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_irq.h>
  23 #include <linux/regmap.h>
  24
  25 #include <video/videomode.h>
  26
  27 #include "sun4i_backend.h"
  28 #include "sun4i_crtc.h"
  29 #include "sun4i_drv.h"
  30 #include "sun4i_tcon.h"
  31
  32 static void sun4i_crtc_atomic_begin(struct drm_crtc *crtc,
  33                                     struct drm_crtc_state *old_state)
  34 {
  35         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  36         struct drm_device *dev = crtc->dev;
  37         unsigned long flags;
  38
  39         if (crtc->state->event) {
  40                 WARN_ON(drm_crtc_vblank_get(crtc) != 0);
  41
  42                 spin_lock_irqsave(&dev->event_lock, flags);
  43                 scrtc->event = crtc->state->event;
  44                 spin_unlock_irqrestore(&dev->event_lock, flags);
  45                 crtc->state->event = NULL;
  46          }
  47 }
  48
  49 static void sun4i_crtc_atomic_flush(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 sun4i_drv *drv = scrtc->drv;
  54         struct drm_pending_vblank_event *event = crtc->state->event;
  55
  56         DRM_DEBUG_DRIVER("Committing plane changes\n");
  57
  58         sun4i_backend_commit(drv->backend);
  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_disable(struct drm_crtc *crtc)
  73 {
  74         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  75         struct sun4i_drv *drv = scrtc->drv;
  76
  77         DRM_DEBUG_DRIVER("Disabling the CRTC\n");
  78
  79         sun4i_tcon_disable(drv->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_enable(struct drm_crtc *crtc)
  91 {
  92         struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
  93         struct sun4i_drv *drv = scrtc->drv;
  94
  95         DRM_DEBUG_DRIVER("Enabling the CRTC\n");
  96
  97         sun4i_tcon_enable(drv->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         .disable        = sun4i_crtc_disable,
 104         .enable         = sun4i_crtc_enable,
 105 };
 106
 107 static const struct drm_crtc_funcs sun4i_crtc_funcs = {
 108         .atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
 109         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 110         .destroy                = drm_crtc_cleanup,
 111         .page_flip              = drm_atomic_helper_page_flip,
 112         .reset                  = drm_atomic_helper_crtc_reset,
 113         .set_config             = drm_atomic_helper_set_config,
 114 };
 115
 116 struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm)
 117 {
 118         struct sun4i_drv *drv = drm->dev_private;
 119         struct sun4i_crtc *scrtc;
 120         int ret;
 121
 122         scrtc = devm_kzalloc(drm->dev, sizeof(*scrtc), GFP_KERNEL);
 123         if (!scrtc)
 124                 return NULL;
 125         scrtc->drv = drv;
 126
 127         ret = drm_crtc_init_with_planes(drm, &scrtc->crtc,
 128                                         drv->primary,
 129                                         NULL,
 130                                         &sun4i_crtc_funcs,
 131                                         NULL);
 132         if (ret) {
 133                 dev_err(drm->dev, "Couldn't init DRM CRTC\n");
 134                 return NULL;
 135         }
 136
 137         drm_crtc_helper_add(&scrtc->crtc, &sun4i_crtc_helper_funcs);
 138
 139         return scrtc;
 140 }