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