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 } 231