drivers/gpu/drm/sun4i/sun4i_crtc.c

   1 /*
   2  * Copyright (C) 2015 Free Electrons
   3  * Copyright (C) 2015 NextThing Co
   4  *
   5  * Maxime Ripard <maxime.ripard@free-electrons.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  */
  12
  13 #include <drm/drmP.h>
  14 #include <drm/drm_atomic_helper.h>
  15 #include <drm/drm_crtc.h>
  16 #include <drm/drm_crtc_helper.h>
  17 #include <drm/drm_modes.h>
  18
  19 #include <linux/clk-provider.h>
  20 #include <linux/ioport.h>
  21 #include <linux/of_address.h>
  22 #include <linux/of_graph.h>
  23 #include <linux/of_irq.h>
  24 #include <linux/regmap.h>
  25
  26 #include <video/videomode.h>
  27
  28 #include "sun4i_crtc.h"
  29 #include "sun4i_drv.h"
  30 #include "sunxi_engine.h"
  31 #include "sun4i_tcon.h"
  32
  33 static void sun4i_crtc_atomic_begin(struct drm_crtc *crtc,
  34                                     struct drm_crtc_state *old_state)
  35 {
  36         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  37         struct drm_device *dev = crtc->dev;
  38         unsigned long flags;
  39
  40         if (crtc->state->event) {
  41                 WARN_ON(drm_crtc_vblank_get(crtc) != 0);
  42
  43                 spin_lock_irqsave(&dev->event_lock, flags);
  44                 scrtc->event = crtc->state->event;
  45                 spin_unlock_irqrestore(&dev->event_lock, flags);
  46                 crtc->state->event = NULL;
  47          }
  48 }
  49
  50 static void sun4i_crtc_atomic_flush(struct drm_crtc *crtc,
  51                                     struct drm_crtc_state *old_state)
  52 {
  53         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  54         struct drm_pending_vblank_event *event = crtc->state->event;
  55
  56         DRM_DEBUG_DRIVER("Committing plane changes\n");
  57
  58         sunxi_engine_commit(scrtc->engine);
  59
  60         if (event) {
  61                 crtc->state->event = NULL;
  62
  63                 spin_lock_irq(&crtc->dev->event_lock);
  64                 if (drm_crtc_vblank_get(crtc) == 0)
  65                         drm_crtc_arm_vblank_event(crtc, event);
  66                 else
  67                         drm_crtc_send_vblank_event(crtc, event);
  68                 spin_unlock_irq(&crtc->dev->event_lock);
  69         }
  70 }
  71
  72 static void sun4i_crtc_disable(struct drm_crtc *crtc)
  73 {
  74         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  75
  76         DRM_DEBUG_DRIVER("Disabling the CRTC\n");
  77
  78         sun4i_tcon_disable(scrtc->tcon);
  79
  80         if (crtc->state->event && !crtc->state->active) {
  81                 spin_lock_irq(&crtc->dev->event_lock);
  82                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
  83                 spin_unlock_irq(&crtc->dev->event_lock);
  84
  85                 crtc->state->event = NULL;
  86         }
  87 }
  88
  89 static void sun4i_crtc_atomic_enable(struct drm_crtc *crtc,
  90                                      struct drm_crtc_state *old_state)
  91 {
  92         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  93
  94         DRM_DEBUG_DRIVER("Enabling the CRTC\n");
  95
  96         sun4i_tcon_enable(scrtc->tcon);
  97 }
  98
  99 static const struct drm_crtc_helper_funcs sun4i_crtc_helper_funcs = {
 100         .atomic_begin   = sun4i_crtc_atomic_begin,
 101         .atomic_flush   = sun4i_crtc_atomic_flush,
 102         .atomic_enable  = sun4i_crtc_atomic_enable,
 103         .disable        = sun4i_crtc_disable,
 104 };
 105
 106 static int sun4i_crtc_enable_vblank(struct drm_crtc *crtc)
 107 {
 108         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
 109
 110         DRM_DEBUG_DRIVER("Enabling VBLANK on crtc %p\n", crtc);
 111
 112         sun4i_tcon_enable_vblank(scrtc->tcon, true);
 113
 114         return 0;
 115 }
 116
 117 static void sun4i_crtc_disable_vblank(struct drm_crtc *crtc)
 118 {
 119         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
 120
 121         DRM_DEBUG_DRIVER("Disabling VBLANK on crtc %p\n", crtc);
 122
 123         sun4i_tcon_enable_vblank(scrtc->tcon, false);
 124 }
 125
 126 static const struct drm_crtc_funcs sun4i_crtc_funcs = {
 127         .atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
 128         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 129         .destroy                = drm_crtc_cleanup,
 130         .page_flip              = drm_atomic_helper_page_flip,
 131         .reset                  = drm_atomic_helper_crtc_reset,
 132         .set_config             = drm_atomic_helper_set_config,
 133         .enable_vblank          = sun4i_crtc_enable_vblank,
 134         .disable_vblank         = sun4i_crtc_disable_vblank,
 135 };
 136
 137 struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
 138                                    struct sunxi_engine *engine,
 139                                    struct sun4i_tcon *tcon)
 140 {
 141         struct sun4i_crtc *scrtc;
 142         struct drm_plane **planes;
 143         struct drm_plane *primary = NULL, *cursor = NULL;
 144         int ret, i;
 145
 146         scrtc = devm_kzalloc(drm->dev, sizeof(*scrtc), GFP_KERNEL);
 147         if (!scrtc)
 148                 return ERR_PTR(-ENOMEM);
 149         scrtc->engine = engine;
 150         scrtc->tcon = tcon;
 151
 152         /* Create our layers */
 153         planes = sunxi_engine_layers_init(drm, engine);
 154         if (IS_ERR(planes)) {
 155                 dev_err(drm->dev, "Couldn't create the planes\n");
 156                 return NULL;
 157         }
 158
 159         /* find primary and cursor planes for drm_crtc_init_with_planes */
 160         for (i = 0; planes[i]; i++) {
 161                 struct drm_plane *plane = planes[i];
 162
 163                 switch (plane->type) {
 164                 case DRM_PLANE_TYPE_PRIMARY:
 165                         primary = plane;
 166                         break;
 167                 case DRM_PLANE_TYPE_CURSOR:
 168                         cursor = plane;
 169                         break;
 170                 default:
 171                         break;
 172                 }
 173         }
 174
 175         ret = drm_crtc_init_with_planes(drm, &scrtc->crtc,
 176                                         primary,
 177                                         cursor,
 178                                         &sun4i_crtc_funcs,
 179                                         NULL);
 180         if (ret) {
 181                 dev_err(drm->dev, "Couldn't init DRM CRTC\n");
 182                 return ERR_PTR(ret);
 183         }
 184
 185         drm_crtc_helper_add(&scrtc->crtc, &sun4i_crtc_helper_funcs);
 186
 187         /* Set crtc.port to output port node of the tcon */
 188         scrtc->crtc.port = of_graph_get_port_by_id(scrtc->tcon->dev->of_node,
 189                                                    1);
 190
 191         /* Set possible_crtcs to this crtc for overlay planes */
 192         for (i = 0; planes[i]; i++) {
 193                 uint32_t possible_crtcs = BIT(drm_crtc_index(&scrtc->crtc));
 194                 struct drm_plane *plane = planes[i];
 195
 196                 if (plane->type == DRM_PLANE_TYPE_OVERLAY)
 197                         plane->possible_crtcs = possible_crtcs;
 198         }
 199
 200         return scrtc;
 201 }