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 "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 sun4i_drv *drv = scrtc->drv;
  55         struct drm_pending_vblank_event *event = crtc->state->event;
  56
  57         DRM_DEBUG_DRIVER("Committing plane changes\n");
  58
  59         sun4i_backend_commit(drv->backend);
  60
  61         if (event) {
  62                 crtc->state->event = NULL;
  63
  64                 spin_lock_irq(&crtc->dev->event_lock);
  65                 if (drm_crtc_vblank_get(crtc) == 0)
  66                         drm_crtc_arm_vblank_event(crtc, event);
  67                 else
  68                         drm_crtc_send_vblank_event(crtc, event);
  69                 spin_unlock_irq(&crtc->dev->event_lock);
  70         }
  71 }
  72
  73 static void sun4i_crtc_disable(struct drm_crtc *crtc)
  74 {
  75         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  76         struct sun4i_drv *drv = scrtc->drv;
  77
  78         DRM_DEBUG_DRIVER("Disabling the CRTC\n");
  79
  80         sun4i_tcon_disable(drv->tcon);
  81
  82         if (crtc->state->event && !crtc->state->active) {
  83                 spin_lock_irq(&crtc->dev->event_lock);
  84                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
  85                 spin_unlock_irq(&crtc->dev->event_lock);
  86
  87                 crtc->state->event = NULL;
  88         }
  89 }
  90
  91 static void sun4i_crtc_enable(struct drm_crtc *crtc)
  92 {
  93         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  94         struct sun4i_drv *drv = scrtc->drv;
  95
  96         DRM_DEBUG_DRIVER("Enabling the CRTC\n");
  97
  98         sun4i_tcon_enable(drv->tcon);
  99 }
 100
 101 static const struct drm_crtc_helper_funcs sun4i_crtc_helper_funcs = {
 102         .atomic_begin   = sun4i_crtc_atomic_begin,
 103         .atomic_flush   = sun4i_crtc_atomic_flush,
 104         .disable        = sun4i_crtc_disable,
 105         .enable         = sun4i_crtc_enable,
 106 };
 107
 108 static const struct drm_crtc_funcs sun4i_crtc_funcs = {
 109         .atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
 110         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 111         .destroy                = drm_crtc_cleanup,
 112         .page_flip              = drm_atomic_helper_page_flip,
 113         .reset                  = drm_atomic_helper_crtc_reset,
 114         .set_config             = drm_atomic_helper_set_config,
 115 };
 116
 117 struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm)
 118 {
 119         struct sun4i_drv *drv = drm->dev_private;
 120         struct sun4i_crtc *scrtc;
 121         int ret;
 122
 123         scrtc = devm_kzalloc(drm->dev, sizeof(*scrtc), GFP_KERNEL);
 124         if (!scrtc)
 125                 return NULL;
 126         scrtc->drv = drv;
 127
 128         ret = drm_crtc_init_with_planes(drm, &scrtc->crtc,
 129                                         drv->primary,
 130                                         NULL,
 131                                         &sun4i_crtc_funcs,
 132                                         NULL);
 133         if (ret) {
 134                 dev_err(drm->dev, "Couldn't init DRM CRTC\n");
 135                 return NULL;
 136         }
 137
 138         drm_crtc_helper_add(&scrtc->crtc, &sun4i_crtc_helper_funcs);
 139
 140         /* Set crtc.port to output port node of the tcon */
 141         scrtc->crtc.port = of_graph_get_port_by_id(drv->tcon->dev->of_node,
 142                                                    1);
 143
 144         return scrtc;
 145 }