drivers/staging/omapdrm/omap_crtc.c

   1 /*
   2  * drivers/staging/omapdrm/omap_crtc.c
   3  *
   4  * Copyright (C) 2011 Texas Instruments
   5  * Author: Rob Clark <rob@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "omap_drv.h"
  21
  22 #include "drm_mode.h"
  23 #include "drm_crtc.h"
  24 #include "drm_crtc_helper.h"
  25
  26 #define to_omap_crtc(x) container_of(x, struct omap_crtc, base)
  27
  28 struct omap_crtc {
  29         struct drm_crtc base;
  30         struct drm_plane *plane;
  31         const char *name;
  32         int id;
  33
  34         /* if there is a pending flip, these will be non-null: */
  35         struct drm_pending_vblank_event *event;
  36         struct drm_framebuffer *old_fb;
  37 };
  38
  39 static void omap_crtc_gamma_set(struct drm_crtc *crtc,
  40                 u16 *red, u16 *green, u16 *blue, uint32_t start, uint32_t size)
  41 {
  42         /* not supported.. at least not yet */
  43 }
  44
  45 static void omap_crtc_destroy(struct drm_crtc *crtc)
  46 {
  47         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  48         omap_crtc->plane->funcs->destroy(omap_crtc->plane);
  49         drm_crtc_cleanup(crtc);
  50         kfree(omap_crtc);
  51 }
  52
  53 static void omap_crtc_dpms(struct drm_crtc *crtc, int mode)
  54 {
  55         struct omap_drm_private *priv = crtc->dev->dev_private;
  56         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  57         int i;
  58
  59         WARN_ON(omap_plane_dpms(omap_crtc->plane, mode));
  60
  61         for (i = 0; i < priv->num_planes; i++) {
  62                 struct drm_plane *plane = priv->planes[i];
  63                 if (plane->crtc == crtc)
  64                         WARN_ON(omap_plane_dpms(plane, mode));
  65         }
  66 }
  67
  68 static bool omap_crtc_mode_fixup(struct drm_crtc *crtc,
  69                 struct drm_display_mode *mode,
  70                 struct drm_display_mode *adjusted_mode)
  71 {
  72         return true;
  73 }
  74
  75 static int omap_crtc_mode_set(struct drm_crtc *crtc,
  76                 struct drm_display_mode *mode,
  77                 struct drm_display_mode *adjusted_mode,
  78                 int x, int y,
  79                 struct drm_framebuffer *old_fb)
  80 {
  81         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  82         struct drm_plane *plane = omap_crtc->plane;
  83
  84         return omap_plane_mode_set(plane, crtc, crtc->fb,
  85                         0, 0, mode->hdisplay, mode->vdisplay,
  86                         x << 16, y << 16,
  87                         mode->hdisplay << 16, mode->vdisplay << 16);
  88 }
  89
  90 static void omap_crtc_prepare(struct drm_crtc *crtc)
  91 {
  92         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  93         DBG("%s", omap_crtc->name);
  94         omap_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
  95 }
  96
  97 static void omap_crtc_commit(struct drm_crtc *crtc)
  98 {
  99         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 100         DBG("%s", omap_crtc->name);
 101         omap_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
 102 }
 103
 104 static int omap_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 105                 struct drm_framebuffer *old_fb)
 106 {
 107         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 108         struct drm_plane *plane = omap_crtc->plane;
 109         struct drm_display_mode *mode = &crtc->mode;
 110
 111         return plane->funcs->update_plane(plane, crtc, crtc->fb,
 112                         0, 0, mode->hdisplay, mode->vdisplay,
 113                         x << 16, y << 16,
 114                         mode->hdisplay << 16, mode->vdisplay << 16);
 115 }
 116
 117 static void omap_crtc_load_lut(struct drm_crtc *crtc)
 118 {
 119 }
 120
 121 static void vblank_cb(void *arg)
 122 {
 123         static uint32_t sequence = 0;
 124         struct drm_crtc *crtc = arg;
 125         struct drm_device *dev = crtc->dev;
 126         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 127         struct drm_pending_vblank_event *event = omap_crtc->event;
 128         unsigned long flags;
 129         struct timeval now;
 130
 131         WARN_ON(!event);
 132
 133         omap_crtc->event = NULL;
 134
 135         /* wakeup userspace */
 136         if (event) {
 137                 do_gettimeofday(&now);
 138
 139                 spin_lock_irqsave(&dev->event_lock, flags);
 140                 /* TODO: we can't yet use the vblank time accounting,
 141                  * because omapdss lower layer is the one that knows
 142                  * the irq # and registers the handler, which more or
 143                  * less defeats how drm_irq works.. for now just fake
 144                  * the sequence number and use gettimeofday..
 145                  *
 146                 event->event.sequence = drm_vblank_count_and_time(
 147                                 dev, omap_crtc->id, &now);
 148                  */
 149                 event->event.sequence = sequence++;
 150                 event->event.tv_sec = now.tv_sec;
 151                 event->event.tv_usec = now.tv_usec;
 152                 list_add_tail(&event->base.link,
 153                                 &event->base.file_priv->event_list);
 154                 wake_up_interruptible(&event->base.file_priv->event_wait);
 155                 spin_unlock_irqrestore(&dev->event_lock, flags);
 156         }
 157 }
 158
 159 static void page_flip_cb(void *arg)
 160 {
 161         struct drm_crtc *crtc = arg;
 162         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 163         struct drm_framebuffer *old_fb = omap_crtc->old_fb;
 164
 165         omap_crtc->old_fb = NULL;
 166
 167         omap_crtc_mode_set_base(crtc, crtc->x, crtc->y, old_fb);
 168
 169         /* really we'd like to setup the callback atomically w/ setting the
 170          * new scanout buffer to avoid getting stuck waiting an extra vblank
 171          * cycle.. for now go for correctness and later figure out speed..
 172          */
 173         omap_plane_on_endwin(omap_crtc->plane, vblank_cb, crtc);
 174 }
 175
 176 static int omap_crtc_page_flip_locked(struct drm_crtc *crtc,
 177                  struct drm_framebuffer *fb,
 178                  struct drm_pending_vblank_event *event)
 179 {
 180         struct drm_device *dev = crtc->dev;
 181         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 182
 183         DBG("%d -> %d", crtc->fb ? crtc->fb->base.id : -1, fb->base.id);
 184
 185         if (omap_crtc->event) {
 186                 dev_err(dev->dev, "already a pending flip\n");
 187                 return -EINVAL;
 188         }
 189
 190         omap_crtc->old_fb = crtc->fb;
 191         omap_crtc->event = event;
 192         crtc->fb = fb;
 193
 194         omap_gem_op_async(omap_framebuffer_bo(fb, 0), OMAP_GEM_READ,
 195                         page_flip_cb, crtc);
 196
 197         return 0;
 198 }
 199
 200 static const struct drm_crtc_funcs omap_crtc_funcs = {
 201         .gamma_set = omap_crtc_gamma_set,
 202         .set_config = drm_crtc_helper_set_config,
 203         .destroy = omap_crtc_destroy,
 204         .page_flip = omap_crtc_page_flip_locked,
 205 };
 206
 207 static const struct drm_crtc_helper_funcs omap_crtc_helper_funcs = {
 208         .dpms = omap_crtc_dpms,
 209         .mode_fixup = omap_crtc_mode_fixup,
 210         .mode_set = omap_crtc_mode_set,
 211         .prepare = omap_crtc_prepare,
 212         .commit = omap_crtc_commit,
 213         .mode_set_base = omap_crtc_mode_set_base,
 214         .load_lut = omap_crtc_load_lut,
 215 };
 216
 217 /* initialize crtc */
 218 struct drm_crtc *omap_crtc_init(struct drm_device *dev,
 219                 struct omap_overlay *ovl, int id)
 220 {
 221         struct drm_crtc *crtc = NULL;
 222         struct omap_crtc *omap_crtc = kzalloc(sizeof(*omap_crtc), GFP_KERNEL);
 223
 224         DBG("%s", ovl->name);
 225
 226         if (!omap_crtc) {
 227                 dev_err(dev->dev, "could not allocate CRTC\n");
 228                 goto fail;
 229         }
 230
 231         crtc = &omap_crtc->base;
 232
 233         omap_crtc->plane = omap_plane_init(dev, ovl, (1 << id), true);
 234         omap_crtc->plane->crtc = crtc;
 235         omap_crtc->name = ovl->name;
 236         omap_crtc->id = id;
 237
 238         drm_crtc_init(dev, crtc, &omap_crtc_funcs);
 239         drm_crtc_helper_add(crtc, &omap_crtc_helper_funcs);
 240
 241         return crtc;
 242
 243 fail:
 244         if (crtc) {
 245                 omap_crtc_destroy(crtc);
 246         }
 247         return NULL;
 248 }