1/* 2 * Copyright (C) 2014 Traphandler 3 * Copyright (C) 2014 Free Electrons 4 * 5 * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com> 6 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License version 2 as published by 10 * the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * You should have received a copy of the GNU General Public License along with 18 * this program. If not, see <http://www.gnu.org/licenses/>. 19 */ 20 21#include <linux/clk.h> 22#include <linux/pm.h> 23#include <linux/pm_runtime.h> 24#include <linux/pinctrl/consumer.h> 25 26#include <drm/drm_crtc.h> 27#include <drm/drm_crtc_helper.h> 28#include <drm/drmP.h> 29 30#include <video/videomode.h> 31 32#include "atmel_hlcdc_dc.h" 33 34/** 35 * Atmel HLCDC CRTC structure 36 * 37 * @base: base DRM CRTC structure 38 * @hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device 39 * @event: pointer to the current page flip event 40 * @id: CRTC id (returned by drm_crtc_index) 41 * @enabled: CRTC state 42 */ 43struct atmel_hlcdc_crtc { 44 struct drm_crtc base; 45 struct atmel_hlcdc_dc *dc; 46 struct drm_pending_vblank_event *event; 47 int id; 48 bool enabled; 49}; 50 51static inline struct atmel_hlcdc_crtc * 52drm_crtc_to_atmel_hlcdc_crtc(struct drm_crtc *crtc) 53{ 54 return container_of(crtc, struct atmel_hlcdc_crtc, base); 55} 56 57static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c) 58{ 59 struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c); 60 struct regmap *regmap = crtc->dc->hlcdc->regmap; 61 struct drm_display_mode *adj = &c->state->adjusted_mode; 62 unsigned long mode_rate; 63 struct videomode vm; 64 unsigned long prate; 65 unsigned int cfg; 66 int div; 67 68 vm.vfront_porch = adj->crtc_vsync_start - adj->crtc_vdisplay; 69 vm.vback_porch = adj->crtc_vtotal - adj->crtc_vsync_end; 70 vm.vsync_len = adj->crtc_vsync_end - adj->crtc_vsync_start; 71 vm.hfront_porch = adj->crtc_hsync_start - adj->crtc_hdisplay; 72 vm.hback_porch = adj->crtc_htotal - adj->crtc_hsync_end; 73 vm.hsync_len = adj->crtc_hsync_end - adj->crtc_hsync_start; 74 75 regmap_write(regmap, ATMEL_HLCDC_CFG(1), 76 (vm.hsync_len - 1) | ((vm.vsync_len - 1) << 16)); 77 78 regmap_write(regmap, ATMEL_HLCDC_CFG(2), 79 (vm.vfront_porch - 1) | (vm.vback_porch << 16)); 80 81 regmap_write(regmap, ATMEL_HLCDC_CFG(3), 82 (vm.hfront_porch - 1) | ((vm.hback_porch - 1) << 16)); 83 84 regmap_write(regmap, ATMEL_HLCDC_CFG(4), 85 (adj->crtc_hdisplay - 1) | 86 ((adj->crtc_vdisplay - 1) << 16)); 87 88 cfg = 0; 89 90 prate = clk_get_rate(crtc->dc->hlcdc->sys_clk); 91 mode_rate = adj->crtc_clock * 1000; 92 if ((prate / 2) < mode_rate) { 93 prate *= 2; 94 cfg |= ATMEL_HLCDC_CLKSEL; 95 } 96 97 div = DIV_ROUND_UP(prate, mode_rate); 98 if (div < 2) 99 div = 2; 100 101 cfg |= ATMEL_HLCDC_CLKDIV(div); 102 103 regmap_update_bits(regmap, ATMEL_HLCDC_CFG(0), 104 ATMEL_HLCDC_CLKSEL | ATMEL_HLCDC_CLKDIV_MASK | 105 ATMEL_HLCDC_CLKPOL, cfg); 106 107 cfg = 0; 108 109 if (adj->flags & DRM_MODE_FLAG_NVSYNC) 110 cfg |= ATMEL_HLCDC_VSPOL; 111 112 if (adj->flags & DRM_MODE_FLAG_NHSYNC) 113 cfg |= ATMEL_HLCDC_HSPOL; 114 115 regmap_update_bits(regmap, ATMEL_HLCDC_CFG(5), 116 ATMEL_HLCDC_HSPOL | ATMEL_HLCDC_VSPOL | 117 ATMEL_HLCDC_VSPDLYS | ATMEL_HLCDC_VSPDLYE | 118 ATMEL_HLCDC_DISPPOL | ATMEL_HLCDC_DISPDLY | 119 ATMEL_HLCDC_VSPSU | ATMEL_HLCDC_VSPHO | 120 ATMEL_HLCDC_GUARDTIME_MASK, 121 cfg); 122} 123 124static bool atmel_hlcdc_crtc_mode_fixup(struct drm_crtc *crtc, 125 const struct drm_display_mode *mode, 126 struct drm_display_mode *adjusted_mode) 127{ 128 return true; 129} 130 131static void atmel_hlcdc_crtc_disable(struct drm_crtc *c) 132{ 133 struct drm_device *dev = c->dev; 134 struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c); 135 struct regmap *regmap = crtc->dc->hlcdc->regmap; 136 unsigned int status; 137 138 if (!crtc->enabled) 139 return; 140 141 drm_crtc_vblank_off(c); 142 143 pm_runtime_get_sync(dev->dev); 144 145 regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_DISP); 146 while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) && 147 (status & ATMEL_HLCDC_DISP)) 148 cpu_relax(); 149 150 regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_SYNC); 151 while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) && 152 (status & ATMEL_HLCDC_SYNC)) 153 cpu_relax(); 154 155 regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_PIXEL_CLK); 156 while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) && 157 (status & ATMEL_HLCDC_PIXEL_CLK)) 158 cpu_relax(); 159 160 clk_disable_unprepare(crtc->dc->hlcdc->sys_clk); 161 pinctrl_pm_select_sleep_state(dev->dev); 162 163 pm_runtime_allow(dev->dev); 164 165 pm_runtime_put_sync(dev->dev); 166 167 crtc->enabled = false; 168} 169 170static void atmel_hlcdc_crtc_enable(struct drm_crtc *c) 171{ 172 struct drm_device *dev = c->dev; 173 struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c); 174 struct regmap *regmap = crtc->dc->hlcdc->regmap; 175 unsigned int status; 176 177 if (crtc->enabled) 178 return; 179 180 pm_runtime_get_sync(dev->dev); 181 182 pm_runtime_forbid(dev->dev); 183 184 pinctrl_pm_select_default_state(dev->dev); 185 clk_prepare_enable(crtc->dc->hlcdc->sys_clk); 186 187 regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_PIXEL_CLK); 188 while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) && 189 !(status & ATMEL_HLCDC_PIXEL_CLK)) 190 cpu_relax(); 191 192 193 regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_SYNC); 194 while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) && 195 !(status & ATMEL_HLCDC_SYNC)) 196 cpu_relax(); 197 198 regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_DISP); 199 while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) && 200 !(status & ATMEL_HLCDC_DISP)) 201 cpu_relax(); 202 203 pm_runtime_put_sync(dev->dev); 204 205 drm_crtc_vblank_on(c); 206 207 crtc->enabled = true; 208} 209 210void atmel_hlcdc_crtc_suspend(struct drm_crtc *c) 211{ 212 struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c); 213 214 if (crtc->enabled) { 215 atmel_hlcdc_crtc_disable(c); 216 /* save enable state for resume */ 217 crtc->enabled = true; 218 } 219} 220 221void atmel_hlcdc_crtc_resume(struct drm_crtc *c) 222{ 223 struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c); 224 225 if (crtc->enabled) { 226 crtc->enabled = false; 227 atmel_hlcdc_crtc_enable(c); 228 } 229} 230 231static int atmel_hlcdc_crtc_atomic_check(struct drm_crtc *c, 232 struct drm_crtc_state *s) 233{ 234 struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c); 235 236 if (atmel_hlcdc_dc_mode_valid(crtc->dc, &s->adjusted_mode) != MODE_OK) 237 return -EINVAL; 238 239 return atmel_hlcdc_plane_prepare_disc_area(s); 240} 241 242static void atmel_hlcdc_crtc_atomic_begin(struct drm_crtc *c) 243{ 244 struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c); 245 246 if (c->state->event) { 247 c->state->event->pipe = drm_crtc_index(c); 248 249 WARN_ON(drm_crtc_vblank_get(c) != 0); 250 251 crtc->event = c->state->event; 252 c->state->event = NULL; 253 } 254} 255 256static void atmel_hlcdc_crtc_atomic_flush(struct drm_crtc *crtc) 257{ 258 /* TODO: write common plane control register if available */ 259} 260 261static const struct drm_crtc_helper_funcs lcdc_crtc_helper_funcs = { 262 .mode_fixup = atmel_hlcdc_crtc_mode_fixup, 263 .mode_set = drm_helper_crtc_mode_set, 264 .mode_set_nofb = atmel_hlcdc_crtc_mode_set_nofb, 265 .mode_set_base = drm_helper_crtc_mode_set_base, 266 .disable = atmel_hlcdc_crtc_disable, 267 .enable = atmel_hlcdc_crtc_enable, 268 .atomic_check = atmel_hlcdc_crtc_atomic_check, 269 .atomic_begin = atmel_hlcdc_crtc_atomic_begin, 270 .atomic_flush = atmel_hlcdc_crtc_atomic_flush, 271}; 272 273static void atmel_hlcdc_crtc_destroy(struct drm_crtc *c) 274{ 275 struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c); 276 277 drm_crtc_cleanup(c); 278 kfree(crtc); 279} 280 281void atmel_hlcdc_crtc_cancel_page_flip(struct drm_crtc *c, 282 struct drm_file *file) 283{ 284 struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c); 285 struct drm_pending_vblank_event *event; 286 struct drm_device *dev = c->dev; 287 unsigned long flags; 288 289 spin_lock_irqsave(&dev->event_lock, flags); 290 event = crtc->event; 291 if (event && event->base.file_priv == file) { 292 event->base.destroy(&event->base); 293 drm_vblank_put(dev, crtc->id); 294 crtc->event = NULL; 295 } 296 spin_unlock_irqrestore(&dev->event_lock, flags); 297} 298 299static void atmel_hlcdc_crtc_finish_page_flip(struct atmel_hlcdc_crtc *crtc) 300{ 301 struct drm_device *dev = crtc->base.dev; 302 unsigned long flags; 303 304 spin_lock_irqsave(&dev->event_lock, flags); 305 if (crtc->event) { 306 drm_send_vblank_event(dev, crtc->id, crtc->event); 307 drm_vblank_put(dev, crtc->id); 308 crtc->event = NULL; 309 } 310 spin_unlock_irqrestore(&dev->event_lock, flags); 311} 312 313void atmel_hlcdc_crtc_irq(struct drm_crtc *c) 314{ 315 drm_handle_vblank(c->dev, 0); 316 atmel_hlcdc_crtc_finish_page_flip(drm_crtc_to_atmel_hlcdc_crtc(c)); 317} 318 319static const struct drm_crtc_funcs atmel_hlcdc_crtc_funcs = { 320 .page_flip = drm_atomic_helper_page_flip, 321 .set_config = drm_atomic_helper_set_config, 322 .destroy = atmel_hlcdc_crtc_destroy, 323 .reset = drm_atomic_helper_crtc_reset, 324 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, 325 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, 326}; 327 328int atmel_hlcdc_crtc_create(struct drm_device *dev) 329{ 330 struct atmel_hlcdc_dc *dc = dev->dev_private; 331 struct atmel_hlcdc_planes *planes = dc->planes; 332 struct atmel_hlcdc_crtc *crtc; 333 int ret; 334 int i; 335 336 crtc = kzalloc(sizeof(*crtc), GFP_KERNEL); 337 if (!crtc) 338 return -ENOMEM; 339 340 crtc->dc = dc; 341 342 ret = drm_crtc_init_with_planes(dev, &crtc->base, 343 &planes->primary->base, 344 planes->cursor ? &planes->cursor->base : NULL, 345 &atmel_hlcdc_crtc_funcs); 346 if (ret < 0) 347 goto fail; 348 349 crtc->id = drm_crtc_index(&crtc->base); 350 351 if (planes->cursor) 352 planes->cursor->base.possible_crtcs = 1 << crtc->id; 353 354 for (i = 0; i < planes->noverlays; i++) 355 planes->overlays[i]->base.possible_crtcs = 1 << crtc->id; 356 357 drm_crtc_helper_add(&crtc->base, &lcdc_crtc_helper_funcs); 358 359 dc->crtc = &crtc->base; 360 361 return 0; 362 363fail: 364 atmel_hlcdc_crtc_destroy(&crtc->base); 365 return ret; 366} 367 368