1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ZynqMP DisplayPort Driver 4 * 5 * Copyright (C) 2017 - 2020 Xilinx, Inc. 6 * 7 * Authors: 8 * - Hyun Woo Kwon <hyun.kwon@xilinx.com> 9 * - Laurent Pinchart <laurent.pinchart@ideasonboard.com> 10 */ 11 12 #include <drm/drm_atomic_helper.h> 13 #include <drm/drm_connector.h> 14 #include <drm/drm_crtc.h> 15 #include <drm/drm_device.h> 16 #include <drm/drm_dp_helper.h> 17 #include <drm/drm_edid.h> 18 #include <drm/drm_encoder.h> 19 #include <drm/drm_managed.h> 20 #include <drm/drm_modes.h> 21 #include <drm/drm_of.h> 22 #include <drm/drm_probe_helper.h> 23 #include <drm/drm_simple_kms_helper.h> 24 25 #include <linux/clk.h> 26 #include <linux/delay.h> 27 #include <linux/device.h> 28 #include <linux/module.h> 29 #include <linux/platform_device.h> 30 #include <linux/pm_runtime.h> 31 #include <linux/phy/phy.h> 32 #include <linux/reset.h> 33 34 #include "zynqmp_disp.h" 35 #include "zynqmp_dp.h" 36 #include "zynqmp_dpsub.h" 37 38 static uint zynqmp_dp_aux_timeout_ms = 50; 39 module_param_named(aux_timeout_ms, zynqmp_dp_aux_timeout_ms, uint, 0444); 40 MODULE_PARM_DESC(aux_timeout_ms, "DP aux timeout value in msec (default: 50)"); 41 42 /* 43 * Some sink requires a delay after power on request 44 */ 45 static uint zynqmp_dp_power_on_delay_ms = 4; 46 module_param_named(power_on_delay_ms, zynqmp_dp_power_on_delay_ms, uint, 0444); 47 MODULE_PARM_DESC(power_on_delay_ms, "DP power on delay in msec (default: 4)"); 48 49 /* Link configuration registers */ 50 #define ZYNQMP_DP_LINK_BW_SET 0x0 51 #define ZYNQMP_DP_LANE_COUNT_SET 0x4 52 #define ZYNQMP_DP_ENHANCED_FRAME_EN 0x8 53 #define ZYNQMP_DP_TRAINING_PATTERN_SET 0xc 54 #define ZYNQMP_DP_SCRAMBLING_DISABLE 0x14 55 #define ZYNQMP_DP_DOWNSPREAD_CTL 0x18 56 #define ZYNQMP_DP_SOFTWARE_RESET 0x1c 57 #define ZYNQMP_DP_SOFTWARE_RESET_STREAM1 BIT(0) 58 #define ZYNQMP_DP_SOFTWARE_RESET_STREAM2 BIT(1) 59 #define ZYNQMP_DP_SOFTWARE_RESET_STREAM3 BIT(2) 60 #define ZYNQMP_DP_SOFTWARE_RESET_STREAM4 BIT(3) 61 #define ZYNQMP_DP_SOFTWARE_RESET_AUX BIT(7) 62 #define ZYNQMP_DP_SOFTWARE_RESET_ALL (ZYNQMP_DP_SOFTWARE_RESET_STREAM1 | \ 63 ZYNQMP_DP_SOFTWARE_RESET_STREAM2 | \ 64 ZYNQMP_DP_SOFTWARE_RESET_STREAM3 | \ 65 ZYNQMP_DP_SOFTWARE_RESET_STREAM4 | \ 66 ZYNQMP_DP_SOFTWARE_RESET_AUX) 67 68 /* Core enable registers */ 69 #define ZYNQMP_DP_TRANSMITTER_ENABLE 0x80 70 #define ZYNQMP_DP_MAIN_STREAM_ENABLE 0x84 71 #define ZYNQMP_DP_FORCE_SCRAMBLER_RESET 0xc0 72 #define ZYNQMP_DP_VERSION 0xf8 73 #define ZYNQMP_DP_VERSION_MAJOR_MASK GENMASK(31, 24) 74 #define ZYNQMP_DP_VERSION_MAJOR_SHIFT 24 75 #define ZYNQMP_DP_VERSION_MINOR_MASK GENMASK(23, 16) 76 #define ZYNQMP_DP_VERSION_MINOR_SHIFT 16 77 #define ZYNQMP_DP_VERSION_REVISION_MASK GENMASK(15, 12) 78 #define ZYNQMP_DP_VERSION_REVISION_SHIFT 12 79 #define ZYNQMP_DP_VERSION_PATCH_MASK GENMASK(11, 8) 80 #define ZYNQMP_DP_VERSION_PATCH_SHIFT 8 81 #define ZYNQMP_DP_VERSION_INTERNAL_MASK GENMASK(7, 0) 82 #define ZYNQMP_DP_VERSION_INTERNAL_SHIFT 0 83 84 /* Core ID registers */ 85 #define ZYNQMP_DP_CORE_ID 0xfc 86 #define ZYNQMP_DP_CORE_ID_MAJOR_MASK GENMASK(31, 24) 87 #define ZYNQMP_DP_CORE_ID_MAJOR_SHIFT 24 88 #define ZYNQMP_DP_CORE_ID_MINOR_MASK GENMASK(23, 16) 89 #define ZYNQMP_DP_CORE_ID_MINOR_SHIFT 16 90 #define ZYNQMP_DP_CORE_ID_REVISION_MASK GENMASK(15, 8) 91 #define ZYNQMP_DP_CORE_ID_REVISION_SHIFT 8 92 #define ZYNQMP_DP_CORE_ID_DIRECTION GENMASK(1) 93 94 /* AUX channel interface registers */ 95 #define ZYNQMP_DP_AUX_COMMAND 0x100 96 #define ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT 8 97 #define ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY BIT(12) 98 #define ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT 0 99 #define ZYNQMP_DP_AUX_WRITE_FIFO 0x104 100 #define ZYNQMP_DP_AUX_ADDRESS 0x108 101 #define ZYNQMP_DP_AUX_CLK_DIVIDER 0x10c 102 #define ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT 8 103 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE 0x130 104 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD BIT(0) 105 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST BIT(1) 106 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY BIT(2) 107 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT BIT(3) 108 #define ZYNQMP_DP_AUX_REPLY_DATA 0x134 109 #define ZYNQMP_DP_AUX_REPLY_CODE 0x138 110 #define ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK (0) 111 #define ZYNQMP_DP_AUX_REPLY_CODE_AUX_NACK BIT(0) 112 #define ZYNQMP_DP_AUX_REPLY_CODE_AUX_DEFER BIT(1) 113 #define ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK (0) 114 #define ZYNQMP_DP_AUX_REPLY_CODE_I2C_NACK BIT(2) 115 #define ZYNQMP_DP_AUX_REPLY_CODE_I2C_DEFER BIT(3) 116 #define ZYNQMP_DP_AUX_REPLY_COUNT 0x13c 117 #define ZYNQMP_DP_REPLY_DATA_COUNT 0x148 118 #define ZYNQMP_DP_REPLY_DATA_COUNT_MASK 0xff 119 #define ZYNQMP_DP_INT_STATUS 0x3a0 120 #define ZYNQMP_DP_INT_MASK 0x3a4 121 #define ZYNQMP_DP_INT_EN 0x3a8 122 #define ZYNQMP_DP_INT_DS 0x3ac 123 #define ZYNQMP_DP_INT_HPD_IRQ BIT(0) 124 #define ZYNQMP_DP_INT_HPD_EVENT BIT(1) 125 #define ZYNQMP_DP_INT_REPLY_RECEIVED BIT(2) 126 #define ZYNQMP_DP_INT_REPLY_TIMEOUT BIT(3) 127 #define ZYNQMP_DP_INT_HPD_PULSE_DET BIT(4) 128 #define ZYNQMP_DP_INT_EXT_PKT_TXD BIT(5) 129 #define ZYNQMP_DP_INT_LIV_ABUF_UNDRFLW BIT(12) 130 #define ZYNQMP_DP_INT_VBLANK_START BIT(13) 131 #define ZYNQMP_DP_INT_PIXEL1_MATCH BIT(14) 132 #define ZYNQMP_DP_INT_PIXEL0_MATCH BIT(15) 133 #define ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK 0x3f0000 134 #define ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK 0xfc00000 135 #define ZYNQMP_DP_INT_CUST_TS_2 BIT(28) 136 #define ZYNQMP_DP_INT_CUST_TS BIT(29) 137 #define ZYNQMP_DP_INT_EXT_VSYNC_TS BIT(30) 138 #define ZYNQMP_DP_INT_VSYNC_TS BIT(31) 139 #define ZYNQMP_DP_INT_ALL (ZYNQMP_DP_INT_HPD_IRQ | \ 140 ZYNQMP_DP_INT_HPD_EVENT | \ 141 ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK | \ 142 ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK) 143 144 /* Main stream attribute registers */ 145 #define ZYNQMP_DP_MAIN_STREAM_HTOTAL 0x180 146 #define ZYNQMP_DP_MAIN_STREAM_VTOTAL 0x184 147 #define ZYNQMP_DP_MAIN_STREAM_POLARITY 0x188 148 #define ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT 0 149 #define ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT 1 150 #define ZYNQMP_DP_MAIN_STREAM_HSWIDTH 0x18c 151 #define ZYNQMP_DP_MAIN_STREAM_VSWIDTH 0x190 152 #define ZYNQMP_DP_MAIN_STREAM_HRES 0x194 153 #define ZYNQMP_DP_MAIN_STREAM_VRES 0x198 154 #define ZYNQMP_DP_MAIN_STREAM_HSTART 0x19c 155 #define ZYNQMP_DP_MAIN_STREAM_VSTART 0x1a0 156 #define ZYNQMP_DP_MAIN_STREAM_MISC0 0x1a4 157 #define ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK BIT(0) 158 #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB (0 << 1) 159 #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422 (5 << 1) 160 #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444 (6 << 1) 161 #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK (7 << 1) 162 #define ZYNQMP_DP_MAIN_STREAM_MISC0_DYNAMIC_RANGE BIT(3) 163 #define ZYNQMP_DP_MAIN_STREAM_MISC0_YCBCR_COLR BIT(4) 164 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6 (0 << 5) 165 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8 (1 << 5) 166 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10 (2 << 5) 167 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12 (3 << 5) 168 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16 (4 << 5) 169 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK (7 << 5) 170 #define ZYNQMP_DP_MAIN_STREAM_MISC1 0x1a8 171 #define ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN BIT(7) 172 #define ZYNQMP_DP_MAIN_STREAM_M_VID 0x1ac 173 #define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE 0x1b0 174 #define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF 64 175 #define ZYNQMP_DP_MAIN_STREAM_N_VID 0x1b4 176 #define ZYNQMP_DP_USER_PIX_WIDTH 0x1b8 177 #define ZYNQMP_DP_USER_DATA_COUNT_PER_LANE 0x1bc 178 #define ZYNQMP_DP_MIN_BYTES_PER_TU 0x1c4 179 #define ZYNQMP_DP_FRAC_BYTES_PER_TU 0x1c8 180 #define ZYNQMP_DP_INIT_WAIT 0x1cc 181 182 /* PHY configuration and status registers */ 183 #define ZYNQMP_DP_PHY_RESET 0x200 184 #define ZYNQMP_DP_PHY_RESET_PHY_RESET BIT(0) 185 #define ZYNQMP_DP_PHY_RESET_GTTX_RESET BIT(1) 186 #define ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET BIT(8) 187 #define ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET BIT(9) 188 #define ZYNQMP_DP_PHY_RESET_ALL_RESET (ZYNQMP_DP_PHY_RESET_PHY_RESET | \ 189 ZYNQMP_DP_PHY_RESET_GTTX_RESET | \ 190 ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET | \ 191 ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET) 192 #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_0 0x210 193 #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_1 0x214 194 #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_2 0x218 195 #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_3 0x21c 196 #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_0 0x220 197 #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_1 0x224 198 #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_2 0x228 199 #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_3 0x22c 200 #define ZYNQMP_DP_PHY_CLOCK_SELECT 0x234 201 #define ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G 0x1 202 #define ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G 0x3 203 #define ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G 0x5 204 #define ZYNQMP_DP_TX_PHY_POWER_DOWN 0x238 205 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_0 BIT(0) 206 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_1 BIT(1) 207 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_2 BIT(2) 208 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_3 BIT(3) 209 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL 0xf 210 #define ZYNQMP_DP_PHY_PRECURSOR_LANE_0 0x23c 211 #define ZYNQMP_DP_PHY_PRECURSOR_LANE_1 0x240 212 #define ZYNQMP_DP_PHY_PRECURSOR_LANE_2 0x244 213 #define ZYNQMP_DP_PHY_PRECURSOR_LANE_3 0x248 214 #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_0 0x24c 215 #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_1 0x250 216 #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_2 0x254 217 #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_3 0x258 218 #define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 0x24c 219 #define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_1 0x250 220 #define ZYNQMP_DP_PHY_STATUS 0x280 221 #define ZYNQMP_DP_PHY_STATUS_PLL_LOCKED_SHIFT 4 222 #define ZYNQMP_DP_PHY_STATUS_FPGA_PLL_LOCKED BIT(6) 223 224 /* Audio registers */ 225 #define ZYNQMP_DP_TX_AUDIO_CONTROL 0x300 226 #define ZYNQMP_DP_TX_AUDIO_CHANNELS 0x304 227 #define ZYNQMP_DP_TX_AUDIO_INFO_DATA 0x308 228 #define ZYNQMP_DP_TX_M_AUD 0x328 229 #define ZYNQMP_DP_TX_N_AUD 0x32c 230 #define ZYNQMP_DP_TX_AUDIO_EXT_DATA 0x330 231 232 #define ZYNQMP_DP_MAX_LANES 2 233 #define ZYNQMP_MAX_FREQ 3000000 234 235 #define DP_REDUCED_BIT_RATE 162000 236 #define DP_HIGH_BIT_RATE 270000 237 #define DP_HIGH_BIT_RATE2 540000 238 #define DP_MAX_TRAINING_TRIES 5 239 #define DP_V1_2 0x12 240 241 /** 242 * struct zynqmp_dp_link_config - Common link config between source and sink 243 * @max_rate: maximum link rate 244 * @max_lanes: maximum number of lanes 245 */ 246 struct zynqmp_dp_link_config { 247 int max_rate; 248 u8 max_lanes; 249 }; 250 251 /** 252 * struct zynqmp_dp_mode - Configured mode of DisplayPort 253 * @bw_code: code for bandwidth(link rate) 254 * @lane_cnt: number of lanes 255 * @pclock: pixel clock frequency of current mode 256 * @fmt: format identifier string 257 */ 258 struct zynqmp_dp_mode { 259 u8 bw_code; 260 u8 lane_cnt; 261 int pclock; 262 const char *fmt; 263 }; 264 265 /** 266 * struct zynqmp_dp_config - Configuration of DisplayPort from DTS 267 * @misc0: misc0 configuration (per DP v1.2 spec) 268 * @misc1: misc1 configuration (per DP v1.2 spec) 269 * @bpp: bits per pixel 270 */ 271 struct zynqmp_dp_config { 272 u8 misc0; 273 u8 misc1; 274 u8 bpp; 275 }; 276 277 /** 278 * struct zynqmp_dp - Xilinx DisplayPort core 279 * @encoder: the drm encoder structure 280 * @connector: the drm connector structure 281 * @dev: device structure 282 * @dpsub: Display subsystem 283 * @drm: DRM core 284 * @iomem: device I/O memory for register access 285 * @reset: reset controller 286 * @irq: irq 287 * @config: IP core configuration from DTS 288 * @aux: aux channel 289 * @phy: PHY handles for DP lanes 290 * @num_lanes: number of enabled phy lanes 291 * @hpd_work: hot plug detection worker 292 * @status: connection status 293 * @enabled: flag to indicate if the device is enabled 294 * @dpcd: DP configuration data from currently connected sink device 295 * @link_config: common link configuration between IP core and sink device 296 * @mode: current mode between IP core and sink device 297 * @train_set: set of training data 298 */ 299 struct zynqmp_dp { 300 struct drm_encoder encoder; 301 struct drm_connector connector; 302 struct device *dev; 303 struct zynqmp_dpsub *dpsub; 304 struct drm_device *drm; 305 void __iomem *iomem; 306 struct reset_control *reset; 307 int irq; 308 309 struct zynqmp_dp_config config; 310 struct drm_dp_aux aux; 311 struct phy *phy[ZYNQMP_DP_MAX_LANES]; 312 u8 num_lanes; 313 struct delayed_work hpd_work; 314 enum drm_connector_status status; 315 bool enabled; 316 317 u8 dpcd[DP_RECEIVER_CAP_SIZE]; 318 struct zynqmp_dp_link_config link_config; 319 struct zynqmp_dp_mode mode; 320 u8 train_set[ZYNQMP_DP_MAX_LANES]; 321 }; 322 323 static inline struct zynqmp_dp *encoder_to_dp(struct drm_encoder *encoder) 324 { 325 return container_of(encoder, struct zynqmp_dp, encoder); 326 } 327 328 static inline struct zynqmp_dp *connector_to_dp(struct drm_connector *connector) 329 { 330 return container_of(connector, struct zynqmp_dp, connector); 331 } 332 333 static void zynqmp_dp_write(struct zynqmp_dp *dp, int offset, u32 val) 334 { 335 writel(val, dp->iomem + offset); 336 } 337 338 static u32 zynqmp_dp_read(struct zynqmp_dp *dp, int offset) 339 { 340 return readl(dp->iomem + offset); 341 } 342 343 static void zynqmp_dp_clr(struct zynqmp_dp *dp, int offset, u32 clr) 344 { 345 zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) & ~clr); 346 } 347 348 static void zynqmp_dp_set(struct zynqmp_dp *dp, int offset, u32 set) 349 { 350 zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) | set); 351 } 352 353 /* ----------------------------------------------------------------------------- 354 * PHY Handling 355 */ 356 357 #define RST_TIMEOUT_MS 1000 358 359 static int zynqmp_dp_reset(struct zynqmp_dp *dp, bool assert) 360 { 361 unsigned long timeout; 362 363 if (assert) 364 reset_control_assert(dp->reset); 365 else 366 reset_control_deassert(dp->reset); 367 368 /* Wait for the (de)assert to complete. */ 369 timeout = jiffies + msecs_to_jiffies(RST_TIMEOUT_MS); 370 while (!time_after_eq(jiffies, timeout)) { 371 bool status = !!reset_control_status(dp->reset); 372 373 if (assert == status) 374 return 0; 375 376 cpu_relax(); 377 } 378 379 dev_err(dp->dev, "reset %s timeout\n", assert ? "assert" : "deassert"); 380 return -ETIMEDOUT; 381 } 382 383 /** 384 * zynqmp_dp_phy_init - Initialize the phy 385 * @dp: DisplayPort IP core structure 386 * 387 * Initialize the phy. 388 * 389 * Return: 0 if the phy instances are initialized correctly, or the error code 390 * returned from the callee functions. 391 */ 392 static int zynqmp_dp_phy_init(struct zynqmp_dp *dp) 393 { 394 int ret; 395 int i; 396 397 for (i = 0; i < dp->num_lanes; i++) { 398 ret = phy_init(dp->phy[i]); 399 if (ret) { 400 dev_err(dp->dev, "failed to init phy lane %d\n", i); 401 return ret; 402 } 403 } 404 405 ret = zynqmp_dp_reset(dp, false); 406 if (ret < 0) 407 return ret; 408 409 zynqmp_dp_clr(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET); 410 411 /* 412 * Power on lanes in reverse order as only lane 0 waits for the PLL to 413 * lock. 414 */ 415 for (i = dp->num_lanes - 1; i >= 0; i--) { 416 ret = phy_power_on(dp->phy[i]); 417 if (ret) { 418 dev_err(dp->dev, "failed to power on phy lane %d\n", i); 419 return ret; 420 } 421 } 422 423 return 0; 424 } 425 426 /** 427 * zynqmp_dp_phy_exit - Exit the phy 428 * @dp: DisplayPort IP core structure 429 * 430 * Exit the phy. 431 */ 432 static void zynqmp_dp_phy_exit(struct zynqmp_dp *dp) 433 { 434 unsigned int i; 435 int ret; 436 437 for (i = 0; i < dp->num_lanes; i++) { 438 ret = phy_power_off(dp->phy[i]); 439 if (ret) 440 dev_err(dp->dev, "failed to power off phy(%d) %d\n", i, 441 ret); 442 } 443 444 zynqmp_dp_reset(dp, true); 445 446 for (i = 0; i < dp->num_lanes; i++) { 447 ret = phy_exit(dp->phy[i]); 448 if (ret) 449 dev_err(dp->dev, "failed to exit phy(%d) %d\n", i, ret); 450 } 451 } 452 453 /** 454 * zynqmp_dp_phy_probe - Probe the PHYs 455 * @dp: DisplayPort IP core structure 456 * 457 * Probe PHYs for all lanes. Less PHYs may be available than the number of 458 * lanes, which is not considered an error as long as at least one PHY is 459 * found. The caller can check dp->num_lanes to check how many PHYs were found. 460 * 461 * Return: 462 * * 0 - Success 463 * * -ENXIO - No PHY found 464 * * -EPROBE_DEFER - Probe deferral requested 465 * * Other negative value - PHY retrieval failure 466 */ 467 static int zynqmp_dp_phy_probe(struct zynqmp_dp *dp) 468 { 469 unsigned int i; 470 471 for (i = 0; i < ZYNQMP_DP_MAX_LANES; i++) { 472 char phy_name[16]; 473 struct phy *phy; 474 475 snprintf(phy_name, sizeof(phy_name), "dp-phy%d", i); 476 phy = devm_phy_get(dp->dev, phy_name); 477 478 if (IS_ERR(phy)) { 479 switch (PTR_ERR(phy)) { 480 case -ENODEV: 481 if (dp->num_lanes) 482 return 0; 483 484 dev_err(dp->dev, "no PHY found\n"); 485 return -ENXIO; 486 487 case -EPROBE_DEFER: 488 return -EPROBE_DEFER; 489 490 default: 491 dev_err(dp->dev, "failed to get PHY lane %u\n", 492 i); 493 return PTR_ERR(phy); 494 } 495 } 496 497 dp->phy[i] = phy; 498 dp->num_lanes++; 499 } 500 501 return 0; 502 } 503 504 /** 505 * zynqmp_dp_phy_ready - Check if PHY is ready 506 * @dp: DisplayPort IP core structure 507 * 508 * Check if PHY is ready. If PHY is not ready, wait 1ms to check for 100 times. 509 * This amount of delay was suggested by IP designer. 510 * 511 * Return: 0 if PHY is ready, or -ENODEV if PHY is not ready. 512 */ 513 static int zynqmp_dp_phy_ready(struct zynqmp_dp *dp) 514 { 515 u32 i, reg, ready; 516 517 ready = (1 << dp->num_lanes) - 1; 518 519 /* Wait for 100 * 1ms. This should be enough time for PHY to be ready */ 520 for (i = 0; ; i++) { 521 reg = zynqmp_dp_read(dp, ZYNQMP_DP_PHY_STATUS); 522 if ((reg & ready) == ready) 523 return 0; 524 525 if (i == 100) { 526 dev_err(dp->dev, "PHY isn't ready\n"); 527 return -ENODEV; 528 } 529 530 usleep_range(1000, 1100); 531 } 532 533 return 0; 534 } 535 536 /* ----------------------------------------------------------------------------- 537 * DisplayPort Link Training 538 */ 539 540 /** 541 * zynqmp_dp_max_rate - Calculate and return available max pixel clock 542 * @link_rate: link rate (Kilo-bytes / sec) 543 * @lane_num: number of lanes 544 * @bpp: bits per pixel 545 * 546 * Return: max pixel clock (KHz) supported by current link config. 547 */ 548 static inline int zynqmp_dp_max_rate(int link_rate, u8 lane_num, u8 bpp) 549 { 550 return link_rate * lane_num * 8 / bpp; 551 } 552 553 /** 554 * zynqmp_dp_mode_configure - Configure the link values 555 * @dp: DisplayPort IP core structure 556 * @pclock: pixel clock for requested display mode 557 * @current_bw: current link rate 558 * 559 * Find the link configuration values, rate and lane count for requested pixel 560 * clock @pclock. The @pclock is stored in the mode to be used in other 561 * functions later. The returned rate is downshifted from the current rate 562 * @current_bw. 563 * 564 * Return: Current link rate code, or -EINVAL. 565 */ 566 static int zynqmp_dp_mode_configure(struct zynqmp_dp *dp, int pclock, 567 u8 current_bw) 568 { 569 int max_rate = dp->link_config.max_rate; 570 u8 bw_code; 571 u8 max_lanes = dp->link_config.max_lanes; 572 u8 max_link_rate_code = drm_dp_link_rate_to_bw_code(max_rate); 573 u8 bpp = dp->config.bpp; 574 u8 lane_cnt; 575 576 /* Downshift from current bandwidth */ 577 switch (current_bw) { 578 case DP_LINK_BW_5_4: 579 bw_code = DP_LINK_BW_2_7; 580 break; 581 case DP_LINK_BW_2_7: 582 bw_code = DP_LINK_BW_1_62; 583 break; 584 case DP_LINK_BW_1_62: 585 dev_err(dp->dev, "can't downshift. already lowest link rate\n"); 586 return -EINVAL; 587 default: 588 /* If not given, start with max supported */ 589 bw_code = max_link_rate_code; 590 break; 591 } 592 593 for (lane_cnt = 1; lane_cnt <= max_lanes; lane_cnt <<= 1) { 594 int bw; 595 u32 rate; 596 597 bw = drm_dp_bw_code_to_link_rate(bw_code); 598 rate = zynqmp_dp_max_rate(bw, lane_cnt, bpp); 599 if (pclock <= rate) { 600 dp->mode.bw_code = bw_code; 601 dp->mode.lane_cnt = lane_cnt; 602 dp->mode.pclock = pclock; 603 return dp->mode.bw_code; 604 } 605 } 606 607 dev_err(dp->dev, "failed to configure link values\n"); 608 609 return -EINVAL; 610 } 611 612 /** 613 * zynqmp_dp_adjust_train - Adjust train values 614 * @dp: DisplayPort IP core structure 615 * @link_status: link status from sink which contains requested training values 616 */ 617 static void zynqmp_dp_adjust_train(struct zynqmp_dp *dp, 618 u8 link_status[DP_LINK_STATUS_SIZE]) 619 { 620 u8 *train_set = dp->train_set; 621 u8 voltage = 0, preemphasis = 0; 622 u8 i; 623 624 for (i = 0; i < dp->mode.lane_cnt; i++) { 625 u8 v = drm_dp_get_adjust_request_voltage(link_status, i); 626 u8 p = drm_dp_get_adjust_request_pre_emphasis(link_status, i); 627 628 if (v > voltage) 629 voltage = v; 630 631 if (p > preemphasis) 632 preemphasis = p; 633 } 634 635 if (voltage >= DP_TRAIN_VOLTAGE_SWING_LEVEL_3) 636 voltage |= DP_TRAIN_MAX_SWING_REACHED; 637 638 if (preemphasis >= DP_TRAIN_PRE_EMPH_LEVEL_2) 639 preemphasis |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; 640 641 for (i = 0; i < dp->mode.lane_cnt; i++) 642 train_set[i] = voltage | preemphasis; 643 } 644 645 /** 646 * zynqmp_dp_update_vs_emph - Update the training values 647 * @dp: DisplayPort IP core structure 648 * 649 * Update the training values based on the request from sink. The mapped values 650 * are predefined, and values(vs, pe, pc) are from the device manual. 651 * 652 * Return: 0 if vs and emph are updated successfully, or the error code returned 653 * by drm_dp_dpcd_write(). 654 */ 655 static int zynqmp_dp_update_vs_emph(struct zynqmp_dp *dp) 656 { 657 unsigned int i; 658 int ret; 659 660 ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, dp->train_set, 661 dp->mode.lane_cnt); 662 if (ret < 0) 663 return ret; 664 665 for (i = 0; i < dp->mode.lane_cnt; i++) { 666 u32 reg = ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 + i * 4; 667 union phy_configure_opts opts = { 0 }; 668 u8 train = dp->train_set[i]; 669 670 opts.dp.voltage[0] = (train & DP_TRAIN_VOLTAGE_SWING_MASK) 671 >> DP_TRAIN_VOLTAGE_SWING_SHIFT; 672 opts.dp.pre[0] = (train & DP_TRAIN_PRE_EMPHASIS_MASK) 673 >> DP_TRAIN_PRE_EMPHASIS_SHIFT; 674 675 phy_configure(dp->phy[i], &opts); 676 677 zynqmp_dp_write(dp, reg, 0x2); 678 } 679 680 return 0; 681 } 682 683 /** 684 * zynqmp_dp_link_train_cr - Train clock recovery 685 * @dp: DisplayPort IP core structure 686 * 687 * Return: 0 if clock recovery train is done successfully, or corresponding 688 * error code. 689 */ 690 static int zynqmp_dp_link_train_cr(struct zynqmp_dp *dp) 691 { 692 u8 link_status[DP_LINK_STATUS_SIZE]; 693 u8 lane_cnt = dp->mode.lane_cnt; 694 u8 vs = 0, tries = 0; 695 u16 max_tries, i; 696 bool cr_done; 697 int ret; 698 699 zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, 700 DP_TRAINING_PATTERN_1); 701 ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, 702 DP_TRAINING_PATTERN_1 | 703 DP_LINK_SCRAMBLING_DISABLE); 704 if (ret < 0) 705 return ret; 706 707 /* 708 * 256 loops should be maximum iterations for 4 lanes and 4 values. 709 * So, This loop should exit before 512 iterations 710 */ 711 for (max_tries = 0; max_tries < 512; max_tries++) { 712 ret = zynqmp_dp_update_vs_emph(dp); 713 if (ret) 714 return ret; 715 716 drm_dp_link_train_clock_recovery_delay(&dp->aux, dp->dpcd); 717 ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status); 718 if (ret < 0) 719 return ret; 720 721 cr_done = drm_dp_clock_recovery_ok(link_status, lane_cnt); 722 if (cr_done) 723 break; 724 725 for (i = 0; i < lane_cnt; i++) 726 if (!(dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED)) 727 break; 728 if (i == lane_cnt) 729 break; 730 731 if ((dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == vs) 732 tries++; 733 else 734 tries = 0; 735 736 if (tries == DP_MAX_TRAINING_TRIES) 737 break; 738 739 vs = dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK; 740 zynqmp_dp_adjust_train(dp, link_status); 741 } 742 743 if (!cr_done) 744 return -EIO; 745 746 return 0; 747 } 748 749 /** 750 * zynqmp_dp_link_train_ce - Train channel equalization 751 * @dp: DisplayPort IP core structure 752 * 753 * Return: 0 if channel equalization train is done successfully, or 754 * corresponding error code. 755 */ 756 static int zynqmp_dp_link_train_ce(struct zynqmp_dp *dp) 757 { 758 u8 link_status[DP_LINK_STATUS_SIZE]; 759 u8 lane_cnt = dp->mode.lane_cnt; 760 u32 pat, tries; 761 int ret; 762 bool ce_done; 763 764 if (dp->dpcd[DP_DPCD_REV] >= DP_V1_2 && 765 dp->dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED) 766 pat = DP_TRAINING_PATTERN_3; 767 else 768 pat = DP_TRAINING_PATTERN_2; 769 770 zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, pat); 771 ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, 772 pat | DP_LINK_SCRAMBLING_DISABLE); 773 if (ret < 0) 774 return ret; 775 776 for (tries = 0; tries < DP_MAX_TRAINING_TRIES; tries++) { 777 ret = zynqmp_dp_update_vs_emph(dp); 778 if (ret) 779 return ret; 780 781 drm_dp_link_train_channel_eq_delay(&dp->aux, dp->dpcd); 782 ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status); 783 if (ret < 0) 784 return ret; 785 786 ce_done = drm_dp_channel_eq_ok(link_status, lane_cnt); 787 if (ce_done) 788 break; 789 790 zynqmp_dp_adjust_train(dp, link_status); 791 } 792 793 if (!ce_done) 794 return -EIO; 795 796 return 0; 797 } 798 799 /** 800 * zynqmp_dp_link_train - Train the link 801 * @dp: DisplayPort IP core structure 802 * 803 * Return: 0 if all trains are done successfully, or corresponding error code. 804 */ 805 static int zynqmp_dp_train(struct zynqmp_dp *dp) 806 { 807 u32 reg; 808 u8 bw_code = dp->mode.bw_code; 809 u8 lane_cnt = dp->mode.lane_cnt; 810 u8 aux_lane_cnt = lane_cnt; 811 bool enhanced; 812 int ret; 813 814 zynqmp_dp_write(dp, ZYNQMP_DP_LANE_COUNT_SET, lane_cnt); 815 enhanced = drm_dp_enhanced_frame_cap(dp->dpcd); 816 if (enhanced) { 817 zynqmp_dp_write(dp, ZYNQMP_DP_ENHANCED_FRAME_EN, 1); 818 aux_lane_cnt |= DP_LANE_COUNT_ENHANCED_FRAME_EN; 819 } 820 821 if (dp->dpcd[3] & 0x1) { 822 zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 1); 823 drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, 824 DP_SPREAD_AMP_0_5); 825 } else { 826 zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 0); 827 drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, 0); 828 } 829 830 ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, aux_lane_cnt); 831 if (ret < 0) { 832 dev_err(dp->dev, "failed to set lane count\n"); 833 return ret; 834 } 835 836 ret = drm_dp_dpcd_writeb(&dp->aux, DP_MAIN_LINK_CHANNEL_CODING_SET, 837 DP_SET_ANSI_8B10B); 838 if (ret < 0) { 839 dev_err(dp->dev, "failed to set ANSI 8B/10B encoding\n"); 840 return ret; 841 } 842 843 ret = drm_dp_dpcd_writeb(&dp->aux, DP_LINK_BW_SET, bw_code); 844 if (ret < 0) { 845 dev_err(dp->dev, "failed to set DP bandwidth\n"); 846 return ret; 847 } 848 849 zynqmp_dp_write(dp, ZYNQMP_DP_LINK_BW_SET, bw_code); 850 switch (bw_code) { 851 case DP_LINK_BW_1_62: 852 reg = ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G; 853 break; 854 case DP_LINK_BW_2_7: 855 reg = ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G; 856 break; 857 case DP_LINK_BW_5_4: 858 default: 859 reg = ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G; 860 break; 861 } 862 863 zynqmp_dp_write(dp, ZYNQMP_DP_PHY_CLOCK_SELECT, reg); 864 ret = zynqmp_dp_phy_ready(dp); 865 if (ret < 0) 866 return ret; 867 868 zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 1); 869 memset(dp->train_set, 0, sizeof(dp->train_set)); 870 ret = zynqmp_dp_link_train_cr(dp); 871 if (ret) 872 return ret; 873 874 ret = zynqmp_dp_link_train_ce(dp); 875 if (ret) 876 return ret; 877 878 ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, 879 DP_TRAINING_PATTERN_DISABLE); 880 if (ret < 0) { 881 dev_err(dp->dev, "failed to disable training pattern\n"); 882 return ret; 883 } 884 zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, 885 DP_TRAINING_PATTERN_DISABLE); 886 887 zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 0); 888 889 return 0; 890 } 891 892 /** 893 * zynqmp_dp_train_loop - Downshift the link rate during training 894 * @dp: DisplayPort IP core structure 895 * 896 * Train the link by downshifting the link rate if training is not successful. 897 */ 898 static void zynqmp_dp_train_loop(struct zynqmp_dp *dp) 899 { 900 struct zynqmp_dp_mode *mode = &dp->mode; 901 u8 bw = mode->bw_code; 902 int ret; 903 904 do { 905 if (dp->status == connector_status_disconnected || 906 !dp->enabled) 907 return; 908 909 ret = zynqmp_dp_train(dp); 910 if (!ret) 911 return; 912 913 ret = zynqmp_dp_mode_configure(dp, mode->pclock, bw); 914 if (ret < 0) 915 goto err_out; 916 917 bw = ret; 918 } while (bw >= DP_LINK_BW_1_62); 919 920 err_out: 921 dev_err(dp->dev, "failed to train the DP link\n"); 922 } 923 924 /* ----------------------------------------------------------------------------- 925 * DisplayPort AUX 926 */ 927 928 #define AUX_READ_BIT 0x1 929 930 /** 931 * zynqmp_dp_aux_cmd_submit - Submit aux command 932 * @dp: DisplayPort IP core structure 933 * @cmd: aux command 934 * @addr: aux address 935 * @buf: buffer for command data 936 * @bytes: number of bytes for @buf 937 * @reply: reply code to be returned 938 * 939 * Submit an aux command. All aux related commands, native or i2c aux 940 * read/write, are submitted through this function. The function is mapped to 941 * the transfer function of struct drm_dp_aux. This function involves in 942 * multiple register reads/writes, thus synchronization is needed, and it is 943 * done by drm_dp_helper using @hw_mutex. The calling thread goes into sleep 944 * if there's no immediate reply to the command submission. The reply code is 945 * returned at @reply if @reply != NULL. 946 * 947 * Return: 0 if the command is submitted properly, or corresponding error code: 948 * -EBUSY when there is any request already being processed 949 * -ETIMEDOUT when receiving reply is timed out 950 * -EIO when received bytes are less than requested 951 */ 952 static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp *dp, u32 cmd, u16 addr, 953 u8 *buf, u8 bytes, u8 *reply) 954 { 955 bool is_read = (cmd & AUX_READ_BIT) ? true : false; 956 u32 reg, i; 957 958 reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); 959 if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST) 960 return -EBUSY; 961 962 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_ADDRESS, addr); 963 if (!is_read) 964 for (i = 0; i < bytes; i++) 965 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_WRITE_FIFO, 966 buf[i]); 967 968 reg = cmd << ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT; 969 if (!buf || !bytes) 970 reg |= ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY; 971 else 972 reg |= (bytes - 1) << ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT; 973 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_COMMAND, reg); 974 975 /* Wait for reply to be delivered upto 2ms */ 976 for (i = 0; ; i++) { 977 reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); 978 if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY) 979 break; 980 981 if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT || 982 i == 2) 983 return -ETIMEDOUT; 984 985 usleep_range(1000, 1100); 986 } 987 988 reg = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_CODE); 989 if (reply) 990 *reply = reg; 991 992 if (is_read && 993 (reg == ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK || 994 reg == ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK)) { 995 reg = zynqmp_dp_read(dp, ZYNQMP_DP_REPLY_DATA_COUNT); 996 if ((reg & ZYNQMP_DP_REPLY_DATA_COUNT_MASK) != bytes) 997 return -EIO; 998 999 for (i = 0; i < bytes; i++) 1000 buf[i] = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_DATA); 1001 } 1002 1003 return 0; 1004 } 1005 1006 static ssize_t 1007 zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) 1008 { 1009 struct zynqmp_dp *dp = container_of(aux, struct zynqmp_dp, aux); 1010 int ret; 1011 unsigned int i, iter; 1012 1013 /* Number of loops = timeout in msec / aux delay (400 usec) */ 1014 iter = zynqmp_dp_aux_timeout_ms * 1000 / 400; 1015 iter = iter ? iter : 1; 1016 1017 for (i = 0; i < iter; i++) { 1018 ret = zynqmp_dp_aux_cmd_submit(dp, msg->request, msg->address, 1019 msg->buffer, msg->size, 1020 &msg->reply); 1021 if (!ret) { 1022 dev_dbg(dp->dev, "aux %d retries\n", i); 1023 return msg->size; 1024 } 1025 1026 if (dp->status == connector_status_disconnected) { 1027 dev_dbg(dp->dev, "no connected aux device\n"); 1028 return -ENODEV; 1029 } 1030 1031 usleep_range(400, 500); 1032 } 1033 1034 dev_dbg(dp->dev, "failed to do aux transfer (%d)\n", ret); 1035 1036 return ret; 1037 } 1038 1039 /** 1040 * zynqmp_dp_aux_init - Initialize and register the DP AUX 1041 * @dp: DisplayPort IP core structure 1042 * 1043 * Program the AUX clock divider and filter and register the DP AUX adapter. 1044 * 1045 * Return: 0 on success, error value otherwise 1046 */ 1047 static int zynqmp_dp_aux_init(struct zynqmp_dp *dp) 1048 { 1049 unsigned long rate; 1050 unsigned int w; 1051 1052 /* 1053 * The AUX_SIGNAL_WIDTH_FILTER is the number of APB clock cycles 1054 * corresponding to the AUX pulse. Allowable values are 8, 16, 24, 32, 1055 * 40 and 48. The AUX pulse width must be between 0.4µs and 0.6µs, 1056 * compute the w / 8 value corresponding to 0.4µs rounded up, and make 1057 * sure it stays below 0.6µs and within the allowable values. 1058 */ 1059 rate = clk_get_rate(dp->dpsub->apb_clk); 1060 w = DIV_ROUND_UP(4 * rate, 1000 * 1000 * 10 * 8) * 8; 1061 if (w > 6 * rate / (1000 * 1000 * 10) || w > 48) { 1062 dev_err(dp->dev, "aclk frequency too high\n"); 1063 return -EINVAL; 1064 } 1065 1066 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_CLK_DIVIDER, 1067 (w << ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT) | 1068 (rate / (1000 * 1000))); 1069 1070 dp->aux.name = "ZynqMP DP AUX"; 1071 dp->aux.dev = dp->dev; 1072 dp->aux.drm_dev = dp->drm; 1073 dp->aux.transfer = zynqmp_dp_aux_transfer; 1074 1075 return drm_dp_aux_register(&dp->aux); 1076 } 1077 1078 /** 1079 * zynqmp_dp_aux_cleanup - Cleanup the DP AUX 1080 * @dp: DisplayPort IP core structure 1081 * 1082 * Unregister the DP AUX adapter. 1083 */ 1084 static void zynqmp_dp_aux_cleanup(struct zynqmp_dp *dp) 1085 { 1086 drm_dp_aux_unregister(&dp->aux); 1087 } 1088 1089 /* ----------------------------------------------------------------------------- 1090 * DisplayPort Generic Support 1091 */ 1092 1093 /** 1094 * zynqmp_dp_update_misc - Write the misc registers 1095 * @dp: DisplayPort IP core structure 1096 * 1097 * The misc register values are stored in the structure, and this 1098 * function applies the values into the registers. 1099 */ 1100 static void zynqmp_dp_update_misc(struct zynqmp_dp *dp) 1101 { 1102 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC0, dp->config.misc0); 1103 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC1, dp->config.misc1); 1104 } 1105 1106 /** 1107 * zynqmp_dp_set_format - Set the input format 1108 * @dp: DisplayPort IP core structure 1109 * @format: input format 1110 * @bpc: bits per component 1111 * 1112 * Update misc register values based on input @format and @bpc. 1113 * 1114 * Return: 0 on success, or -EINVAL. 1115 */ 1116 static int zynqmp_dp_set_format(struct zynqmp_dp *dp, 1117 enum zynqmp_dpsub_format format, 1118 unsigned int bpc) 1119 { 1120 static const struct drm_display_info *display; 1121 struct zynqmp_dp_config *config = &dp->config; 1122 unsigned int num_colors; 1123 1124 config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK; 1125 config->misc1 &= ~ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN; 1126 1127 switch (format) { 1128 case ZYNQMP_DPSUB_FORMAT_RGB: 1129 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB; 1130 num_colors = 3; 1131 break; 1132 1133 case ZYNQMP_DPSUB_FORMAT_YCRCB444: 1134 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444; 1135 num_colors = 3; 1136 break; 1137 1138 case ZYNQMP_DPSUB_FORMAT_YCRCB422: 1139 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422; 1140 num_colors = 2; 1141 break; 1142 1143 case ZYNQMP_DPSUB_FORMAT_YONLY: 1144 config->misc1 |= ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN; 1145 num_colors = 1; 1146 break; 1147 1148 default: 1149 dev_err(dp->dev, "Invalid colormetry in DT\n"); 1150 return -EINVAL; 1151 } 1152 1153 display = &dp->connector.display_info; 1154 if (display->bpc && bpc > display->bpc) { 1155 dev_warn(dp->dev, 1156 "downgrading requested %ubpc to display limit %ubpc\n", 1157 bpc, display->bpc); 1158 bpc = display->bpc; 1159 } 1160 1161 config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK; 1162 1163 switch (bpc) { 1164 case 6: 1165 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6; 1166 break; 1167 case 8: 1168 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8; 1169 break; 1170 case 10: 1171 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10; 1172 break; 1173 case 12: 1174 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12; 1175 break; 1176 case 16: 1177 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16; 1178 break; 1179 default: 1180 dev_warn(dp->dev, "Not supported bpc (%u). fall back to 8bpc\n", 1181 bpc); 1182 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8; 1183 bpc = 8; 1184 break; 1185 } 1186 1187 /* Update the current bpp based on the format. */ 1188 config->bpp = bpc * num_colors; 1189 1190 return 0; 1191 } 1192 1193 /** 1194 * zynqmp_dp_encoder_mode_set_transfer_unit - Set the transfer unit values 1195 * @dp: DisplayPort IP core structure 1196 * @mode: requested display mode 1197 * 1198 * Set the transfer unit, and calculate all transfer unit size related values. 1199 * Calculation is based on DP and IP core specification. 1200 */ 1201 static void 1202 zynqmp_dp_encoder_mode_set_transfer_unit(struct zynqmp_dp *dp, 1203 struct drm_display_mode *mode) 1204 { 1205 u32 tu = ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF; 1206 u32 bw, vid_kbytes, avg_bytes_per_tu, init_wait; 1207 1208 /* Use the max transfer unit size (default) */ 1209 zynqmp_dp_write(dp, ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE, tu); 1210 1211 vid_kbytes = mode->clock * (dp->config.bpp / 8); 1212 bw = drm_dp_bw_code_to_link_rate(dp->mode.bw_code); 1213 avg_bytes_per_tu = vid_kbytes * tu / (dp->mode.lane_cnt * bw / 1000); 1214 zynqmp_dp_write(dp, ZYNQMP_DP_MIN_BYTES_PER_TU, 1215 avg_bytes_per_tu / 1000); 1216 zynqmp_dp_write(dp, ZYNQMP_DP_FRAC_BYTES_PER_TU, 1217 avg_bytes_per_tu % 1000); 1218 1219 /* Configure the initial wait cycle based on transfer unit size */ 1220 if (tu < (avg_bytes_per_tu / 1000)) 1221 init_wait = 0; 1222 else if ((avg_bytes_per_tu / 1000) <= 4) 1223 init_wait = tu; 1224 else 1225 init_wait = tu - avg_bytes_per_tu / 1000; 1226 1227 zynqmp_dp_write(dp, ZYNQMP_DP_INIT_WAIT, init_wait); 1228 } 1229 1230 /** 1231 * zynqmp_dp_encoder_mode_set_stream - Configure the main stream 1232 * @dp: DisplayPort IP core structure 1233 * @mode: requested display mode 1234 * 1235 * Configure the main stream based on the requested mode @mode. Calculation is 1236 * based on IP core specification. 1237 */ 1238 static void zynqmp_dp_encoder_mode_set_stream(struct zynqmp_dp *dp, 1239 const struct drm_display_mode *mode) 1240 { 1241 u8 lane_cnt = dp->mode.lane_cnt; 1242 u32 reg, wpl; 1243 unsigned int rate; 1244 1245 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HTOTAL, mode->htotal); 1246 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VTOTAL, mode->vtotal); 1247 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_POLARITY, 1248 (!!(mode->flags & DRM_MODE_FLAG_PVSYNC) << 1249 ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT) | 1250 (!!(mode->flags & DRM_MODE_FLAG_PHSYNC) << 1251 ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT)); 1252 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSWIDTH, 1253 mode->hsync_end - mode->hsync_start); 1254 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSWIDTH, 1255 mode->vsync_end - mode->vsync_start); 1256 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HRES, mode->hdisplay); 1257 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VRES, mode->vdisplay); 1258 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSTART, 1259 mode->htotal - mode->hsync_start); 1260 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSTART, 1261 mode->vtotal - mode->vsync_start); 1262 1263 /* In synchronous mode, set the diviers */ 1264 if (dp->config.misc0 & ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK) { 1265 reg = drm_dp_bw_code_to_link_rate(dp->mode.bw_code); 1266 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_N_VID, reg); 1267 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_M_VID, mode->clock); 1268 rate = zynqmp_disp_get_audio_clk_rate(dp->dpsub->disp); 1269 if (rate) { 1270 dev_dbg(dp->dev, "Audio rate: %d\n", rate / 512); 1271 zynqmp_dp_write(dp, ZYNQMP_DP_TX_N_AUD, reg); 1272 zynqmp_dp_write(dp, ZYNQMP_DP_TX_M_AUD, rate / 1000); 1273 } 1274 } 1275 1276 /* Only 2 channel audio is supported now */ 1277 if (zynqmp_disp_audio_enabled(dp->dpsub->disp)) 1278 zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CHANNELS, 1); 1279 1280 zynqmp_dp_write(dp, ZYNQMP_DP_USER_PIX_WIDTH, 1); 1281 1282 /* Translate to the native 16 bit datapath based on IP core spec */ 1283 wpl = (mode->hdisplay * dp->config.bpp + 15) / 16; 1284 reg = wpl + wpl % lane_cnt - lane_cnt; 1285 zynqmp_dp_write(dp, ZYNQMP_DP_USER_DATA_COUNT_PER_LANE, reg); 1286 } 1287 1288 /* ----------------------------------------------------------------------------- 1289 * DRM Connector 1290 */ 1291 1292 static enum drm_connector_status 1293 zynqmp_dp_connector_detect(struct drm_connector *connector, bool force) 1294 { 1295 struct zynqmp_dp *dp = connector_to_dp(connector); 1296 struct zynqmp_dp_link_config *link_config = &dp->link_config; 1297 u32 state, i; 1298 int ret; 1299 1300 /* 1301 * This is from heuristic. It takes some delay (ex, 100 ~ 500 msec) to 1302 * get the HPD signal with some monitors. 1303 */ 1304 for (i = 0; i < 10; i++) { 1305 state = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); 1306 if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD) 1307 break; 1308 msleep(100); 1309 } 1310 1311 if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD) { 1312 ret = drm_dp_dpcd_read(&dp->aux, 0x0, dp->dpcd, 1313 sizeof(dp->dpcd)); 1314 if (ret < 0) { 1315 dev_dbg(dp->dev, "DPCD read failed"); 1316 goto disconnected; 1317 } 1318 1319 link_config->max_rate = min_t(int, 1320 drm_dp_max_link_rate(dp->dpcd), 1321 DP_HIGH_BIT_RATE2); 1322 link_config->max_lanes = min_t(u8, 1323 drm_dp_max_lane_count(dp->dpcd), 1324 dp->num_lanes); 1325 1326 dp->status = connector_status_connected; 1327 return connector_status_connected; 1328 } 1329 1330 disconnected: 1331 dp->status = connector_status_disconnected; 1332 return connector_status_disconnected; 1333 } 1334 1335 static int zynqmp_dp_connector_get_modes(struct drm_connector *connector) 1336 { 1337 struct zynqmp_dp *dp = connector_to_dp(connector); 1338 struct edid *edid; 1339 int ret; 1340 1341 edid = drm_get_edid(connector, &dp->aux.ddc); 1342 if (!edid) 1343 return 0; 1344 1345 drm_connector_update_edid_property(connector, edid); 1346 ret = drm_add_edid_modes(connector, edid); 1347 kfree(edid); 1348 1349 return ret; 1350 } 1351 1352 static struct drm_encoder * 1353 zynqmp_dp_connector_best_encoder(struct drm_connector *connector) 1354 { 1355 struct zynqmp_dp *dp = connector_to_dp(connector); 1356 1357 return &dp->encoder; 1358 } 1359 1360 static int zynqmp_dp_connector_mode_valid(struct drm_connector *connector, 1361 struct drm_display_mode *mode) 1362 { 1363 struct zynqmp_dp *dp = connector_to_dp(connector); 1364 u8 max_lanes = dp->link_config.max_lanes; 1365 u8 bpp = dp->config.bpp; 1366 int max_rate = dp->link_config.max_rate; 1367 int rate; 1368 1369 if (mode->clock > ZYNQMP_MAX_FREQ) { 1370 dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n", 1371 mode->name); 1372 drm_mode_debug_printmodeline(mode); 1373 return MODE_CLOCK_HIGH; 1374 } 1375 1376 /* Check with link rate and lane count */ 1377 rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp); 1378 if (mode->clock > rate) { 1379 dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n", 1380 mode->name); 1381 drm_mode_debug_printmodeline(mode); 1382 return MODE_CLOCK_HIGH; 1383 } 1384 1385 return MODE_OK; 1386 } 1387 1388 static const struct drm_connector_funcs zynqmp_dp_connector_funcs = { 1389 .detect = zynqmp_dp_connector_detect, 1390 .fill_modes = drm_helper_probe_single_connector_modes, 1391 .destroy = drm_connector_cleanup, 1392 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 1393 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 1394 .reset = drm_atomic_helper_connector_reset, 1395 }; 1396 1397 static const struct drm_connector_helper_funcs 1398 zynqmp_dp_connector_helper_funcs = { 1399 .get_modes = zynqmp_dp_connector_get_modes, 1400 .best_encoder = zynqmp_dp_connector_best_encoder, 1401 .mode_valid = zynqmp_dp_connector_mode_valid, 1402 }; 1403 1404 /* ----------------------------------------------------------------------------- 1405 * DRM Encoder 1406 */ 1407 1408 static void zynqmp_dp_encoder_enable(struct drm_encoder *encoder) 1409 { 1410 struct zynqmp_dp *dp = encoder_to_dp(encoder); 1411 unsigned int i; 1412 int ret = 0; 1413 1414 pm_runtime_get_sync(dp->dev); 1415 dp->enabled = true; 1416 zynqmp_dp_update_misc(dp); 1417 if (zynqmp_disp_audio_enabled(dp->dpsub->disp)) 1418 zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 1); 1419 zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, 0); 1420 if (dp->status == connector_status_connected) { 1421 for (i = 0; i < 3; i++) { 1422 ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, 1423 DP_SET_POWER_D0); 1424 if (ret == 1) 1425 break; 1426 usleep_range(300, 500); 1427 } 1428 /* Some monitors take time to wake up properly */ 1429 msleep(zynqmp_dp_power_on_delay_ms); 1430 } 1431 if (ret != 1) 1432 dev_dbg(dp->dev, "DP aux failed\n"); 1433 else 1434 zynqmp_dp_train_loop(dp); 1435 zynqmp_dp_write(dp, ZYNQMP_DP_SOFTWARE_RESET, 1436 ZYNQMP_DP_SOFTWARE_RESET_ALL); 1437 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 1); 1438 } 1439 1440 static void zynqmp_dp_encoder_disable(struct drm_encoder *encoder) 1441 { 1442 struct zynqmp_dp *dp = encoder_to_dp(encoder); 1443 1444 dp->enabled = false; 1445 cancel_delayed_work(&dp->hpd_work); 1446 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 0); 1447 drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D3); 1448 zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, 1449 ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL); 1450 if (zynqmp_disp_audio_enabled(dp->dpsub->disp)) 1451 zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 0); 1452 pm_runtime_put_sync(dp->dev); 1453 } 1454 1455 static void 1456 zynqmp_dp_encoder_atomic_mode_set(struct drm_encoder *encoder, 1457 struct drm_crtc_state *crtc_state, 1458 struct drm_connector_state *connector_state) 1459 { 1460 struct zynqmp_dp *dp = encoder_to_dp(encoder); 1461 struct drm_display_mode *mode = &crtc_state->mode; 1462 struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode; 1463 u8 max_lanes = dp->link_config.max_lanes; 1464 u8 bpp = dp->config.bpp; 1465 int rate, max_rate = dp->link_config.max_rate; 1466 int ret; 1467 1468 zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8); 1469 1470 /* Check again as bpp or format might have been chagned */ 1471 rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp); 1472 if (mode->clock > rate) { 1473 dev_err(dp->dev, "the mode, %s,has too high pixel rate\n", 1474 mode->name); 1475 drm_mode_debug_printmodeline(mode); 1476 } 1477 1478 ret = zynqmp_dp_mode_configure(dp, adjusted_mode->clock, 0); 1479 if (ret < 0) 1480 return; 1481 1482 zynqmp_dp_encoder_mode_set_transfer_unit(dp, adjusted_mode); 1483 zynqmp_dp_encoder_mode_set_stream(dp, adjusted_mode); 1484 } 1485 1486 #define ZYNQMP_DP_MIN_H_BACKPORCH 20 1487 1488 static int 1489 zynqmp_dp_encoder_atomic_check(struct drm_encoder *encoder, 1490 struct drm_crtc_state *crtc_state, 1491 struct drm_connector_state *conn_state) 1492 { 1493 struct drm_display_mode *mode = &crtc_state->mode; 1494 struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode; 1495 int diff = mode->htotal - mode->hsync_end; 1496 1497 /* 1498 * ZynqMP DP requires horizontal backporch to be greater than 12. 1499 * This limitation may not be compatible with the sink device. 1500 */ 1501 if (diff < ZYNQMP_DP_MIN_H_BACKPORCH) { 1502 int vrefresh = (adjusted_mode->clock * 1000) / 1503 (adjusted_mode->vtotal * adjusted_mode->htotal); 1504 1505 dev_dbg(encoder->dev->dev, "hbackporch adjusted: %d to %d", 1506 diff, ZYNQMP_DP_MIN_H_BACKPORCH - diff); 1507 diff = ZYNQMP_DP_MIN_H_BACKPORCH - diff; 1508 adjusted_mode->htotal += diff; 1509 adjusted_mode->clock = adjusted_mode->vtotal * 1510 adjusted_mode->htotal * vrefresh / 1000; 1511 } 1512 1513 return 0; 1514 } 1515 1516 static const struct drm_encoder_helper_funcs zynqmp_dp_encoder_helper_funcs = { 1517 .enable = zynqmp_dp_encoder_enable, 1518 .disable = zynqmp_dp_encoder_disable, 1519 .atomic_mode_set = zynqmp_dp_encoder_atomic_mode_set, 1520 .atomic_check = zynqmp_dp_encoder_atomic_check, 1521 }; 1522 1523 /* ----------------------------------------------------------------------------- 1524 * Interrupt Handling 1525 */ 1526 1527 /** 1528 * zynqmp_dp_enable_vblank - Enable vblank 1529 * @dp: DisplayPort IP core structure 1530 * 1531 * Enable vblank interrupt 1532 */ 1533 void zynqmp_dp_enable_vblank(struct zynqmp_dp *dp) 1534 { 1535 zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_VBLANK_START); 1536 } 1537 1538 /** 1539 * zynqmp_dp_disable_vblank - Disable vblank 1540 * @dp: DisplayPort IP core structure 1541 * 1542 * Disable vblank interrupt 1543 */ 1544 void zynqmp_dp_disable_vblank(struct zynqmp_dp *dp) 1545 { 1546 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_VBLANK_START); 1547 } 1548 1549 static void zynqmp_dp_hpd_work_func(struct work_struct *work) 1550 { 1551 struct zynqmp_dp *dp; 1552 1553 dp = container_of(work, struct zynqmp_dp, hpd_work.work); 1554 1555 if (dp->drm) 1556 drm_helper_hpd_irq_event(dp->drm); 1557 } 1558 1559 static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data) 1560 { 1561 struct zynqmp_dp *dp = (struct zynqmp_dp *)data; 1562 u32 status, mask; 1563 1564 status = zynqmp_dp_read(dp, ZYNQMP_DP_INT_STATUS); 1565 mask = zynqmp_dp_read(dp, ZYNQMP_DP_INT_MASK); 1566 if (!(status & ~mask)) 1567 return IRQ_NONE; 1568 1569 /* dbg for diagnostic, but not much that the driver can do */ 1570 if (status & ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK) 1571 dev_dbg_ratelimited(dp->dev, "underflow interrupt\n"); 1572 if (status & ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK) 1573 dev_dbg_ratelimited(dp->dev, "overflow interrupt\n"); 1574 1575 zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status); 1576 1577 if (status & ZYNQMP_DP_INT_VBLANK_START) 1578 zynqmp_disp_handle_vblank(dp->dpsub->disp); 1579 1580 if (status & ZYNQMP_DP_INT_HPD_EVENT) 1581 schedule_delayed_work(&dp->hpd_work, 0); 1582 1583 if (status & ZYNQMP_DP_INT_HPD_IRQ) { 1584 int ret; 1585 u8 status[DP_LINK_STATUS_SIZE + 2]; 1586 1587 ret = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status, 1588 DP_LINK_STATUS_SIZE + 2); 1589 if (ret < 0) 1590 goto handled; 1591 1592 if (status[4] & DP_LINK_STATUS_UPDATED || 1593 !drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) || 1594 !drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) { 1595 zynqmp_dp_train_loop(dp); 1596 } 1597 } 1598 1599 handled: 1600 return IRQ_HANDLED; 1601 } 1602 1603 /* ----------------------------------------------------------------------------- 1604 * Initialization & Cleanup 1605 */ 1606 1607 int zynqmp_dp_drm_init(struct zynqmp_dpsub *dpsub) 1608 { 1609 struct zynqmp_dp *dp = dpsub->dp; 1610 struct drm_encoder *encoder = &dp->encoder; 1611 struct drm_connector *connector = &dp->connector; 1612 int ret; 1613 1614 dp->config.misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK; 1615 zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8); 1616 1617 /* Create the DRM encoder and connector. */ 1618 encoder->possible_crtcs |= zynqmp_disp_get_crtc_mask(dpsub->disp); 1619 drm_simple_encoder_init(dp->drm, encoder, DRM_MODE_ENCODER_TMDS); 1620 drm_encoder_helper_add(encoder, &zynqmp_dp_encoder_helper_funcs); 1621 1622 connector->polled = DRM_CONNECTOR_POLL_HPD; 1623 ret = drm_connector_init(encoder->dev, connector, 1624 &zynqmp_dp_connector_funcs, 1625 DRM_MODE_CONNECTOR_DisplayPort); 1626 if (ret) { 1627 dev_err(dp->dev, "failed to create the DRM connector\n"); 1628 return ret; 1629 } 1630 1631 drm_connector_helper_add(connector, &zynqmp_dp_connector_helper_funcs); 1632 drm_connector_register(connector); 1633 drm_connector_attach_encoder(connector, encoder); 1634 1635 /* Initialize and register the AUX adapter. */ 1636 ret = zynqmp_dp_aux_init(dp); 1637 if (ret) { 1638 dev_err(dp->dev, "failed to initialize DP aux\n"); 1639 return ret; 1640 } 1641 1642 /* Now that initialisation is complete, enable interrupts. */ 1643 zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_ALL); 1644 1645 return 0; 1646 } 1647 1648 int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub, struct drm_device *drm) 1649 { 1650 struct platform_device *pdev = to_platform_device(dpsub->dev); 1651 struct zynqmp_dp *dp; 1652 struct resource *res; 1653 int ret; 1654 1655 dp = drmm_kzalloc(drm, sizeof(*dp), GFP_KERNEL); 1656 if (!dp) 1657 return -ENOMEM; 1658 1659 dp->dev = &pdev->dev; 1660 dp->dpsub = dpsub; 1661 dp->status = connector_status_disconnected; 1662 dp->drm = drm; 1663 1664 INIT_DELAYED_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func); 1665 1666 dpsub->dp = dp; 1667 1668 /* Acquire all resources (IOMEM, IRQ and PHYs). */ 1669 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dp"); 1670 dp->iomem = devm_ioremap_resource(dp->dev, res); 1671 if (IS_ERR(dp->iomem)) 1672 return PTR_ERR(dp->iomem); 1673 1674 dp->irq = platform_get_irq(pdev, 0); 1675 if (dp->irq < 0) 1676 return dp->irq; 1677 1678 dp->reset = devm_reset_control_get(dp->dev, NULL); 1679 if (IS_ERR(dp->reset)) { 1680 if (PTR_ERR(dp->reset) != -EPROBE_DEFER) 1681 dev_err(dp->dev, "failed to get reset: %ld\n", 1682 PTR_ERR(dp->reset)); 1683 return PTR_ERR(dp->reset); 1684 } 1685 1686 ret = zynqmp_dp_phy_probe(dp); 1687 if (ret) 1688 return ret; 1689 1690 /* Initialize the hardware. */ 1691 zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, 1692 ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL); 1693 zynqmp_dp_set(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET); 1694 zynqmp_dp_write(dp, ZYNQMP_DP_FORCE_SCRAMBLER_RESET, 1); 1695 zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0); 1696 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff); 1697 1698 ret = zynqmp_dp_phy_init(dp); 1699 if (ret) 1700 return ret; 1701 1702 zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 1); 1703 1704 /* 1705 * Now that the hardware is initialized and won't generate spurious 1706 * interrupts, request the IRQ. 1707 */ 1708 ret = devm_request_threaded_irq(dp->dev, dp->irq, NULL, 1709 zynqmp_dp_irq_handler, IRQF_ONESHOT, 1710 dev_name(dp->dev), dp); 1711 if (ret < 0) 1712 goto error; 1713 1714 dev_dbg(dp->dev, "ZynqMP DisplayPort Tx probed with %u lanes\n", 1715 dp->num_lanes); 1716 1717 return 0; 1718 1719 error: 1720 zynqmp_dp_phy_exit(dp); 1721 return ret; 1722 } 1723 1724 void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub) 1725 { 1726 struct zynqmp_dp *dp = dpsub->dp; 1727 1728 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_ALL); 1729 disable_irq(dp->irq); 1730 1731 cancel_delayed_work_sync(&dp->hpd_work); 1732 zynqmp_dp_aux_cleanup(dp); 1733 1734 zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0); 1735 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff); 1736 1737 zynqmp_dp_phy_exit(dp); 1738 } 1739