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