drivers/gpu/drm/sun4i/sun4i_crtc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2015 Free Electrons
   4  * Copyright (C) 2015 NextThing Co
   5  *
   6  * Maxime Ripard <maxime.ripard@free-electrons.com>
   7  */
   8
   9 #include <drm/drmP.h>
  10 #include <drm/drm_atomic_helper.h>
  11 #include <drm/drm_crtc.h>
  12 #include <drm/drm_modes.h>
  13 #include <drm/drm_probe_helper.h>
  14
  15 #include <linux/clk-provider.h>
  16 #include <linux/ioport.h>
  17 #include <linux/of_address.h>
  18 #include <linux/of_graph.h>
  19 #include <linux/of_irq.h>
  20 #include <linux/regmap.h>
  21
  22 #include <video/videomode.h>
  23
  24 #include "sun4i_backend.h"
  25 #include "sun4i_crtc.h"
  26 #include "sun4i_drv.h"
  27 #include "sunxi_engine.h"
  28 #include "sun4i_tcon.h"
  29
  30 /*
  31  * While this isn't really working in the DRM theory, in practice we
  32  * can only ever have one encoder per TCON since we have a mux in our
  33  * TCON.
  34  */
  35 static struct drm_encoder *sun4i_crtc_get_encoder(struct drm_crtc *crtc)
  36 {
  37         struct drm_encoder *encoder;
  38
  39         drm_for_each_encoder(encoder, crtc->dev)
  40                 if (encoder->crtc == crtc)
  41                         return encoder;
  42
  43         return NULL;
  44 }
  45
  46 static int sun4i_crtc_atomic_check(struct drm_crtc *crtc,
  47                                     struct drm_crtc_state *state)
  48 {
  49         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  50         struct sunxi_engine *engine = scrtc->engine;
  51         int ret = 0;
  52
  53         if (engine && engine->ops && engine->ops->atomic_check)
  54                 ret = engine->ops->atomic_check(engine, state);
  55
  56         return ret;
  57 }
  58
  59 static void sun4i_crtc_atomic_begin(struct drm_crtc *crtc,
  60                                     struct drm_crtc_state *old_state)
  61 {
  62         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  63         struct drm_device *dev = crtc->dev;
  64         struct sunxi_engine *engine = scrtc->engine;
  65         unsigned long flags;
  66
  67         if (crtc->state->event) {
  68                 WARN_ON(drm_crtc_vblank_get(crtc) != 0);
  69
  70                 spin_lock_irqsave(&dev->event_lock, flags);
  71                 scrtc->event = crtc->state->event;
  72                 spin_unlock_irqrestore(&dev->event_lock, flags);
  73                 crtc->state->event = NULL;
  74         }
  75
  76         if (engine->ops->atomic_begin)
  77                 engine->ops->atomic_begin(engine, old_state);
  78 }
  79
  80 static void sun4i_crtc_atomic_flush(struct drm_crtc *crtc,
  81                                     struct drm_crtc_state *old_state)
  82 {
  83         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  84         struct drm_pending_vblank_event *event = crtc->state->event;
  85
  86         DRM_DEBUG_DRIVER("Committing plane changes\n");
  87
  88         sunxi_engine_commit(scrtc->engine);
  89
  90         if (event) {
  91                 crtc->state->event = NULL;
  92
  93                 spin_lock_irq(&crtc->dev->event_lock);
  94                 if (drm_crtc_vblank_get(crtc) == 0)
  95                         drm_crtc_arm_vblank_event(crtc, event);
  96                 else
  97                         drm_crtc_send_vblank_event(crtc, event);
  98                 spin_unlock_irq(&crtc->dev->event_lock);
  99         }
 100 }
 101
 102 static void sun4i_crtc_atomic_disable(struct drm_crtc *crtc,
 103                                       struct drm_crtc_state *old_state)
 104 {
 105         struct drm_encoder *encoder = sun4i_crtc_get_encoder(crtc);
 106         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
 107
 108         DRM_DEBUG_DRIVER("Disabling the CRTC\n");
 109
 110         drm_crtc_vblank_off(crtc);
 111
 112         sun4i_tcon_set_status(scrtc->tcon, encoder, false);
 113
 114         if (crtc->state->event && !crtc->state->active) {
 115                 spin_lock_irq(&crtc->dev->event_lock);
 116                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 117                 spin_unlock_irq(&crtc->dev->event_lock);
 118
 119                 crtc->state->event = NULL;
 120         }
 121 }
 122
 123 static void sun4i_crtc_atomic_enable(struct drm_crtc *crtc,
 124                                      struct drm_crtc_state *old_state)
 125 {
 126         struct drm_encoder *encoder = sun4i_crtc_get_encoder(crtc);
 127         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
 128
 129         DRM_DEBUG_DRIVER("Enabling the CRTC\n");
 130
 131         sun4i_tcon_set_status(scrtc->tcon, encoder, true);
 132
 133         drm_crtc_vblank_on(crtc);
 134 }
 135
 136 static void sun4i_crtc_mode_set_nofb(struct drm_crtc *crtc)
 137 {
 138         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 139         struct drm_encoder *encoder = sun4i_crtc_get_encoder(crtc);
 140         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
 141
 142         sun4i_tcon_mode_set(scrtc->tcon, encoder, mode);
 143 }
 144
 145 static const struct drm_crtc_helper_funcs sun4i_crtc_helper_funcs = {
 146         .atomic_check   = sun4i_crtc_atomic_check,
 147         .atomic_begin   = sun4i_crtc_atomic_begin,
 148         .atomic_flush   = sun4i_crtc_atomic_flush,
 149         .atomic_enable  = sun4i_crtc_atomic_enable,
 150         .atomic_disable = sun4i_crtc_atomic_disable,
 151         .mode_set_nofb  = sun4i_crtc_mode_set_nofb,
 152 };
 153
 154 static int sun4i_crtc_enable_vblank(struct drm_crtc *crtc)
 155 {
 156         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
 157
 158         DRM_DEBUG_DRIVER("Enabling VBLANK on crtc %p\n", crtc);
 159
 160         sun4i_tcon_enable_vblank(scrtc->tcon, true);
 161
 162         return 0;
 163 }
 164
 165 static void sun4i_crtc_disable_vblank(struct drm_crtc *crtc)
 166 {
 167         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
 168
 169         DRM_DEBUG_DRIVER("Disabling VBLANK on crtc %p\n", crtc);
 170
 171         sun4i_tcon_enable_vblank(scrtc->tcon, false);
 172 }
 173
 174 static const struct drm_crtc_funcs sun4i_crtc_funcs = {
 175         .atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
 176         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 177         .destroy                = drm_crtc_cleanup,
 178         .page_flip              = drm_atomic_helper_page_flip,
 179         .reset                  = drm_atomic_helper_crtc_reset,
 180         .set_config             = drm_atomic_helper_set_config,
 181         .enable_vblank          = sun4i_crtc_enable_vblank,
 182         .disable_vblank         = sun4i_crtc_disable_vblank,
 183 };
 184
 185 struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
 186                                    struct sunxi_engine *engine,
 187                                    struct sun4i_tcon *tcon)
 188 {
 189         struct sun4i_crtc *scrtc;
 190         struct drm_plane **planes;
 191         struct drm_plane *primary = NULL, *cursor = NULL;
 192         int ret, i;
 193
 194         scrtc = devm_kzalloc(drm->dev, sizeof(*scrtc), GFP_KERNEL);
 195         if (!scrtc)
 196                 return ERR_PTR(-ENOMEM);
 197         scrtc->engine = engine;
 198         scrtc->tcon = tcon;
 199
 200         /* Create our layers */
 201         planes = sunxi_engine_layers_init(drm, engine);
 202         if (IS_ERR(planes)) {
 203                 dev_err(drm->dev, "Couldn't create the planes\n");
 204                 return NULL;
 205         }
 206
 207         /* find primary and cursor planes for drm_crtc_init_with_planes */
 208         for (i = 0; planes[i]; i++) {
 209                 struct drm_plane *plane = planes[i];
 210
 211                 switch (plane->type) {
 212                 case DRM_PLANE_TYPE_PRIMARY:
 213                         primary = plane;
 214                         break;
 215                 case DRM_PLANE_TYPE_CURSOR:
 216                         cursor = plane;
 217                         break;
 218                 default:
 219                         break;
 220                 }
 221         }
 222
 223         ret = drm_crtc_init_with_planes(drm, &scrtc->crtc,
 224                                         primary,
 225                                         cursor,
 226                                         &sun4i_crtc_funcs,
 227                                         NULL);
 228         if (ret) {
 229                 dev_err(drm->dev, "Couldn't init DRM CRTC\n");
 230                 return ERR_PTR(ret);
 231         }
 232
 233         drm_crtc_helper_add(&scrtc->crtc, &sun4i_crtc_helper_funcs);
 234
 235         /* Set crtc.port to output port node of the tcon */
 236         scrtc->crtc.port = of_graph_get_port_by_id(scrtc->tcon->dev->of_node,
 237                                                    1);
 238
 239         /* Set possible_crtcs to this crtc for overlay planes */
 240         for (i = 0; planes[i]; i++) {
 241                 uint32_t possible_crtcs = drm_crtc_mask(&scrtc->crtc);
 242                 struct drm_plane *plane = planes[i];
 243
 244                 if (plane->type == DRM_PLANE_TYPE_OVERLAY)
 245                         plane->possible_crtcs = possible_crtcs;
 246         }
 247
 248         return scrtc;
 249 }