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 zynqmp_dp_clr(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET); 406 407 /* 408 * Power on lanes in reverse order as only lane 0 waits for the PLL to 409 * lock. 410 */ 411 for (i = dp->num_lanes - 1; i >= 0; i--) { 412 ret = phy_power_on(dp->phy[i]); 413 if (ret) { 414 dev_err(dp->dev, "failed to power on phy lane %d\n", i); 415 return ret; 416 } 417 } 418 419 return 0; 420 } 421 422 /** 423 * zynqmp_dp_phy_exit - Exit the phy 424 * @dp: DisplayPort IP core structure 425 * 426 * Exit the phy. 427 */ 428 static void zynqmp_dp_phy_exit(struct zynqmp_dp *dp) 429 { 430 unsigned int i; 431 int ret; 432 433 for (i = 0; i < dp->num_lanes; i++) { 434 ret = phy_power_off(dp->phy[i]); 435 if (ret) 436 dev_err(dp->dev, "failed to power off phy(%d) %d\n", i, 437 ret); 438 } 439 440 for (i = 0; i < dp->num_lanes; i++) { 441 ret = phy_exit(dp->phy[i]); 442 if (ret) 443 dev_err(dp->dev, "failed to exit phy(%d) %d\n", i, ret); 444 } 445 } 446 447 /** 448 * zynqmp_dp_phy_probe - Probe the PHYs 449 * @dp: DisplayPort IP core structure 450 * 451 * Probe PHYs for all lanes. Less PHYs may be available than the number of 452 * lanes, which is not considered an error as long as at least one PHY is 453 * found. The caller can check dp->num_lanes to check how many PHYs were found. 454 * 455 * Return: 456 * * 0 - Success 457 * * -ENXIO - No PHY found 458 * * -EPROBE_DEFER - Probe deferral requested 459 * * Other negative value - PHY retrieval failure 460 */ 461 static int zynqmp_dp_phy_probe(struct zynqmp_dp *dp) 462 { 463 unsigned int i; 464 465 for (i = 0; i < ZYNQMP_DP_MAX_LANES; i++) { 466 char phy_name[16]; 467 struct phy *phy; 468 469 snprintf(phy_name, sizeof(phy_name), "dp-phy%d", i); 470 phy = devm_phy_get(dp->dev, phy_name); 471 472 if (IS_ERR(phy)) { 473 switch (PTR_ERR(phy)) { 474 case -ENODEV: 475 if (dp->num_lanes) 476 return 0; 477 478 dev_err(dp->dev, "no PHY found\n"); 479 return -ENXIO; 480 481 case -EPROBE_DEFER: 482 return -EPROBE_DEFER; 483 484 default: 485 dev_err(dp->dev, "failed to get PHY lane %u\n", 486 i); 487 return PTR_ERR(phy); 488 } 489 } 490 491 dp->phy[i] = phy; 492 dp->num_lanes++; 493 } 494 495 return 0; 496 } 497 498 /** 499 * zynqmp_dp_phy_ready - Check if PHY is ready 500 * @dp: DisplayPort IP core structure 501 * 502 * Check if PHY is ready. If PHY is not ready, wait 1ms to check for 100 times. 503 * This amount of delay was suggested by IP designer. 504 * 505 * Return: 0 if PHY is ready, or -ENODEV if PHY is not ready. 506 */ 507 static int zynqmp_dp_phy_ready(struct zynqmp_dp *dp) 508 { 509 u32 i, reg, ready; 510 511 ready = (1 << dp->num_lanes) - 1; 512 513 /* Wait for 100 * 1ms. This should be enough time for PHY to be ready */ 514 for (i = 0; ; i++) { 515 reg = zynqmp_dp_read(dp, ZYNQMP_DP_PHY_STATUS); 516 if ((reg & ready) == ready) 517 return 0; 518 519 if (i == 100) { 520 dev_err(dp->dev, "PHY isn't ready\n"); 521 return -ENODEV; 522 } 523 524 usleep_range(1000, 1100); 525 } 526 527 return 0; 528 } 529 530 /* ----------------------------------------------------------------------------- 531 * DisplayPort Link Training 532 */ 533 534 /** 535 * zynqmp_dp_max_rate - Calculate and return available max pixel clock 536 * @link_rate: link rate (Kilo-bytes / sec) 537 * @lane_num: number of lanes 538 * @bpp: bits per pixel 539 * 540 * Return: max pixel clock (KHz) supported by current link config. 541 */ 542 static inline int zynqmp_dp_max_rate(int link_rate, u8 lane_num, u8 bpp) 543 { 544 return link_rate * lane_num * 8 / bpp; 545 } 546 547 /** 548 * zynqmp_dp_mode_configure - Configure the link values 549 * @dp: DisplayPort IP core structure 550 * @pclock: pixel clock for requested display mode 551 * @current_bw: current link rate 552 * 553 * Find the link configuration values, rate and lane count for requested pixel 554 * clock @pclock. The @pclock is stored in the mode to be used in other 555 * functions later. The returned rate is downshifted from the current rate 556 * @current_bw. 557 * 558 * Return: Current link rate code, or -EINVAL. 559 */ 560 static int zynqmp_dp_mode_configure(struct zynqmp_dp *dp, int pclock, 561 u8 current_bw) 562 { 563 int max_rate = dp->link_config.max_rate; 564 u8 bw_code; 565 u8 max_lanes = dp->link_config.max_lanes; 566 u8 max_link_rate_code = drm_dp_link_rate_to_bw_code(max_rate); 567 u8 bpp = dp->config.bpp; 568 u8 lane_cnt; 569 570 /* Downshift from current bandwidth */ 571 switch (current_bw) { 572 case DP_LINK_BW_5_4: 573 bw_code = DP_LINK_BW_2_7; 574 break; 575 case DP_LINK_BW_2_7: 576 bw_code = DP_LINK_BW_1_62; 577 break; 578 case DP_LINK_BW_1_62: 579 dev_err(dp->dev, "can't downshift. already lowest link rate\n"); 580 return -EINVAL; 581 default: 582 /* If not given, start with max supported */ 583 bw_code = max_link_rate_code; 584 break; 585 } 586 587 for (lane_cnt = 1; lane_cnt <= max_lanes; lane_cnt <<= 1) { 588 int bw; 589 u32 rate; 590 591 bw = drm_dp_bw_code_to_link_rate(bw_code); 592 rate = zynqmp_dp_max_rate(bw, lane_cnt, bpp); 593 if (pclock <= rate) { 594 dp->mode.bw_code = bw_code; 595 dp->mode.lane_cnt = lane_cnt; 596 dp->mode.pclock = pclock; 597 return dp->mode.bw_code; 598 } 599 } 600 601 dev_err(dp->dev, "failed to configure link values\n"); 602 603 return -EINVAL; 604 } 605 606 /** 607 * zynqmp_dp_adjust_train - Adjust train values 608 * @dp: DisplayPort IP core structure 609 * @link_status: link status from sink which contains requested training values 610 */ 611 static void zynqmp_dp_adjust_train(struct zynqmp_dp *dp, 612 u8 link_status[DP_LINK_STATUS_SIZE]) 613 { 614 u8 *train_set = dp->train_set; 615 u8 voltage = 0, preemphasis = 0; 616 u8 i; 617 618 for (i = 0; i < dp->mode.lane_cnt; i++) { 619 u8 v = drm_dp_get_adjust_request_voltage(link_status, i); 620 u8 p = drm_dp_get_adjust_request_pre_emphasis(link_status, i); 621 622 if (v > voltage) 623 voltage = v; 624 625 if (p > preemphasis) 626 preemphasis = p; 627 } 628 629 if (voltage >= DP_TRAIN_VOLTAGE_SWING_LEVEL_3) 630 voltage |= DP_TRAIN_MAX_SWING_REACHED; 631 632 if (preemphasis >= DP_TRAIN_PRE_EMPH_LEVEL_2) 633 preemphasis |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; 634 635 for (i = 0; i < dp->mode.lane_cnt; i++) 636 train_set[i] = voltage | preemphasis; 637 } 638 639 /** 640 * zynqmp_dp_update_vs_emph - Update the training values 641 * @dp: DisplayPort IP core structure 642 * 643 * Update the training values based on the request from sink. The mapped values 644 * are predefined, and values(vs, pe, pc) are from the device manual. 645 * 646 * Return: 0 if vs and emph are updated successfully, or the error code returned 647 * by drm_dp_dpcd_write(). 648 */ 649 static int zynqmp_dp_update_vs_emph(struct zynqmp_dp *dp) 650 { 651 unsigned int i; 652 int ret; 653 654 ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, dp->train_set, 655 dp->mode.lane_cnt); 656 if (ret < 0) 657 return ret; 658 659 for (i = 0; i < dp->mode.lane_cnt; i++) { 660 u32 reg = ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 + i * 4; 661 union phy_configure_opts opts = { 0 }; 662 u8 train = dp->train_set[i]; 663 664 opts.dp.voltage[0] = (train & DP_TRAIN_VOLTAGE_SWING_MASK) 665 >> DP_TRAIN_VOLTAGE_SWING_SHIFT; 666 opts.dp.pre[0] = (train & DP_TRAIN_PRE_EMPHASIS_MASK) 667 >> DP_TRAIN_PRE_EMPHASIS_SHIFT; 668 669 phy_configure(dp->phy[i], &opts); 670 671 zynqmp_dp_write(dp, reg, 0x2); 672 } 673 674 return 0; 675 } 676 677 /** 678 * zynqmp_dp_link_train_cr - Train clock recovery 679 * @dp: DisplayPort IP core structure 680 * 681 * Return: 0 if clock recovery train is done successfully, or corresponding 682 * error code. 683 */ 684 static int zynqmp_dp_link_train_cr(struct zynqmp_dp *dp) 685 { 686 u8 link_status[DP_LINK_STATUS_SIZE]; 687 u8 lane_cnt = dp->mode.lane_cnt; 688 u8 vs = 0, tries = 0; 689 u16 max_tries, i; 690 bool cr_done; 691 int ret; 692 693 zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, 694 DP_TRAINING_PATTERN_1); 695 ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, 696 DP_TRAINING_PATTERN_1 | 697 DP_LINK_SCRAMBLING_DISABLE); 698 if (ret < 0) 699 return ret; 700 701 /* 702 * 256 loops should be maximum iterations for 4 lanes and 4 values. 703 * So, This loop should exit before 512 iterations 704 */ 705 for (max_tries = 0; max_tries < 512; max_tries++) { 706 ret = zynqmp_dp_update_vs_emph(dp); 707 if (ret) 708 return ret; 709 710 drm_dp_link_train_clock_recovery_delay(&dp->aux, dp->dpcd); 711 ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status); 712 if (ret < 0) 713 return ret; 714 715 cr_done = drm_dp_clock_recovery_ok(link_status, lane_cnt); 716 if (cr_done) 717 break; 718 719 for (i = 0; i < lane_cnt; i++) 720 if (!(dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED)) 721 break; 722 if (i == lane_cnt) 723 break; 724 725 if ((dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == vs) 726 tries++; 727 else 728 tries = 0; 729 730 if (tries == DP_MAX_TRAINING_TRIES) 731 break; 732 733 vs = dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK; 734 zynqmp_dp_adjust_train(dp, link_status); 735 } 736 737 if (!cr_done) 738 return -EIO; 739 740 return 0; 741 } 742 743 /** 744 * zynqmp_dp_link_train_ce - Train channel equalization 745 * @dp: DisplayPort IP core structure 746 * 747 * Return: 0 if channel equalization train is done successfully, or 748 * corresponding error code. 749 */ 750 static int zynqmp_dp_link_train_ce(struct zynqmp_dp *dp) 751 { 752 u8 link_status[DP_LINK_STATUS_SIZE]; 753 u8 lane_cnt = dp->mode.lane_cnt; 754 u32 pat, tries; 755 int ret; 756 bool ce_done; 757 758 if (dp->dpcd[DP_DPCD_REV] >= DP_V1_2 && 759 dp->dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED) 760 pat = DP_TRAINING_PATTERN_3; 761 else 762 pat = DP_TRAINING_PATTERN_2; 763 764 zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, pat); 765 ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, 766 pat | DP_LINK_SCRAMBLING_DISABLE); 767 if (ret < 0) 768 return ret; 769 770 for (tries = 0; tries < DP_MAX_TRAINING_TRIES; tries++) { 771 ret = zynqmp_dp_update_vs_emph(dp); 772 if (ret) 773 return ret; 774 775 drm_dp_link_train_channel_eq_delay(&dp->aux, dp->dpcd); 776 ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status); 777 if (ret < 0) 778 return ret; 779 780 ce_done = drm_dp_channel_eq_ok(link_status, lane_cnt); 781 if (ce_done) 782 break; 783 784 zynqmp_dp_adjust_train(dp, link_status); 785 } 786 787 if (!ce_done) 788 return -EIO; 789 790 return 0; 791 } 792 793 /** 794 * zynqmp_dp_link_train - Train the link 795 * @dp: DisplayPort IP core structure 796 * 797 * Return: 0 if all trains are done successfully, or corresponding error code. 798 */ 799 static int zynqmp_dp_train(struct zynqmp_dp *dp) 800 { 801 u32 reg; 802 u8 bw_code = dp->mode.bw_code; 803 u8 lane_cnt = dp->mode.lane_cnt; 804 u8 aux_lane_cnt = lane_cnt; 805 bool enhanced; 806 int ret; 807 808 zynqmp_dp_write(dp, ZYNQMP_DP_LANE_COUNT_SET, lane_cnt); 809 enhanced = drm_dp_enhanced_frame_cap(dp->dpcd); 810 if (enhanced) { 811 zynqmp_dp_write(dp, ZYNQMP_DP_ENHANCED_FRAME_EN, 1); 812 aux_lane_cnt |= DP_LANE_COUNT_ENHANCED_FRAME_EN; 813 } 814 815 if (dp->dpcd[3] & 0x1) { 816 zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 1); 817 drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, 818 DP_SPREAD_AMP_0_5); 819 } else { 820 zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 0); 821 drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, 0); 822 } 823 824 ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, aux_lane_cnt); 825 if (ret < 0) { 826 dev_err(dp->dev, "failed to set lane count\n"); 827 return ret; 828 } 829 830 ret = drm_dp_dpcd_writeb(&dp->aux, DP_MAIN_LINK_CHANNEL_CODING_SET, 831 DP_SET_ANSI_8B10B); 832 if (ret < 0) { 833 dev_err(dp->dev, "failed to set ANSI 8B/10B encoding\n"); 834 return ret; 835 } 836 837 ret = drm_dp_dpcd_writeb(&dp->aux, DP_LINK_BW_SET, bw_code); 838 if (ret < 0) { 839 dev_err(dp->dev, "failed to set DP bandwidth\n"); 840 return ret; 841 } 842 843 zynqmp_dp_write(dp, ZYNQMP_DP_LINK_BW_SET, bw_code); 844 switch (bw_code) { 845 case DP_LINK_BW_1_62: 846 reg = ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G; 847 break; 848 case DP_LINK_BW_2_7: 849 reg = ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G; 850 break; 851 case DP_LINK_BW_5_4: 852 default: 853 reg = ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G; 854 break; 855 } 856 857 zynqmp_dp_write(dp, ZYNQMP_DP_PHY_CLOCK_SELECT, reg); 858 ret = zynqmp_dp_phy_ready(dp); 859 if (ret < 0) 860 return ret; 861 862 zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 1); 863 memset(dp->train_set, 0, sizeof(dp->train_set)); 864 ret = zynqmp_dp_link_train_cr(dp); 865 if (ret) 866 return ret; 867 868 ret = zynqmp_dp_link_train_ce(dp); 869 if (ret) 870 return ret; 871 872 ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, 873 DP_TRAINING_PATTERN_DISABLE); 874 if (ret < 0) { 875 dev_err(dp->dev, "failed to disable training pattern\n"); 876 return ret; 877 } 878 zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, 879 DP_TRAINING_PATTERN_DISABLE); 880 881 zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 0); 882 883 return 0; 884 } 885 886 /** 887 * zynqmp_dp_train_loop - Downshift the link rate during training 888 * @dp: DisplayPort IP core structure 889 * 890 * Train the link by downshifting the link rate if training is not successful. 891 */ 892 static void zynqmp_dp_train_loop(struct zynqmp_dp *dp) 893 { 894 struct zynqmp_dp_mode *mode = &dp->mode; 895 u8 bw = mode->bw_code; 896 int ret; 897 898 do { 899 if (dp->status == connector_status_disconnected || 900 !dp->enabled) 901 return; 902 903 ret = zynqmp_dp_train(dp); 904 if (!ret) 905 return; 906 907 ret = zynqmp_dp_mode_configure(dp, mode->pclock, bw); 908 if (ret < 0) 909 goto err_out; 910 911 bw = ret; 912 } while (bw >= DP_LINK_BW_1_62); 913 914 err_out: 915 dev_err(dp->dev, "failed to train the DP link\n"); 916 } 917 918 /* ----------------------------------------------------------------------------- 919 * DisplayPort AUX 920 */ 921 922 #define AUX_READ_BIT 0x1 923 924 /** 925 * zynqmp_dp_aux_cmd_submit - Submit aux command 926 * @dp: DisplayPort IP core structure 927 * @cmd: aux command 928 * @addr: aux address 929 * @buf: buffer for command data 930 * @bytes: number of bytes for @buf 931 * @reply: reply code to be returned 932 * 933 * Submit an aux command. All aux related commands, native or i2c aux 934 * read/write, are submitted through this function. The function is mapped to 935 * the transfer function of struct drm_dp_aux. This function involves in 936 * multiple register reads/writes, thus synchronization is needed, and it is 937 * done by drm_dp_helper using @hw_mutex. The calling thread goes into sleep 938 * if there's no immediate reply to the command submission. The reply code is 939 * returned at @reply if @reply != NULL. 940 * 941 * Return: 0 if the command is submitted properly, or corresponding error code: 942 * -EBUSY when there is any request already being processed 943 * -ETIMEDOUT when receiving reply is timed out 944 * -EIO when received bytes are less than requested 945 */ 946 static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp *dp, u32 cmd, u16 addr, 947 u8 *buf, u8 bytes, u8 *reply) 948 { 949 bool is_read = (cmd & AUX_READ_BIT) ? true : false; 950 u32 reg, i; 951 952 reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); 953 if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST) 954 return -EBUSY; 955 956 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_ADDRESS, addr); 957 if (!is_read) 958 for (i = 0; i < bytes; i++) 959 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_WRITE_FIFO, 960 buf[i]); 961 962 reg = cmd << ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT; 963 if (!buf || !bytes) 964 reg |= ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY; 965 else 966 reg |= (bytes - 1) << ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT; 967 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_COMMAND, reg); 968 969 /* Wait for reply to be delivered upto 2ms */ 970 for (i = 0; ; i++) { 971 reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); 972 if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY) 973 break; 974 975 if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT || 976 i == 2) 977 return -ETIMEDOUT; 978 979 usleep_range(1000, 1100); 980 } 981 982 reg = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_CODE); 983 if (reply) 984 *reply = reg; 985 986 if (is_read && 987 (reg == ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK || 988 reg == ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK)) { 989 reg = zynqmp_dp_read(dp, ZYNQMP_DP_REPLY_DATA_COUNT); 990 if ((reg & ZYNQMP_DP_REPLY_DATA_COUNT_MASK) != bytes) 991 return -EIO; 992 993 for (i = 0; i < bytes; i++) 994 buf[i] = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_DATA); 995 } 996 997 return 0; 998 } 999 1000 static ssize_t 1001 zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) 1002 { 1003 struct zynqmp_dp *dp = container_of(aux, struct zynqmp_dp, aux); 1004 int ret; 1005 unsigned int i, iter; 1006 1007 /* Number of loops = timeout in msec / aux delay (400 usec) */ 1008 iter = zynqmp_dp_aux_timeout_ms * 1000 / 400; 1009 iter = iter ? iter : 1; 1010 1011 for (i = 0; i < iter; i++) { 1012 ret = zynqmp_dp_aux_cmd_submit(dp, msg->request, msg->address, 1013 msg->buffer, msg->size, 1014 &msg->reply); 1015 if (!ret) { 1016 dev_dbg(dp->dev, "aux %d retries\n", i); 1017 return msg->size; 1018 } 1019 1020 if (dp->status == connector_status_disconnected) { 1021 dev_dbg(dp->dev, "no connected aux device\n"); 1022 return -ENODEV; 1023 } 1024 1025 usleep_range(400, 500); 1026 } 1027 1028 dev_dbg(dp->dev, "failed to do aux transfer (%d)\n", ret); 1029 1030 return ret; 1031 } 1032 1033 /** 1034 * zynqmp_dp_aux_init - Initialize and register the DP AUX 1035 * @dp: DisplayPort IP core structure 1036 * 1037 * Program the AUX clock divider and filter and register the DP AUX adapter. 1038 * 1039 * Return: 0 on success, error value otherwise 1040 */ 1041 static int zynqmp_dp_aux_init(struct zynqmp_dp *dp) 1042 { 1043 unsigned long rate; 1044 unsigned int w; 1045 1046 /* 1047 * The AUX_SIGNAL_WIDTH_FILTER is the number of APB clock cycles 1048 * corresponding to the AUX pulse. Allowable values are 8, 16, 24, 32, 1049 * 40 and 48. The AUX pulse width must be between 0.4µs and 0.6µs, 1050 * compute the w / 8 value corresponding to 0.4µs rounded up, and make 1051 * sure it stays below 0.6µs and within the allowable values. 1052 */ 1053 rate = clk_get_rate(dp->dpsub->apb_clk); 1054 w = DIV_ROUND_UP(4 * rate, 1000 * 1000 * 10 * 8) * 8; 1055 if (w > 6 * rate / (1000 * 1000 * 10) || w > 48) { 1056 dev_err(dp->dev, "aclk frequency too high\n"); 1057 return -EINVAL; 1058 } 1059 1060 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_CLK_DIVIDER, 1061 (w << ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT) | 1062 (rate / (1000 * 1000))); 1063 1064 dp->aux.name = "ZynqMP DP AUX"; 1065 dp->aux.dev = dp->dev; 1066 dp->aux.drm_dev = dp->drm; 1067 dp->aux.transfer = zynqmp_dp_aux_transfer; 1068 1069 return drm_dp_aux_register(&dp->aux); 1070 } 1071 1072 /** 1073 * zynqmp_dp_aux_cleanup - Cleanup the DP AUX 1074 * @dp: DisplayPort IP core structure 1075 * 1076 * Unregister the DP AUX adapter. 1077 */ 1078 static void zynqmp_dp_aux_cleanup(struct zynqmp_dp *dp) 1079 { 1080 drm_dp_aux_unregister(&dp->aux); 1081 } 1082 1083 /* ----------------------------------------------------------------------------- 1084 * DisplayPort Generic Support 1085 */ 1086 1087 /** 1088 * zynqmp_dp_update_misc - Write the misc registers 1089 * @dp: DisplayPort IP core structure 1090 * 1091 * The misc register values are stored in the structure, and this 1092 * function applies the values into the registers. 1093 */ 1094 static void zynqmp_dp_update_misc(struct zynqmp_dp *dp) 1095 { 1096 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC0, dp->config.misc0); 1097 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC1, dp->config.misc1); 1098 } 1099 1100 /** 1101 * zynqmp_dp_set_format - Set the input format 1102 * @dp: DisplayPort IP core structure 1103 * @format: input format 1104 * @bpc: bits per component 1105 * 1106 * Update misc register values based on input @format and @bpc. 1107 * 1108 * Return: 0 on success, or -EINVAL. 1109 */ 1110 static int zynqmp_dp_set_format(struct zynqmp_dp *dp, 1111 enum zynqmp_dpsub_format format, 1112 unsigned int bpc) 1113 { 1114 static const struct drm_display_info *display; 1115 struct zynqmp_dp_config *config = &dp->config; 1116 unsigned int num_colors; 1117 1118 config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK; 1119 config->misc1 &= ~ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN; 1120 1121 switch (format) { 1122 case ZYNQMP_DPSUB_FORMAT_RGB: 1123 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB; 1124 num_colors = 3; 1125 break; 1126 1127 case ZYNQMP_DPSUB_FORMAT_YCRCB444: 1128 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444; 1129 num_colors = 3; 1130 break; 1131 1132 case ZYNQMP_DPSUB_FORMAT_YCRCB422: 1133 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422; 1134 num_colors = 2; 1135 break; 1136 1137 case ZYNQMP_DPSUB_FORMAT_YONLY: 1138 config->misc1 |= ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN; 1139 num_colors = 1; 1140 break; 1141 1142 default: 1143 dev_err(dp->dev, "Invalid colormetry in DT\n"); 1144 return -EINVAL; 1145 } 1146 1147 display = &dp->connector.display_info; 1148 if (display->bpc && bpc > display->bpc) { 1149 dev_warn(dp->dev, 1150 "downgrading requested %ubpc to display limit %ubpc\n", 1151 bpc, display->bpc); 1152 bpc = display->bpc; 1153 } 1154 1155 config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK; 1156 1157 switch (bpc) { 1158 case 6: 1159 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6; 1160 break; 1161 case 8: 1162 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8; 1163 break; 1164 case 10: 1165 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10; 1166 break; 1167 case 12: 1168 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12; 1169 break; 1170 case 16: 1171 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16; 1172 break; 1173 default: 1174 dev_warn(dp->dev, "Not supported bpc (%u). fall back to 8bpc\n", 1175 bpc); 1176 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8; 1177 bpc = 8; 1178 break; 1179 } 1180 1181 /* Update the current bpp based on the format. */ 1182 config->bpp = bpc * num_colors; 1183 1184 return 0; 1185 } 1186 1187 /** 1188 * zynqmp_dp_encoder_mode_set_transfer_unit - Set the transfer unit values 1189 * @dp: DisplayPort IP core structure 1190 * @mode: requested display mode 1191 * 1192 * Set the transfer unit, and calculate all transfer unit size related values. 1193 * Calculation is based on DP and IP core specification. 1194 */ 1195 static void 1196 zynqmp_dp_encoder_mode_set_transfer_unit(struct zynqmp_dp *dp, 1197 struct drm_display_mode *mode) 1198 { 1199 u32 tu = ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF; 1200 u32 bw, vid_kbytes, avg_bytes_per_tu, init_wait; 1201 1202 /* Use the max transfer unit size (default) */ 1203 zynqmp_dp_write(dp, ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE, tu); 1204 1205 vid_kbytes = mode->clock * (dp->config.bpp / 8); 1206 bw = drm_dp_bw_code_to_link_rate(dp->mode.bw_code); 1207 avg_bytes_per_tu = vid_kbytes * tu / (dp->mode.lane_cnt * bw / 1000); 1208 zynqmp_dp_write(dp, ZYNQMP_DP_MIN_BYTES_PER_TU, 1209 avg_bytes_per_tu / 1000); 1210 zynqmp_dp_write(dp, ZYNQMP_DP_FRAC_BYTES_PER_TU, 1211 avg_bytes_per_tu % 1000); 1212 1213 /* Configure the initial wait cycle based on transfer unit size */ 1214 if (tu < (avg_bytes_per_tu / 1000)) 1215 init_wait = 0; 1216 else if ((avg_bytes_per_tu / 1000) <= 4) 1217 init_wait = tu; 1218 else 1219 init_wait = tu - avg_bytes_per_tu / 1000; 1220 1221 zynqmp_dp_write(dp, ZYNQMP_DP_INIT_WAIT, init_wait); 1222 } 1223 1224 /** 1225 * zynqmp_dp_encoder_mode_set_stream - Configure the main stream 1226 * @dp: DisplayPort IP core structure 1227 * @mode: requested display mode 1228 * 1229 * Configure the main stream based on the requested mode @mode. Calculation is 1230 * based on IP core specification. 1231 */ 1232 static void zynqmp_dp_encoder_mode_set_stream(struct zynqmp_dp *dp, 1233 const struct drm_display_mode *mode) 1234 { 1235 u8 lane_cnt = dp->mode.lane_cnt; 1236 u32 reg, wpl; 1237 unsigned int rate; 1238 1239 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HTOTAL, mode->htotal); 1240 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VTOTAL, mode->vtotal); 1241 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_POLARITY, 1242 (!!(mode->flags & DRM_MODE_FLAG_PVSYNC) << 1243 ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT) | 1244 (!!(mode->flags & DRM_MODE_FLAG_PHSYNC) << 1245 ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT)); 1246 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSWIDTH, 1247 mode->hsync_end - mode->hsync_start); 1248 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSWIDTH, 1249 mode->vsync_end - mode->vsync_start); 1250 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HRES, mode->hdisplay); 1251 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VRES, mode->vdisplay); 1252 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSTART, 1253 mode->htotal - mode->hsync_start); 1254 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSTART, 1255 mode->vtotal - mode->vsync_start); 1256 1257 /* In synchronous mode, set the diviers */ 1258 if (dp->config.misc0 & ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK) { 1259 reg = drm_dp_bw_code_to_link_rate(dp->mode.bw_code); 1260 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_N_VID, reg); 1261 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_M_VID, mode->clock); 1262 rate = zynqmp_disp_get_audio_clk_rate(dp->dpsub->disp); 1263 if (rate) { 1264 dev_dbg(dp->dev, "Audio rate: %d\n", rate / 512); 1265 zynqmp_dp_write(dp, ZYNQMP_DP_TX_N_AUD, reg); 1266 zynqmp_dp_write(dp, ZYNQMP_DP_TX_M_AUD, rate / 1000); 1267 } 1268 } 1269 1270 /* Only 2 channel audio is supported now */ 1271 if (zynqmp_disp_audio_enabled(dp->dpsub->disp)) 1272 zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CHANNELS, 1); 1273 1274 zynqmp_dp_write(dp, ZYNQMP_DP_USER_PIX_WIDTH, 1); 1275 1276 /* Translate to the native 16 bit datapath based on IP core spec */ 1277 wpl = (mode->hdisplay * dp->config.bpp + 15) / 16; 1278 reg = wpl + wpl % lane_cnt - lane_cnt; 1279 zynqmp_dp_write(dp, ZYNQMP_DP_USER_DATA_COUNT_PER_LANE, reg); 1280 } 1281 1282 /* ----------------------------------------------------------------------------- 1283 * DRM Connector 1284 */ 1285 1286 static enum drm_connector_status 1287 zynqmp_dp_connector_detect(struct drm_connector *connector, bool force) 1288 { 1289 struct zynqmp_dp *dp = connector_to_dp(connector); 1290 struct zynqmp_dp_link_config *link_config = &dp->link_config; 1291 u32 state, i; 1292 int ret; 1293 1294 /* 1295 * This is from heuristic. It takes some delay (ex, 100 ~ 500 msec) to 1296 * get the HPD signal with some monitors. 1297 */ 1298 for (i = 0; i < 10; i++) { 1299 state = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); 1300 if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD) 1301 break; 1302 msleep(100); 1303 } 1304 1305 if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD) { 1306 ret = drm_dp_dpcd_read(&dp->aux, 0x0, dp->dpcd, 1307 sizeof(dp->dpcd)); 1308 if (ret < 0) { 1309 dev_dbg(dp->dev, "DPCD read failed"); 1310 goto disconnected; 1311 } 1312 1313 link_config->max_rate = min_t(int, 1314 drm_dp_max_link_rate(dp->dpcd), 1315 DP_HIGH_BIT_RATE2); 1316 link_config->max_lanes = min_t(u8, 1317 drm_dp_max_lane_count(dp->dpcd), 1318 dp->num_lanes); 1319 1320 dp->status = connector_status_connected; 1321 return connector_status_connected; 1322 } 1323 1324 disconnected: 1325 dp->status = connector_status_disconnected; 1326 return connector_status_disconnected; 1327 } 1328 1329 static int zynqmp_dp_connector_get_modes(struct drm_connector *connector) 1330 { 1331 struct zynqmp_dp *dp = connector_to_dp(connector); 1332 struct edid *edid; 1333 int ret; 1334 1335 edid = drm_get_edid(connector, &dp->aux.ddc); 1336 if (!edid) 1337 return 0; 1338 1339 drm_connector_update_edid_property(connector, edid); 1340 ret = drm_add_edid_modes(connector, edid); 1341 kfree(edid); 1342 1343 return ret; 1344 } 1345 1346 static struct drm_encoder * 1347 zynqmp_dp_connector_best_encoder(struct drm_connector *connector) 1348 { 1349 struct zynqmp_dp *dp = connector_to_dp(connector); 1350 1351 return &dp->encoder; 1352 } 1353 1354 static int zynqmp_dp_connector_mode_valid(struct drm_connector *connector, 1355 struct drm_display_mode *mode) 1356 { 1357 struct zynqmp_dp *dp = connector_to_dp(connector); 1358 u8 max_lanes = dp->link_config.max_lanes; 1359 u8 bpp = dp->config.bpp; 1360 int max_rate = dp->link_config.max_rate; 1361 int rate; 1362 1363 if (mode->clock > ZYNQMP_MAX_FREQ) { 1364 dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n", 1365 mode->name); 1366 drm_mode_debug_printmodeline(mode); 1367 return MODE_CLOCK_HIGH; 1368 } 1369 1370 /* Check with link rate and lane count */ 1371 rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp); 1372 if (mode->clock > rate) { 1373 dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n", 1374 mode->name); 1375 drm_mode_debug_printmodeline(mode); 1376 return MODE_CLOCK_HIGH; 1377 } 1378 1379 return MODE_OK; 1380 } 1381 1382 static const struct drm_connector_funcs zynqmp_dp_connector_funcs = { 1383 .detect = zynqmp_dp_connector_detect, 1384 .fill_modes = drm_helper_probe_single_connector_modes, 1385 .destroy = drm_connector_cleanup, 1386 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 1387 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 1388 .reset = drm_atomic_helper_connector_reset, 1389 }; 1390 1391 static const struct drm_connector_helper_funcs 1392 zynqmp_dp_connector_helper_funcs = { 1393 .get_modes = zynqmp_dp_connector_get_modes, 1394 .best_encoder = zynqmp_dp_connector_best_encoder, 1395 .mode_valid = zynqmp_dp_connector_mode_valid, 1396 }; 1397 1398 /* ----------------------------------------------------------------------------- 1399 * DRM Encoder 1400 */ 1401 1402 static void zynqmp_dp_encoder_enable(struct drm_encoder *encoder) 1403 { 1404 struct zynqmp_dp *dp = encoder_to_dp(encoder); 1405 unsigned int i; 1406 int ret = 0; 1407 1408 pm_runtime_get_sync(dp->dev); 1409 dp->enabled = true; 1410 zynqmp_dp_update_misc(dp); 1411 if (zynqmp_disp_audio_enabled(dp->dpsub->disp)) 1412 zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 1); 1413 zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, 0); 1414 if (dp->status == connector_status_connected) { 1415 for (i = 0; i < 3; i++) { 1416 ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, 1417 DP_SET_POWER_D0); 1418 if (ret == 1) 1419 break; 1420 usleep_range(300, 500); 1421 } 1422 /* Some monitors take time to wake up properly */ 1423 msleep(zynqmp_dp_power_on_delay_ms); 1424 } 1425 if (ret != 1) 1426 dev_dbg(dp->dev, "DP aux failed\n"); 1427 else 1428 zynqmp_dp_train_loop(dp); 1429 zynqmp_dp_write(dp, ZYNQMP_DP_SOFTWARE_RESET, 1430 ZYNQMP_DP_SOFTWARE_RESET_ALL); 1431 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 1); 1432 } 1433 1434 static void zynqmp_dp_encoder_disable(struct drm_encoder *encoder) 1435 { 1436 struct zynqmp_dp *dp = encoder_to_dp(encoder); 1437 1438 dp->enabled = false; 1439 cancel_delayed_work(&dp->hpd_work); 1440 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 0); 1441 drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D3); 1442 zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, 1443 ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL); 1444 if (zynqmp_disp_audio_enabled(dp->dpsub->disp)) 1445 zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 0); 1446 pm_runtime_put_sync(dp->dev); 1447 } 1448 1449 static void 1450 zynqmp_dp_encoder_atomic_mode_set(struct drm_encoder *encoder, 1451 struct drm_crtc_state *crtc_state, 1452 struct drm_connector_state *connector_state) 1453 { 1454 struct zynqmp_dp *dp = encoder_to_dp(encoder); 1455 struct drm_display_mode *mode = &crtc_state->mode; 1456 struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode; 1457 u8 max_lanes = dp->link_config.max_lanes; 1458 u8 bpp = dp->config.bpp; 1459 int rate, max_rate = dp->link_config.max_rate; 1460 int ret; 1461 1462 zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8); 1463 1464 /* Check again as bpp or format might have been chagned */ 1465 rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp); 1466 if (mode->clock > rate) { 1467 dev_err(dp->dev, "the mode, %s,has too high pixel rate\n", 1468 mode->name); 1469 drm_mode_debug_printmodeline(mode); 1470 } 1471 1472 ret = zynqmp_dp_mode_configure(dp, adjusted_mode->clock, 0); 1473 if (ret < 0) 1474 return; 1475 1476 zynqmp_dp_encoder_mode_set_transfer_unit(dp, adjusted_mode); 1477 zynqmp_dp_encoder_mode_set_stream(dp, adjusted_mode); 1478 } 1479 1480 #define ZYNQMP_DP_MIN_H_BACKPORCH 20 1481 1482 static int 1483 zynqmp_dp_encoder_atomic_check(struct drm_encoder *encoder, 1484 struct drm_crtc_state *crtc_state, 1485 struct drm_connector_state *conn_state) 1486 { 1487 struct drm_display_mode *mode = &crtc_state->mode; 1488 struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode; 1489 int diff = mode->htotal - mode->hsync_end; 1490 1491 /* 1492 * ZynqMP DP requires horizontal backporch to be greater than 12. 1493 * This limitation may not be compatible with the sink device. 1494 */ 1495 if (diff < ZYNQMP_DP_MIN_H_BACKPORCH) { 1496 int vrefresh = (adjusted_mode->clock * 1000) / 1497 (adjusted_mode->vtotal * adjusted_mode->htotal); 1498 1499 dev_dbg(encoder->dev->dev, "hbackporch adjusted: %d to %d", 1500 diff, ZYNQMP_DP_MIN_H_BACKPORCH - diff); 1501 diff = ZYNQMP_DP_MIN_H_BACKPORCH - diff; 1502 adjusted_mode->htotal += diff; 1503 adjusted_mode->clock = adjusted_mode->vtotal * 1504 adjusted_mode->htotal * vrefresh / 1000; 1505 } 1506 1507 return 0; 1508 } 1509 1510 static const struct drm_encoder_helper_funcs zynqmp_dp_encoder_helper_funcs = { 1511 .enable = zynqmp_dp_encoder_enable, 1512 .disable = zynqmp_dp_encoder_disable, 1513 .atomic_mode_set = zynqmp_dp_encoder_atomic_mode_set, 1514 .atomic_check = zynqmp_dp_encoder_atomic_check, 1515 }; 1516 1517 /* ----------------------------------------------------------------------------- 1518 * Interrupt Handling 1519 */ 1520 1521 /** 1522 * zynqmp_dp_enable_vblank - Enable vblank 1523 * @dp: DisplayPort IP core structure 1524 * 1525 * Enable vblank interrupt 1526 */ 1527 void zynqmp_dp_enable_vblank(struct zynqmp_dp *dp) 1528 { 1529 zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_VBLANK_START); 1530 } 1531 1532 /** 1533 * zynqmp_dp_disable_vblank - Disable vblank 1534 * @dp: DisplayPort IP core structure 1535 * 1536 * Disable vblank interrupt 1537 */ 1538 void zynqmp_dp_disable_vblank(struct zynqmp_dp *dp) 1539 { 1540 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_VBLANK_START); 1541 } 1542 1543 static void zynqmp_dp_hpd_work_func(struct work_struct *work) 1544 { 1545 struct zynqmp_dp *dp; 1546 1547 dp = container_of(work, struct zynqmp_dp, hpd_work.work); 1548 1549 if (dp->drm) 1550 drm_helper_hpd_irq_event(dp->drm); 1551 } 1552 1553 static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data) 1554 { 1555 struct zynqmp_dp *dp = (struct zynqmp_dp *)data; 1556 u32 status, mask; 1557 1558 status = zynqmp_dp_read(dp, ZYNQMP_DP_INT_STATUS); 1559 mask = zynqmp_dp_read(dp, ZYNQMP_DP_INT_MASK); 1560 if (!(status & ~mask)) 1561 return IRQ_NONE; 1562 1563 /* dbg for diagnostic, but not much that the driver can do */ 1564 if (status & ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK) 1565 dev_dbg_ratelimited(dp->dev, "underflow interrupt\n"); 1566 if (status & ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK) 1567 dev_dbg_ratelimited(dp->dev, "overflow interrupt\n"); 1568 1569 zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status); 1570 1571 if (status & ZYNQMP_DP_INT_VBLANK_START) 1572 zynqmp_disp_handle_vblank(dp->dpsub->disp); 1573 1574 if (status & ZYNQMP_DP_INT_HPD_EVENT) 1575 schedule_delayed_work(&dp->hpd_work, 0); 1576 1577 if (status & ZYNQMP_DP_INT_HPD_IRQ) { 1578 int ret; 1579 u8 status[DP_LINK_STATUS_SIZE + 2]; 1580 1581 ret = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status, 1582 DP_LINK_STATUS_SIZE + 2); 1583 if (ret < 0) 1584 goto handled; 1585 1586 if (status[4] & DP_LINK_STATUS_UPDATED || 1587 !drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) || 1588 !drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) { 1589 zynqmp_dp_train_loop(dp); 1590 } 1591 } 1592 1593 handled: 1594 return IRQ_HANDLED; 1595 } 1596 1597 /* ----------------------------------------------------------------------------- 1598 * Initialization & Cleanup 1599 */ 1600 1601 int zynqmp_dp_drm_init(struct zynqmp_dpsub *dpsub) 1602 { 1603 struct zynqmp_dp *dp = dpsub->dp; 1604 struct drm_encoder *encoder = &dp->encoder; 1605 struct drm_connector *connector = &dp->connector; 1606 int ret; 1607 1608 dp->config.misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK; 1609 zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8); 1610 1611 /* Create the DRM encoder and connector. */ 1612 encoder->possible_crtcs |= zynqmp_disp_get_crtc_mask(dpsub->disp); 1613 drm_simple_encoder_init(dp->drm, encoder, DRM_MODE_ENCODER_TMDS); 1614 drm_encoder_helper_add(encoder, &zynqmp_dp_encoder_helper_funcs); 1615 1616 connector->polled = DRM_CONNECTOR_POLL_HPD; 1617 ret = drm_connector_init(encoder->dev, connector, 1618 &zynqmp_dp_connector_funcs, 1619 DRM_MODE_CONNECTOR_DisplayPort); 1620 if (ret) { 1621 dev_err(dp->dev, "failed to create the DRM connector\n"); 1622 return ret; 1623 } 1624 1625 drm_connector_helper_add(connector, &zynqmp_dp_connector_helper_funcs); 1626 drm_connector_register(connector); 1627 drm_connector_attach_encoder(connector, encoder); 1628 1629 /* Initialize and register the AUX adapter. */ 1630 ret = zynqmp_dp_aux_init(dp); 1631 if (ret) { 1632 dev_err(dp->dev, "failed to initialize DP aux\n"); 1633 return ret; 1634 } 1635 1636 /* Now that initialisation is complete, enable interrupts. */ 1637 zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_ALL); 1638 1639 return 0; 1640 } 1641 1642 int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub, struct drm_device *drm) 1643 { 1644 struct platform_device *pdev = to_platform_device(dpsub->dev); 1645 struct zynqmp_dp *dp; 1646 struct resource *res; 1647 int ret; 1648 1649 dp = drmm_kzalloc(drm, sizeof(*dp), GFP_KERNEL); 1650 if (!dp) 1651 return -ENOMEM; 1652 1653 dp->dev = &pdev->dev; 1654 dp->dpsub = dpsub; 1655 dp->status = connector_status_disconnected; 1656 dp->drm = drm; 1657 1658 INIT_DELAYED_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func); 1659 1660 dpsub->dp = dp; 1661 1662 /* Acquire all resources (IOMEM, IRQ and PHYs). */ 1663 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dp"); 1664 dp->iomem = devm_ioremap_resource(dp->dev, res); 1665 if (IS_ERR(dp->iomem)) 1666 return PTR_ERR(dp->iomem); 1667 1668 dp->irq = platform_get_irq(pdev, 0); 1669 if (dp->irq < 0) 1670 return dp->irq; 1671 1672 dp->reset = devm_reset_control_get(dp->dev, NULL); 1673 if (IS_ERR(dp->reset)) { 1674 if (PTR_ERR(dp->reset) != -EPROBE_DEFER) 1675 dev_err(dp->dev, "failed to get reset: %ld\n", 1676 PTR_ERR(dp->reset)); 1677 return PTR_ERR(dp->reset); 1678 } 1679 1680 ret = zynqmp_dp_reset(dp, false); 1681 if (ret < 0) 1682 return ret; 1683 1684 ret = zynqmp_dp_phy_probe(dp); 1685 if (ret) 1686 goto err_reset; 1687 1688 /* Initialize the hardware. */ 1689 zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, 1690 ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL); 1691 zynqmp_dp_set(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET); 1692 zynqmp_dp_write(dp, ZYNQMP_DP_FORCE_SCRAMBLER_RESET, 1); 1693 zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0); 1694 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff); 1695 1696 ret = zynqmp_dp_phy_init(dp); 1697 if (ret) 1698 goto err_reset; 1699 1700 zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 1); 1701 1702 /* 1703 * Now that the hardware is initialized and won't generate spurious 1704 * interrupts, request the IRQ. 1705 */ 1706 ret = devm_request_threaded_irq(dp->dev, dp->irq, NULL, 1707 zynqmp_dp_irq_handler, IRQF_ONESHOT, 1708 dev_name(dp->dev), dp); 1709 if (ret < 0) 1710 goto err_phy_exit; 1711 1712 dev_dbg(dp->dev, "ZynqMP DisplayPort Tx probed with %u lanes\n", 1713 dp->num_lanes); 1714 1715 return 0; 1716 1717 err_phy_exit: 1718 zynqmp_dp_phy_exit(dp); 1719 err_reset: 1720 zynqmp_dp_reset(dp, true); 1721 1722 return ret; 1723 } 1724 1725 void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub) 1726 { 1727 struct zynqmp_dp *dp = dpsub->dp; 1728 1729 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_ALL); 1730 disable_irq(dp->irq); 1731 1732 cancel_delayed_work_sync(&dp->hpd_work); 1733 zynqmp_dp_aux_cleanup(dp); 1734 1735 zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0); 1736 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff); 1737 1738 zynqmp_dp_phy_exit(dp); 1739 zynqmp_dp_reset(dp, true); 1740 } 1741