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_atomic_disable(struct drm_crtc *crtc,
  73                                       struct drm_crtc_state *old_state)
  74 {
  75         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  76
  77         DRM_DEBUG_DRIVER("Disabling the CRTC\n");
  78
  79         sun4i_tcon_disable(scrtc->tcon);
  80
  81         if (crtc->state->event && !crtc->state->active) {
  82                 spin_lock_irq(&crtc->dev->event_lock);
  83                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
  84                 spin_unlock_irq(&crtc->dev->event_lock);
  85
  86                 crtc->state->event = NULL;
  87         }
  88 }
  89
  90 static void sun4i_crtc_atomic_enable(struct drm_crtc *crtc,
  91                                      struct drm_crtc_state *old_state)
  92 {
  93         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  94
  95         DRM_DEBUG_DRIVER("Enabling the CRTC\n");
  96
  97         sun4i_tcon_enable(scrtc->tcon);
  98 }
  99
 100 static const struct drm_crtc_helper_funcs sun4i_crtc_helper_funcs = {
 101         .atomic_begin   = sun4i_crtc_atomic_begin,
 102         .atomic_flush   = sun4i_crtc_atomic_flush,
 103         .atomic_enable  = sun4i_crtc_atomic_enable,
 104         .atomic_disable = sun4i_crtc_atomic_disable,
 105 };
 106
 107 static int sun4i_crtc_enable_vblank(struct drm_crtc *crtc)
 108 {
 109         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
 110
 111         DRM_DEBUG_DRIVER("Enabling VBLANK on crtc %p\n", crtc);
 112
 113         sun4i_tcon_enable_vblank(scrtc->tcon, true);
 114
 115         return 0;
 116 }
 117
 118 static void sun4i_crtc_disable_vblank(struct drm_crtc *crtc)
 119 {
 120         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
 121
 122         DRM_DEBUG_DRIVER("Disabling VBLANK on crtc %p\n", crtc);
 123
 124         sun4i_tcon_enable_vblank(scrtc->tcon, false);
 125 }
 126
 127 static const struct drm_crtc_funcs sun4i_crtc_funcs = {
 128         .atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
 129         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 130         .destroy                = drm_crtc_cleanup,
 131         .page_flip              = drm_atomic_helper_page_flip,
 132         .reset                  = drm_atomic_helper_crtc_reset,
 133         .set_config             = drm_atomic_helper_set_config,
 134         .enable_vblank          = sun4i_crtc_enable_vblank,
 135         .disable_vblank         = sun4i_crtc_disable_vblank,
 136 };
 137
 138 struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
 139                                    struct sunxi_engine *engine,
 140                                    struct sun4i_tcon *tcon)
 141 {
 142         struct sun4i_crtc *scrtc;
 143         struct drm_plane **planes;
 144         struct drm_plane *primary = NULL, *cursor = NULL;
 145         int ret, i;
 146
 147         scrtc = devm_kzalloc(drm->dev, sizeof(*scrtc), GFP_KERNEL);
 148         if (!scrtc)
 149                 return ERR_PTR(-ENOMEM);
 150         scrtc->engine = engine;
 151         scrtc->tcon = tcon;
 152
 153         /* Create our layers */
 154         planes = sunxi_engine_layers_init(drm, engine);
 155         if (IS_ERR(planes)) {
 156                 dev_err(drm->dev, "Couldn't create the planes\n");
 157                 return NULL;
 158         }
 159
 160         /* find primary and cursor planes for drm_crtc_init_with_planes */
 161         for (i = 0; planes[i]; i++) {
 162                 struct drm_plane *plane = planes[i];
 163
 164                 switch (plane->type) {
 165                 case DRM_PLANE_TYPE_PRIMARY:
 166                         primary = plane;
 167                         break;
 168                 case DRM_PLANE_TYPE_CURSOR:
 169                         cursor = plane;
 170                         break;
 171                 default:
 172                         break;
 173                 }
 174         }
 175
 176         ret = drm_crtc_init_with_planes(drm, &scrtc->crtc,
 177                                         primary,
 178                                         cursor,
 179                                         &sun4i_crtc_funcs,
 180                                         NULL);
 181         if (ret) {
 182                 dev_err(drm->dev, "Couldn't init DRM CRTC\n");
 183                 return ERR_PTR(ret);
 184         }
 185
 186         drm_crtc_helper_add(&scrtc->crtc, &sun4i_crtc_helper_funcs);
 187
 188         /* Set crtc.port to output port node of the tcon */
 189         scrtc->crtc.port = of_graph_get_port_by_id(scrtc->tcon->dev->of_node,
 190                                                    1);
 191
 192         /* Set possible_crtcs to this crtc for overlay planes */
 193         for (i = 0; planes[i]; i++) {
 194                 uint32_t possible_crtcs = BIT(drm_crtc_index(&scrtc->crtc));
 195                 struct drm_plane *plane = planes[i];
 196
 197                 if (plane->type == DRM_PLANE_TYPE_OVERLAY)
 198                         plane->possible_crtcs = possible_crtcs;
 199         }
 200
 201         return scrtc;
 202 }