Loading...
Note: File does not exist in v5.4.
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ZynqMP DisplayPort Driver
4 *
5 * Copyright (C) 2017 - 2020 Xilinx, Inc.
6 *
7 * Authors:
8 * - Hyun Woo Kwon <hyun.kwon@xilinx.com>
9 * - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
10 */
11
12#include <drm/drm_atomic_helper.h>
13#include <drm/drm_connector.h>
14#include <drm/drm_crtc.h>
15#include <drm/drm_device.h>
16#include <drm/drm_dp_helper.h>
17#include <drm/drm_edid.h>
18#include <drm/drm_encoder.h>
19#include <drm/drm_managed.h>
20#include <drm/drm_modes.h>
21#include <drm/drm_of.h>
22#include <drm/drm_probe_helper.h>
23#include <drm/drm_simple_kms_helper.h>
24
25#include <linux/clk.h>
26#include <linux/delay.h>
27#include <linux/device.h>
28#include <linux/module.h>
29#include <linux/platform_device.h>
30#include <linux/pm_runtime.h>
31#include <linux/phy/phy.h>
32#include <linux/reset.h>
33
34#include "zynqmp_disp.h"
35#include "zynqmp_dp.h"
36#include "zynqmp_dpsub.h"
37
38static uint zynqmp_dp_aux_timeout_ms = 50;
39module_param_named(aux_timeout_ms, zynqmp_dp_aux_timeout_ms, uint, 0444);
40MODULE_PARM_DESC(aux_timeout_ms, "DP aux timeout value in msec (default: 50)");
41
42/*
43 * Some sink requires a delay after power on request
44 */
45static uint zynqmp_dp_power_on_delay_ms = 4;
46module_param_named(power_on_delay_ms, zynqmp_dp_power_on_delay_ms, uint, 0444);
47MODULE_PARM_DESC(power_on_delay_ms, "DP power on delay in msec (default: 4)");
48
49/* Link configuration registers */
50#define ZYNQMP_DP_LINK_BW_SET 0x0
51#define ZYNQMP_DP_LANE_COUNT_SET 0x4
52#define ZYNQMP_DP_ENHANCED_FRAME_EN 0x8
53#define ZYNQMP_DP_TRAINING_PATTERN_SET 0xc
54#define ZYNQMP_DP_SCRAMBLING_DISABLE 0x14
55#define ZYNQMP_DP_DOWNSPREAD_CTL 0x18
56#define ZYNQMP_DP_SOFTWARE_RESET 0x1c
57#define ZYNQMP_DP_SOFTWARE_RESET_STREAM1 BIT(0)
58#define ZYNQMP_DP_SOFTWARE_RESET_STREAM2 BIT(1)
59#define ZYNQMP_DP_SOFTWARE_RESET_STREAM3 BIT(2)
60#define ZYNQMP_DP_SOFTWARE_RESET_STREAM4 BIT(3)
61#define ZYNQMP_DP_SOFTWARE_RESET_AUX BIT(7)
62#define ZYNQMP_DP_SOFTWARE_RESET_ALL (ZYNQMP_DP_SOFTWARE_RESET_STREAM1 | \
63 ZYNQMP_DP_SOFTWARE_RESET_STREAM2 | \
64 ZYNQMP_DP_SOFTWARE_RESET_STREAM3 | \
65 ZYNQMP_DP_SOFTWARE_RESET_STREAM4 | \
66 ZYNQMP_DP_SOFTWARE_RESET_AUX)
67
68/* Core enable registers */
69#define ZYNQMP_DP_TRANSMITTER_ENABLE 0x80
70#define ZYNQMP_DP_MAIN_STREAM_ENABLE 0x84
71#define ZYNQMP_DP_FORCE_SCRAMBLER_RESET 0xc0
72#define ZYNQMP_DP_VERSION 0xf8
73#define ZYNQMP_DP_VERSION_MAJOR_MASK GENMASK(31, 24)
74#define ZYNQMP_DP_VERSION_MAJOR_SHIFT 24
75#define ZYNQMP_DP_VERSION_MINOR_MASK GENMASK(23, 16)
76#define ZYNQMP_DP_VERSION_MINOR_SHIFT 16
77#define ZYNQMP_DP_VERSION_REVISION_MASK GENMASK(15, 12)
78#define ZYNQMP_DP_VERSION_REVISION_SHIFT 12
79#define ZYNQMP_DP_VERSION_PATCH_MASK GENMASK(11, 8)
80#define ZYNQMP_DP_VERSION_PATCH_SHIFT 8
81#define ZYNQMP_DP_VERSION_INTERNAL_MASK GENMASK(7, 0)
82#define ZYNQMP_DP_VERSION_INTERNAL_SHIFT 0
83
84/* Core ID registers */
85#define ZYNQMP_DP_CORE_ID 0xfc
86#define ZYNQMP_DP_CORE_ID_MAJOR_MASK GENMASK(31, 24)
87#define ZYNQMP_DP_CORE_ID_MAJOR_SHIFT 24
88#define ZYNQMP_DP_CORE_ID_MINOR_MASK GENMASK(23, 16)
89#define ZYNQMP_DP_CORE_ID_MINOR_SHIFT 16
90#define ZYNQMP_DP_CORE_ID_REVISION_MASK GENMASK(15, 8)
91#define ZYNQMP_DP_CORE_ID_REVISION_SHIFT 8
92#define ZYNQMP_DP_CORE_ID_DIRECTION GENMASK(1)
93
94/* AUX channel interface registers */
95#define ZYNQMP_DP_AUX_COMMAND 0x100
96#define ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT 8
97#define ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY BIT(12)
98#define ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT 0
99#define ZYNQMP_DP_AUX_WRITE_FIFO 0x104
100#define ZYNQMP_DP_AUX_ADDRESS 0x108
101#define ZYNQMP_DP_AUX_CLK_DIVIDER 0x10c
102#define ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT 8
103#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE 0x130
104#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD BIT(0)
105#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST BIT(1)
106#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY BIT(2)
107#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT BIT(3)
108#define ZYNQMP_DP_AUX_REPLY_DATA 0x134
109#define ZYNQMP_DP_AUX_REPLY_CODE 0x138
110#define ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK (0)
111#define ZYNQMP_DP_AUX_REPLY_CODE_AUX_NACK BIT(0)
112#define ZYNQMP_DP_AUX_REPLY_CODE_AUX_DEFER BIT(1)
113#define ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK (0)
114#define ZYNQMP_DP_AUX_REPLY_CODE_I2C_NACK BIT(2)
115#define ZYNQMP_DP_AUX_REPLY_CODE_I2C_DEFER BIT(3)
116#define ZYNQMP_DP_AUX_REPLY_COUNT 0x13c
117#define ZYNQMP_DP_REPLY_DATA_COUNT 0x148
118#define ZYNQMP_DP_REPLY_DATA_COUNT_MASK 0xff
119#define ZYNQMP_DP_INT_STATUS 0x3a0
120#define ZYNQMP_DP_INT_MASK 0x3a4
121#define ZYNQMP_DP_INT_EN 0x3a8
122#define ZYNQMP_DP_INT_DS 0x3ac
123#define ZYNQMP_DP_INT_HPD_IRQ BIT(0)
124#define ZYNQMP_DP_INT_HPD_EVENT BIT(1)
125#define ZYNQMP_DP_INT_REPLY_RECEIVED BIT(2)
126#define ZYNQMP_DP_INT_REPLY_TIMEOUT BIT(3)
127#define ZYNQMP_DP_INT_HPD_PULSE_DET BIT(4)
128#define ZYNQMP_DP_INT_EXT_PKT_TXD BIT(5)
129#define ZYNQMP_DP_INT_LIV_ABUF_UNDRFLW BIT(12)
130#define ZYNQMP_DP_INT_VBLANK_START BIT(13)
131#define ZYNQMP_DP_INT_PIXEL1_MATCH BIT(14)
132#define ZYNQMP_DP_INT_PIXEL0_MATCH BIT(15)
133#define ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK 0x3f0000
134#define ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK 0xfc00000
135#define ZYNQMP_DP_INT_CUST_TS_2 BIT(28)
136#define ZYNQMP_DP_INT_CUST_TS BIT(29)
137#define ZYNQMP_DP_INT_EXT_VSYNC_TS BIT(30)
138#define ZYNQMP_DP_INT_VSYNC_TS BIT(31)
139#define ZYNQMP_DP_INT_ALL (ZYNQMP_DP_INT_HPD_IRQ | \
140 ZYNQMP_DP_INT_HPD_EVENT | \
141 ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK | \
142 ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK)
143
144/* Main stream attribute registers */
145#define ZYNQMP_DP_MAIN_STREAM_HTOTAL 0x180
146#define ZYNQMP_DP_MAIN_STREAM_VTOTAL 0x184
147#define ZYNQMP_DP_MAIN_STREAM_POLARITY 0x188
148#define ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT 0
149#define ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT 1
150#define ZYNQMP_DP_MAIN_STREAM_HSWIDTH 0x18c
151#define ZYNQMP_DP_MAIN_STREAM_VSWIDTH 0x190
152#define ZYNQMP_DP_MAIN_STREAM_HRES 0x194
153#define ZYNQMP_DP_MAIN_STREAM_VRES 0x198
154#define ZYNQMP_DP_MAIN_STREAM_HSTART 0x19c
155#define ZYNQMP_DP_MAIN_STREAM_VSTART 0x1a0
156#define ZYNQMP_DP_MAIN_STREAM_MISC0 0x1a4
157#define ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK BIT(0)
158#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB (0 << 1)
159#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422 (5 << 1)
160#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444 (6 << 1)
161#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK (7 << 1)
162#define ZYNQMP_DP_MAIN_STREAM_MISC0_DYNAMIC_RANGE BIT(3)
163#define ZYNQMP_DP_MAIN_STREAM_MISC0_YCBCR_COLR BIT(4)
164#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6 (0 << 5)
165#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8 (1 << 5)
166#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10 (2 << 5)
167#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12 (3 << 5)
168#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16 (4 << 5)
169#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK (7 << 5)
170#define ZYNQMP_DP_MAIN_STREAM_MISC1 0x1a8
171#define ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN BIT(7)
172#define ZYNQMP_DP_MAIN_STREAM_M_VID 0x1ac
173#define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE 0x1b0
174#define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF 64
175#define ZYNQMP_DP_MAIN_STREAM_N_VID 0x1b4
176#define ZYNQMP_DP_USER_PIX_WIDTH 0x1b8
177#define ZYNQMP_DP_USER_DATA_COUNT_PER_LANE 0x1bc
178#define ZYNQMP_DP_MIN_BYTES_PER_TU 0x1c4
179#define ZYNQMP_DP_FRAC_BYTES_PER_TU 0x1c8
180#define ZYNQMP_DP_INIT_WAIT 0x1cc
181
182/* PHY configuration and status registers */
183#define ZYNQMP_DP_PHY_RESET 0x200
184#define ZYNQMP_DP_PHY_RESET_PHY_RESET BIT(0)
185#define ZYNQMP_DP_PHY_RESET_GTTX_RESET BIT(1)
186#define ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET BIT(8)
187#define ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET BIT(9)
188#define ZYNQMP_DP_PHY_RESET_ALL_RESET (ZYNQMP_DP_PHY_RESET_PHY_RESET | \
189 ZYNQMP_DP_PHY_RESET_GTTX_RESET | \
190 ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET | \
191 ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET)
192#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_0 0x210
193#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_1 0x214
194#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_2 0x218
195#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_3 0x21c
196#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_0 0x220
197#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_1 0x224
198#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_2 0x228
199#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_3 0x22c
200#define ZYNQMP_DP_PHY_CLOCK_SELECT 0x234
201#define ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G 0x1
202#define ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G 0x3
203#define ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G 0x5
204#define ZYNQMP_DP_TX_PHY_POWER_DOWN 0x238
205#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_0 BIT(0)
206#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_1 BIT(1)
207#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_2 BIT(2)
208#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_3 BIT(3)
209#define ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL 0xf
210#define ZYNQMP_DP_PHY_PRECURSOR_LANE_0 0x23c
211#define ZYNQMP_DP_PHY_PRECURSOR_LANE_1 0x240
212#define ZYNQMP_DP_PHY_PRECURSOR_LANE_2 0x244
213#define ZYNQMP_DP_PHY_PRECURSOR_LANE_3 0x248
214#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_0 0x24c
215#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_1 0x250
216#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_2 0x254
217#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_3 0x258
218#define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 0x24c
219#define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_1 0x250
220#define ZYNQMP_DP_PHY_STATUS 0x280
221#define ZYNQMP_DP_PHY_STATUS_PLL_LOCKED_SHIFT 4
222#define ZYNQMP_DP_PHY_STATUS_FPGA_PLL_LOCKED BIT(6)
223
224/* Audio registers */
225#define ZYNQMP_DP_TX_AUDIO_CONTROL 0x300
226#define ZYNQMP_DP_TX_AUDIO_CHANNELS 0x304
227#define ZYNQMP_DP_TX_AUDIO_INFO_DATA 0x308
228#define ZYNQMP_DP_TX_M_AUD 0x328
229#define ZYNQMP_DP_TX_N_AUD 0x32c
230#define ZYNQMP_DP_TX_AUDIO_EXT_DATA 0x330
231
232#define ZYNQMP_DP_MAX_LANES 2
233#define ZYNQMP_MAX_FREQ 3000000
234
235#define DP_REDUCED_BIT_RATE 162000
236#define DP_HIGH_BIT_RATE 270000
237#define DP_HIGH_BIT_RATE2 540000
238#define DP_MAX_TRAINING_TRIES 5
239#define DP_V1_2 0x12
240
241/**
242 * struct zynqmp_dp_link_config - Common link config between source and sink
243 * @max_rate: maximum link rate
244 * @max_lanes: maximum number of lanes
245 */
246struct zynqmp_dp_link_config {
247 int max_rate;
248 u8 max_lanes;
249};
250
251/**
252 * struct zynqmp_dp_mode - Configured mode of DisplayPort
253 * @bw_code: code for bandwidth(link rate)
254 * @lane_cnt: number of lanes
255 * @pclock: pixel clock frequency of current mode
256 * @fmt: format identifier string
257 */
258struct zynqmp_dp_mode {
259 u8 bw_code;
260 u8 lane_cnt;
261 int pclock;
262 const char *fmt;
263};
264
265/**
266 * struct zynqmp_dp_config - Configuration of DisplayPort from DTS
267 * @misc0: misc0 configuration (per DP v1.2 spec)
268 * @misc1: misc1 configuration (per DP v1.2 spec)
269 * @bpp: bits per pixel
270 */
271struct zynqmp_dp_config {
272 u8 misc0;
273 u8 misc1;
274 u8 bpp;
275};
276
277/**
278 * struct zynqmp_dp - Xilinx DisplayPort core
279 * @encoder: the drm encoder structure
280 * @connector: the drm connector structure
281 * @dev: device structure
282 * @dpsub: Display subsystem
283 * @drm: DRM core
284 * @iomem: device I/O memory for register access
285 * @reset: reset controller
286 * @irq: irq
287 * @config: IP core configuration from DTS
288 * @aux: aux channel
289 * @phy: PHY handles for DP lanes
290 * @num_lanes: number of enabled phy lanes
291 * @hpd_work: hot plug detection worker
292 * @status: connection status
293 * @enabled: flag to indicate if the device is enabled
294 * @dpcd: DP configuration data from currently connected sink device
295 * @link_config: common link configuration between IP core and sink device
296 * @mode: current mode between IP core and sink device
297 * @train_set: set of training data
298 */
299struct zynqmp_dp {
300 struct drm_encoder encoder;
301 struct drm_connector connector;
302 struct device *dev;
303 struct zynqmp_dpsub *dpsub;
304 struct drm_device *drm;
305 void __iomem *iomem;
306 struct reset_control *reset;
307 int irq;
308
309 struct zynqmp_dp_config config;
310 struct drm_dp_aux aux;
311 struct phy *phy[ZYNQMP_DP_MAX_LANES];
312 u8 num_lanes;
313 struct delayed_work hpd_work;
314 enum drm_connector_status status;
315 bool enabled;
316
317 u8 dpcd[DP_RECEIVER_CAP_SIZE];
318 struct zynqmp_dp_link_config link_config;
319 struct zynqmp_dp_mode mode;
320 u8 train_set[ZYNQMP_DP_MAX_LANES];
321};
322
323static inline struct zynqmp_dp *encoder_to_dp(struct drm_encoder *encoder)
324{
325 return container_of(encoder, struct zynqmp_dp, encoder);
326}
327
328static inline struct zynqmp_dp *connector_to_dp(struct drm_connector *connector)
329{
330 return container_of(connector, struct zynqmp_dp, connector);
331}
332
333static void zynqmp_dp_write(struct zynqmp_dp *dp, int offset, u32 val)
334{
335 writel(val, dp->iomem + offset);
336}
337
338static u32 zynqmp_dp_read(struct zynqmp_dp *dp, int offset)
339{
340 return readl(dp->iomem + offset);
341}
342
343static void zynqmp_dp_clr(struct zynqmp_dp *dp, int offset, u32 clr)
344{
345 zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) & ~clr);
346}
347
348static void zynqmp_dp_set(struct zynqmp_dp *dp, int offset, u32 set)
349{
350 zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) | set);
351}
352
353/* -----------------------------------------------------------------------------
354 * PHY Handling
355 */
356
357#define RST_TIMEOUT_MS 1000
358
359static int zynqmp_dp_reset(struct zynqmp_dp *dp, bool assert)
360{
361 unsigned long timeout;
362
363 if (assert)
364 reset_control_assert(dp->reset);
365 else
366 reset_control_deassert(dp->reset);
367
368 /* Wait for the (de)assert to complete. */
369 timeout = jiffies + msecs_to_jiffies(RST_TIMEOUT_MS);
370 while (!time_after_eq(jiffies, timeout)) {
371 bool status = !!reset_control_status(dp->reset);
372
373 if (assert == status)
374 return 0;
375
376 cpu_relax();
377 }
378
379 dev_err(dp->dev, "reset %s timeout\n", assert ? "assert" : "deassert");
380 return -ETIMEDOUT;
381}
382
383/**
384 * zynqmp_dp_phy_init - Initialize the phy
385 * @dp: DisplayPort IP core structure
386 *
387 * Initialize the phy.
388 *
389 * Return: 0 if the phy instances are initialized correctly, or the error code
390 * returned from the callee functions.
391 */
392static int zynqmp_dp_phy_init(struct zynqmp_dp *dp)
393{
394 int ret;
395 int i;
396
397 for (i = 0; i < dp->num_lanes; i++) {
398 ret = phy_init(dp->phy[i]);
399 if (ret) {
400 dev_err(dp->dev, "failed to init phy lane %d\n", i);
401 return ret;
402 }
403 }
404
405 ret = zynqmp_dp_reset(dp, false);
406 if (ret < 0)
407 return ret;
408
409 zynqmp_dp_clr(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET);
410
411 /*
412 * Power on lanes in reverse order as only lane 0 waits for the PLL to
413 * lock.
414 */
415 for (i = dp->num_lanes - 1; i >= 0; i--) {
416 ret = phy_power_on(dp->phy[i]);
417 if (ret) {
418 dev_err(dp->dev, "failed to power on phy lane %d\n", i);
419 return ret;
420 }
421 }
422
423 return 0;
424}
425
426/**
427 * zynqmp_dp_phy_exit - Exit the phy
428 * @dp: DisplayPort IP core structure
429 *
430 * Exit the phy.
431 */
432static void zynqmp_dp_phy_exit(struct zynqmp_dp *dp)
433{
434 unsigned int i;
435 int ret;
436
437 for (i = 0; i < dp->num_lanes; i++) {
438 ret = phy_power_off(dp->phy[i]);
439 if (ret)
440 dev_err(dp->dev, "failed to power off phy(%d) %d\n", i,
441 ret);
442 }
443
444 zynqmp_dp_reset(dp, true);
445
446 for (i = 0; i < dp->num_lanes; i++) {
447 ret = phy_exit(dp->phy[i]);
448 if (ret)
449 dev_err(dp->dev, "failed to exit phy(%d) %d\n", i, ret);
450 }
451}
452
453/**
454 * zynqmp_dp_phy_probe - Probe the PHYs
455 * @dp: DisplayPort IP core structure
456 *
457 * Probe PHYs for all lanes. Less PHYs may be available than the number of
458 * lanes, which is not considered an error as long as at least one PHY is
459 * found. The caller can check dp->num_lanes to check how many PHYs were found.
460 *
461 * Return:
462 * * 0 - Success
463 * * -ENXIO - No PHY found
464 * * -EPROBE_DEFER - Probe deferral requested
465 * * Other negative value - PHY retrieval failure
466 */
467static int zynqmp_dp_phy_probe(struct zynqmp_dp *dp)
468{
469 unsigned int i;
470
471 for (i = 0; i < ZYNQMP_DP_MAX_LANES; i++) {
472 char phy_name[16];
473 struct phy *phy;
474
475 snprintf(phy_name, sizeof(phy_name), "dp-phy%d", i);
476 phy = devm_phy_get(dp->dev, phy_name);
477
478 if (IS_ERR(phy)) {
479 switch (PTR_ERR(phy)) {
480 case -ENODEV:
481 if (dp->num_lanes)
482 return 0;
483
484 dev_err(dp->dev, "no PHY found\n");
485 return -ENXIO;
486
487 case -EPROBE_DEFER:
488 return -EPROBE_DEFER;
489
490 default:
491 dev_err(dp->dev, "failed to get PHY lane %u\n",
492 i);
493 return PTR_ERR(phy);
494 }
495 }
496
497 dp->phy[i] = phy;
498 dp->num_lanes++;
499 }
500
501 return 0;
502}
503
504/**
505 * zynqmp_dp_phy_ready - Check if PHY is ready
506 * @dp: DisplayPort IP core structure
507 *
508 * Check if PHY is ready. If PHY is not ready, wait 1ms to check for 100 times.
509 * This amount of delay was suggested by IP designer.
510 *
511 * Return: 0 if PHY is ready, or -ENODEV if PHY is not ready.
512 */
513static int zynqmp_dp_phy_ready(struct zynqmp_dp *dp)
514{
515 u32 i, reg, ready;
516
517 ready = (1 << dp->num_lanes) - 1;
518
519 /* Wait for 100 * 1ms. This should be enough time for PHY to be ready */
520 for (i = 0; ; i++) {
521 reg = zynqmp_dp_read(dp, ZYNQMP_DP_PHY_STATUS);
522 if ((reg & ready) == ready)
523 return 0;
524
525 if (i == 100) {
526 dev_err(dp->dev, "PHY isn't ready\n");
527 return -ENODEV;
528 }
529
530 usleep_range(1000, 1100);
531 }
532
533 return 0;
534}
535
536/* -----------------------------------------------------------------------------
537 * DisplayPort Link Training
538 */
539
540/**
541 * zynqmp_dp_max_rate - Calculate and return available max pixel clock
542 * @link_rate: link rate (Kilo-bytes / sec)
543 * @lane_num: number of lanes
544 * @bpp: bits per pixel
545 *
546 * Return: max pixel clock (KHz) supported by current link config.
547 */
548static inline int zynqmp_dp_max_rate(int link_rate, u8 lane_num, u8 bpp)
549{
550 return link_rate * lane_num * 8 / bpp;
551}
552
553/**
554 * zynqmp_dp_mode_configure - Configure the link values
555 * @dp: DisplayPort IP core structure
556 * @pclock: pixel clock for requested display mode
557 * @current_bw: current link rate
558 *
559 * Find the link configuration values, rate and lane count for requested pixel
560 * clock @pclock. The @pclock is stored in the mode to be used in other
561 * functions later. The returned rate is downshifted from the current rate
562 * @current_bw.
563 *
564 * Return: Current link rate code, or -EINVAL.
565 */
566static int zynqmp_dp_mode_configure(struct zynqmp_dp *dp, int pclock,
567 u8 current_bw)
568{
569 int max_rate = dp->link_config.max_rate;
570 u8 bw_code;
571 u8 max_lanes = dp->link_config.max_lanes;
572 u8 max_link_rate_code = drm_dp_link_rate_to_bw_code(max_rate);
573 u8 bpp = dp->config.bpp;
574 u8 lane_cnt;
575
576 /* Downshift from current bandwidth */
577 switch (current_bw) {
578 case DP_LINK_BW_5_4:
579 bw_code = DP_LINK_BW_2_7;
580 break;
581 case DP_LINK_BW_2_7:
582 bw_code = DP_LINK_BW_1_62;
583 break;
584 case DP_LINK_BW_1_62:
585 dev_err(dp->dev, "can't downshift. already lowest link rate\n");
586 return -EINVAL;
587 default:
588 /* If not given, start with max supported */
589 bw_code = max_link_rate_code;
590 break;
591 }
592
593 for (lane_cnt = 1; lane_cnt <= max_lanes; lane_cnt <<= 1) {
594 int bw;
595 u32 rate;
596
597 bw = drm_dp_bw_code_to_link_rate(bw_code);
598 rate = zynqmp_dp_max_rate(bw, lane_cnt, bpp);
599 if (pclock <= rate) {
600 dp->mode.bw_code = bw_code;
601 dp->mode.lane_cnt = lane_cnt;
602 dp->mode.pclock = pclock;
603 return dp->mode.bw_code;
604 }
605 }
606
607 dev_err(dp->dev, "failed to configure link values\n");
608
609 return -EINVAL;
610}
611
612/**
613 * zynqmp_dp_adjust_train - Adjust train values
614 * @dp: DisplayPort IP core structure
615 * @link_status: link status from sink which contains requested training values
616 */
617static void zynqmp_dp_adjust_train(struct zynqmp_dp *dp,
618 u8 link_status[DP_LINK_STATUS_SIZE])
619{
620 u8 *train_set = dp->train_set;
621 u8 voltage = 0, preemphasis = 0;
622 u8 i;
623
624 for (i = 0; i < dp->mode.lane_cnt; i++) {
625 u8 v = drm_dp_get_adjust_request_voltage(link_status, i);
626 u8 p = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
627
628 if (v > voltage)
629 voltage = v;
630
631 if (p > preemphasis)
632 preemphasis = p;
633 }
634
635 if (voltage >= DP_TRAIN_VOLTAGE_SWING_LEVEL_3)
636 voltage |= DP_TRAIN_MAX_SWING_REACHED;
637
638 if (preemphasis >= DP_TRAIN_PRE_EMPH_LEVEL_2)
639 preemphasis |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
640
641 for (i = 0; i < dp->mode.lane_cnt; i++)
642 train_set[i] = voltage | preemphasis;
643}
644
645/**
646 * zynqmp_dp_update_vs_emph - Update the training values
647 * @dp: DisplayPort IP core structure
648 *
649 * Update the training values based on the request from sink. The mapped values
650 * are predefined, and values(vs, pe, pc) are from the device manual.
651 *
652 * Return: 0 if vs and emph are updated successfully, or the error code returned
653 * by drm_dp_dpcd_write().
654 */
655static int zynqmp_dp_update_vs_emph(struct zynqmp_dp *dp)
656{
657 unsigned int i;
658 int ret;
659
660 ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, dp->train_set,
661 dp->mode.lane_cnt);
662 if (ret < 0)
663 return ret;
664
665 for (i = 0; i < dp->mode.lane_cnt; i++) {
666 u32 reg = ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 + i * 4;
667 union phy_configure_opts opts = { 0 };
668 u8 train = dp->train_set[i];
669
670 opts.dp.voltage[0] = (train & DP_TRAIN_VOLTAGE_SWING_MASK)
671 >> DP_TRAIN_VOLTAGE_SWING_SHIFT;
672 opts.dp.pre[0] = (train & DP_TRAIN_PRE_EMPHASIS_MASK)
673 >> DP_TRAIN_PRE_EMPHASIS_SHIFT;
674
675 phy_configure(dp->phy[i], &opts);
676
677 zynqmp_dp_write(dp, reg, 0x2);
678 }
679
680 return 0;
681}
682
683/**
684 * zynqmp_dp_link_train_cr - Train clock recovery
685 * @dp: DisplayPort IP core structure
686 *
687 * Return: 0 if clock recovery train is done successfully, or corresponding
688 * error code.
689 */
690static int zynqmp_dp_link_train_cr(struct zynqmp_dp *dp)
691{
692 u8 link_status[DP_LINK_STATUS_SIZE];
693 u8 lane_cnt = dp->mode.lane_cnt;
694 u8 vs = 0, tries = 0;
695 u16 max_tries, i;
696 bool cr_done;
697 int ret;
698
699 zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET,
700 DP_TRAINING_PATTERN_1);
701 ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
702 DP_TRAINING_PATTERN_1 |
703 DP_LINK_SCRAMBLING_DISABLE);
704 if (ret < 0)
705 return ret;
706
707 /*
708 * 256 loops should be maximum iterations for 4 lanes and 4 values.
709 * So, This loop should exit before 512 iterations
710 */
711 for (max_tries = 0; max_tries < 512; max_tries++) {
712 ret = zynqmp_dp_update_vs_emph(dp);
713 if (ret)
714 return ret;
715
716 drm_dp_link_train_clock_recovery_delay(dp->dpcd);
717 ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
718 if (ret < 0)
719 return ret;
720
721 cr_done = drm_dp_clock_recovery_ok(link_status, lane_cnt);
722 if (cr_done)
723 break;
724
725 for (i = 0; i < lane_cnt; i++)
726 if (!(dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED))
727 break;
728 if (i == lane_cnt)
729 break;
730
731 if ((dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == vs)
732 tries++;
733 else
734 tries = 0;
735
736 if (tries == DP_MAX_TRAINING_TRIES)
737 break;
738
739 vs = dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
740 zynqmp_dp_adjust_train(dp, link_status);
741 }
742
743 if (!cr_done)
744 return -EIO;
745
746 return 0;
747}
748
749/**
750 * zynqmp_dp_link_train_ce - Train channel equalization
751 * @dp: DisplayPort IP core structure
752 *
753 * Return: 0 if channel equalization train is done successfully, or
754 * corresponding error code.
755 */
756static int zynqmp_dp_link_train_ce(struct zynqmp_dp *dp)
757{
758 u8 link_status[DP_LINK_STATUS_SIZE];
759 u8 lane_cnt = dp->mode.lane_cnt;
760 u32 pat, tries;
761 int ret;
762 bool ce_done;
763
764 if (dp->dpcd[DP_DPCD_REV] >= DP_V1_2 &&
765 dp->dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED)
766 pat = DP_TRAINING_PATTERN_3;
767 else
768 pat = DP_TRAINING_PATTERN_2;
769
770 zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, pat);
771 ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
772 pat | DP_LINK_SCRAMBLING_DISABLE);
773 if (ret < 0)
774 return ret;
775
776 for (tries = 0; tries < DP_MAX_TRAINING_TRIES; tries++) {
777 ret = zynqmp_dp_update_vs_emph(dp);
778 if (ret)
779 return ret;
780
781 drm_dp_link_train_channel_eq_delay(dp->dpcd);
782 ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
783 if (ret < 0)
784 return ret;
785
786 ce_done = drm_dp_channel_eq_ok(link_status, lane_cnt);
787 if (ce_done)
788 break;
789
790 zynqmp_dp_adjust_train(dp, link_status);
791 }
792
793 if (!ce_done)
794 return -EIO;
795
796 return 0;
797}
798
799/**
800 * zynqmp_dp_link_train - Train the link
801 * @dp: DisplayPort IP core structure
802 *
803 * Return: 0 if all trains are done successfully, or corresponding error code.
804 */
805static int zynqmp_dp_train(struct zynqmp_dp *dp)
806{
807 u32 reg;
808 u8 bw_code = dp->mode.bw_code;
809 u8 lane_cnt = dp->mode.lane_cnt;
810 u8 aux_lane_cnt = lane_cnt;
811 bool enhanced;
812 int ret;
813
814 zynqmp_dp_write(dp, ZYNQMP_DP_LANE_COUNT_SET, lane_cnt);
815 enhanced = drm_dp_enhanced_frame_cap(dp->dpcd);
816 if (enhanced) {
817 zynqmp_dp_write(dp, ZYNQMP_DP_ENHANCED_FRAME_EN, 1);
818 aux_lane_cnt |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
819 }
820
821 if (dp->dpcd[3] & 0x1) {
822 zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 1);
823 drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL,
824 DP_SPREAD_AMP_0_5);
825 } else {
826 zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 0);
827 drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, 0);
828 }
829
830 ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, aux_lane_cnt);
831 if (ret < 0) {
832 dev_err(dp->dev, "failed to set lane count\n");
833 return ret;
834 }
835
836 ret = drm_dp_dpcd_writeb(&dp->aux, DP_MAIN_LINK_CHANNEL_CODING_SET,
837 DP_SET_ANSI_8B10B);
838 if (ret < 0) {
839 dev_err(dp->dev, "failed to set ANSI 8B/10B encoding\n");
840 return ret;
841 }
842
843 ret = drm_dp_dpcd_writeb(&dp->aux, DP_LINK_BW_SET, bw_code);
844 if (ret < 0) {
845 dev_err(dp->dev, "failed to set DP bandwidth\n");
846 return ret;
847 }
848
849 zynqmp_dp_write(dp, ZYNQMP_DP_LINK_BW_SET, bw_code);
850 switch (bw_code) {
851 case DP_LINK_BW_1_62:
852 reg = ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G;
853 break;
854 case DP_LINK_BW_2_7:
855 reg = ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G;
856 break;
857 case DP_LINK_BW_5_4:
858 default:
859 reg = ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G;
860 break;
861 }
862
863 zynqmp_dp_write(dp, ZYNQMP_DP_PHY_CLOCK_SELECT, reg);
864 ret = zynqmp_dp_phy_ready(dp);
865 if (ret < 0)
866 return ret;
867
868 zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 1);
869 memset(dp->train_set, 0, 4);
870 ret = zynqmp_dp_link_train_cr(dp);
871 if (ret)
872 return ret;
873
874 ret = zynqmp_dp_link_train_ce(dp);
875 if (ret)
876 return ret;
877
878 ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
879 DP_TRAINING_PATTERN_DISABLE);
880 if (ret < 0) {
881 dev_err(dp->dev, "failed to disable training pattern\n");
882 return ret;
883 }
884 zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET,
885 DP_TRAINING_PATTERN_DISABLE);
886
887 zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 0);
888
889 return 0;
890}
891
892/**
893 * zynqmp_dp_train_loop - Downshift the link rate during training
894 * @dp: DisplayPort IP core structure
895 *
896 * Train the link by downshifting the link rate if training is not successful.
897 */
898static void zynqmp_dp_train_loop(struct zynqmp_dp *dp)
899{
900 struct zynqmp_dp_mode *mode = &dp->mode;
901 u8 bw = mode->bw_code;
902 int ret;
903
904 do {
905 if (dp->status == connector_status_disconnected ||
906 !dp->enabled)
907 return;
908
909 ret = zynqmp_dp_train(dp);
910 if (!ret)
911 return;
912
913 ret = zynqmp_dp_mode_configure(dp, mode->pclock, bw);
914 if (ret < 0)
915 goto err_out;
916
917 bw = ret;
918 } while (bw >= DP_LINK_BW_1_62);
919
920err_out:
921 dev_err(dp->dev, "failed to train the DP link\n");
922}
923
924/* -----------------------------------------------------------------------------
925 * DisplayPort AUX
926 */
927
928#define AUX_READ_BIT 0x1
929
930/**
931 * zynqmp_dp_aux_cmd_submit - Submit aux command
932 * @dp: DisplayPort IP core structure
933 * @cmd: aux command
934 * @addr: aux address
935 * @buf: buffer for command data
936 * @bytes: number of bytes for @buf
937 * @reply: reply code to be returned
938 *
939 * Submit an aux command. All aux related commands, native or i2c aux
940 * read/write, are submitted through this function. The function is mapped to
941 * the transfer function of struct drm_dp_aux. This function involves in
942 * multiple register reads/writes, thus synchronization is needed, and it is
943 * done by drm_dp_helper using @hw_mutex. The calling thread goes into sleep
944 * if there's no immediate reply to the command submission. The reply code is
945 * returned at @reply if @reply != NULL.
946 *
947 * Return: 0 if the command is submitted properly, or corresponding error code:
948 * -EBUSY when there is any request already being processed
949 * -ETIMEDOUT when receiving reply is timed out
950 * -EIO when received bytes are less than requested
951 */
952static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp *dp, u32 cmd, u16 addr,
953 u8 *buf, u8 bytes, u8 *reply)
954{
955 bool is_read = (cmd & AUX_READ_BIT) ? true : false;
956 u32 reg, i;
957
958 reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
959 if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST)
960 return -EBUSY;
961
962 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_ADDRESS, addr);
963 if (!is_read)
964 for (i = 0; i < bytes; i++)
965 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_WRITE_FIFO,
966 buf[i]);
967
968 reg = cmd << ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT;
969 if (!buf || !bytes)
970 reg |= ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY;
971 else
972 reg |= (bytes - 1) << ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT;
973 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_COMMAND, reg);
974
975 /* Wait for reply to be delivered upto 2ms */
976 for (i = 0; ; i++) {
977 reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
978 if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY)
979 break;
980
981 if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT ||
982 i == 2)
983 return -ETIMEDOUT;
984
985 usleep_range(1000, 1100);
986 }
987
988 reg = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_CODE);
989 if (reply)
990 *reply = reg;
991
992 if (is_read &&
993 (reg == ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK ||
994 reg == ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK)) {
995 reg = zynqmp_dp_read(dp, ZYNQMP_DP_REPLY_DATA_COUNT);
996 if ((reg & ZYNQMP_DP_REPLY_DATA_COUNT_MASK) != bytes)
997 return -EIO;
998
999 for (i = 0; i < bytes; i++)
1000 buf[i] = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_DATA);
1001 }
1002
1003 return 0;
1004}
1005
1006static ssize_t
1007zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
1008{
1009 struct zynqmp_dp *dp = container_of(aux, struct zynqmp_dp, aux);
1010 int ret;
1011 unsigned int i, iter;
1012
1013 /* Number of loops = timeout in msec / aux delay (400 usec) */
1014 iter = zynqmp_dp_aux_timeout_ms * 1000 / 400;
1015 iter = iter ? iter : 1;
1016
1017 for (i = 0; i < iter; i++) {
1018 ret = zynqmp_dp_aux_cmd_submit(dp, msg->request, msg->address,
1019 msg->buffer, msg->size,
1020 &msg->reply);
1021 if (!ret) {
1022 dev_dbg(dp->dev, "aux %d retries\n", i);
1023 return msg->size;
1024 }
1025
1026 if (dp->status == connector_status_disconnected) {
1027 dev_dbg(dp->dev, "no connected aux device\n");
1028 return -ENODEV;
1029 }
1030
1031 usleep_range(400, 500);
1032 }
1033
1034 dev_dbg(dp->dev, "failed to do aux transfer (%d)\n", ret);
1035
1036 return ret;
1037}
1038
1039/**
1040 * zynqmp_dp_aux_init - Initialize and register the DP AUX
1041 * @dp: DisplayPort IP core structure
1042 *
1043 * Program the AUX clock divider and filter and register the DP AUX adapter.
1044 *
1045 * Return: 0 on success, error value otherwise
1046 */
1047static int zynqmp_dp_aux_init(struct zynqmp_dp *dp)
1048{
1049 unsigned long rate;
1050 unsigned int w;
1051
1052 /*
1053 * The AUX_SIGNAL_WIDTH_FILTER is the number of APB clock cycles
1054 * corresponding to the AUX pulse. Allowable values are 8, 16, 24, 32,
1055 * 40 and 48. The AUX pulse width must be between 0.4µs and 0.6µs,
1056 * compute the w / 8 value corresponding to 0.4µs rounded up, and make
1057 * sure it stays below 0.6µs and within the allowable values.
1058 */
1059 rate = clk_get_rate(dp->dpsub->apb_clk);
1060 w = DIV_ROUND_UP(4 * rate, 1000 * 1000 * 10 * 8) * 8;
1061 if (w > 6 * rate / (1000 * 1000 * 10) || w > 48) {
1062 dev_err(dp->dev, "aclk frequency too high\n");
1063 return -EINVAL;
1064 }
1065
1066 zynqmp_dp_write(dp, ZYNQMP_DP_AUX_CLK_DIVIDER,
1067 (w << ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT) |
1068 (rate / (1000 * 1000)));
1069
1070 dp->aux.name = "ZynqMP DP AUX";
1071 dp->aux.dev = dp->dev;
1072 dp->aux.transfer = zynqmp_dp_aux_transfer;
1073
1074 return drm_dp_aux_register(&dp->aux);
1075}
1076
1077/**
1078 * zynqmp_dp_aux_cleanup - Cleanup the DP AUX
1079 * @dp: DisplayPort IP core structure
1080 *
1081 * Unregister the DP AUX adapter.
1082 */
1083static void zynqmp_dp_aux_cleanup(struct zynqmp_dp *dp)
1084{
1085 drm_dp_aux_unregister(&dp->aux);
1086}
1087
1088/* -----------------------------------------------------------------------------
1089 * DisplayPort Generic Support
1090 */
1091
1092/**
1093 * zynqmp_dp_update_misc - Write the misc registers
1094 * @dp: DisplayPort IP core structure
1095 *
1096 * The misc register values are stored in the structure, and this
1097 * function applies the values into the registers.
1098 */
1099static void zynqmp_dp_update_misc(struct zynqmp_dp *dp)
1100{
1101 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC0, dp->config.misc0);
1102 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC1, dp->config.misc1);
1103}
1104
1105/**
1106 * zynqmp_dp_set_format - Set the input format
1107 * @dp: DisplayPort IP core structure
1108 * @format: input format
1109 * @bpc: bits per component
1110 *
1111 * Update misc register values based on input @format and @bpc.
1112 *
1113 * Return: 0 on success, or -EINVAL.
1114 */
1115static int zynqmp_dp_set_format(struct zynqmp_dp *dp,
1116 enum zynqmp_dpsub_format format,
1117 unsigned int bpc)
1118{
1119 static const struct drm_display_info *display;
1120 struct zynqmp_dp_config *config = &dp->config;
1121 unsigned int num_colors;
1122
1123 config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK;
1124 config->misc1 &= ~ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN;
1125
1126 switch (format) {
1127 case ZYNQMP_DPSUB_FORMAT_RGB:
1128 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB;
1129 num_colors = 3;
1130 break;
1131
1132 case ZYNQMP_DPSUB_FORMAT_YCRCB444:
1133 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444;
1134 num_colors = 3;
1135 break;
1136
1137 case ZYNQMP_DPSUB_FORMAT_YCRCB422:
1138 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422;
1139 num_colors = 2;
1140 break;
1141
1142 case ZYNQMP_DPSUB_FORMAT_YONLY:
1143 config->misc1 |= ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN;
1144 num_colors = 1;
1145 break;
1146
1147 default:
1148 dev_err(dp->dev, "Invalid colormetry in DT\n");
1149 return -EINVAL;
1150 }
1151
1152 display = &dp->connector.display_info;
1153 if (display->bpc && bpc > display->bpc) {
1154 dev_warn(dp->dev,
1155 "downgrading requested %ubpc to display limit %ubpc\n",
1156 bpc, display->bpc);
1157 bpc = display->bpc;
1158 }
1159
1160 config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK;
1161
1162 switch (bpc) {
1163 case 6:
1164 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6;
1165 break;
1166 case 8:
1167 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8;
1168 break;
1169 case 10:
1170 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10;
1171 break;
1172 case 12:
1173 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12;
1174 break;
1175 case 16:
1176 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16;
1177 break;
1178 default:
1179 dev_warn(dp->dev, "Not supported bpc (%u). fall back to 8bpc\n",
1180 bpc);
1181 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8;
1182 bpc = 8;
1183 break;
1184 }
1185
1186 /* Update the current bpp based on the format. */
1187 config->bpp = bpc * num_colors;
1188
1189 return 0;
1190}
1191
1192/**
1193 * zynqmp_dp_encoder_mode_set_transfer_unit - Set the transfer unit values
1194 * @dp: DisplayPort IP core structure
1195 * @mode: requested display mode
1196 *
1197 * Set the transfer unit, and calculate all transfer unit size related values.
1198 * Calculation is based on DP and IP core specification.
1199 */
1200static void
1201zynqmp_dp_encoder_mode_set_transfer_unit(struct zynqmp_dp *dp,
1202 struct drm_display_mode *mode)
1203{
1204 u32 tu = ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF;
1205 u32 bw, vid_kbytes, avg_bytes_per_tu, init_wait;
1206
1207 /* Use the max transfer unit size (default) */
1208 zynqmp_dp_write(dp, ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE, tu);
1209
1210 vid_kbytes = mode->clock * (dp->config.bpp / 8);
1211 bw = drm_dp_bw_code_to_link_rate(dp->mode.bw_code);
1212 avg_bytes_per_tu = vid_kbytes * tu / (dp->mode.lane_cnt * bw / 1000);
1213 zynqmp_dp_write(dp, ZYNQMP_DP_MIN_BYTES_PER_TU,
1214 avg_bytes_per_tu / 1000);
1215 zynqmp_dp_write(dp, ZYNQMP_DP_FRAC_BYTES_PER_TU,
1216 avg_bytes_per_tu % 1000);
1217
1218 /* Configure the initial wait cycle based on transfer unit size */
1219 if (tu < (avg_bytes_per_tu / 1000))
1220 init_wait = 0;
1221 else if ((avg_bytes_per_tu / 1000) <= 4)
1222 init_wait = tu;
1223 else
1224 init_wait = tu - avg_bytes_per_tu / 1000;
1225
1226 zynqmp_dp_write(dp, ZYNQMP_DP_INIT_WAIT, init_wait);
1227}
1228
1229/**
1230 * zynqmp_dp_encoder_mode_set_stream - Configure the main stream
1231 * @dp: DisplayPort IP core structure
1232 * @mode: requested display mode
1233 *
1234 * Configure the main stream based on the requested mode @mode. Calculation is
1235 * based on IP core specification.
1236 */
1237static void zynqmp_dp_encoder_mode_set_stream(struct zynqmp_dp *dp,
1238 const struct drm_display_mode *mode)
1239{
1240 u8 lane_cnt = dp->mode.lane_cnt;
1241 u32 reg, wpl;
1242 unsigned int rate;
1243
1244 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HTOTAL, mode->htotal);
1245 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VTOTAL, mode->vtotal);
1246 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_POLARITY,
1247 (!!(mode->flags & DRM_MODE_FLAG_PVSYNC) <<
1248 ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT) |
1249 (!!(mode->flags & DRM_MODE_FLAG_PHSYNC) <<
1250 ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT));
1251 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSWIDTH,
1252 mode->hsync_end - mode->hsync_start);
1253 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSWIDTH,
1254 mode->vsync_end - mode->vsync_start);
1255 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HRES, mode->hdisplay);
1256 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VRES, mode->vdisplay);
1257 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSTART,
1258 mode->htotal - mode->hsync_start);
1259 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSTART,
1260 mode->vtotal - mode->vsync_start);
1261
1262 /* In synchronous mode, set the diviers */
1263 if (dp->config.misc0 & ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK) {
1264 reg = drm_dp_bw_code_to_link_rate(dp->mode.bw_code);
1265 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_N_VID, reg);
1266 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_M_VID, mode->clock);
1267 rate = zynqmp_disp_get_audio_clk_rate(dp->dpsub->disp);
1268 if (rate) {
1269 dev_dbg(dp->dev, "Audio rate: %d\n", rate / 512);
1270 zynqmp_dp_write(dp, ZYNQMP_DP_TX_N_AUD, reg);
1271 zynqmp_dp_write(dp, ZYNQMP_DP_TX_M_AUD, rate / 1000);
1272 }
1273 }
1274
1275 /* Only 2 channel audio is supported now */
1276 if (zynqmp_disp_audio_enabled(dp->dpsub->disp))
1277 zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CHANNELS, 1);
1278
1279 zynqmp_dp_write(dp, ZYNQMP_DP_USER_PIX_WIDTH, 1);
1280
1281 /* Translate to the native 16 bit datapath based on IP core spec */
1282 wpl = (mode->hdisplay * dp->config.bpp + 15) / 16;
1283 reg = wpl + wpl % lane_cnt - lane_cnt;
1284 zynqmp_dp_write(dp, ZYNQMP_DP_USER_DATA_COUNT_PER_LANE, reg);
1285}
1286
1287/* -----------------------------------------------------------------------------
1288 * DRM Connector
1289 */
1290
1291static enum drm_connector_status
1292zynqmp_dp_connector_detect(struct drm_connector *connector, bool force)
1293{
1294 struct zynqmp_dp *dp = connector_to_dp(connector);
1295 struct zynqmp_dp_link_config *link_config = &dp->link_config;
1296 u32 state, i;
1297 int ret;
1298
1299 /*
1300 * This is from heuristic. It takes some delay (ex, 100 ~ 500 msec) to
1301 * get the HPD signal with some monitors.
1302 */
1303 for (i = 0; i < 10; i++) {
1304 state = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
1305 if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD)
1306 break;
1307 msleep(100);
1308 }
1309
1310 if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD) {
1311 ret = drm_dp_dpcd_read(&dp->aux, 0x0, dp->dpcd,
1312 sizeof(dp->dpcd));
1313 if (ret < 0) {
1314 dev_dbg(dp->dev, "DPCD read failed");
1315 goto disconnected;
1316 }
1317
1318 link_config->max_rate = min_t(int,
1319 drm_dp_max_link_rate(dp->dpcd),
1320 DP_HIGH_BIT_RATE2);
1321 link_config->max_lanes = min_t(u8,
1322 drm_dp_max_lane_count(dp->dpcd),
1323 dp->num_lanes);
1324
1325 dp->status = connector_status_connected;
1326 return connector_status_connected;
1327 }
1328
1329disconnected:
1330 dp->status = connector_status_disconnected;
1331 return connector_status_disconnected;
1332}
1333
1334static int zynqmp_dp_connector_get_modes(struct drm_connector *connector)
1335{
1336 struct zynqmp_dp *dp = connector_to_dp(connector);
1337 struct edid *edid;
1338 int ret;
1339
1340 edid = drm_get_edid(connector, &dp->aux.ddc);
1341 if (!edid)
1342 return 0;
1343
1344 drm_connector_update_edid_property(connector, edid);
1345 ret = drm_add_edid_modes(connector, edid);
1346 kfree(edid);
1347
1348 return ret;
1349}
1350
1351static struct drm_encoder *
1352zynqmp_dp_connector_best_encoder(struct drm_connector *connector)
1353{
1354 struct zynqmp_dp *dp = connector_to_dp(connector);
1355
1356 return &dp->encoder;
1357}
1358
1359static int zynqmp_dp_connector_mode_valid(struct drm_connector *connector,
1360 struct drm_display_mode *mode)
1361{
1362 struct zynqmp_dp *dp = connector_to_dp(connector);
1363 u8 max_lanes = dp->link_config.max_lanes;
1364 u8 bpp = dp->config.bpp;
1365 int max_rate = dp->link_config.max_rate;
1366 int rate;
1367
1368 if (mode->clock > ZYNQMP_MAX_FREQ) {
1369 dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n",
1370 mode->name);
1371 drm_mode_debug_printmodeline(mode);
1372 return MODE_CLOCK_HIGH;
1373 }
1374
1375 /* Check with link rate and lane count */
1376 rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp);
1377 if (mode->clock > rate) {
1378 dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n",
1379 mode->name);
1380 drm_mode_debug_printmodeline(mode);
1381 return MODE_CLOCK_HIGH;
1382 }
1383
1384 return MODE_OK;
1385}
1386
1387static const struct drm_connector_funcs zynqmp_dp_connector_funcs = {
1388 .detect = zynqmp_dp_connector_detect,
1389 .fill_modes = drm_helper_probe_single_connector_modes,
1390 .destroy = drm_connector_cleanup,
1391 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
1392 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
1393 .reset = drm_atomic_helper_connector_reset,
1394};
1395
1396static const struct drm_connector_helper_funcs
1397zynqmp_dp_connector_helper_funcs = {
1398 .get_modes = zynqmp_dp_connector_get_modes,
1399 .best_encoder = zynqmp_dp_connector_best_encoder,
1400 .mode_valid = zynqmp_dp_connector_mode_valid,
1401};
1402
1403/* -----------------------------------------------------------------------------
1404 * DRM Encoder
1405 */
1406
1407static void zynqmp_dp_encoder_enable(struct drm_encoder *encoder)
1408{
1409 struct zynqmp_dp *dp = encoder_to_dp(encoder);
1410 unsigned int i;
1411 int ret = 0;
1412
1413 pm_runtime_get_sync(dp->dev);
1414 dp->enabled = true;
1415 zynqmp_dp_update_misc(dp);
1416 if (zynqmp_disp_audio_enabled(dp->dpsub->disp))
1417 zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 1);
1418 zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, 0);
1419 if (dp->status == connector_status_connected) {
1420 for (i = 0; i < 3; i++) {
1421 ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER,
1422 DP_SET_POWER_D0);
1423 if (ret == 1)
1424 break;
1425 usleep_range(300, 500);
1426 }
1427 /* Some monitors take time to wake up properly */
1428 msleep(zynqmp_dp_power_on_delay_ms);
1429 }
1430 if (ret != 1)
1431 dev_dbg(dp->dev, "DP aux failed\n");
1432 else
1433 zynqmp_dp_train_loop(dp);
1434 zynqmp_dp_write(dp, ZYNQMP_DP_SOFTWARE_RESET,
1435 ZYNQMP_DP_SOFTWARE_RESET_ALL);
1436 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 1);
1437}
1438
1439static void zynqmp_dp_encoder_disable(struct drm_encoder *encoder)
1440{
1441 struct zynqmp_dp *dp = encoder_to_dp(encoder);
1442
1443 dp->enabled = false;
1444 cancel_delayed_work(&dp->hpd_work);
1445 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 0);
1446 drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
1447 zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN,
1448 ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL);
1449 if (zynqmp_disp_audio_enabled(dp->dpsub->disp))
1450 zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 0);
1451 pm_runtime_put_sync(dp->dev);
1452}
1453
1454static void
1455zynqmp_dp_encoder_atomic_mode_set(struct drm_encoder *encoder,
1456 struct drm_crtc_state *crtc_state,
1457 struct drm_connector_state *connector_state)
1458{
1459 struct zynqmp_dp *dp = encoder_to_dp(encoder);
1460 struct drm_display_mode *mode = &crtc_state->mode;
1461 struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
1462 u8 max_lanes = dp->link_config.max_lanes;
1463 u8 bpp = dp->config.bpp;
1464 int rate, max_rate = dp->link_config.max_rate;
1465 int ret;
1466
1467 zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8);
1468
1469 /* Check again as bpp or format might have been chagned */
1470 rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp);
1471 if (mode->clock > rate) {
1472 dev_err(dp->dev, "the mode, %s,has too high pixel rate\n",
1473 mode->name);
1474 drm_mode_debug_printmodeline(mode);
1475 }
1476
1477 ret = zynqmp_dp_mode_configure(dp, adjusted_mode->clock, 0);
1478 if (ret < 0)
1479 return;
1480
1481 zynqmp_dp_encoder_mode_set_transfer_unit(dp, adjusted_mode);
1482 zynqmp_dp_encoder_mode_set_stream(dp, adjusted_mode);
1483}
1484
1485#define ZYNQMP_DP_MIN_H_BACKPORCH 20
1486
1487static int
1488zynqmp_dp_encoder_atomic_check(struct drm_encoder *encoder,
1489 struct drm_crtc_state *crtc_state,
1490 struct drm_connector_state *conn_state)
1491{
1492 struct drm_display_mode *mode = &crtc_state->mode;
1493 struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
1494 int diff = mode->htotal - mode->hsync_end;
1495
1496 /*
1497 * ZynqMP DP requires horizontal backporch to be greater than 12.
1498 * This limitation may not be compatible with the sink device.
1499 */
1500 if (diff < ZYNQMP_DP_MIN_H_BACKPORCH) {
1501 int vrefresh = (adjusted_mode->clock * 1000) /
1502 (adjusted_mode->vtotal * adjusted_mode->htotal);
1503
1504 dev_dbg(encoder->dev->dev, "hbackporch adjusted: %d to %d",
1505 diff, ZYNQMP_DP_MIN_H_BACKPORCH - diff);
1506 diff = ZYNQMP_DP_MIN_H_BACKPORCH - diff;
1507 adjusted_mode->htotal += diff;
1508 adjusted_mode->clock = adjusted_mode->vtotal *
1509 adjusted_mode->htotal * vrefresh / 1000;
1510 }
1511
1512 return 0;
1513}
1514
1515static const struct drm_encoder_helper_funcs zynqmp_dp_encoder_helper_funcs = {
1516 .enable = zynqmp_dp_encoder_enable,
1517 .disable = zynqmp_dp_encoder_disable,
1518 .atomic_mode_set = zynqmp_dp_encoder_atomic_mode_set,
1519 .atomic_check = zynqmp_dp_encoder_atomic_check,
1520};
1521
1522/* -----------------------------------------------------------------------------
1523 * Interrupt Handling
1524 */
1525
1526/**
1527 * zynqmp_dp_enable_vblank - Enable vblank
1528 * @dp: DisplayPort IP core structure
1529 *
1530 * Enable vblank interrupt
1531 */
1532void zynqmp_dp_enable_vblank(struct zynqmp_dp *dp)
1533{
1534 zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_VBLANK_START);
1535}
1536
1537/**
1538 * zynqmp_dp_disable_vblank - Disable vblank
1539 * @dp: DisplayPort IP core structure
1540 *
1541 * Disable vblank interrupt
1542 */
1543void zynqmp_dp_disable_vblank(struct zynqmp_dp *dp)
1544{
1545 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_VBLANK_START);
1546}
1547
1548static void zynqmp_dp_hpd_work_func(struct work_struct *work)
1549{
1550 struct zynqmp_dp *dp;
1551
1552 dp = container_of(work, struct zynqmp_dp, hpd_work.work);
1553
1554 if (dp->drm)
1555 drm_helper_hpd_irq_event(dp->drm);
1556}
1557
1558static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
1559{
1560 struct zynqmp_dp *dp = (struct zynqmp_dp *)data;
1561 u32 status, mask;
1562
1563 status = zynqmp_dp_read(dp, ZYNQMP_DP_INT_STATUS);
1564 mask = zynqmp_dp_read(dp, ZYNQMP_DP_INT_MASK);
1565 if (!(status & ~mask))
1566 return IRQ_NONE;
1567
1568 /* dbg for diagnostic, but not much that the driver can do */
1569 if (status & ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK)
1570 dev_dbg_ratelimited(dp->dev, "underflow interrupt\n");
1571 if (status & ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK)
1572 dev_dbg_ratelimited(dp->dev, "overflow interrupt\n");
1573
1574 zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status);
1575
1576 if (status & ZYNQMP_DP_INT_VBLANK_START)
1577 zynqmp_disp_handle_vblank(dp->dpsub->disp);
1578
1579 if (status & ZYNQMP_DP_INT_HPD_EVENT)
1580 schedule_delayed_work(&dp->hpd_work, 0);
1581
1582 if (status & ZYNQMP_DP_INT_HPD_IRQ) {
1583 int ret;
1584 u8 status[DP_LINK_STATUS_SIZE + 2];
1585
1586 ret = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status,
1587 DP_LINK_STATUS_SIZE + 2);
1588 if (ret < 0)
1589 goto handled;
1590
1591 if (status[4] & DP_LINK_STATUS_UPDATED ||
1592 !drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) ||
1593 !drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) {
1594 zynqmp_dp_train_loop(dp);
1595 }
1596 }
1597
1598handled:
1599 return IRQ_HANDLED;
1600}
1601
1602/* -----------------------------------------------------------------------------
1603 * Initialization & Cleanup
1604 */
1605
1606int zynqmp_dp_drm_init(struct zynqmp_dpsub *dpsub)
1607{
1608 struct zynqmp_dp *dp = dpsub->dp;
1609 struct drm_encoder *encoder = &dp->encoder;
1610 struct drm_connector *connector = &dp->connector;
1611 int ret;
1612
1613 dp->config.misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK;
1614 zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8);
1615
1616 /* Create the DRM encoder and connector. */
1617 encoder->possible_crtcs |= zynqmp_disp_get_crtc_mask(dpsub->disp);
1618 drm_simple_encoder_init(dp->drm, encoder, DRM_MODE_ENCODER_TMDS);
1619 drm_encoder_helper_add(encoder, &zynqmp_dp_encoder_helper_funcs);
1620
1621 connector->polled = DRM_CONNECTOR_POLL_HPD;
1622 ret = drm_connector_init(encoder->dev, connector,
1623 &zynqmp_dp_connector_funcs,
1624 DRM_MODE_CONNECTOR_DisplayPort);
1625 if (ret) {
1626 dev_err(dp->dev, "failed to create the DRM connector\n");
1627 return ret;
1628 }
1629
1630 drm_connector_helper_add(connector, &zynqmp_dp_connector_helper_funcs);
1631 drm_connector_register(connector);
1632 drm_connector_attach_encoder(connector, encoder);
1633
1634 /* Initialize and register the AUX adapter. */
1635 ret = zynqmp_dp_aux_init(dp);
1636 if (ret) {
1637 dev_err(dp->dev, "failed to initialize DP aux\n");
1638 return ret;
1639 }
1640
1641 /* Now that initialisation is complete, enable interrupts. */
1642 zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_ALL);
1643
1644 return 0;
1645}
1646
1647int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub, struct drm_device *drm)
1648{
1649 struct platform_device *pdev = to_platform_device(dpsub->dev);
1650 struct zynqmp_dp *dp;
1651 struct resource *res;
1652 int ret;
1653
1654 dp = drmm_kzalloc(drm, sizeof(*dp), GFP_KERNEL);
1655 if (!dp)
1656 return -ENOMEM;
1657
1658 dp->dev = &pdev->dev;
1659 dp->dpsub = dpsub;
1660 dp->status = connector_status_disconnected;
1661 dp->drm = drm;
1662
1663 INIT_DELAYED_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func);
1664
1665 dpsub->dp = dp;
1666
1667 /* Acquire all resources (IOMEM, IRQ and PHYs). */
1668 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dp");
1669 dp->iomem = devm_ioremap_resource(dp->dev, res);
1670 if (IS_ERR(dp->iomem))
1671 return PTR_ERR(dp->iomem);
1672
1673 dp->irq = platform_get_irq(pdev, 0);
1674 if (dp->irq < 0)
1675 return dp->irq;
1676
1677 dp->reset = devm_reset_control_get(dp->dev, NULL);
1678 if (IS_ERR(dp->reset)) {
1679 if (PTR_ERR(dp->reset) != -EPROBE_DEFER)
1680 dev_err(dp->dev, "failed to get reset: %ld\n",
1681 PTR_ERR(dp->reset));
1682 return PTR_ERR(dp->reset);
1683 }
1684
1685 ret = zynqmp_dp_phy_probe(dp);
1686 if (ret)
1687 return ret;
1688
1689 /* Initialize the hardware. */
1690 zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN,
1691 ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL);
1692 zynqmp_dp_set(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET);
1693 zynqmp_dp_write(dp, ZYNQMP_DP_FORCE_SCRAMBLER_RESET, 1);
1694 zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0);
1695 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff);
1696
1697 ret = zynqmp_dp_phy_init(dp);
1698 if (ret)
1699 return ret;
1700
1701 zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 1);
1702
1703 /*
1704 * Now that the hardware is initialized and won't generate spurious
1705 * interrupts, request the IRQ.
1706 */
1707 ret = devm_request_threaded_irq(dp->dev, dp->irq, NULL,
1708 zynqmp_dp_irq_handler, IRQF_ONESHOT,
1709 dev_name(dp->dev), dp);
1710 if (ret < 0)
1711 goto error;
1712
1713 dev_dbg(dp->dev, "ZynqMP DisplayPort Tx probed with %u lanes\n",
1714 dp->num_lanes);
1715
1716 return 0;
1717
1718error:
1719 zynqmp_dp_phy_exit(dp);
1720 return ret;
1721}
1722
1723void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub)
1724{
1725 struct zynqmp_dp *dp = dpsub->dp;
1726
1727 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_ALL);
1728 disable_irq(dp->irq);
1729
1730 cancel_delayed_work_sync(&dp->hpd_work);
1731 zynqmp_dp_aux_cleanup(dp);
1732
1733 zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0);
1734 zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff);
1735
1736 zynqmp_dp_phy_exit(dp);
1737}