Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 1 | /* |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 2 | * Copyright (c) 2012-2018, The Linux Foundation. All rights reserved. |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 and |
| 6 | * only version 2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | #define pr_fmt(fmt) "[drm-dp] %s: " fmt, __func__ |
| 16 | |
| 17 | #include <linux/delay.h> |
| 18 | |
| 19 | #include "dp_aux.h" |
| 20 | |
| 21 | #define DP_AUX_ENUM_STR(x) #x |
| 22 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 23 | enum { |
| 24 | DP_AUX_DATA_INDEX_WRITE = BIT(31), |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 25 | }; |
| 26 | |
| 27 | struct dp_aux_private { |
| 28 | struct device *dev; |
| 29 | struct dp_aux dp_aux; |
| 30 | struct dp_catalog_aux *catalog; |
Padmanabhan Komanduru | 2e9914b | 2017-08-04 20:51:31 +0530 | [diff] [blame] | 31 | struct dp_aux_cfg *cfg; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 32 | struct mutex mutex; |
| 33 | struct completion comp; |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 34 | struct drm_dp_aux drm_aux; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 35 | |
Padmanabhan Komanduru | 15e757d | 2017-05-24 04:07:31 -0700 | [diff] [blame] | 36 | bool cmd_busy; |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 37 | bool native; |
| 38 | bool read; |
Tatenda Chipeperekwa | 35eafc1 | 2017-02-17 22:30:34 -0800 | [diff] [blame] | 39 | bool no_send_addr; |
| 40 | bool no_send_stop; |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 41 | |
Tatenda Chipeperekwa | 1a43e70 | 2017-09-15 15:45:16 -0700 | [diff] [blame] | 42 | u32 offset; |
| 43 | u32 segment; |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 44 | u32 aux_error_num; |
| 45 | u32 retry_cnt; |
| 46 | |
Padmanabhan Komanduru | ece783d | 2017-10-11 19:50:01 +0530 | [diff] [blame] | 47 | atomic_t aborted; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 48 | |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 49 | u8 *dpcd; |
| 50 | u8 *edid; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 51 | }; |
| 52 | |
Samantha Tran | b6a5cd8 | 2018-02-01 14:47:16 -0800 | [diff] [blame] | 53 | #ifdef CONFIG_DYNAMIC_DEBUG |
| 54 | static void dp_aux_hex_dump(struct drm_dp_aux *drm_aux, |
| 55 | struct drm_dp_aux_msg *msg) |
| 56 | { |
| 57 | DEFINE_DYNAMIC_DEBUG_METADATA(ddm, "dp aux tracker"); |
| 58 | |
| 59 | if (unlikely(ddm.flags & _DPRINTK_FLAGS_PRINT)) { |
| 60 | u8 buf[SZ_64]; |
| 61 | struct dp_aux_private *aux = container_of(drm_aux, |
| 62 | struct dp_aux_private, drm_aux); |
| 63 | |
| 64 | snprintf(buf, SZ_64, "[drm-dp] %5s %5s %5xh(%2zu): ", |
| 65 | aux->native ? "NATIVE" : "I2C", |
| 66 | aux->read ? "READ" : "WRITE", |
| 67 | msg->address, msg->size); |
| 68 | |
| 69 | print_hex_dump(KERN_DEBUG, buf, DUMP_PREFIX_NONE, |
| 70 | 8, 1, msg->buffer, msg->size, false); |
| 71 | } |
| 72 | } |
| 73 | #else |
| 74 | static void dp_aux_hex_dump(struct drm_dp_aux *drm_aux, |
| 75 | struct drm_dp_aux_msg *msg) |
| 76 | { |
| 77 | } |
| 78 | #endif |
| 79 | |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 80 | static char *dp_aux_get_error(u32 aux_error) |
| 81 | { |
| 82 | switch (aux_error) { |
| 83 | case DP_AUX_ERR_NONE: |
| 84 | return DP_AUX_ENUM_STR(DP_AUX_ERR_NONE); |
| 85 | case DP_AUX_ERR_ADDR: |
| 86 | return DP_AUX_ENUM_STR(DP_AUX_ERR_ADDR); |
| 87 | case DP_AUX_ERR_TOUT: |
| 88 | return DP_AUX_ENUM_STR(DP_AUX_ERR_TOUT); |
| 89 | case DP_AUX_ERR_NACK: |
| 90 | return DP_AUX_ENUM_STR(DP_AUX_ERR_NACK); |
| 91 | case DP_AUX_ERR_DEFER: |
| 92 | return DP_AUX_ENUM_STR(DP_AUX_ERR_DEFER); |
| 93 | case DP_AUX_ERR_NACK_DEFER: |
| 94 | return DP_AUX_ENUM_STR(DP_AUX_ERR_NACK_DEFER); |
| 95 | default: |
| 96 | return "unknown"; |
| 97 | } |
| 98 | } |
| 99 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 100 | static u32 dp_aux_write(struct dp_aux_private *aux, |
| 101 | struct drm_dp_aux_msg *msg) |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 102 | { |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 103 | u32 data[4], reg, len; |
| 104 | u8 *msgdata = msg->buffer; |
| 105 | int const aux_cmd_fifo_len = 128; |
| 106 | int i = 0; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 107 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 108 | if (aux->read) |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 109 | len = 4; |
| 110 | else |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 111 | len = msg->size + 4; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 112 | |
| 113 | /* |
| 114 | * cmd fifo only has depth of 144 bytes |
| 115 | * limit buf length to 128 bytes here |
| 116 | */ |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 117 | if (len > aux_cmd_fifo_len) { |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 118 | pr_err("buf len error\n"); |
| 119 | return 0; |
| 120 | } |
| 121 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 122 | /* Pack cmd and write to HW */ |
| 123 | data[0] = (msg->address >> 16) & 0xf; /* addr[19:16] */ |
| 124 | if (aux->read) |
| 125 | data[0] |= BIT(4); /* R/W */ |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 126 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 127 | data[1] = (msg->address >> 8) & 0xff; /* addr[15:8] */ |
| 128 | data[2] = msg->address & 0xff; /* addr[7:0] */ |
| 129 | data[3] = (msg->size - 1) & 0xff; /* len[7:0] */ |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 130 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 131 | for (i = 0; i < len; i++) { |
| 132 | reg = (i < 4) ? data[i] : msgdata[i - 4]; |
| 133 | reg = ((reg) << 8) & 0x0000ff00; /* index = 0, write */ |
| 134 | if (i == 0) |
| 135 | reg |= DP_AUX_DATA_INDEX_WRITE; |
| 136 | aux->catalog->data = reg; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 137 | aux->catalog->write_data(aux->catalog); |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 138 | } |
| 139 | |
Tatenda Chipeperekwa | 1a43e70 | 2017-09-15 15:45:16 -0700 | [diff] [blame] | 140 | aux->catalog->clear_trans(aux->catalog, false); |
Padmanabhan Komanduru | f69e357 | 2017-09-27 20:39:32 +0530 | [diff] [blame] | 141 | aux->catalog->clear_hw_interrupts(aux->catalog); |
Tatenda Chipeperekwa | 1a43e70 | 2017-09-15 15:45:16 -0700 | [diff] [blame] | 142 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 143 | reg = 0; /* Transaction number == 1 */ |
Tatenda Chipeperekwa | 35eafc1 | 2017-02-17 22:30:34 -0800 | [diff] [blame] | 144 | if (!aux->native) { /* i2c */ |
| 145 | reg |= BIT(8); |
| 146 | |
| 147 | if (aux->no_send_addr) |
| 148 | reg |= BIT(10); |
| 149 | |
| 150 | if (aux->no_send_stop) |
| 151 | reg |= BIT(11); |
| 152 | } |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 153 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 154 | reg |= BIT(9); |
| 155 | aux->catalog->data = reg; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 156 | aux->catalog->write_trans(aux->catalog); |
| 157 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 158 | return len; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 159 | } |
| 160 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 161 | static int dp_aux_cmd_fifo_tx(struct dp_aux_private *aux, |
| 162 | struct drm_dp_aux_msg *msg) |
| 163 | { |
| 164 | u32 ret = 0, len = 0, timeout; |
| 165 | int const aux_timeout_ms = HZ/4; |
| 166 | |
| 167 | reinit_completion(&aux->comp); |
| 168 | |
| 169 | len = dp_aux_write(aux, msg); |
| 170 | if (len == 0) { |
| 171 | pr_err("DP AUX write failed\n"); |
| 172 | return -EINVAL; |
| 173 | } |
| 174 | |
| 175 | timeout = wait_for_completion_timeout(&aux->comp, aux_timeout_ms); |
| 176 | if (!timeout) { |
Padmanabhan Komanduru | 2e9914b | 2017-08-04 20:51:31 +0530 | [diff] [blame] | 177 | pr_err("aux %s timeout\n", (aux->read ? "read" : "write")); |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 178 | return -ETIMEDOUT; |
| 179 | } |
| 180 | |
Ajay Singh Parmar | f63dbc7ab | 2017-07-02 22:45:28 -0700 | [diff] [blame] | 181 | if (aux->aux_error_num == DP_AUX_ERR_NONE) { |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 182 | ret = len; |
Ajay Singh Parmar | f63dbc7ab | 2017-07-02 22:45:28 -0700 | [diff] [blame] | 183 | } else { |
| 184 | pr_err_ratelimited("aux err: %s\n", |
| 185 | dp_aux_get_error(aux->aux_error_num)); |
| 186 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 187 | ret = -EINVAL; |
Ajay Singh Parmar | f63dbc7ab | 2017-07-02 22:45:28 -0700 | [diff] [blame] | 188 | } |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 189 | |
| 190 | return ret; |
| 191 | } |
| 192 | |
| 193 | static void dp_aux_cmd_fifo_rx(struct dp_aux_private *aux, |
| 194 | struct drm_dp_aux_msg *msg) |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 195 | { |
| 196 | u32 data; |
| 197 | u8 *dp; |
Tatenda Chipeperekwa | 35eafc1 | 2017-02-17 22:30:34 -0800 | [diff] [blame] | 198 | u32 i, actual_i; |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 199 | u32 len = msg->size; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 200 | |
Tatenda Chipeperekwa | 1a43e70 | 2017-09-15 15:45:16 -0700 | [diff] [blame] | 201 | aux->catalog->clear_trans(aux->catalog, true); |
| 202 | |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 203 | data = 0; |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 204 | data |= DP_AUX_DATA_INDEX_WRITE; /* INDEX_WRITE */ |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 205 | data |= BIT(0); /* read */ |
| 206 | |
| 207 | aux->catalog->data = data; |
| 208 | aux->catalog->write_data(aux->catalog); |
| 209 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 210 | dp = msg->buffer; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 211 | |
| 212 | /* discard first byte */ |
| 213 | data = aux->catalog->read_data(aux->catalog); |
| 214 | |
| 215 | for (i = 0; i < len; i++) { |
| 216 | data = aux->catalog->read_data(aux->catalog); |
| 217 | *dp++ = (u8)((data >> 8) & 0xff); |
Tatenda Chipeperekwa | 35eafc1 | 2017-02-17 22:30:34 -0800 | [diff] [blame] | 218 | |
| 219 | actual_i = (data >> 16) & 0xFF; |
| 220 | if (i != actual_i) |
| 221 | pr_warn("Index mismatch: expected %d, found %d\n", |
| 222 | i, actual_i); |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 223 | } |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 224 | } |
| 225 | |
| 226 | static void dp_aux_native_handler(struct dp_aux_private *aux) |
| 227 | { |
Padmanabhan Komanduru | 15e757d | 2017-05-24 04:07:31 -0700 | [diff] [blame] | 228 | u32 isr = aux->catalog->isr; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 229 | |
| 230 | if (isr & DP_INTR_AUX_I2C_DONE) |
| 231 | aux->aux_error_num = DP_AUX_ERR_NONE; |
| 232 | else if (isr & DP_INTR_WRONG_ADDR) |
| 233 | aux->aux_error_num = DP_AUX_ERR_ADDR; |
| 234 | else if (isr & DP_INTR_TIMEOUT) |
| 235 | aux->aux_error_num = DP_AUX_ERR_TOUT; |
| 236 | if (isr & DP_INTR_NACK_DEFER) |
| 237 | aux->aux_error_num = DP_AUX_ERR_NACK; |
Padmanabhan Komanduru | f69e357 | 2017-09-27 20:39:32 +0530 | [diff] [blame] | 238 | if (isr & DP_INTR_AUX_ERROR) { |
| 239 | aux->aux_error_num = DP_AUX_ERR_PHY; |
| 240 | aux->catalog->clear_hw_interrupts(aux->catalog); |
| 241 | } |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 242 | |
| 243 | complete(&aux->comp); |
| 244 | } |
| 245 | |
| 246 | static void dp_aux_i2c_handler(struct dp_aux_private *aux) |
| 247 | { |
Padmanabhan Komanduru | 15e757d | 2017-05-24 04:07:31 -0700 | [diff] [blame] | 248 | u32 isr = aux->catalog->isr; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 249 | |
| 250 | if (isr & DP_INTR_AUX_I2C_DONE) { |
| 251 | if (isr & (DP_INTR_I2C_NACK | DP_INTR_I2C_DEFER)) |
| 252 | aux->aux_error_num = DP_AUX_ERR_NACK; |
| 253 | else |
| 254 | aux->aux_error_num = DP_AUX_ERR_NONE; |
| 255 | } else { |
| 256 | if (isr & DP_INTR_WRONG_ADDR) |
| 257 | aux->aux_error_num = DP_AUX_ERR_ADDR; |
| 258 | else if (isr & DP_INTR_TIMEOUT) |
| 259 | aux->aux_error_num = DP_AUX_ERR_TOUT; |
| 260 | if (isr & DP_INTR_NACK_DEFER) |
| 261 | aux->aux_error_num = DP_AUX_ERR_NACK_DEFER; |
| 262 | if (isr & DP_INTR_I2C_NACK) |
| 263 | aux->aux_error_num = DP_AUX_ERR_NACK; |
| 264 | if (isr & DP_INTR_I2C_DEFER) |
| 265 | aux->aux_error_num = DP_AUX_ERR_DEFER; |
Padmanabhan Komanduru | f69e357 | 2017-09-27 20:39:32 +0530 | [diff] [blame] | 266 | if (isr & DP_INTR_AUX_ERROR) { |
| 267 | aux->aux_error_num = DP_AUX_ERR_PHY; |
| 268 | aux->catalog->clear_hw_interrupts(aux->catalog); |
| 269 | } |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 270 | } |
| 271 | |
| 272 | complete(&aux->comp); |
| 273 | } |
| 274 | |
| 275 | static void dp_aux_isr(struct dp_aux *dp_aux) |
| 276 | { |
| 277 | struct dp_aux_private *aux; |
| 278 | |
| 279 | if (!dp_aux) { |
| 280 | pr_err("invalid input\n"); |
| 281 | return; |
| 282 | } |
| 283 | |
| 284 | aux = container_of(dp_aux, struct dp_aux_private, dp_aux); |
| 285 | |
Padmanabhan Komanduru | 15e757d | 2017-05-24 04:07:31 -0700 | [diff] [blame] | 286 | aux->catalog->get_irq(aux->catalog, aux->cmd_busy); |
| 287 | |
| 288 | if (!aux->cmd_busy) |
| 289 | return; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 290 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 291 | if (aux->native) |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 292 | dp_aux_native_handler(aux); |
| 293 | else |
| 294 | dp_aux_i2c_handler(aux); |
| 295 | } |
| 296 | |
Padmanabhan Komanduru | 2e9914b | 2017-08-04 20:51:31 +0530 | [diff] [blame] | 297 | static void dp_aux_reconfig(struct dp_aux *dp_aux) |
| 298 | { |
| 299 | struct dp_aux_private *aux; |
| 300 | |
| 301 | if (!dp_aux) { |
| 302 | pr_err("invalid input\n"); |
| 303 | return; |
| 304 | } |
| 305 | |
| 306 | aux = container_of(dp_aux, struct dp_aux_private, dp_aux); |
| 307 | |
| 308 | aux->catalog->update_aux_cfg(aux->catalog, |
| 309 | aux->cfg, PHY_AUX_CFG1); |
| 310 | aux->catalog->reset(aux->catalog); |
| 311 | } |
| 312 | |
Padmanabhan Komanduru | ece783d | 2017-10-11 19:50:01 +0530 | [diff] [blame] | 313 | static void dp_aux_abort_transaction(struct dp_aux *dp_aux) |
| 314 | { |
| 315 | struct dp_aux_private *aux; |
| 316 | |
| 317 | if (!dp_aux) { |
| 318 | pr_err("invalid input\n"); |
| 319 | return; |
| 320 | } |
| 321 | |
| 322 | aux = container_of(dp_aux, struct dp_aux_private, dp_aux); |
| 323 | |
| 324 | atomic_set(&aux->aborted, 1); |
| 325 | } |
| 326 | |
Tatenda Chipeperekwa | 1a43e70 | 2017-09-15 15:45:16 -0700 | [diff] [blame] | 327 | static void dp_aux_update_offset_and_segment(struct dp_aux_private *aux, |
| 328 | struct drm_dp_aux_msg *input_msg) |
| 329 | { |
| 330 | u32 const edid_address = 0x50; |
| 331 | u32 const segment_address = 0x30; |
| 332 | bool i2c_read = input_msg->request & |
| 333 | (DP_AUX_I2C_READ & DP_AUX_NATIVE_READ); |
| 334 | u8 *data = NULL; |
| 335 | |
| 336 | if (aux->native || i2c_read || ((input_msg->address != edid_address) && |
| 337 | (input_msg->address != segment_address))) |
| 338 | return; |
| 339 | |
| 340 | |
| 341 | data = input_msg->buffer; |
| 342 | if (input_msg->address == segment_address) |
| 343 | aux->segment = *data; |
| 344 | else |
| 345 | aux->offset = *data; |
| 346 | } |
| 347 | |
| 348 | /** |
| 349 | * dp_aux_transfer_helper() - helper function for EDID read transactions |
| 350 | * |
| 351 | * @aux: DP AUX private structure |
| 352 | * @input_msg: input message from DRM upstream APIs |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 353 | * @send_seg: send the seg to sink |
Tatenda Chipeperekwa | 1a43e70 | 2017-09-15 15:45:16 -0700 | [diff] [blame] | 354 | * |
| 355 | * return: void |
| 356 | * |
| 357 | * This helper function is used to fix EDID reads for non-compliant |
| 358 | * sinks that do not handle the i2c middle-of-transaction flag correctly. |
| 359 | */ |
| 360 | static void dp_aux_transfer_helper(struct dp_aux_private *aux, |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 361 | struct drm_dp_aux_msg *input_msg, bool send_seg) |
Tatenda Chipeperekwa | 1a43e70 | 2017-09-15 15:45:16 -0700 | [diff] [blame] | 362 | { |
| 363 | struct drm_dp_aux_msg helper_msg; |
| 364 | u32 const message_size = 0x10; |
| 365 | u32 const segment_address = 0x30; |
Padmanabhan Komanduru | 95fc2d89 | 2017-12-05 18:28:23 +0530 | [diff] [blame] | 366 | u32 const edid_block_length = 0x80; |
Tatenda Chipeperekwa | 1a43e70 | 2017-09-15 15:45:16 -0700 | [diff] [blame] | 367 | bool i2c_mot = input_msg->request & DP_AUX_I2C_MOT; |
| 368 | bool i2c_read = input_msg->request & |
| 369 | (DP_AUX_I2C_READ & DP_AUX_NATIVE_READ); |
| 370 | |
| 371 | if (!i2c_mot || !i2c_read || (input_msg->size == 0)) |
| 372 | return; |
| 373 | |
Padmanabhan Komanduru | 95fc2d89 | 2017-12-05 18:28:23 +0530 | [diff] [blame] | 374 | /* |
| 375 | * Sending the segment value and EDID offset will be performed |
| 376 | * from the DRM upstream EDID driver for each block. Avoid |
| 377 | * duplicate AUX transactions related to this while reading the |
| 378 | * first 16 bytes of each block. |
| 379 | */ |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 380 | if (!(aux->offset % edid_block_length) || !send_seg) |
Padmanabhan Komanduru | 95fc2d89 | 2017-12-05 18:28:23 +0530 | [diff] [blame] | 381 | goto end; |
| 382 | |
Tatenda Chipeperekwa | 1a43e70 | 2017-09-15 15:45:16 -0700 | [diff] [blame] | 383 | aux->read = false; |
| 384 | aux->cmd_busy = true; |
| 385 | aux->no_send_addr = true; |
| 386 | aux->no_send_stop = true; |
| 387 | |
| 388 | /* |
Padmanabhan Komanduru | 729c002 | 2017-11-09 17:17:08 +0530 | [diff] [blame] | 389 | * Send the segment address for i2c reads for segment > 0 and for which |
| 390 | * the middle-of-transaction flag is set. This is required to support |
| 391 | * EDID reads of more than 2 blocks as the segment address is reset to 0 |
Tatenda Chipeperekwa | 1a43e70 | 2017-09-15 15:45:16 -0700 | [diff] [blame] | 392 | * since we are overriding the middle-of-transaction flag for read |
| 393 | * transactions. |
| 394 | */ |
Padmanabhan Komanduru | 729c002 | 2017-11-09 17:17:08 +0530 | [diff] [blame] | 395 | if (aux->segment) { |
| 396 | memset(&helper_msg, 0, sizeof(helper_msg)); |
| 397 | helper_msg.address = segment_address; |
| 398 | helper_msg.buffer = &aux->segment; |
| 399 | helper_msg.size = 1; |
| 400 | dp_aux_cmd_fifo_tx(aux, &helper_msg); |
| 401 | } |
Tatenda Chipeperekwa | 1a43e70 | 2017-09-15 15:45:16 -0700 | [diff] [blame] | 402 | |
| 403 | /* |
| 404 | * Send the offset address for every i2c read in which the |
| 405 | * middle-of-transaction flag is set. This will ensure that the sink |
| 406 | * will update its read pointer and return the correct portion of the |
| 407 | * EDID buffer in the subsequent i2c read trasntion triggered in the |
| 408 | * native AUX transfer function. |
| 409 | */ |
| 410 | memset(&helper_msg, 0, sizeof(helper_msg)); |
| 411 | helper_msg.address = input_msg->address; |
| 412 | helper_msg.buffer = &aux->offset; |
| 413 | helper_msg.size = 1; |
| 414 | dp_aux_cmd_fifo_tx(aux, &helper_msg); |
Padmanabhan Komanduru | 95fc2d89 | 2017-12-05 18:28:23 +0530 | [diff] [blame] | 415 | end: |
Tatenda Chipeperekwa | 1a43e70 | 2017-09-15 15:45:16 -0700 | [diff] [blame] | 416 | aux->offset += message_size; |
| 417 | |
| 418 | if (aux->offset == 0x80 || aux->offset == 0x100) |
| 419 | aux->segment = 0x0; /* reset segment at end of block */ |
| 420 | } |
| 421 | |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 422 | static int dp_aux_transfer_ready(struct dp_aux_private *aux, |
| 423 | struct drm_dp_aux_msg *msg, bool send_seg) |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 424 | { |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 425 | int ret = 0; |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 426 | int const aux_cmd_native_max = 16; |
| 427 | int const aux_cmd_i2c_max = 128; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 428 | |
Padmanabhan Komanduru | ece783d | 2017-10-11 19:50:01 +0530 | [diff] [blame] | 429 | if (atomic_read(&aux->aborted)) { |
| 430 | ret = -ETIMEDOUT; |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 431 | goto error; |
Padmanabhan Komanduru | ece783d | 2017-10-11 19:50:01 +0530 | [diff] [blame] | 432 | } |
| 433 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 434 | aux->native = msg->request & (DP_AUX_NATIVE_WRITE & DP_AUX_NATIVE_READ); |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 435 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 436 | /* Ignore address only message */ |
| 437 | if ((msg->size == 0) || (msg->buffer == NULL)) { |
| 438 | msg->reply = aux->native ? |
| 439 | DP_AUX_NATIVE_REPLY_ACK : DP_AUX_I2C_REPLY_ACK; |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 440 | goto error; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 441 | } |
| 442 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 443 | /* msg sanity check */ |
| 444 | if ((aux->native && (msg->size > aux_cmd_native_max)) || |
| 445 | (msg->size > aux_cmd_i2c_max)) { |
| 446 | pr_err("%s: invalid msg: size(%zu), request(%x)\n", |
| 447 | __func__, msg->size, msg->request); |
| 448 | ret = -EINVAL; |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 449 | goto error; |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 450 | } |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 451 | |
Tatenda Chipeperekwa | 1a43e70 | 2017-09-15 15:45:16 -0700 | [diff] [blame] | 452 | dp_aux_update_offset_and_segment(aux, msg); |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 453 | |
| 454 | dp_aux_transfer_helper(aux, msg, send_seg); |
Tatenda Chipeperekwa | 1a43e70 | 2017-09-15 15:45:16 -0700 | [diff] [blame] | 455 | |
| 456 | aux->read = msg->request & (DP_AUX_I2C_READ & DP_AUX_NATIVE_READ); |
Tatenda Chipeperekwa | 1a43e70 | 2017-09-15 15:45:16 -0700 | [diff] [blame] | 457 | |
Tatenda Chipeperekwa | 35eafc1 | 2017-02-17 22:30:34 -0800 | [diff] [blame] | 458 | if (aux->read) { |
| 459 | aux->no_send_addr = true; |
| 460 | aux->no_send_stop = false; |
| 461 | } else { |
| 462 | aux->no_send_addr = true; |
| 463 | aux->no_send_stop = true; |
| 464 | } |
| 465 | |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 466 | aux->cmd_busy = true; |
| 467 | error: |
| 468 | return ret; |
| 469 | } |
| 470 | |
| 471 | static ssize_t dp_aux_transfer_debug(struct drm_dp_aux *drm_aux, |
| 472 | struct drm_dp_aux_msg *msg) |
| 473 | { |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 474 | u32 timeout; |
| 475 | ssize_t ret; |
| 476 | struct dp_aux_private *aux = container_of(drm_aux, |
| 477 | struct dp_aux_private, drm_aux); |
| 478 | |
| 479 | ret = dp_aux_transfer_ready(aux, msg, false); |
| 480 | if (ret) |
| 481 | goto end; |
| 482 | |
| 483 | aux->aux_error_num = DP_AUX_ERR_NONE; |
| 484 | |
| 485 | if (aux->native) { |
| 486 | if (aux->read && ((msg->address + msg->size) < SZ_1K)) { |
| 487 | aux->dp_aux.reg = msg->address; |
| 488 | |
| 489 | reinit_completion(&aux->comp); |
| 490 | timeout = wait_for_completion_timeout(&aux->comp, HZ); |
| 491 | if (!timeout) |
| 492 | pr_err("aux timeout for 0x%x\n", msg->address); |
| 493 | |
| 494 | aux->dp_aux.reg = 0xFFFF; |
| 495 | |
| 496 | memcpy(msg->buffer, aux->dpcd + msg->address, |
| 497 | msg->size); |
| 498 | aux->aux_error_num = DP_AUX_ERR_NONE; |
| 499 | } else { |
| 500 | memset(msg->buffer, 0, msg->size); |
| 501 | } |
| 502 | } else { |
| 503 | if (aux->read && msg->address == 0x50) { |
| 504 | memcpy(msg->buffer, |
| 505 | aux->edid + aux->offset - 16, |
| 506 | msg->size); |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | if (aux->aux_error_num == DP_AUX_ERR_NONE) { |
Samantha Tran | b6a5cd8 | 2018-02-01 14:47:16 -0800 | [diff] [blame] | 511 | dp_aux_hex_dump(drm_aux, msg); |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 512 | |
| 513 | msg->reply = aux->native ? |
| 514 | DP_AUX_NATIVE_REPLY_ACK : DP_AUX_I2C_REPLY_ACK; |
| 515 | } else { |
| 516 | /* Reply defer to retry */ |
| 517 | msg->reply = aux->native ? |
| 518 | DP_AUX_NATIVE_REPLY_DEFER : DP_AUX_I2C_REPLY_DEFER; |
| 519 | } |
| 520 | |
| 521 | ret = msg->size; |
| 522 | end: |
| 523 | return ret; |
| 524 | } |
| 525 | |
| 526 | /* |
| 527 | * This function does the real job to process an AUX transaction. |
| 528 | * It will call aux_reset() function to reset the AUX channel, |
| 529 | * if the waiting is timeout. |
| 530 | */ |
| 531 | static ssize_t dp_aux_transfer(struct drm_dp_aux *drm_aux, |
| 532 | struct drm_dp_aux_msg *msg) |
| 533 | { |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 534 | ssize_t ret; |
| 535 | int const retry_count = 5; |
| 536 | struct dp_aux_private *aux = container_of(drm_aux, |
| 537 | struct dp_aux_private, drm_aux); |
| 538 | |
| 539 | mutex_lock(&aux->mutex); |
| 540 | |
| 541 | ret = dp_aux_transfer_ready(aux, msg, true); |
| 542 | if (ret) |
| 543 | goto unlock_exit; |
| 544 | |
| 545 | if (!aux->cmd_busy) { |
| 546 | ret = msg->size; |
| 547 | goto unlock_exit; |
| 548 | } |
| 549 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 550 | ret = dp_aux_cmd_fifo_tx(aux, msg); |
Padmanabhan Komanduru | ece783d | 2017-10-11 19:50:01 +0530 | [diff] [blame] | 551 | if ((ret < 0) && aux->native && !atomic_read(&aux->aborted)) { |
Padmanabhan Komanduru | 2e9914b | 2017-08-04 20:51:31 +0530 | [diff] [blame] | 552 | aux->retry_cnt++; |
| 553 | if (!(aux->retry_cnt % retry_count)) |
| 554 | aux->catalog->update_aux_cfg(aux->catalog, |
| 555 | aux->cfg, PHY_AUX_CFG1); |
| 556 | aux->catalog->reset(aux->catalog); |
| 557 | goto unlock_exit; |
| 558 | } else if (ret < 0) { |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 559 | goto unlock_exit; |
| 560 | } |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 561 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 562 | if (aux->aux_error_num == DP_AUX_ERR_NONE) { |
| 563 | if (aux->read) |
| 564 | dp_aux_cmd_fifo_rx(aux, msg); |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 565 | |
Samantha Tran | b6a5cd8 | 2018-02-01 14:47:16 -0800 | [diff] [blame] | 566 | dp_aux_hex_dump(drm_aux, msg); |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 567 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 568 | msg->reply = aux->native ? |
| 569 | DP_AUX_NATIVE_REPLY_ACK : DP_AUX_I2C_REPLY_ACK; |
| 570 | } else { |
| 571 | /* Reply defer to retry */ |
| 572 | msg->reply = aux->native ? |
| 573 | DP_AUX_NATIVE_REPLY_DEFER : DP_AUX_I2C_REPLY_DEFER; |
| 574 | } |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 575 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 576 | /* Return requested size for success or retry */ |
| 577 | ret = msg->size; |
Padmanabhan Komanduru | 2e9914b | 2017-08-04 20:51:31 +0530 | [diff] [blame] | 578 | aux->retry_cnt = 0; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 579 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 580 | unlock_exit: |
Padmanabhan Komanduru | 15e757d | 2017-05-24 04:07:31 -0700 | [diff] [blame] | 581 | aux->cmd_busy = false; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 582 | mutex_unlock(&aux->mutex); |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 583 | return ret; |
| 584 | } |
| 585 | |
Padmanabhan Komanduru | 20a21db | 2017-07-10 16:58:59 +0530 | [diff] [blame] | 586 | static void dp_aux_reset_phy_config_indices(struct dp_aux_cfg *aux_cfg) |
| 587 | { |
| 588 | int i = 0; |
| 589 | |
| 590 | for (i = 0; i < PHY_AUX_CFG_MAX; i++) |
| 591 | aux_cfg[i].current_index = 0; |
| 592 | } |
| 593 | |
| 594 | static void dp_aux_init(struct dp_aux *dp_aux, struct dp_aux_cfg *aux_cfg) |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 595 | { |
| 596 | struct dp_aux_private *aux; |
| 597 | |
Padmanabhan Komanduru | 20a21db | 2017-07-10 16:58:59 +0530 | [diff] [blame] | 598 | if (!dp_aux || !aux_cfg) { |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 599 | pr_err("invalid input\n"); |
| 600 | return; |
| 601 | } |
| 602 | |
| 603 | aux = container_of(dp_aux, struct dp_aux_private, dp_aux); |
| 604 | |
Padmanabhan Komanduru | f69e357 | 2017-09-27 20:39:32 +0530 | [diff] [blame] | 605 | dp_aux_reset_phy_config_indices(aux_cfg); |
| 606 | aux->catalog->setup(aux->catalog, aux_cfg); |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 607 | aux->catalog->reset(aux->catalog); |
| 608 | aux->catalog->enable(aux->catalog, true); |
Padmanabhan Komanduru | ece783d | 2017-10-11 19:50:01 +0530 | [diff] [blame] | 609 | atomic_set(&aux->aborted, 0); |
Padmanabhan Komanduru | 2e9914b | 2017-08-04 20:51:31 +0530 | [diff] [blame] | 610 | aux->retry_cnt = 0; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 611 | } |
| 612 | |
| 613 | static void dp_aux_deinit(struct dp_aux *dp_aux) |
| 614 | { |
| 615 | struct dp_aux_private *aux; |
| 616 | |
| 617 | if (!dp_aux) { |
| 618 | pr_err("invalid input\n"); |
| 619 | return; |
| 620 | } |
| 621 | |
| 622 | aux = container_of(dp_aux, struct dp_aux_private, dp_aux); |
| 623 | |
Padmanabhan Komanduru | ece783d | 2017-10-11 19:50:01 +0530 | [diff] [blame] | 624 | atomic_set(&aux->aborted, 1); |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 625 | aux->catalog->enable(aux->catalog, false); |
| 626 | } |
| 627 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 628 | static int dp_aux_register(struct dp_aux *dp_aux) |
| 629 | { |
| 630 | struct dp_aux_private *aux; |
| 631 | int ret = 0; |
| 632 | |
| 633 | if (!dp_aux) { |
| 634 | pr_err("invalid input\n"); |
| 635 | ret = -EINVAL; |
| 636 | goto exit; |
| 637 | } |
| 638 | |
| 639 | aux = container_of(dp_aux, struct dp_aux_private, dp_aux); |
| 640 | |
| 641 | aux->drm_aux.name = "sde_dp_aux"; |
| 642 | aux->drm_aux.dev = aux->dev; |
| 643 | aux->drm_aux.transfer = dp_aux_transfer; |
| 644 | ret = drm_dp_aux_register(&aux->drm_aux); |
| 645 | if (ret) { |
| 646 | pr_err("%s: failed to register drm aux: %d\n", __func__, ret); |
| 647 | goto exit; |
| 648 | } |
| 649 | dp_aux->drm_aux = &aux->drm_aux; |
| 650 | exit: |
| 651 | return ret; |
| 652 | } |
| 653 | |
| 654 | static void dp_aux_deregister(struct dp_aux *dp_aux) |
| 655 | { |
| 656 | struct dp_aux_private *aux; |
| 657 | |
| 658 | if (!dp_aux) { |
| 659 | pr_err("invalid input\n"); |
| 660 | return; |
| 661 | } |
| 662 | |
| 663 | aux = container_of(dp_aux, struct dp_aux_private, dp_aux); |
| 664 | drm_dp_aux_unregister(&aux->drm_aux); |
| 665 | } |
| 666 | |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 667 | static void dp_aux_dpcd_updated(struct dp_aux *dp_aux) |
| 668 | { |
| 669 | struct dp_aux_private *aux; |
| 670 | |
| 671 | if (!dp_aux) { |
| 672 | pr_err("invalid input\n"); |
| 673 | return; |
| 674 | } |
| 675 | |
| 676 | aux = container_of(dp_aux, struct dp_aux_private, dp_aux); |
| 677 | |
| 678 | complete(&aux->comp); |
| 679 | } |
| 680 | |
| 681 | static void dp_aux_set_sim_mode(struct dp_aux *dp_aux, bool en, |
| 682 | u8 *edid, u8 *dpcd) |
| 683 | { |
| 684 | struct dp_aux_private *aux; |
| 685 | |
| 686 | if (!dp_aux) { |
| 687 | pr_err("invalid input\n"); |
| 688 | return; |
| 689 | } |
| 690 | |
| 691 | aux = container_of(dp_aux, struct dp_aux_private, dp_aux); |
| 692 | |
| 693 | aux->edid = edid; |
| 694 | aux->dpcd = dpcd; |
| 695 | |
| 696 | if (en) |
| 697 | aux->drm_aux.transfer = dp_aux_transfer_debug; |
| 698 | else |
| 699 | aux->drm_aux.transfer = dp_aux_transfer; |
| 700 | } |
| 701 | |
Padmanabhan Komanduru | 2e9914b | 2017-08-04 20:51:31 +0530 | [diff] [blame] | 702 | struct dp_aux *dp_aux_get(struct device *dev, struct dp_catalog_aux *catalog, |
| 703 | struct dp_aux_cfg *aux_cfg) |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 704 | { |
| 705 | int rc = 0; |
| 706 | struct dp_aux_private *aux; |
| 707 | struct dp_aux *dp_aux; |
| 708 | |
Padmanabhan Komanduru | 2e9914b | 2017-08-04 20:51:31 +0530 | [diff] [blame] | 709 | if (!catalog || !aux_cfg) { |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 710 | pr_err("invalid input\n"); |
| 711 | rc = -ENODEV; |
| 712 | goto error; |
| 713 | } |
| 714 | |
| 715 | aux = devm_kzalloc(dev, sizeof(*aux), GFP_KERNEL); |
| 716 | if (!aux) { |
| 717 | rc = -ENOMEM; |
| 718 | goto error; |
| 719 | } |
| 720 | |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 721 | init_completion(&aux->comp); |
| 722 | aux->cmd_busy = false; |
| 723 | mutex_init(&aux->mutex); |
| 724 | |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 725 | aux->dev = dev; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 726 | aux->catalog = catalog; |
Padmanabhan Komanduru | 2e9914b | 2017-08-04 20:51:31 +0530 | [diff] [blame] | 727 | aux->cfg = aux_cfg; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 728 | dp_aux = &aux->dp_aux; |
Padmanabhan Komanduru | 2e9914b | 2017-08-04 20:51:31 +0530 | [diff] [blame] | 729 | aux->retry_cnt = 0; |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 730 | aux->dp_aux.reg = 0xFFFF; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 731 | |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 732 | dp_aux->isr = dp_aux_isr; |
| 733 | dp_aux->init = dp_aux_init; |
| 734 | dp_aux->deinit = dp_aux_deinit; |
Padmanabhan Komanduru | d84b38b | 2017-05-24 04:24:57 -0700 | [diff] [blame] | 735 | dp_aux->drm_aux_register = dp_aux_register; |
| 736 | dp_aux->drm_aux_deregister = dp_aux_deregister; |
Padmanabhan Komanduru | 2e9914b | 2017-08-04 20:51:31 +0530 | [diff] [blame] | 737 | dp_aux->reconfig = dp_aux_reconfig; |
Padmanabhan Komanduru | ece783d | 2017-10-11 19:50:01 +0530 | [diff] [blame] | 738 | dp_aux->abort = dp_aux_abort_transaction; |
Ajay Singh Parmar | 09e6af6 | 2018-01-19 17:56:21 -0800 | [diff] [blame] | 739 | dp_aux->dpcd_updated = dp_aux_dpcd_updated; |
| 740 | dp_aux->set_sim_mode = dp_aux_set_sim_mode; |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 741 | |
| 742 | return dp_aux; |
| 743 | error: |
| 744 | return ERR_PTR(rc); |
| 745 | } |
| 746 | |
| 747 | void dp_aux_put(struct dp_aux *dp_aux) |
| 748 | { |
| 749 | struct dp_aux_private *aux; |
| 750 | |
| 751 | if (!dp_aux) |
| 752 | return; |
| 753 | |
| 754 | aux = container_of(dp_aux, struct dp_aux_private, dp_aux); |
| 755 | |
Tatenda Chipeperekwa | 47ddbcd | 2017-08-30 13:43:21 -0700 | [diff] [blame] | 756 | mutex_destroy(&aux->mutex); |
| 757 | |
Ajay Singh Parmar | ae72562 | 2017-03-22 00:03:39 -0700 | [diff] [blame] | 758 | devm_kfree(aux->dev, aux); |
| 759 | } |