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/display/drm_dp_helper.h>
13 #include <drm/drm_atomic_helper.h>
14 #include <drm/drm_crtc.h>
15 #include <drm/drm_device.h>
16 #include <drm/drm_edid.h>
17 #include <drm/drm_fourcc.h>
18 #include <drm/drm_modes.h>
19 #include <drm/drm_of.h>
20
21 #include <linux/clk.h>
22 #include <linux/delay.h>
23 #include <linux/device.h>
24 #include <linux/io.h>
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
27 #include <linux/pm_runtime.h>
28 #include <linux/phy/phy.h>
29 #include <linux/reset.h>
30 #include <linux/slab.h>
31
32 #include "zynqmp_disp.h"
33 #include "zynqmp_dp.h"
34 #include "zynqmp_dpsub.h"
35 #include "zynqmp_kms.h"
36
37 static uint zynqmp_dp_aux_timeout_ms = 50;
38 module_param_named(aux_timeout_ms, zynqmp_dp_aux_timeout_ms, uint, 0444);
39 MODULE_PARM_DESC(aux_timeout_ms, "DP aux timeout value in msec (default: 50)");
40
41 /*
42 * Some sink requires a delay after power on request
43 */
44 static uint zynqmp_dp_power_on_delay_ms = 4;
45 module_param_named(power_on_delay_ms, zynqmp_dp_power_on_delay_ms, uint, 0444);
46 MODULE_PARM_DESC(power_on_delay_ms, "DP power on delay in msec (default: 4)");
47
48 /* Link configuration registers */
49 #define ZYNQMP_DP_LINK_BW_SET 0x0
50 #define ZYNQMP_DP_LANE_COUNT_SET 0x4
51 #define ZYNQMP_DP_ENHANCED_FRAME_EN 0x8
52 #define ZYNQMP_DP_TRAINING_PATTERN_SET 0xc
53 #define ZYNQMP_DP_SCRAMBLING_DISABLE 0x14
54 #define ZYNQMP_DP_DOWNSPREAD_CTL 0x18
55 #define ZYNQMP_DP_SOFTWARE_RESET 0x1c
56 #define ZYNQMP_DP_SOFTWARE_RESET_STREAM1 BIT(0)
57 #define ZYNQMP_DP_SOFTWARE_RESET_STREAM2 BIT(1)
58 #define ZYNQMP_DP_SOFTWARE_RESET_STREAM3 BIT(2)
59 #define ZYNQMP_DP_SOFTWARE_RESET_STREAM4 BIT(3)
60 #define ZYNQMP_DP_SOFTWARE_RESET_AUX BIT(7)
61 #define ZYNQMP_DP_SOFTWARE_RESET_ALL (ZYNQMP_DP_SOFTWARE_RESET_STREAM1 | \
62 ZYNQMP_DP_SOFTWARE_RESET_STREAM2 | \
63 ZYNQMP_DP_SOFTWARE_RESET_STREAM3 | \
64 ZYNQMP_DP_SOFTWARE_RESET_STREAM4 | \
65 ZYNQMP_DP_SOFTWARE_RESET_AUX)
66
67 /* Core enable registers */
68 #define ZYNQMP_DP_TRANSMITTER_ENABLE 0x80
69 #define ZYNQMP_DP_MAIN_STREAM_ENABLE 0x84
70 #define ZYNQMP_DP_FORCE_SCRAMBLER_RESET 0xc0
71 #define ZYNQMP_DP_VERSION 0xf8
72 #define ZYNQMP_DP_VERSION_MAJOR_MASK GENMASK(31, 24)
73 #define ZYNQMP_DP_VERSION_MAJOR_SHIFT 24
74 #define ZYNQMP_DP_VERSION_MINOR_MASK GENMASK(23, 16)
75 #define ZYNQMP_DP_VERSION_MINOR_SHIFT 16
76 #define ZYNQMP_DP_VERSION_REVISION_MASK GENMASK(15, 12)
77 #define ZYNQMP_DP_VERSION_REVISION_SHIFT 12
78 #define ZYNQMP_DP_VERSION_PATCH_MASK GENMASK(11, 8)
79 #define ZYNQMP_DP_VERSION_PATCH_SHIFT 8
80 #define ZYNQMP_DP_VERSION_INTERNAL_MASK GENMASK(7, 0)
81 #define ZYNQMP_DP_VERSION_INTERNAL_SHIFT 0
82
83 /* Core ID registers */
84 #define ZYNQMP_DP_CORE_ID 0xfc
85 #define ZYNQMP_DP_CORE_ID_MAJOR_MASK GENMASK(31, 24)
86 #define ZYNQMP_DP_CORE_ID_MAJOR_SHIFT 24
87 #define ZYNQMP_DP_CORE_ID_MINOR_MASK GENMASK(23, 16)
88 #define ZYNQMP_DP_CORE_ID_MINOR_SHIFT 16
89 #define ZYNQMP_DP_CORE_ID_REVISION_MASK GENMASK(15, 8)
90 #define ZYNQMP_DP_CORE_ID_REVISION_SHIFT 8
91 #define ZYNQMP_DP_CORE_ID_DIRECTION GENMASK(1)
92
93 /* AUX channel interface registers */
94 #define ZYNQMP_DP_AUX_COMMAND 0x100
95 #define ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT 8
96 #define ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY BIT(12)
97 #define ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT 0
98 #define ZYNQMP_DP_AUX_WRITE_FIFO 0x104
99 #define ZYNQMP_DP_AUX_ADDRESS 0x108
100 #define ZYNQMP_DP_AUX_CLK_DIVIDER 0x10c
101 #define ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT 8
102 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE 0x130
103 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD BIT(0)
104 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST BIT(1)
105 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY BIT(2)
106 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT BIT(3)
107 #define ZYNQMP_DP_AUX_REPLY_DATA 0x134
108 #define ZYNQMP_DP_AUX_REPLY_CODE 0x138
109 #define ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK (0)
110 #define ZYNQMP_DP_AUX_REPLY_CODE_AUX_NACK BIT(0)
111 #define ZYNQMP_DP_AUX_REPLY_CODE_AUX_DEFER BIT(1)
112 #define ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK (0)
113 #define ZYNQMP_DP_AUX_REPLY_CODE_I2C_NACK BIT(2)
114 #define ZYNQMP_DP_AUX_REPLY_CODE_I2C_DEFER BIT(3)
115 #define ZYNQMP_DP_AUX_REPLY_COUNT 0x13c
116 #define ZYNQMP_DP_REPLY_DATA_COUNT 0x148
117 #define ZYNQMP_DP_REPLY_DATA_COUNT_MASK 0xff
118 #define ZYNQMP_DP_INT_STATUS 0x3a0
119 #define ZYNQMP_DP_INT_MASK 0x3a4
120 #define ZYNQMP_DP_INT_EN 0x3a8
121 #define ZYNQMP_DP_INT_DS 0x3ac
122 #define ZYNQMP_DP_INT_HPD_IRQ BIT(0)
123 #define ZYNQMP_DP_INT_HPD_EVENT BIT(1)
124 #define ZYNQMP_DP_INT_REPLY_RECEIVED BIT(2)
125 #define ZYNQMP_DP_INT_REPLY_TIMEOUT BIT(3)
126 #define ZYNQMP_DP_INT_HPD_PULSE_DET BIT(4)
127 #define ZYNQMP_DP_INT_EXT_PKT_TXD BIT(5)
128 #define ZYNQMP_DP_INT_LIV_ABUF_UNDRFLW BIT(12)
129 #define ZYNQMP_DP_INT_VBLANK_START BIT(13)
130 #define ZYNQMP_DP_INT_PIXEL1_MATCH BIT(14)
131 #define ZYNQMP_DP_INT_PIXEL0_MATCH BIT(15)
132 #define ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK 0x3f0000
133 #define ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK 0xfc00000
134 #define ZYNQMP_DP_INT_CUST_TS_2 BIT(28)
135 #define ZYNQMP_DP_INT_CUST_TS BIT(29)
136 #define ZYNQMP_DP_INT_EXT_VSYNC_TS BIT(30)
137 #define ZYNQMP_DP_INT_VSYNC_TS BIT(31)
138 #define ZYNQMP_DP_INT_ALL (ZYNQMP_DP_INT_HPD_IRQ | \
139 ZYNQMP_DP_INT_HPD_EVENT | \
140 ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK | \
141 ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK)
142
143 /* Main stream attribute registers */
144 #define ZYNQMP_DP_MAIN_STREAM_HTOTAL 0x180
145 #define ZYNQMP_DP_MAIN_STREAM_VTOTAL 0x184
146 #define ZYNQMP_DP_MAIN_STREAM_POLARITY 0x188
147 #define ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT 0
148 #define ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT 1
149 #define ZYNQMP_DP_MAIN_STREAM_HSWIDTH 0x18c
150 #define ZYNQMP_DP_MAIN_STREAM_VSWIDTH 0x190
151 #define ZYNQMP_DP_MAIN_STREAM_HRES 0x194
152 #define ZYNQMP_DP_MAIN_STREAM_VRES 0x198
153 #define ZYNQMP_DP_MAIN_STREAM_HSTART 0x19c
154 #define ZYNQMP_DP_MAIN_STREAM_VSTART 0x1a0
155 #define ZYNQMP_DP_MAIN_STREAM_MISC0 0x1a4
156 #define ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK BIT(0)
157 #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB (0 << 1)
158 #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422 (5 << 1)
159 #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444 (6 << 1)
160 #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK (7 << 1)
161 #define ZYNQMP_DP_MAIN_STREAM_MISC0_DYNAMIC_RANGE BIT(3)
162 #define ZYNQMP_DP_MAIN_STREAM_MISC0_YCBCR_COLR BIT(4)
163 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6 (0 << 5)
164 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8 (1 << 5)
165 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10 (2 << 5)
166 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12 (3 << 5)
167 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16 (4 << 5)
168 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK (7 << 5)
169 #define ZYNQMP_DP_MAIN_STREAM_MISC1 0x1a8
170 #define ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN BIT(7)
171 #define ZYNQMP_DP_MAIN_STREAM_M_VID 0x1ac
172 #define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE 0x1b0
173 #define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF 64
174 #define ZYNQMP_DP_MAIN_STREAM_N_VID 0x1b4
175 #define ZYNQMP_DP_USER_PIX_WIDTH 0x1b8
176 #define ZYNQMP_DP_USER_DATA_COUNT_PER_LANE 0x1bc
177 #define ZYNQMP_DP_MIN_BYTES_PER_TU 0x1c4
178 #define ZYNQMP_DP_FRAC_BYTES_PER_TU 0x1c8
179 #define ZYNQMP_DP_INIT_WAIT 0x1cc
180
181 /* PHY configuration and status registers */
182 #define ZYNQMP_DP_PHY_RESET 0x200
183 #define ZYNQMP_DP_PHY_RESET_PHY_RESET BIT(0)
184 #define ZYNQMP_DP_PHY_RESET_GTTX_RESET BIT(1)
185 #define ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET BIT(8)
186 #define ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET BIT(9)
187 #define ZYNQMP_DP_PHY_RESET_ALL_RESET (ZYNQMP_DP_PHY_RESET_PHY_RESET | \
188 ZYNQMP_DP_PHY_RESET_GTTX_RESET | \
189 ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET | \
190 ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET)
191 #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_0 0x210
192 #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_1 0x214
193 #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_2 0x218
194 #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_3 0x21c
195 #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_0 0x220
196 #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_1 0x224
197 #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_2 0x228
198 #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_3 0x22c
199 #define ZYNQMP_DP_PHY_CLOCK_SELECT 0x234
200 #define ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G 0x1
201 #define ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G 0x3
202 #define ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G 0x5
203 #define ZYNQMP_DP_TX_PHY_POWER_DOWN 0x238
204 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_0 BIT(0)
205 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_1 BIT(1)
206 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_2 BIT(2)
207 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_3 BIT(3)
208 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL 0xf
209 #define ZYNQMP_DP_PHY_PRECURSOR_LANE_0 0x23c
210 #define ZYNQMP_DP_PHY_PRECURSOR_LANE_1 0x240
211 #define ZYNQMP_DP_PHY_PRECURSOR_LANE_2 0x244
212 #define ZYNQMP_DP_PHY_PRECURSOR_LANE_3 0x248
213 #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_0 0x24c
214 #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_1 0x250
215 #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_2 0x254
216 #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_3 0x258
217 #define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 0x24c
218 #define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_1 0x250
219 #define ZYNQMP_DP_PHY_STATUS 0x280
220 #define ZYNQMP_DP_PHY_STATUS_PLL_LOCKED_SHIFT 4
221 #define ZYNQMP_DP_PHY_STATUS_FPGA_PLL_LOCKED BIT(6)
222
223 /* Audio registers */
224 #define ZYNQMP_DP_TX_AUDIO_CONTROL 0x300
225 #define ZYNQMP_DP_TX_AUDIO_CHANNELS 0x304
226 #define ZYNQMP_DP_TX_AUDIO_INFO_DATA 0x308
227 #define ZYNQMP_DP_TX_M_AUD 0x328
228 #define ZYNQMP_DP_TX_N_AUD 0x32c
229 #define ZYNQMP_DP_TX_AUDIO_EXT_DATA 0x330
230
231 #define ZYNQMP_DP_MAX_LANES 2
232 #define ZYNQMP_MAX_FREQ 3000000
233
234 #define DP_REDUCED_BIT_RATE 162000
235 #define DP_HIGH_BIT_RATE 270000
236 #define DP_HIGH_BIT_RATE2 540000
237 #define DP_MAX_TRAINING_TRIES 5
238 #define DP_V1_2 0x12
239
240 /**
241 * struct zynqmp_dp_link_config - Common link config between source and sink
242 * @max_rate: maximum link rate
243 * @max_lanes: maximum number of lanes
244 */
245 struct zynqmp_dp_link_config {
246 int max_rate;
247 u8 max_lanes;
248 };
249
250 /**
251 * struct zynqmp_dp_mode - Configured mode of DisplayPort
252 * @bw_code: code for bandwidth(link rate)
253 * @lane_cnt: number of lanes
254 * @pclock: pixel clock frequency of current mode
255 * @fmt: format identifier string
256 */
257 struct zynqmp_dp_mode {
258 u8 bw_code;
259 u8 lane_cnt;
260 int pclock;
261 const char *fmt;
262 };
263
264 /**
265 * struct zynqmp_dp_config - Configuration of DisplayPort from DTS
266 * @misc0: misc0 configuration (per DP v1.2 spec)
267 * @misc1: misc1 configuration (per DP v1.2 spec)
268 * @bpp: bits per pixel
269 */
270 struct zynqmp_dp_config {
271 u8 misc0;
272 u8 misc1;
273 u8 bpp;
274 };
275
276 /**
277 * struct zynqmp_dp - Xilinx DisplayPort core
278 * @dev: device structure
279 * @dpsub: Display subsystem
280 * @iomem: device I/O memory for register access
281 * @reset: reset controller
282 * @irq: irq
283 * @bridge: DRM bridge for the DP encoder
284 * @next_bridge: The downstream bridge
285 * @config: IP core configuration from DTS
286 * @aux: aux channel
287 * @phy: PHY handles for DP lanes
288 * @num_lanes: number of enabled phy lanes
289 * @hpd_work: hot plug detection worker
290 * @status: connection status
291 * @enabled: flag to indicate if the device is enabled
292 * @dpcd: DP configuration data from currently connected sink device
293 * @link_config: common link configuration between IP core and sink device
294 * @mode: current mode between IP core and sink device
295 * @train_set: set of training data
296 */
297 struct zynqmp_dp {
298 struct device *dev;
299 struct zynqmp_dpsub *dpsub;
300 void __iomem *iomem;
301 struct reset_control *reset;
302 int irq;
303
304 struct drm_bridge bridge;
305 struct drm_bridge *next_bridge;
306
307 struct zynqmp_dp_config config;
308 struct drm_dp_aux aux;
309 struct phy *phy[ZYNQMP_DP_MAX_LANES];
310 u8 num_lanes;
311 struct delayed_work hpd_work;
312 enum drm_connector_status status;
313 bool enabled;
314
315 u8 dpcd[DP_RECEIVER_CAP_SIZE];
316 struct zynqmp_dp_link_config link_config;
317 struct zynqmp_dp_mode mode;
318 u8 train_set[ZYNQMP_DP_MAX_LANES];
319 };
320
bridge_to_dp(struct drm_bridge * bridge)321 static inline struct zynqmp_dp *bridge_to_dp(struct drm_bridge *bridge)
322 {
323 return container_of(bridge, struct zynqmp_dp, bridge);
324 }
325
zynqmp_dp_write(struct zynqmp_dp * dp,int offset,u32 val)326 static void zynqmp_dp_write(struct zynqmp_dp *dp, int offset, u32 val)
327 {
328 writel(val, dp->iomem + offset);
329 }
330
zynqmp_dp_read(struct zynqmp_dp * dp,int offset)331 static u32 zynqmp_dp_read(struct zynqmp_dp *dp, int offset)
332 {
333 return readl(dp->iomem + offset);
334 }
335
zynqmp_dp_clr(struct zynqmp_dp * dp,int offset,u32 clr)336 static void zynqmp_dp_clr(struct zynqmp_dp *dp, int offset, u32 clr)
337 {
338 zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) & ~clr);
339 }
340
zynqmp_dp_set(struct zynqmp_dp * dp,int offset,u32 set)341 static void zynqmp_dp_set(struct zynqmp_dp *dp, int offset, u32 set)
342 {
343 zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) | set);
344 }
345
346 /* -----------------------------------------------------------------------------
347 * PHY Handling
348 */
349
350 #define RST_TIMEOUT_MS 1000
351
zynqmp_dp_reset(struct zynqmp_dp * dp,bool assert)352 static int zynqmp_dp_reset(struct zynqmp_dp *dp, bool assert)
353 {
354 unsigned long timeout;
355
356 if (assert)
357 reset_control_assert(dp->reset);
358 else
359 reset_control_deassert(dp->reset);
360
361 /* Wait for the (de)assert to complete. */
362 timeout = jiffies + msecs_to_jiffies(RST_TIMEOUT_MS);
363 while (!time_after_eq(jiffies, timeout)) {
364 bool status = !!reset_control_status(dp->reset);
365
366 if (assert == status)
367 return 0;
368
369 cpu_relax();
370 }
371
372 dev_err(dp->dev, "reset %s timeout\n", assert ? "assert" : "deassert");
373 return -ETIMEDOUT;
374 }
375
376 /**
377 * zynqmp_dp_phy_init - Initialize the phy
378 * @dp: DisplayPort IP core structure
379 *
380 * Initialize the phy.
381 *
382 * Return: 0 if the phy instances are initialized correctly, or the error code
383 * returned from the callee functions.
384 */
zynqmp_dp_phy_init(struct zynqmp_dp * dp)385 static int zynqmp_dp_phy_init(struct zynqmp_dp *dp)
386 {
387 int ret;
388 int i;
389
390 for (i = 0; i < dp->num_lanes; i++) {
391 ret = phy_init(dp->phy[i]);
392 if (ret) {
393 dev_err(dp->dev, "failed to init phy lane %d\n", i);
394 return ret;
395 }
396 }
397
398 zynqmp_dp_clr(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET);
399
400 /*
401 * Power on lanes in reverse order as only lane 0 waits for the PLL to
402 * lock.
403 */
404 for (i = dp->num_lanes - 1; i >= 0; i--) {
405 ret = phy_power_on(dp->phy[i]);
406 if (ret) {
407 dev_err(dp->dev, "failed to power on phy lane %d\n", i);
408 return ret;
409 }
410 }
411
412 return 0;
413 }
414
415 /**
416 * zynqmp_dp_phy_exit - Exit the phy
417 * @dp: DisplayPort IP core structure
418 *
419 * Exit the phy.
420 */
zynqmp_dp_phy_exit(struct zynqmp_dp * dp)421 static void zynqmp_dp_phy_exit(struct zynqmp_dp *dp)
422 {
423 unsigned int i;
424 int ret;
425
426 for (i = 0; i < dp->num_lanes; i++) {
427 ret = phy_power_off(dp->phy[i]);
428 if (ret)
429 dev_err(dp->dev, "failed to power off phy(%d) %d\n", i,
430 ret);
431 }
432
433 for (i = 0; i < dp->num_lanes; i++) {
434 ret = phy_exit(dp->phy[i]);
435 if (ret)
436 dev_err(dp->dev, "failed to exit phy(%d) %d\n", i, ret);
437 }
438 }
439
440 /**
441 * zynqmp_dp_phy_probe - Probe the PHYs
442 * @dp: DisplayPort IP core structure
443 *
444 * Probe PHYs for all lanes. Less PHYs may be available than the number of
445 * lanes, which is not considered an error as long as at least one PHY is
446 * found. The caller can check dp->num_lanes to check how many PHYs were found.
447 *
448 * Return:
449 * * 0 - Success
450 * * -ENXIO - No PHY found
451 * * -EPROBE_DEFER - Probe deferral requested
452 * * Other negative value - PHY retrieval failure
453 */
zynqmp_dp_phy_probe(struct zynqmp_dp * dp)454 static int zynqmp_dp_phy_probe(struct zynqmp_dp *dp)
455 {
456 unsigned int i;
457
458 for (i = 0; i < ZYNQMP_DP_MAX_LANES; i++) {
459 char phy_name[16];
460 struct phy *phy;
461
462 snprintf(phy_name, sizeof(phy_name), "dp-phy%d", i);
463 phy = devm_phy_get(dp->dev, phy_name);
464
465 if (IS_ERR(phy)) {
466 switch (PTR_ERR(phy)) {
467 case -ENODEV:
468 if (dp->num_lanes)
469 return 0;
470
471 dev_err(dp->dev, "no PHY found\n");
472 return -ENXIO;
473
474 case -EPROBE_DEFER:
475 return -EPROBE_DEFER;
476
477 default:
478 dev_err(dp->dev, "failed to get PHY lane %u\n",
479 i);
480 return PTR_ERR(phy);
481 }
482 }
483
484 dp->phy[i] = phy;
485 dp->num_lanes++;
486 }
487
488 return 0;
489 }
490
491 /**
492 * zynqmp_dp_phy_ready - Check if PHY is ready
493 * @dp: DisplayPort IP core structure
494 *
495 * Check if PHY is ready. If PHY is not ready, wait 1ms to check for 100 times.
496 * This amount of delay was suggested by IP designer.
497 *
498 * Return: 0 if PHY is ready, or -ENODEV if PHY is not ready.
499 */
zynqmp_dp_phy_ready(struct zynqmp_dp * dp)500 static int zynqmp_dp_phy_ready(struct zynqmp_dp *dp)
501 {
502 u32 i, reg, ready;
503
504 ready = (1 << dp->num_lanes) - 1;
505
506 /* Wait for 100 * 1ms. This should be enough time for PHY to be ready */
507 for (i = 0; ; i++) {
508 reg = zynqmp_dp_read(dp, ZYNQMP_DP_PHY_STATUS);
509 if ((reg & ready) == ready)
510 return 0;
511
512 if (i == 100) {
513 dev_err(dp->dev, "PHY isn't ready\n");
514 return -ENODEV;
515 }
516
517 usleep_range(1000, 1100);
518 }
519
520 return 0;
521 }
522
523 /* -----------------------------------------------------------------------------
524 * DisplayPort Link Training
525 */
526
527 /**
528 * zynqmp_dp_max_rate - Calculate and return available max pixel clock
529 * @link_rate: link rate (Kilo-bytes / sec)
530 * @lane_num: number of lanes
531 * @bpp: bits per pixel
532 *
533 * Return: max pixel clock (KHz) supported by current link config.
534 */
zynqmp_dp_max_rate(int link_rate,u8 lane_num,u8 bpp)535 static inline int zynqmp_dp_max_rate(int link_rate, u8 lane_num, u8 bpp)
536 {
537 return link_rate * lane_num * 8 / bpp;
538 }
539
540 /**
541 * zynqmp_dp_mode_configure - Configure the link values
542 * @dp: DisplayPort IP core structure
543 * @pclock: pixel clock for requested display mode
544 * @current_bw: current link rate
545 *
546 * Find the link configuration values, rate and lane count for requested pixel
547 * clock @pclock. The @pclock is stored in the mode to be used in other
548 * functions later. The returned rate is downshifted from the current rate
549 * @current_bw.
550 *
551 * Return: Current link rate code, or -EINVAL.
552 */
zynqmp_dp_mode_configure(struct zynqmp_dp * dp,int pclock,u8 current_bw)553 static int zynqmp_dp_mode_configure(struct zynqmp_dp *dp, int pclock,
554 u8 current_bw)
555 {
556 int max_rate = dp->link_config.max_rate;
557 u8 bw_code;
558 u8 max_lanes = dp->link_config.max_lanes;
559 u8 max_link_rate_code = drm_dp_link_rate_to_bw_code(max_rate);
560 u8 bpp = dp->config.bpp;
561 u8 lane_cnt;
562
563 /* Downshift from current bandwidth */
564 switch (current_bw) {
565 case DP_LINK_BW_5_4:
566 bw_code = DP_LINK_BW_2_7;
567 break;
568 case DP_LINK_BW_2_7:
569 bw_code = DP_LINK_BW_1_62;
570 break;
571 case DP_LINK_BW_1_62:
572 dev_err(dp->dev, "can't downshift. already lowest link rate\n");
573 return -EINVAL;
574 default:
575 /* If not given, start with max supported */
576 bw_code = max_link_rate_code;
577 break;
578 }
579
580 for (lane_cnt = 1; lane_cnt <= max_lanes; lane_cnt <<= 1) {
581 int bw;
582 u32 rate;
583
584 bw = drm_dp_bw_code_to_link_rate(bw_code);
585 rate = zynqmp_dp_max_rate(bw, lane_cnt, bpp);
586 if (pclock <= rate) {
587 dp->mode.bw_code = bw_code;
588 dp->mode.lane_cnt = lane_cnt;
589 dp->mode.pclock = pclock;
590 return dp->mode.bw_code;
591 }
592 }
593
594 dev_err(dp->dev, "failed to configure link values\n");
595
596 return -EINVAL;
597 }
598
599 /**
600 * zynqmp_dp_adjust_train - Adjust train values
601 * @dp: DisplayPort IP core structure
602 * @link_status: link status from sink which contains requested training values
603 */
zynqmp_dp_adjust_train(struct zynqmp_dp * dp,u8 link_status[DP_LINK_STATUS_SIZE])604 static void zynqmp_dp_adjust_train(struct zynqmp_dp *dp,
605 u8 link_status[DP_LINK_STATUS_SIZE])
606 {
607 u8 *train_set = dp->train_set;
608 u8 voltage = 0, preemphasis = 0;
609 u8 i;
610
611 for (i = 0; i < dp->mode.lane_cnt; i++) {
612 u8 v = drm_dp_get_adjust_request_voltage(link_status, i);
613 u8 p = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
614
615 if (v > voltage)
616 voltage = v;
617
618 if (p > preemphasis)
619 preemphasis = p;
620 }
621
622 if (voltage >= DP_TRAIN_VOLTAGE_SWING_LEVEL_3)
623 voltage |= DP_TRAIN_MAX_SWING_REACHED;
624
625 if (preemphasis >= DP_TRAIN_PRE_EMPH_LEVEL_2)
626 preemphasis |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
627
628 for (i = 0; i < dp->mode.lane_cnt; i++)
629 train_set[i] = voltage | preemphasis;
630 }
631
632 /**
633 * zynqmp_dp_update_vs_emph - Update the training values
634 * @dp: DisplayPort IP core structure
635 *
636 * Update the training values based on the request from sink. The mapped values
637 * are predefined, and values(vs, pe, pc) are from the device manual.
638 *
639 * Return: 0 if vs and emph are updated successfully, or the error code returned
640 * by drm_dp_dpcd_write().
641 */
zynqmp_dp_update_vs_emph(struct zynqmp_dp * dp)642 static int zynqmp_dp_update_vs_emph(struct zynqmp_dp *dp)
643 {
644 unsigned int i;
645 int ret;
646
647 ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, dp->train_set,
648 dp->mode.lane_cnt);
649 if (ret < 0)
650 return ret;
651
652 for (i = 0; i < dp->mode.lane_cnt; i++) {
653 u32 reg = ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 + i * 4;
654 union phy_configure_opts opts = { 0 };
655 u8 train = dp->train_set[i];
656
657 opts.dp.voltage[0] = (train & DP_TRAIN_VOLTAGE_SWING_MASK)
658 >> DP_TRAIN_VOLTAGE_SWING_SHIFT;
659 opts.dp.pre[0] = (train & DP_TRAIN_PRE_EMPHASIS_MASK)
660 >> DP_TRAIN_PRE_EMPHASIS_SHIFT;
661
662 phy_configure(dp->phy[i], &opts);
663
664 zynqmp_dp_write(dp, reg, 0x2);
665 }
666
667 return 0;
668 }
669
670 /**
671 * zynqmp_dp_link_train_cr - Train clock recovery
672 * @dp: DisplayPort IP core structure
673 *
674 * Return: 0 if clock recovery train is done successfully, or corresponding
675 * error code.
676 */
zynqmp_dp_link_train_cr(struct zynqmp_dp * dp)677 static int zynqmp_dp_link_train_cr(struct zynqmp_dp *dp)
678 {
679 u8 link_status[DP_LINK_STATUS_SIZE];
680 u8 lane_cnt = dp->mode.lane_cnt;
681 u8 vs = 0, tries = 0;
682 u16 max_tries, i;
683 bool cr_done;
684 int ret;
685
686 zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET,
687 DP_TRAINING_PATTERN_1);
688 ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
689 DP_TRAINING_PATTERN_1 |
690 DP_LINK_SCRAMBLING_DISABLE);
691 if (ret < 0)
692 return ret;
693
694 /*
695 * 256 loops should be maximum iterations for 4 lanes and 4 values.
696 * So, This loop should exit before 512 iterations
697 */
698 for (max_tries = 0; max_tries < 512; max_tries++) {
699 ret = zynqmp_dp_update_vs_emph(dp);
700 if (ret)
701 return ret;
702
703 drm_dp_link_train_clock_recovery_delay(&dp->aux, dp->dpcd);
704 ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
705 if (ret < 0)
706 return ret;
707
708 cr_done = drm_dp_clock_recovery_ok(link_status, lane_cnt);
709 if (cr_done)
710 break;
711
712 for (i = 0; i < lane_cnt; i++)
713 if (!(dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED))
714 break;
715 if (i == lane_cnt)
716 break;
717
718 if ((dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == vs)
719 tries++;
720 else
721 tries = 0;
722
723 if (tries == DP_MAX_TRAINING_TRIES)
724 break;
725
726 vs = dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
727 zynqmp_dp_adjust_train(dp, link_status);
728 }
729
730 if (!cr_done)
731 return -EIO;
732
733 return 0;
734 }
735
736 /**
737 * zynqmp_dp_link_train_ce - Train channel equalization
738 * @dp: DisplayPort IP core structure
739 *
740 * Return: 0 if channel equalization train is done successfully, or
741 * corresponding error code.
742 */
zynqmp_dp_link_train_ce(struct zynqmp_dp * dp)743 static int zynqmp_dp_link_train_ce(struct zynqmp_dp *dp)
744 {
745 u8 link_status[DP_LINK_STATUS_SIZE];
746 u8 lane_cnt = dp->mode.lane_cnt;
747 u32 pat, tries;
748 int ret;
749 bool ce_done;
750
751 if (dp->dpcd[DP_DPCD_REV] >= DP_V1_2 &&
752 dp->dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED)
753 pat = DP_TRAINING_PATTERN_3;
754 else
755 pat = DP_TRAINING_PATTERN_2;
756
757 zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, pat);
758 ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
759 pat | DP_LINK_SCRAMBLING_DISABLE);
760 if (ret < 0)
761 return ret;
762
763 for (tries = 0; tries < DP_MAX_TRAINING_TRIES; tries++) {
764 ret = zynqmp_dp_update_vs_emph(dp);
765 if (ret)
766 return ret;
767
768 drm_dp_link_train_channel_eq_delay(&dp->aux, dp->dpcd);
769 ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
770 if (ret < 0)
771 return ret;
772
773 ce_done = drm_dp_channel_eq_ok(link_status, lane_cnt);
774 if (ce_done)
775 break;
776
777 zynqmp_dp_adjust_train(dp, link_status);
778 }
779
780 if (!ce_done)
781 return -EIO;
782
783 return 0;
784 }
785
786 /**
787 * zynqmp_dp_train - Train the link
788 * @dp: DisplayPort IP core structure
789 *
790 * Return: 0 if all trains are done successfully, or corresponding error code.
791 */
zynqmp_dp_train(struct zynqmp_dp * dp)792 static int zynqmp_dp_train(struct zynqmp_dp *dp)
793 {
794 u32 reg;
795 u8 bw_code = dp->mode.bw_code;
796 u8 lane_cnt = dp->mode.lane_cnt;
797 u8 aux_lane_cnt = lane_cnt;
798 bool enhanced;
799 int ret;
800
801 zynqmp_dp_write(dp, ZYNQMP_DP_LANE_COUNT_SET, lane_cnt);
802 enhanced = drm_dp_enhanced_frame_cap(dp->dpcd);
803 if (enhanced) {
804 zynqmp_dp_write(dp, ZYNQMP_DP_ENHANCED_FRAME_EN, 1);
805 aux_lane_cnt |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
806 }
807
808 if (dp->dpcd[3] & 0x1) {
809 zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 1);
810 drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL,
811 DP_SPREAD_AMP_0_5);
812 } else {
813 zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 0);
814 drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, 0);
815 }
816
817 ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, aux_lane_cnt);
818 if (ret < 0) {
819 dev_err(dp->dev, "failed to set lane count\n");
820 return ret;
821 }
822
823 ret = drm_dp_dpcd_writeb(&dp->aux, DP_MAIN_LINK_CHANNEL_CODING_SET,
824 DP_SET_ANSI_8B10B);
825 if (ret < 0) {
826 dev_err(dp->dev, "failed to set ANSI 8B/10B encoding\n");
827 return ret;
828 }
829
830 ret = drm_dp_dpcd_writeb(&dp->aux, DP_LINK_BW_SET, bw_code);
831 if (ret < 0) {
832 dev_err(dp->dev, "failed to set DP bandwidth\n");
833 return ret;
834 }
835
836 zynqmp_dp_write(dp, ZYNQMP_DP_LINK_BW_SET, bw_code);
837 switch (bw_code) {
838 case DP_LINK_BW_1_62:
839 reg = ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G;
840 break;
841 case DP_LINK_BW_2_7:
842 reg = ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G;
843 break;
844 case DP_LINK_BW_5_4:
845 default:
846 reg = ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G;
847 break;
848 }
849
850 zynqmp_dp_write(dp, ZYNQMP_DP_PHY_CLOCK_SELECT, reg);
851 ret = zynqmp_dp_phy_ready(dp);
852 if (ret < 0)
853 return ret;
854
855 zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 1);
856 memset(dp->train_set, 0, sizeof(dp->train_set));
857 ret = zynqmp_dp_link_train_cr(dp);
858 if (ret)
859 return ret;
860
861 ret = zynqmp_dp_link_train_ce(dp);
862 if (ret)
863 return ret;
864
865 ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
866 DP_TRAINING_PATTERN_DISABLE);
867 if (ret < 0) {
868 dev_err(dp->dev, "failed to disable training pattern\n");
869 return ret;
870 }
871 zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET,
872 DP_TRAINING_PATTERN_DISABLE);
873
874 zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 0);
875
876 return 0;
877 }
878
879 /**
880 * zynqmp_dp_train_loop - Downshift the link rate during training
881 * @dp: DisplayPort IP core structure
882 *
883 * Train the link by downshifting the link rate if training is not successful.
884 */
zynqmp_dp_train_loop(struct zynqmp_dp * dp)885 static void zynqmp_dp_train_loop(struct zynqmp_dp *dp)
886 {
887 struct zynqmp_dp_mode *mode = &dp->mode;
888 u8 bw = mode->bw_code;
889 int ret;
890
891 do {
892 if (dp->status == connector_status_disconnected ||
893 !dp->enabled)
894 return;
895
896 ret = zynqmp_dp_train(dp);
897 if (!ret)
898 return;
899
900 ret = zynqmp_dp_mode_configure(dp, mode->pclock, bw);
901 if (ret < 0)
902 goto err_out;
903
904 bw = ret;
905 } while (bw >= DP_LINK_BW_1_62);
906
907 err_out:
908 dev_err(dp->dev, "failed to train the DP link\n");
909 }
910
911 /* -----------------------------------------------------------------------------
912 * DisplayPort AUX
913 */
914
915 #define AUX_READ_BIT 0x1
916
917 /**
918 * zynqmp_dp_aux_cmd_submit - Submit aux command
919 * @dp: DisplayPort IP core structure
920 * @cmd: aux command
921 * @addr: aux address
922 * @buf: buffer for command data
923 * @bytes: number of bytes for @buf
924 * @reply: reply code to be returned
925 *
926 * Submit an aux command. All aux related commands, native or i2c aux
927 * read/write, are submitted through this function. The function is mapped to
928 * the transfer function of struct drm_dp_aux. This function involves in
929 * multiple register reads/writes, thus synchronization is needed, and it is
930 * done by drm_dp_helper using @hw_mutex. The calling thread goes into sleep
931 * if there's no immediate reply to the command submission. The reply code is
932 * returned at @reply if @reply != NULL.
933 *
934 * Return: 0 if the command is submitted properly, or corresponding error code:
935 * -EBUSY when there is any request already being processed
936 * -ETIMEDOUT when receiving reply is timed out
937 * -EIO when received bytes are less than requested
938 */
zynqmp_dp_aux_cmd_submit(struct zynqmp_dp * dp,u32 cmd,u16 addr,u8 * buf,u8 bytes,u8 * reply)939 static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp *dp, u32 cmd, u16 addr,
940 u8 *buf, u8 bytes, u8 *reply)
941 {
942 bool is_read = (cmd & AUX_READ_BIT) ? true : false;
943 u32 reg, i;
944
945 reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
946 if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST)
947 return -EBUSY;
948
949 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_ADDRESS, addr);
950 if (!is_read)
951 for (i = 0; i < bytes; i++)
952 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_WRITE_FIFO,
953 buf[i]);
954
955 reg = cmd << ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT;
956 if (!buf || !bytes)
957 reg |= ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY;
958 else
959 reg |= (bytes - 1) << ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT;
960 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_COMMAND, reg);
961
962 /* Wait for reply to be delivered upto 2ms */
963 for (i = 0; ; i++) {
964 reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
965 if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY)
966 break;
967
968 if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT ||
969 i == 2)
970 return -ETIMEDOUT;
971
972 usleep_range(1000, 1100);
973 }
974
975 reg = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_CODE);
976 if (reply)
977 *reply = reg;
978
979 if (is_read &&
980 (reg == ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK ||
981 reg == ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK)) {
982 reg = zynqmp_dp_read(dp, ZYNQMP_DP_REPLY_DATA_COUNT);
983 if ((reg & ZYNQMP_DP_REPLY_DATA_COUNT_MASK) != bytes)
984 return -EIO;
985
986 for (i = 0; i < bytes; i++)
987 buf[i] = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_DATA);
988 }
989
990 return 0;
991 }
992
993 static ssize_t
zynqmp_dp_aux_transfer(struct drm_dp_aux * aux,struct drm_dp_aux_msg * msg)994 zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
995 {
996 struct zynqmp_dp *dp = container_of(aux, struct zynqmp_dp, aux);
997 int ret;
998 unsigned int i, iter;
999
1000 /* Number of loops = timeout in msec / aux delay (400 usec) */
1001 iter = zynqmp_dp_aux_timeout_ms * 1000 / 400;
1002 iter = iter ? iter : 1;
1003
1004 for (i = 0; i < iter; i++) {
1005 ret = zynqmp_dp_aux_cmd_submit(dp, msg->request, msg->address,
1006 msg->buffer, msg->size,
1007 &msg->reply);
1008 if (!ret) {
1009 dev_dbg(dp->dev, "aux %d retries\n", i);
1010 return msg->size;
1011 }
1012
1013 if (dp->status == connector_status_disconnected) {
1014 dev_dbg(dp->dev, "no connected aux device\n");
1015 return -ENODEV;
1016 }
1017
1018 usleep_range(400, 500);
1019 }
1020
1021 dev_dbg(dp->dev, "failed to do aux transfer (%d)\n", ret);
1022
1023 return ret;
1024 }
1025
1026 /**
1027 * zynqmp_dp_aux_init - Initialize and register the DP AUX
1028 * @dp: DisplayPort IP core structure
1029 *
1030 * Program the AUX clock divider and filter and register the DP AUX adapter.
1031 *
1032 * Return: 0 on success, error value otherwise
1033 */
zynqmp_dp_aux_init(struct zynqmp_dp * dp)1034 static int zynqmp_dp_aux_init(struct zynqmp_dp *dp)
1035 {
1036 unsigned long rate;
1037 unsigned int w;
1038
1039 /*
1040 * The AUX_SIGNAL_WIDTH_FILTER is the number of APB clock cycles
1041 * corresponding to the AUX pulse. Allowable values are 8, 16, 24, 32,
1042 * 40 and 48. The AUX pulse width must be between 0.4µs and 0.6µs,
1043 * compute the w / 8 value corresponding to 0.4µs rounded up, and make
1044 * sure it stays below 0.6µs and within the allowable values.
1045 */
1046 rate = clk_get_rate(dp->dpsub->apb_clk);
1047 w = DIV_ROUND_UP(4 * rate, 1000 * 1000 * 10 * 8) * 8;
1048 if (w > 6 * rate / (1000 * 1000 * 10) || w > 48) {
1049 dev_err(dp->dev, "aclk frequency too high\n");
1050 return -EINVAL;
1051 }
1052
1053 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_CLK_DIVIDER,
1054 (w << ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT) |
1055 (rate / (1000 * 1000)));
1056
1057 dp->aux.name = "ZynqMP DP AUX";
1058 dp->aux.dev = dp->dev;
1059 dp->aux.drm_dev = dp->bridge.dev;
1060 dp->aux.transfer = zynqmp_dp_aux_transfer;
1061
1062 return drm_dp_aux_register(&dp->aux);
1063 }
1064
1065 /**
1066 * zynqmp_dp_aux_cleanup - Cleanup the DP AUX
1067 * @dp: DisplayPort IP core structure
1068 *
1069 * Unregister the DP AUX adapter.
1070 */
zynqmp_dp_aux_cleanup(struct zynqmp_dp * dp)1071 static void zynqmp_dp_aux_cleanup(struct zynqmp_dp *dp)
1072 {
1073 drm_dp_aux_unregister(&dp->aux);
1074 }
1075
1076 /* -----------------------------------------------------------------------------
1077 * DisplayPort Generic Support
1078 */
1079
1080 /**
1081 * zynqmp_dp_update_misc - Write the misc registers
1082 * @dp: DisplayPort IP core structure
1083 *
1084 * The misc register values are stored in the structure, and this
1085 * function applies the values into the registers.
1086 */
zynqmp_dp_update_misc(struct zynqmp_dp * dp)1087 static void zynqmp_dp_update_misc(struct zynqmp_dp *dp)
1088 {
1089 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC0, dp->config.misc0);
1090 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC1, dp->config.misc1);
1091 }
1092
1093 /**
1094 * zynqmp_dp_set_format - Set the input format
1095 * @dp: DisplayPort IP core structure
1096 * @info: Display info
1097 * @format: input format
1098 * @bpc: bits per component
1099 *
1100 * Update misc register values based on input @format and @bpc.
1101 *
1102 * Return: 0 on success, or -EINVAL.
1103 */
zynqmp_dp_set_format(struct zynqmp_dp * dp,const struct drm_display_info * info,enum zynqmp_dpsub_format format,unsigned int bpc)1104 static int zynqmp_dp_set_format(struct zynqmp_dp *dp,
1105 const struct drm_display_info *info,
1106 enum zynqmp_dpsub_format format,
1107 unsigned int bpc)
1108 {
1109 struct zynqmp_dp_config *config = &dp->config;
1110 unsigned int num_colors;
1111
1112 config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK;
1113 config->misc1 &= ~ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN;
1114
1115 switch (format) {
1116 case ZYNQMP_DPSUB_FORMAT_RGB:
1117 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB;
1118 num_colors = 3;
1119 break;
1120
1121 case ZYNQMP_DPSUB_FORMAT_YCRCB444:
1122 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444;
1123 num_colors = 3;
1124 break;
1125
1126 case ZYNQMP_DPSUB_FORMAT_YCRCB422:
1127 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422;
1128 num_colors = 2;
1129 break;
1130
1131 case ZYNQMP_DPSUB_FORMAT_YONLY:
1132 config->misc1 |= ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN;
1133 num_colors = 1;
1134 break;
1135
1136 default:
1137 dev_err(dp->dev, "Invalid colormetry in DT\n");
1138 return -EINVAL;
1139 }
1140
1141 if (info && info->bpc && bpc > info->bpc) {
1142 dev_warn(dp->dev,
1143 "downgrading requested %ubpc to display limit %ubpc\n",
1144 bpc, info->bpc);
1145 bpc = info->bpc;
1146 }
1147
1148 config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK;
1149
1150 switch (bpc) {
1151 case 6:
1152 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6;
1153 break;
1154 case 8:
1155 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8;
1156 break;
1157 case 10:
1158 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10;
1159 break;
1160 case 12:
1161 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12;
1162 break;
1163 case 16:
1164 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16;
1165 break;
1166 default:
1167 dev_warn(dp->dev, "Not supported bpc (%u). fall back to 8bpc\n",
1168 bpc);
1169 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8;
1170 bpc = 8;
1171 break;
1172 }
1173
1174 /* Update the current bpp based on the format. */
1175 config->bpp = bpc * num_colors;
1176
1177 return 0;
1178 }
1179
1180 /**
1181 * zynqmp_dp_encoder_mode_set_transfer_unit - Set the transfer unit values
1182 * @dp: DisplayPort IP core structure
1183 * @mode: requested display mode
1184 *
1185 * Set the transfer unit, and calculate all transfer unit size related values.
1186 * Calculation is based on DP and IP core specification.
1187 */
1188 static void
zynqmp_dp_encoder_mode_set_transfer_unit(struct zynqmp_dp * dp,const struct drm_display_mode * mode)1189 zynqmp_dp_encoder_mode_set_transfer_unit(struct zynqmp_dp *dp,
1190 const struct drm_display_mode *mode)
1191 {
1192 u32 tu = ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF;
1193 u32 bw, vid_kbytes, avg_bytes_per_tu, init_wait;
1194
1195 /* Use the max transfer unit size (default) */
1196 zynqmp_dp_write(dp, ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE, tu);
1197
1198 vid_kbytes = mode->clock * (dp->config.bpp / 8);
1199 bw = drm_dp_bw_code_to_link_rate(dp->mode.bw_code);
1200 avg_bytes_per_tu = vid_kbytes * tu / (dp->mode.lane_cnt * bw / 1000);
1201 zynqmp_dp_write(dp, ZYNQMP_DP_MIN_BYTES_PER_TU,
1202 avg_bytes_per_tu / 1000);
1203 zynqmp_dp_write(dp, ZYNQMP_DP_FRAC_BYTES_PER_TU,
1204 avg_bytes_per_tu % 1000);
1205
1206 /* Configure the initial wait cycle based on transfer unit size */
1207 if (tu < (avg_bytes_per_tu / 1000))
1208 init_wait = 0;
1209 else if ((avg_bytes_per_tu / 1000) <= 4)
1210 init_wait = tu;
1211 else
1212 init_wait = tu - avg_bytes_per_tu / 1000;
1213
1214 zynqmp_dp_write(dp, ZYNQMP_DP_INIT_WAIT, init_wait);
1215 }
1216
1217 /**
1218 * zynqmp_dp_encoder_mode_set_stream - Configure the main stream
1219 * @dp: DisplayPort IP core structure
1220 * @mode: requested display mode
1221 *
1222 * Configure the main stream based on the requested mode @mode. Calculation is
1223 * based on IP core specification.
1224 */
zynqmp_dp_encoder_mode_set_stream(struct zynqmp_dp * dp,const struct drm_display_mode * mode)1225 static void zynqmp_dp_encoder_mode_set_stream(struct zynqmp_dp *dp,
1226 const struct drm_display_mode *mode)
1227 {
1228 u8 lane_cnt = dp->mode.lane_cnt;
1229 u32 reg, wpl;
1230 unsigned int rate;
1231
1232 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HTOTAL, mode->htotal);
1233 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VTOTAL, mode->vtotal);
1234 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_POLARITY,
1235 (!!(mode->flags & DRM_MODE_FLAG_PVSYNC) <<
1236 ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT) |
1237 (!!(mode->flags & DRM_MODE_FLAG_PHSYNC) <<
1238 ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT));
1239 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSWIDTH,
1240 mode->hsync_end - mode->hsync_start);
1241 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSWIDTH,
1242 mode->vsync_end - mode->vsync_start);
1243 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HRES, mode->hdisplay);
1244 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VRES, mode->vdisplay);
1245 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSTART,
1246 mode->htotal - mode->hsync_start);
1247 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSTART,
1248 mode->vtotal - mode->vsync_start);
1249
1250 /* In synchronous mode, set the dividers */
1251 if (dp->config.misc0 & ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK) {
1252 reg = drm_dp_bw_code_to_link_rate(dp->mode.bw_code);
1253 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_N_VID, reg);
1254 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_M_VID, mode->clock);
1255 rate = zynqmp_dpsub_get_audio_clk_rate(dp->dpsub);
1256 if (rate) {
1257 dev_dbg(dp->dev, "Audio rate: %d\n", rate / 512);
1258 zynqmp_dp_write(dp, ZYNQMP_DP_TX_N_AUD, reg);
1259 zynqmp_dp_write(dp, ZYNQMP_DP_TX_M_AUD, rate / 1000);
1260 }
1261 }
1262
1263 /* Only 2 channel audio is supported now */
1264 if (zynqmp_dpsub_audio_enabled(dp->dpsub))
1265 zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CHANNELS, 1);
1266
1267 zynqmp_dp_write(dp, ZYNQMP_DP_USER_PIX_WIDTH, 1);
1268
1269 /* Translate to the native 16 bit datapath based on IP core spec */
1270 wpl = (mode->hdisplay * dp->config.bpp + 15) / 16;
1271 reg = wpl + wpl % lane_cnt - lane_cnt;
1272 zynqmp_dp_write(dp, ZYNQMP_DP_USER_DATA_COUNT_PER_LANE, reg);
1273 }
1274
1275 /* -----------------------------------------------------------------------------
1276 * DISP Configuration
1277 */
1278
zynqmp_dp_disp_enable(struct zynqmp_dp * dp,struct drm_bridge_state * old_bridge_state)1279 static void zynqmp_dp_disp_enable(struct zynqmp_dp *dp,
1280 struct drm_bridge_state *old_bridge_state)
1281 {
1282 enum zynqmp_dpsub_layer_id layer_id;
1283 struct zynqmp_disp_layer *layer;
1284 const struct drm_format_info *info;
1285
1286 if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO))
1287 layer_id = ZYNQMP_DPSUB_LAYER_VID;
1288 else if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))
1289 layer_id = ZYNQMP_DPSUB_LAYER_GFX;
1290 else
1291 return;
1292
1293 layer = dp->dpsub->layers[layer_id];
1294
1295 /* TODO: Make the format configurable. */
1296 info = drm_format_info(DRM_FORMAT_YUV422);
1297 zynqmp_disp_layer_set_format(layer, info);
1298 zynqmp_disp_layer_enable(layer, ZYNQMP_DPSUB_LAYER_LIVE);
1299
1300 if (layer_id == ZYNQMP_DPSUB_LAYER_GFX)
1301 zynqmp_disp_blend_set_global_alpha(dp->dpsub->disp, true, 255);
1302 else
1303 zynqmp_disp_blend_set_global_alpha(dp->dpsub->disp, false, 0);
1304
1305 zynqmp_disp_enable(dp->dpsub->disp);
1306 }
1307
zynqmp_dp_disp_disable(struct zynqmp_dp * dp,struct drm_bridge_state * old_bridge_state)1308 static void zynqmp_dp_disp_disable(struct zynqmp_dp *dp,
1309 struct drm_bridge_state *old_bridge_state)
1310 {
1311 struct zynqmp_disp_layer *layer;
1312
1313 if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO))
1314 layer = dp->dpsub->layers[ZYNQMP_DPSUB_LAYER_VID];
1315 else if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))
1316 layer = dp->dpsub->layers[ZYNQMP_DPSUB_LAYER_GFX];
1317 else
1318 return;
1319
1320 zynqmp_disp_disable(dp->dpsub->disp);
1321 zynqmp_disp_layer_disable(layer);
1322 }
1323
1324 /* -----------------------------------------------------------------------------
1325 * DRM Bridge
1326 */
1327
zynqmp_dp_bridge_attach(struct drm_bridge * bridge,enum drm_bridge_attach_flags flags)1328 static int zynqmp_dp_bridge_attach(struct drm_bridge *bridge,
1329 enum drm_bridge_attach_flags flags)
1330 {
1331 struct zynqmp_dp *dp = bridge_to_dp(bridge);
1332 int ret;
1333
1334 /* Initialize and register the AUX adapter. */
1335 ret = zynqmp_dp_aux_init(dp);
1336 if (ret) {
1337 dev_err(dp->dev, "failed to initialize DP aux\n");
1338 return ret;
1339 }
1340
1341 if (dp->next_bridge) {
1342 ret = drm_bridge_attach(bridge->encoder, dp->next_bridge,
1343 bridge, flags);
1344 if (ret < 0)
1345 goto error;
1346 }
1347
1348 /* Now that initialisation is complete, enable interrupts. */
1349 zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_ALL);
1350
1351 return 0;
1352
1353 error:
1354 zynqmp_dp_aux_cleanup(dp);
1355 return ret;
1356 }
1357
zynqmp_dp_bridge_detach(struct drm_bridge * bridge)1358 static void zynqmp_dp_bridge_detach(struct drm_bridge *bridge)
1359 {
1360 struct zynqmp_dp *dp = bridge_to_dp(bridge);
1361
1362 zynqmp_dp_aux_cleanup(dp);
1363 }
1364
1365 static enum drm_mode_status
zynqmp_dp_bridge_mode_valid(struct drm_bridge * bridge,const struct drm_display_info * info,const struct drm_display_mode * mode)1366 zynqmp_dp_bridge_mode_valid(struct drm_bridge *bridge,
1367 const struct drm_display_info *info,
1368 const struct drm_display_mode *mode)
1369 {
1370 struct zynqmp_dp *dp = bridge_to_dp(bridge);
1371 int rate;
1372
1373 if (mode->clock > ZYNQMP_MAX_FREQ) {
1374 dev_dbg(dp->dev, "filtered mode %s for high pixel rate\n",
1375 mode->name);
1376 drm_mode_debug_printmodeline(mode);
1377 return MODE_CLOCK_HIGH;
1378 }
1379
1380 /* Check with link rate and lane count */
1381 rate = zynqmp_dp_max_rate(dp->link_config.max_rate,
1382 dp->link_config.max_lanes, dp->config.bpp);
1383 if (mode->clock > rate) {
1384 dev_dbg(dp->dev, "filtered mode %s for high pixel rate\n",
1385 mode->name);
1386 drm_mode_debug_printmodeline(mode);
1387 return MODE_CLOCK_HIGH;
1388 }
1389
1390 return MODE_OK;
1391 }
1392
zynqmp_dp_bridge_atomic_enable(struct drm_bridge * bridge,struct drm_bridge_state * old_bridge_state)1393 static void zynqmp_dp_bridge_atomic_enable(struct drm_bridge *bridge,
1394 struct drm_bridge_state *old_bridge_state)
1395 {
1396 struct zynqmp_dp *dp = bridge_to_dp(bridge);
1397 struct drm_atomic_state *state = old_bridge_state->base.state;
1398 const struct drm_crtc_state *crtc_state;
1399 const struct drm_display_mode *adjusted_mode;
1400 const struct drm_display_mode *mode;
1401 struct drm_connector *connector;
1402 struct drm_crtc *crtc;
1403 unsigned int i;
1404 int rate;
1405 int ret;
1406
1407 pm_runtime_get_sync(dp->dev);
1408
1409 zynqmp_dp_disp_enable(dp, old_bridge_state);
1410
1411 /*
1412 * Retrieve the CRTC mode and adjusted mode. This requires a little
1413 * dance to go from the bridge to the encoder, to the connector and to
1414 * the CRTC.
1415 */
1416 connector = drm_atomic_get_new_connector_for_encoder(state,
1417 bridge->encoder);
1418 crtc = drm_atomic_get_new_connector_state(state, connector)->crtc;
1419 crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
1420 adjusted_mode = &crtc_state->adjusted_mode;
1421 mode = &crtc_state->mode;
1422
1423 zynqmp_dp_set_format(dp, &connector->display_info,
1424 ZYNQMP_DPSUB_FORMAT_RGB, 8);
1425
1426 /* Check again as bpp or format might have been changed */
1427 rate = zynqmp_dp_max_rate(dp->link_config.max_rate,
1428 dp->link_config.max_lanes, dp->config.bpp);
1429 if (mode->clock > rate) {
1430 dev_err(dp->dev, "mode %s has too high pixel rate\n",
1431 mode->name);
1432 drm_mode_debug_printmodeline(mode);
1433 }
1434
1435 /* Configure the mode */
1436 ret = zynqmp_dp_mode_configure(dp, adjusted_mode->clock, 0);
1437 if (ret < 0) {
1438 pm_runtime_put_sync(dp->dev);
1439 return;
1440 }
1441
1442 zynqmp_dp_encoder_mode_set_transfer_unit(dp, adjusted_mode);
1443 zynqmp_dp_encoder_mode_set_stream(dp, adjusted_mode);
1444
1445 /* Enable the encoder */
1446 dp->enabled = true;
1447 zynqmp_dp_update_misc(dp);
1448 if (zynqmp_dpsub_audio_enabled(dp->dpsub))
1449 zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 1);
1450 zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, 0);
1451 if (dp->status == connector_status_connected) {
1452 for (i = 0; i < 3; i++) {
1453 ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER,
1454 DP_SET_POWER_D0);
1455 if (ret == 1)
1456 break;
1457 usleep_range(300, 500);
1458 }
1459 /* Some monitors take time to wake up properly */
1460 msleep(zynqmp_dp_power_on_delay_ms);
1461 }
1462 if (ret != 1)
1463 dev_dbg(dp->dev, "DP aux failed\n");
1464 else
1465 zynqmp_dp_train_loop(dp);
1466 zynqmp_dp_write(dp, ZYNQMP_DP_SOFTWARE_RESET,
1467 ZYNQMP_DP_SOFTWARE_RESET_ALL);
1468 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 1);
1469 }
1470
zynqmp_dp_bridge_atomic_disable(struct drm_bridge * bridge,struct drm_bridge_state * old_bridge_state)1471 static void zynqmp_dp_bridge_atomic_disable(struct drm_bridge *bridge,
1472 struct drm_bridge_state *old_bridge_state)
1473 {
1474 struct zynqmp_dp *dp = bridge_to_dp(bridge);
1475
1476 dp->enabled = false;
1477 cancel_delayed_work(&dp->hpd_work);
1478 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 0);
1479 drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
1480 zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN,
1481 ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL);
1482 if (zynqmp_dpsub_audio_enabled(dp->dpsub))
1483 zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 0);
1484
1485 zynqmp_dp_disp_disable(dp, old_bridge_state);
1486
1487 pm_runtime_put_sync(dp->dev);
1488 }
1489
1490 #define ZYNQMP_DP_MIN_H_BACKPORCH 20
1491
zynqmp_dp_bridge_atomic_check(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)1492 static int zynqmp_dp_bridge_atomic_check(struct drm_bridge *bridge,
1493 struct drm_bridge_state *bridge_state,
1494 struct drm_crtc_state *crtc_state,
1495 struct drm_connector_state *conn_state)
1496 {
1497 struct zynqmp_dp *dp = bridge_to_dp(bridge);
1498 struct drm_display_mode *mode = &crtc_state->mode;
1499 struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
1500 int diff = mode->htotal - mode->hsync_end;
1501
1502 /*
1503 * ZynqMP DP requires horizontal backporch to be greater than 12.
1504 * This limitation may not be compatible with the sink device.
1505 */
1506 if (diff < ZYNQMP_DP_MIN_H_BACKPORCH) {
1507 int vrefresh = (adjusted_mode->clock * 1000) /
1508 (adjusted_mode->vtotal * adjusted_mode->htotal);
1509
1510 dev_dbg(dp->dev, "hbackporch adjusted: %d to %d",
1511 diff, ZYNQMP_DP_MIN_H_BACKPORCH - diff);
1512 diff = ZYNQMP_DP_MIN_H_BACKPORCH - diff;
1513 adjusted_mode->htotal += diff;
1514 adjusted_mode->clock = adjusted_mode->vtotal *
1515 adjusted_mode->htotal * vrefresh / 1000;
1516 }
1517
1518 return 0;
1519 }
1520
zynqmp_dp_bridge_detect(struct drm_bridge * bridge)1521 static enum drm_connector_status zynqmp_dp_bridge_detect(struct drm_bridge *bridge)
1522 {
1523 struct zynqmp_dp *dp = bridge_to_dp(bridge);
1524 struct zynqmp_dp_link_config *link_config = &dp->link_config;
1525 u32 state, i;
1526 int ret;
1527
1528 /*
1529 * This is from heuristic. It takes some delay (ex, 100 ~ 500 msec) to
1530 * get the HPD signal with some monitors.
1531 */
1532 for (i = 0; i < 10; i++) {
1533 state = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
1534 if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD)
1535 break;
1536 msleep(100);
1537 }
1538
1539 if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD) {
1540 ret = drm_dp_dpcd_read(&dp->aux, 0x0, dp->dpcd,
1541 sizeof(dp->dpcd));
1542 if (ret < 0) {
1543 dev_dbg(dp->dev, "DPCD read failed");
1544 goto disconnected;
1545 }
1546
1547 link_config->max_rate = min_t(int,
1548 drm_dp_max_link_rate(dp->dpcd),
1549 DP_HIGH_BIT_RATE2);
1550 link_config->max_lanes = min_t(u8,
1551 drm_dp_max_lane_count(dp->dpcd),
1552 dp->num_lanes);
1553
1554 dp->status = connector_status_connected;
1555 return connector_status_connected;
1556 }
1557
1558 disconnected:
1559 dp->status = connector_status_disconnected;
1560 return connector_status_disconnected;
1561 }
1562
zynqmp_dp_bridge_get_edid(struct drm_bridge * bridge,struct drm_connector * connector)1563 static struct edid *zynqmp_dp_bridge_get_edid(struct drm_bridge *bridge,
1564 struct drm_connector *connector)
1565 {
1566 struct zynqmp_dp *dp = bridge_to_dp(bridge);
1567
1568 return drm_get_edid(connector, &dp->aux.ddc);
1569 }
1570
1571 static const struct drm_bridge_funcs zynqmp_dp_bridge_funcs = {
1572 .attach = zynqmp_dp_bridge_attach,
1573 .detach = zynqmp_dp_bridge_detach,
1574 .mode_valid = zynqmp_dp_bridge_mode_valid,
1575 .atomic_enable = zynqmp_dp_bridge_atomic_enable,
1576 .atomic_disable = zynqmp_dp_bridge_atomic_disable,
1577 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
1578 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
1579 .atomic_reset = drm_atomic_helper_bridge_reset,
1580 .atomic_check = zynqmp_dp_bridge_atomic_check,
1581 .detect = zynqmp_dp_bridge_detect,
1582 .get_edid = zynqmp_dp_bridge_get_edid,
1583 };
1584
1585 /* -----------------------------------------------------------------------------
1586 * Interrupt Handling
1587 */
1588
1589 /**
1590 * zynqmp_dp_enable_vblank - Enable vblank
1591 * @dp: DisplayPort IP core structure
1592 *
1593 * Enable vblank interrupt
1594 */
zynqmp_dp_enable_vblank(struct zynqmp_dp * dp)1595 void zynqmp_dp_enable_vblank(struct zynqmp_dp *dp)
1596 {
1597 zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_VBLANK_START);
1598 }
1599
1600 /**
1601 * zynqmp_dp_disable_vblank - Disable vblank
1602 * @dp: DisplayPort IP core structure
1603 *
1604 * Disable vblank interrupt
1605 */
zynqmp_dp_disable_vblank(struct zynqmp_dp * dp)1606 void zynqmp_dp_disable_vblank(struct zynqmp_dp *dp)
1607 {
1608 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_VBLANK_START);
1609 }
1610
zynqmp_dp_hpd_work_func(struct work_struct * work)1611 static void zynqmp_dp_hpd_work_func(struct work_struct *work)
1612 {
1613 struct zynqmp_dp *dp = container_of(work, struct zynqmp_dp,
1614 hpd_work.work);
1615 enum drm_connector_status status;
1616
1617 status = zynqmp_dp_bridge_detect(&dp->bridge);
1618 drm_bridge_hpd_notify(&dp->bridge, status);
1619 }
1620
zynqmp_dp_irq_handler(int irq,void * data)1621 static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
1622 {
1623 struct zynqmp_dp *dp = (struct zynqmp_dp *)data;
1624 u32 status, mask;
1625
1626 status = zynqmp_dp_read(dp, ZYNQMP_DP_INT_STATUS);
1627 mask = zynqmp_dp_read(dp, ZYNQMP_DP_INT_MASK);
1628 if (!(status & ~mask))
1629 return IRQ_NONE;
1630
1631 /* dbg for diagnostic, but not much that the driver can do */
1632 if (status & ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK)
1633 dev_dbg_ratelimited(dp->dev, "underflow interrupt\n");
1634 if (status & ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK)
1635 dev_dbg_ratelimited(dp->dev, "overflow interrupt\n");
1636
1637 zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status);
1638
1639 if (status & ZYNQMP_DP_INT_VBLANK_START)
1640 zynqmp_dpsub_drm_handle_vblank(dp->dpsub);
1641
1642 if (status & ZYNQMP_DP_INT_HPD_EVENT)
1643 schedule_delayed_work(&dp->hpd_work, 0);
1644
1645 if (status & ZYNQMP_DP_INT_HPD_IRQ) {
1646 int ret;
1647 u8 status[DP_LINK_STATUS_SIZE + 2];
1648
1649 ret = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status,
1650 DP_LINK_STATUS_SIZE + 2);
1651 if (ret < 0)
1652 goto handled;
1653
1654 if (status[4] & DP_LINK_STATUS_UPDATED ||
1655 !drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) ||
1656 !drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) {
1657 zynqmp_dp_train_loop(dp);
1658 }
1659 }
1660
1661 handled:
1662 return IRQ_HANDLED;
1663 }
1664
1665 /* -----------------------------------------------------------------------------
1666 * Initialization & Cleanup
1667 */
1668
zynqmp_dp_probe(struct zynqmp_dpsub * dpsub)1669 int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub)
1670 {
1671 struct platform_device *pdev = to_platform_device(dpsub->dev);
1672 struct drm_bridge *bridge;
1673 struct zynqmp_dp *dp;
1674 struct resource *res;
1675 int ret;
1676
1677 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1678 if (!dp)
1679 return -ENOMEM;
1680
1681 dp->dev = &pdev->dev;
1682 dp->dpsub = dpsub;
1683 dp->status = connector_status_disconnected;
1684
1685 INIT_DELAYED_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func);
1686
1687 /* Acquire all resources (IOMEM, IRQ and PHYs). */
1688 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dp");
1689 dp->iomem = devm_ioremap_resource(dp->dev, res);
1690 if (IS_ERR(dp->iomem)) {
1691 ret = PTR_ERR(dp->iomem);
1692 goto err_free;
1693 }
1694
1695 dp->irq = platform_get_irq(pdev, 0);
1696 if (dp->irq < 0) {
1697 ret = dp->irq;
1698 goto err_free;
1699 }
1700
1701 dp->reset = devm_reset_control_get(dp->dev, NULL);
1702 if (IS_ERR(dp->reset)) {
1703 if (PTR_ERR(dp->reset) != -EPROBE_DEFER)
1704 dev_err(dp->dev, "failed to get reset: %ld\n",
1705 PTR_ERR(dp->reset));
1706 ret = PTR_ERR(dp->reset);
1707 goto err_free;
1708 }
1709
1710 ret = zynqmp_dp_reset(dp, false);
1711 if (ret < 0)
1712 goto err_free;
1713
1714 ret = zynqmp_dp_phy_probe(dp);
1715 if (ret)
1716 goto err_reset;
1717
1718 /* Initialize the bridge. */
1719 bridge = &dp->bridge;
1720 bridge->funcs = &zynqmp_dp_bridge_funcs;
1721 bridge->ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID
1722 | DRM_BRIDGE_OP_HPD;
1723 bridge->type = DRM_MODE_CONNECTOR_DisplayPort;
1724 dpsub->bridge = bridge;
1725
1726 /*
1727 * Acquire the next bridge in the chain. Ignore errors caused by port@5
1728 * not being connected for backward-compatibility with older DTs.
1729 */
1730 ret = drm_of_find_panel_or_bridge(dp->dev->of_node, 5, 0, NULL,
1731 &dp->next_bridge);
1732 if (ret < 0 && ret != -ENODEV)
1733 goto err_reset;
1734
1735 /* Initialize the hardware. */
1736 dp->config.misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK;
1737 zynqmp_dp_set_format(dp, NULL, ZYNQMP_DPSUB_FORMAT_RGB, 8);
1738
1739 zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN,
1740 ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL);
1741 zynqmp_dp_set(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET);
1742 zynqmp_dp_write(dp, ZYNQMP_DP_FORCE_SCRAMBLER_RESET, 1);
1743 zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0);
1744 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff);
1745
1746 ret = zynqmp_dp_phy_init(dp);
1747 if (ret)
1748 goto err_reset;
1749
1750 zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 1);
1751
1752 /*
1753 * Now that the hardware is initialized and won't generate spurious
1754 * interrupts, request the IRQ.
1755 */
1756 ret = devm_request_threaded_irq(dp->dev, dp->irq, NULL,
1757 zynqmp_dp_irq_handler, IRQF_ONESHOT,
1758 dev_name(dp->dev), dp);
1759 if (ret < 0)
1760 goto err_phy_exit;
1761
1762 dpsub->dp = dp;
1763
1764 dev_dbg(dp->dev, "ZynqMP DisplayPort Tx probed with %u lanes\n",
1765 dp->num_lanes);
1766
1767 return 0;
1768
1769 err_phy_exit:
1770 zynqmp_dp_phy_exit(dp);
1771 err_reset:
1772 zynqmp_dp_reset(dp, true);
1773 err_free:
1774 kfree(dp);
1775 return ret;
1776 }
1777
zynqmp_dp_remove(struct zynqmp_dpsub * dpsub)1778 void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub)
1779 {
1780 struct zynqmp_dp *dp = dpsub->dp;
1781
1782 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_ALL);
1783 disable_irq(dp->irq);
1784
1785 cancel_delayed_work_sync(&dp->hpd_work);
1786
1787 zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0);
1788 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff);
1789
1790 zynqmp_dp_phy_exit(dp);
1791 zynqmp_dp_reset(dp, true);
1792 }
1793