include <drm/drm_atomic_helper.h>
  17 #include "exynos_drm_drv.h"
  18 #include "exynos_drm_crtc.h"
  19 #include "exynos_drm_fb.h"
  20 #include "exynos_drm_gem.h"
  21 #include "exynos_drm_plane.h"
  22
  23 /*
  24  * This function is to get X or Y size shown via screen. This needs length and
  25  * start position of CRTC.
  26  *
  27  *      <--- length --->
  28  * CRTC ----------------
  29  *      ^ start        ^ end
  30  *
  31  * There are six cases from a to f.
  32  *
  33  *             <----- SCREEN ----->
  34  *             0                 last
  35  *   ----------|------------------|----------
  36  * CRTCs
  37  * a -------
  38  *        b -------
  39  *        c --------------------------
  40  *                 d --------
  41  *                           e -------
  42  *                                  f -------
  43  */
  44 static int exynos_plane_get_size(int start, unsigned length, unsigned last)
  45 {
  46         int end = start + length;
  47         int size = 0;
  48
  49         if (start <= 0) {
  50                 if (end > 0)
  51                         size = min_t(unsigned, end, last);
  52         } else if (start <= last) {
  53                 size = min_t(unsigned, last - start, length);
  54         }
  55
  56         return size;
  57 }
  58
  59 static void exynos_plane_mode_set(struct drm_plane *plane,
  60                                   struct drm_crtc *crtc,
  61                                   struct drm_framebuffer *fb,
  62                                   int crtc_x, int crtc_y,
  63                                   unsigned int crtc_w, unsigned int crtc_h,
  64                                   uint32_t src_x, uint32_t src_y,
  65                                   uint32_t src_w, uint32_t src_h)
  66 {
  67         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
  68         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
  69         unsigned int actual_w;
  70         unsigned int actual_h;
  71
  72         actual_w = exynos_plane_get_size(crtc_x, crtc_w, mode->hdisplay);
  73         actual_h = exynos_plane_get_size(crtc_y, crtc_h, mode->vdisplay);
  74
  75         if (crtc_x < 0) {
  76                 if (actual_w)
  77                         src_x -= crtc_x;
  78                 crtc_x = 0;
  79         }
  80
  81         if (crtc_y < 0) {
  82                 if (actual_h)
  83                         src_y -= crtc_y;
  84                 crtc_y = 0;
  85         }
  86
  87         /* set ratio */
  88         exynos_plane->h_ratio = (src_w << 16) / crtc_w;
  89         exynos_plane->v_ratio = (src_h << 16) / crtc_h;
  90
  91         /* set drm framebuffer data. */
  92         exynos_plane->src_x = src_x;
  93         exynos_plane->src_y = src_y;
  94         exynos_plane->src_w = (actual_w * exynos_plane->h_ratio) >> 16;
  95         exynos_plane->src_h = (actual_h * exynos_plane->v_ratio) >> 16;
  96
  97         /* set plane range to be displayed. */
  98         exynos_plane->crtc_x = crtc_x;
  99         exynos_plane->crtc_y = crtc_y;
 100         exynos_plane->crtc_w = actual_w;
 101         exynos_plane->crtc_h = actual_h;
 102
 103         DRM_DEBUG_KMS("plane : offset_x/y(%d,%d), width/height(%d,%d)",
 104                         exynos_plane->crtc_x, exynos_plane->crtc_y,
 105                         exynos_plane->crtc_w, exynos_plane->crtc_h);
 106
 107         plane->crtc = crtc;
 108 }
 109
 110 static struct drm_plane_funcs exynos_plane_funcs = {
 111         .update_plane   = drm_atomic_helper_update_plane,
 112         .disable_plane  = drm_atomic_helper_disable_plane,
 113         .destroy        = drm_plane_cleanup,
 114         .reset = drm_atomic_helper_plane_reset,
 115         .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
 116         .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
 117 };
 118
 119 static int exynos_plane_atomic_check(struct drm_plane *plane,
 120                                      struct drm_plane_state *state)
 121 {
 122         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 123         int nr;
 124         int i;
 125
 126         if (!state->fb)
 127                 return 0;
 128
 129         nr = drm_format_num_planes(state->fb->pixel_format);
 130         for (i = 0; i < nr; i++) {
 131                 struct exynos_drm_gem_obj *obj =
 132                                         exynos_drm_fb_gem_obj(state->fb, i);
 133
 134                 if (!obj) {
 135                         DRM_DEBUG_KMS("gem object is null\n");
 136                         return -EFAULT;
 137                 }
 138
 139                 exynos_plane->dma_addr[i] = obj->dma_addr +
 140                                             state->fb->offsets[i];
 141
 142                 DRM_DEBUG_KMS("buffer: %d, dma_addr = 0x%lx\n",
 143                                 i, (unsigned long)exynos_plane->dma_addr[i]);
 144         }
 145
 146         return 0;
 147 }
 148
 149 static void exynos_plane_atomic_update(struct drm_plane *plane,
 150                                        struct drm_plane_state *old_state)
 151 {
 152         struct drm_plane_state *state = plane->state;
 153         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(state->crtc);
 154         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 155
 156         if (!state->crtc)
 157                 return;
 158
 159         exynos_plane_mode_set(plane, state->crtc, state->fb,
 160                               state->crtc_x, state->crtc_y,
 161                               state->crtc_w, state->crtc_h,
 162                               state->src_x >> 16, state->src_y >> 16,
 163                               state->src_w >> 16, state->src_h >> 16);
 164
 165         exynos_plane->pending_fb = state->fb;
 166
 167         if (exynos_crtc->ops->update_plane)
 168                 exynos_crtc->ops->update_plane(exynos_crtc, exynos_plane);
 169 }
 170
 171 static void exynos_plane_atomic_disable(struct drm_plane *plane,
 172                                         struct drm_plane_state *old_state)
 173 {
 174         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 175         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(old_state->crtc);
 176
 177         if (!old_state->crtc)
 178                 return;
 179
 180         if (exynos_crtc->ops->disable_plane)
 181                 exynos_crtc->ops->disable_plane(exynos_crtc,
 182                                                 exynos_plane);
 183 }
 184
 185 static const struct drm_plane_helper_funcs plane_helper_funcs = {
 186         .atomic_check = exynos_plane_atomic_check,
 187         .atomic_update = exynos_plane_atomic_update,
 188         .atomic_disable = exynos_plane_atomic_disable,
 189 };
 190
 191 static void exynos_plane_attach_zpos_property(struct drm_plane *plane,
 192                                               unsigned int zpos)
 193 {
 194         struct drm_device *dev = plane->dev;
 195         struct exynos_drm_private *dev_priv = dev->dev_private;
 196         struct drm_property *prop;
 197
 198         prop = dev_priv->plane_zpos_property;
 199         if (!prop) {
 200                 prop = drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE,
 201                                                  "zpos", 0, MAX_PLANE - 1);
 202                 if (!prop)
 203                         return;
 204
 205                 dev_priv->plane_zpos_property = prop;
 206         }
 207
 208         drm_object_attach_property(&plane->base, prop, zpos);
 209 }
 210
 211 int exynos_plane_init(struct drm_device *dev,
 212                       struct exynos_drm_plane *exynos_plane,
 213                       unsigned long possible_crtcs, enum drm_plane_type type,
 214                       const uint32_t *formats, unsigned int fcount,
 215                       unsigned int zpos)
 216 {
 217         int err;
 218
 219         err = drm_universal_plane_init(dev, &exynos_plane->base, possible_crtcs,
 220                                        &exynos_plane_funcs, formats, fcount,
 221                                        type);
 222         if (err) {
 223                 DRM_ERROR("failed to initialize plane\n");
 224                 return err;
 225         }
 226
 227         drm_plane_helper_add(&exynos_plane->base, &plane_helper_funcs);
 228
 229         exynos_plane->zpos = zpos;
 230
 231         if (type == DRM_PLANE_TYPE_OVERLAY)
 232                 exynos_plane_attach_zpos_property(&exynos_plane->base, zpos);
 233
 234         return 0;
 235 }