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_backend.h"
  29 #include "sun4i_crtc.h"
  30 #include "sun4i_drv.h"
  31 #include "sunxi_engine.h"
  32 #include "sun4i_tcon.h"
  33
  34 /*
  35  * While this isn't really working in the DRM theory, in practice we
  36  * can only ever have one encoder per TCON since we have a mux in our
  37  * TCON.
  38  */
  39 static struct drm_encoder *sun4i_crtc_get_encoder(struct drm_crtc *crtc)
  40 {
  41         struct drm_encoder *encoder;
  42
  43         drm_for_each_encoder(encoder, crtc->dev)
  44                 if (encoder->crtc == crtc)
  45                         return encoder;
  46
  47         return NULL;
  48 }
  49
  50 static int sun4i_crtc_atomic_check(struct drm_crtc *crtc,
  51                                     struct drm_crtc_state *state)
  52 {
  53         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  54         struct sunxi_engine *engine = scrtc->engine;
  55         int ret = 0;
  56
  57         if (engine && engine->ops && engine->ops->atomic_check)
  58                 ret = engine->ops->atomic_check(engine, state);
  59
  60         return ret;
  61 }
  62
  63 static void sun4i_crtc_atomic_begin(struct drm_crtc *crtc,
  64                                     struct drm_crtc_state *old_state)
  65 {
  66         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  67         struct drm_device *dev = crtc->dev;
  68         struct sunxi_engine *engine = scrtc->engine;
  69         unsigned long flags;
  70
  71         if (crtc->state->event) {
  72                 WARN_ON(drm_crtc_vblank_get(crtc) != 0);
  73
  74                 spin_lock_irqsave(&dev->event_lock, flags);
  75                 scrtc->event = crtc->state->event;
  76                 spin_unlock_irqrestore(&dev->event_lock, flags);
  77                 crtc->state->event = NULL;
  78         }
  79
  80         if (engine->ops->atomic_begin)
  81                 engine->ops->atomic_begin(engine, old_state);
  82 }
  83
  84 static void sun4i_crtc_atomic_flush(struct drm_crtc *crtc,
  85                                     struct drm_crtc_state *old_state)
  86 {
  87         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  88         struct drm_pending_vblank_event *event = crtc->state->event;
  89
  90         DRM_DEBUG_DRIVER("Committing plane changes\n");
  91
  92         sunxi_engine_commit(scrtc->engine);
  93
  94         if (event) {
  95                 crtc->state->event = NULL;
  96
  97                 spin_lock_irq(&crtc->dev->event_lock);
  98                 if (drm_crtc_vblank_get(crtc) == 0)
  99                         drm_crtc_arm_vblank_event(crtc, event);
 100                 else
 101                         drm_crtc_send_vblank_event(crtc, event);
 102                 spin_unlock_irq(&crtc->dev->event_lock);
 103         }
 104 }
 105
 106 static void sun4i_crtc_atomic_disable(struct drm_crtc *crtc,
 107                                       struct drm_crtc_state *old_state)
 108 {
 109         struct drm_encoder *encoder = sun4i_crtc_get_encoder(crtc);
 110         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
 111
 112         DRM_DEBUG_DRIVER("Disabling the CRTC\n");
 113
 114         drm_crtc_vblank_off(crtc);
 115
 116         sun4i_tcon_set_status(scrtc->tcon, encoder, false);
 117
 118         if (crtc->state->event && !crtc->state->active) {
 119                 spin_lock_irq(&crtc->dev->event_lock);
 120                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 121                 spin_unlock_irq(&crtc->dev->event_lock);
 122
 123                 crtc->state->event = NULL;
 124         }
 125 }
 126
 127 static void sun4i_crtc_atomic_enable(struct drm_crtc *crtc,
 128                                      struct drm_crtc_state *old_state)
 129 {
 130         struct drm_encoder *encoder = sun4i_crtc_get_encoder(crtc);
 131         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
 132
 133         DRM_DEBUG_DRIVER("Enabling the CRTC\n");
 134
 135         sun4i_tcon_set_status(scrtc->tcon, encoder, true);
 136
 137         drm_crtc_vblank_on(crtc);
 138 }
 139
 140 static void sun4i_crtc_mode_set_nofb(struct drm_crtc *crtc)
 141 {
 142         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 143         struct drm_encoder *encoder = sun4i_crtc_get_encoder(crtc);
 144         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
 145
 146         sun4i_tcon_mode_set(scrtc->tcon, encoder, mode);
 147 }
 148
 149 static const struct drm_crtc_helper_funcs sun4i_crtc_helper_funcs = {
 150         .atomic_check   = sun4i_crtc_atomic_check,
 151         .atomic_begin   = sun4i_crtc_atomic_begin,
 152         .atomic_flush   = sun4i_crtc_atomic_flush,
 153         .atomic_enable  = sun4i_crtc_atomic_enable,
 154         .atomic_disable = sun4i_crtc_atomic_disable,
 155         .mode_set_nofb  = sun4i_crtc_mode_set_nofb,
 156 };
 157
 158 static int sun4i_crtc_enable_vblank(struct drm_crtc *crtc)
 159 {
 160         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
 161
 162         DRM_DEBUG_DRIVER("Enabling VBLANK on crtc %p\n", crtc);
 163
 164         sun4i_tcon_enable_vblank(scrtc->tcon, true);
 165
 166         return 0;
 167 }
 168
 169 static void sun4i_crtc_disable_vblank(struct drm_crtc *crtc)
 170 {
 171         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
 172
 173         DRM_DEBUG_DRIVER("Disabling VBLANK on crtc %p\n", crtc);
 174
 175         sun4i_tcon_enable_vblank(scrtc->tcon, false);
 176 }
 177
 178 static const struct drm_crtc_funcs sun4i_crtc_funcs = {
 179         .atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
 180         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 181         .destroy                = drm_crtc_cleanup,
 182         .page_flip              = drm_atomic_helper_page_flip,
 183         .reset                  = drm_atomic_helper_crtc_reset,
 184         .set_config             = drm_atomic_helper_set_config,
 185         .enable_vblank          = sun4i_crtc_enable_vblank,
 186         .disable_vblank         = sun4i_crtc_disable_vblank,
 187 };
 188
 189 struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
 190                                    struct sunxi_engine *engine,
 191                                    struct sun4i_tcon *tcon)
 192 {
 193         struct sun4i_crtc *scrtc;
 194         struct drm_plane **planes;
 195         struct drm_plane *primary = NULL, *cursor = NULL;
 196         int ret, i;
 197
 198         scrtc = devm_kzalloc(drm->dev, sizeof(*scrtc), GFP_KERNEL);
 199         if (!scrtc)
 200                 return ERR_PTR(-ENOMEM);
 201         scrtc->engine = engine;
 202         scrtc->tcon = tcon;
 203
 204         /* Create our layers */
 205         planes = sunxi_engine_layers_init(drm, engine);
 206         if (IS_ERR(planes)) {
 207                 dev_err(drm->dev, "Couldn't create the planes\n");
 208                 return NULL;
 209         }
 210
 211         /* find primary and cursor planes for drm_crtc_init_with_planes */
 212         for (i = 0; planes[i]; i++) {
 213                 struct drm_plane *plane = planes[i];
 214
 215                 switch (plane->type) {
 216                 case DRM_PLANE_TYPE_PRIMARY:
 217                         primary = plane;
 218                         break;
 219                 case DRM_PLANE_TYPE_CURSOR:
 220                         cursor = plane;
 221                         break;
 222                 default:
 223                         break;
 224                 }
 225         }
 226
 227         ret = drm_crtc_init_with_planes(drm, &scrtc->crtc,
 228                                         primary,
 229                                         cursor,
 230                                         &sun4i_crtc_funcs,
 231                                         NULL);
 232         if (ret) {
 233                 dev_err(drm->dev, "Couldn't init DRM CRTC\n");
 234                 return ERR_PTR(ret);
 235         }
 236
 237         drm_crtc_helper_add(&scrtc->crtc, &sun4i_crtc_helper_funcs);
 238
 239         /* Set crtc.port to output port node of the tcon */
 240         scrtc->crtc.port = of_graph_get_port_by_id(scrtc->tcon->dev->of_node,
 241                                                    1);
 242
 243         /* Set possible_crtcs to this crtc for overlay planes */
 244         for (i = 0; planes[i]; i++) {
 245                 uint32_t possible_crtcs = drm_crtc_mask(&scrtc->crtc);
 246                 struct drm_plane *plane = planes[i];
 247
 248                 if (plane->type == DRM_PLANE_TYPE_OVERLAY)
 249                         plane->possible_crtcs = possible_crtcs;
 250         }
 251
 252         return scrtc;
 253 }