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Marek Vasutf2e4d6a2014-12-16 14:09:22 +01001/*
2 * Novena video output support
3 *
Marek Vasut331ae842014-12-16 14:09:23 +01004 * IT6251 code based on code Copyright (C) 2014 Sean Cross
5 * from https://github.com/xobs/novena-linux.git commit
6 * 3d85836ee1377d445531928361809612aa0a18db
7 *
Marek Vasutf2e4d6a2014-12-16 14:09:22 +01008 * Copyright (C) 2014 Marek Vasut <marex@denx.de>
9 *
10 * SPDX-License-Identifier: GPL-2.0+
11 */
12
13#include <common.h>
14#include <asm/errno.h>
15#include <asm/gpio.h>
16#include <asm/io.h>
17#include <asm/arch/clock.h>
18#include <asm/arch/crm_regs.h>
19#include <asm/arch/imx-regs.h>
20#include <asm/arch/iomux.h>
21#include <asm/arch/mxc_hdmi.h>
22#include <asm/arch/sys_proto.h>
23#include <asm/imx-common/iomux-v3.h>
24#include <asm/imx-common/mxc_i2c.h>
25#include <asm/imx-common/video.h>
26#include <i2c.h>
27#include <input.h>
28#include <ipu_pixfmt.h>
29#include <linux/fb.h>
30#include <linux/input.h>
31#include <malloc.h>
32#include <stdio_dev.h>
33
34#include "novena.h"
35
Marek Vasut331ae842014-12-16 14:09:23 +010036#define IT6251_VENDOR_ID_LOW 0x00
37#define IT6251_VENDOR_ID_HIGH 0x01
38#define IT6251_DEVICE_ID_LOW 0x02
39#define IT6251_DEVICE_ID_HIGH 0x03
40#define IT6251_SYSTEM_STATUS 0x0d
41#define IT6251_SYSTEM_STATUS_RINTSTATUS (1 << 0)
42#define IT6251_SYSTEM_STATUS_RHPDSTATUS (1 << 1)
43#define IT6251_SYSTEM_STATUS_RVIDEOSTABLE (1 << 2)
44#define IT6251_SYSTEM_STATUS_RPLL_IOLOCK (1 << 3)
45#define IT6251_SYSTEM_STATUS_RPLL_XPLOCK (1 << 4)
46#define IT6251_SYSTEM_STATUS_RPLL_SPLOCK (1 << 5)
47#define IT6251_SYSTEM_STATUS_RAUXFREQ_LOCK (1 << 6)
48#define IT6251_REF_STATE 0x0e
49#define IT6251_REF_STATE_MAIN_LINK_DISABLED (1 << 0)
50#define IT6251_REF_STATE_AUX_CHANNEL_READ (1 << 1)
51#define IT6251_REF_STATE_CR_PATTERN (1 << 2)
52#define IT6251_REF_STATE_EQ_PATTERN (1 << 3)
53#define IT6251_REF_STATE_NORMAL_OPERATION (1 << 4)
54#define IT6251_REF_STATE_MUTED (1 << 5)
55
56#define IT6251_REG_PCLK_CNT_LOW 0x57
57#define IT6251_REG_PCLK_CNT_HIGH 0x58
58
59#define IT6521_RETRY_MAX 20
60
61static int it6251_is_stable(void)
62{
63 const unsigned int caddr = NOVENA_IT6251_CHIPADDR;
64 const unsigned int laddr = NOVENA_IT6251_LVDSADDR;
65 int status;
66 int clkcnt;
67 int rpclkcnt;
68 int refstate;
69
70 rpclkcnt = (i2c_reg_read(caddr, 0x13) & 0xff) |
71 ((i2c_reg_read(caddr, 0x14) << 8) & 0x0f00);
72 debug("RPCLKCnt: %d\n", rpclkcnt);
73
74 status = i2c_reg_read(caddr, IT6251_SYSTEM_STATUS);
75 debug("System status: 0x%02x\n", status);
76
77 clkcnt = (i2c_reg_read(laddr, IT6251_REG_PCLK_CNT_LOW) & 0xff) |
78 ((i2c_reg_read(laddr, IT6251_REG_PCLK_CNT_HIGH) << 8) &
79 0x0f00);
80 debug("Clock: 0x%02x\n", clkcnt);
81
82 refstate = i2c_reg_read(laddr, IT6251_REF_STATE);
83 debug("Ref Link State: 0x%02x\n", refstate);
84
85 if ((refstate & 0x1f) != 0)
86 return 0;
87
88 /* If video is muted, that's a failure */
89 if (refstate & IT6251_REF_STATE_MUTED)
90 return 0;
91
92 if (!(status & IT6251_SYSTEM_STATUS_RVIDEOSTABLE))
93 return 0;
94
95 return 1;
96}
97
98static int it6251_ready(void)
99{
100 const unsigned int caddr = NOVENA_IT6251_CHIPADDR;
101
102 /* Test if the IT6251 came out of reset by reading ID regs. */
103 if (i2c_reg_read(caddr, IT6251_VENDOR_ID_LOW) != 0x15)
104 return 0;
105 if (i2c_reg_read(caddr, IT6251_VENDOR_ID_HIGH) != 0xca)
106 return 0;
107 if (i2c_reg_read(caddr, IT6251_DEVICE_ID_LOW) != 0x51)
108 return 0;
109 if (i2c_reg_read(caddr, IT6251_DEVICE_ID_HIGH) != 0x62)
110 return 0;
111
112 return 1;
113}
114
115static void it6251_program_regs(void)
116{
117 const unsigned int caddr = NOVENA_IT6251_CHIPADDR;
118 const unsigned int laddr = NOVENA_IT6251_LVDSADDR;
119
120 i2c_reg_write(caddr, 0x05, 0x00);
121 mdelay(1);
122
123 /* set LVDSRX address, and enable */
124 i2c_reg_write(caddr, 0xfd, 0xbc);
125 i2c_reg_write(caddr, 0xfe, 0x01);
126
127 /*
128 * LVDSRX
129 */
130 /* This write always fails, because the chip goes into reset */
131 /* reset LVDSRX */
132 i2c_reg_write(laddr, 0x05, 0xff);
133 i2c_reg_write(laddr, 0x05, 0x00);
134
135 /* reset LVDSRX PLL */
136 i2c_reg_write(laddr, 0x3b, 0x42);
137 i2c_reg_write(laddr, 0x3b, 0x43);
138
139 /* something with SSC PLL */
140 i2c_reg_write(laddr, 0x3c, 0x08);
141 /* don't swap links, but writing reserved registers */
142 i2c_reg_write(laddr, 0x0b, 0x88);
143
144 /* JEIDA, 8-bit depth 0x11, orig 0x42 */
145 i2c_reg_write(laddr, 0x2c, 0x01);
146 /* "reserved" */
147 i2c_reg_write(laddr, 0x32, 0x04);
148 /* "reserved" */
149 i2c_reg_write(laddr, 0x35, 0xe0);
150 /* "reserved" + clock delay */
151 i2c_reg_write(laddr, 0x2b, 0x24);
152
153 /* reset LVDSRX pix clock */
154 i2c_reg_write(laddr, 0x05, 0x02);
155 i2c_reg_write(laddr, 0x05, 0x00);
156
157 /*
158 * DPTX
159 */
160 /* set for two lane mode, normal op, no swapping, no downspread */
161 i2c_reg_write(caddr, 0x16, 0x02);
162
163 /* some AUX channel EDID magic */
164 i2c_reg_write(caddr, 0x23, 0x40);
165
166 /* power down lanes 3-0 */
167 i2c_reg_write(caddr, 0x5c, 0xf3);
168
169 /* enable DP scrambling, change EQ CR phase */
170 i2c_reg_write(caddr, 0x5f, 0x06);
171
172 /* color mode RGB, pclk/2 */
173 i2c_reg_write(caddr, 0x60, 0x02);
174 /* dual pixel input mode, no EO swap, no RGB swap */
175 i2c_reg_write(caddr, 0x61, 0x04);
176 /* M444B24 video format */
177 i2c_reg_write(caddr, 0x62, 0x01);
178
179 /* vesa range / not interlace / vsync high / hsync high */
180 i2c_reg_write(caddr, 0xa0, 0x0F);
181
182 /* hpd event timer set to 1.6-ish ms */
183 i2c_reg_write(caddr, 0xc9, 0xf5);
184
185 /* more reserved magic */
186 i2c_reg_write(caddr, 0xca, 0x4d);
187 i2c_reg_write(caddr, 0xcb, 0x37);
188
189 /* enhanced framing mode, auto video fifo reset, video mute disable */
190 i2c_reg_write(caddr, 0xd3, 0x03);
191
192 /* "vidstmp" and some reserved stuff */
193 i2c_reg_write(caddr, 0xd4, 0x45);
194
195 /* queue number -- reserved */
196 i2c_reg_write(caddr, 0xe7, 0xa0);
197 /* info frame packets and reserved */
198 i2c_reg_write(caddr, 0xe8, 0x33);
199 /* more AVI stuff */
200 i2c_reg_write(caddr, 0xec, 0x00);
201
202 /* select PC master reg for aux channel? */
203 i2c_reg_write(caddr, 0x23, 0x42);
204
205 /* send PC request commands */
206 i2c_reg_write(caddr, 0x24, 0x00);
207 i2c_reg_write(caddr, 0x25, 0x00);
208 i2c_reg_write(caddr, 0x26, 0x00);
209
210 /* native aux read */
211 i2c_reg_write(caddr, 0x2b, 0x00);
212 /* back to internal */
213 i2c_reg_write(caddr, 0x23, 0x40);
214
215 /* voltage swing level 3 */
216 i2c_reg_write(caddr, 0x19, 0xff);
217 /* pre-emphasis level 3 */
218 i2c_reg_write(caddr, 0x1a, 0xff);
219
220 /* start link training */
221 i2c_reg_write(caddr, 0x17, 0x01);
222}
223
224static int it6251_init(void)
225{
226 const unsigned int caddr = NOVENA_IT6251_CHIPADDR;
227 int reg;
228 int tries, retries = 0;
229
230 for (retries = 0; retries < IT6521_RETRY_MAX; retries++) {
231 /* Program the chip. */
232 it6251_program_regs();
233
234 /* Wait for video stable. */
235 for (tries = 0; tries < 100; tries++) {
236 reg = i2c_reg_read(caddr, 0x17);
237 /* Test Link CFG, STS, LCS read done. */
238 if ((reg & 0xe0) != 0xe0) {
239 /* Not yet, wait a bit more. */
240 mdelay(2);
241 continue;
242 }
243
244 /* Test if the video input is stable. */
245 if (it6251_is_stable())
246 return 0;
247 }
248 /*
249 * If we couldn't stabilize, requeue and try again,
250 * because it means that the LVDS channel isn't
251 * stable yet.
252 */
253 printf("Display didn't stabilize.\n");
254 printf("This may be because the LVDS port is still in powersave mode.\n");
255 mdelay(50);
256 }
257
258 return -EINVAL;
259}
260
Marek Vasutf2e4d6a2014-12-16 14:09:22 +0100261static void enable_hdmi(struct display_info_t const *dev)
262{
263 imx_enable_hdmi_phy();
264}
265
Marek Vasut331ae842014-12-16 14:09:23 +0100266static int lvds_enabled;
267
268static void enable_lvds(struct display_info_t const *dev)
269{
270 if (lvds_enabled)
271 return;
272
273 /* ITE IT6251 power enable. */
274 gpio_direction_output(NOVENA_ITE6251_PWR_GPIO, 0);
275 mdelay(10);
276 gpio_direction_output(NOVENA_ITE6251_PWR_GPIO, 1);
277 mdelay(20);
278 lvds_enabled = 1;
279}
280
281static int detect_lvds(struct display_info_t const *dev)
282{
283 int ret, loops = 250;
284
285 enable_lvds(dev);
286
287 ret = i2c_set_bus_num(NOVENA_IT6251_I2C_BUS);
288 if (ret) {
289 puts("Cannot select IT6251 I2C bus.\n");
290 return 0;
291 }
292
293 /* Wait up-to ~250 mS for the LVDS to come up. */
294 while (--loops) {
295 ret = it6251_ready();
296 if (ret)
297 return ret;
298
299 mdelay(1);
300 }
301
302 return 0;
303}
304
Marek Vasutf2e4d6a2014-12-16 14:09:22 +0100305struct display_info_t const displays[] = {
306 {
307 /* HDMI Output */
308 .bus = -1,
309 .addr = 0,
310 .pixfmt = IPU_PIX_FMT_RGB24,
311 .detect = detect_hdmi,
312 .enable = enable_hdmi,
313 .mode = {
314 .name = "HDMI",
315 .refresh = 60,
316 .xres = 1024,
317 .yres = 768,
318 .pixclock = 15384,
319 .left_margin = 220,
320 .right_margin = 40,
321 .upper_margin = 21,
322 .lower_margin = 7,
323 .hsync_len = 60,
324 .vsync_len = 10,
325 .sync = FB_SYNC_EXT,
326 .vmode = FB_VMODE_NONINTERLACED
327 },
Marek Vasut331ae842014-12-16 14:09:23 +0100328 }, {
329 /* LVDS Output: N133HSE-EA1 Rev. C1 */
330 .bus = -1,
331 .pixfmt = IPU_PIX_FMT_RGB24,
332 .detect = detect_lvds,
333 .enable = enable_lvds,
334 .mode = {
335 .name = "Chimei-FHD",
336 .refresh = 60,
337 .xres = 1920,
338 .yres = 1080,
339 .pixclock = 15384,
340 .left_margin = 148,
341 .right_margin = 88,
342 .upper_margin = 36,
343 .lower_margin = 4,
344 .hsync_len = 44,
345 .vsync_len = 5,
346 .sync = FB_SYNC_HOR_HIGH_ACT |
347 FB_SYNC_VERT_HIGH_ACT |
348 FB_SYNC_EXT,
349 .vmode = FB_VMODE_NONINTERLACED,
350 },
Marek Vasutf2e4d6a2014-12-16 14:09:22 +0100351 },
352};
353
354size_t display_count = ARRAY_SIZE(displays);
355
Marek Vasut331ae842014-12-16 14:09:23 +0100356static void enable_vpll(void)
357{
358 struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
359 int timeout = 100000;
360
361 setbits_le32(&ccm->analog_pll_video, BM_ANADIG_PLL_VIDEO_POWERDOWN);
362
363 clrsetbits_le32(&ccm->analog_pll_video,
364 BM_ANADIG_PLL_VIDEO_DIV_SELECT |
365 BM_ANADIG_PLL_VIDEO_POST_DIV_SELECT,
366 BF_ANADIG_PLL_VIDEO_DIV_SELECT(37) |
367 BF_ANADIG_PLL_VIDEO_POST_DIV_SELECT(1));
368
369 writel(BF_ANADIG_PLL_VIDEO_NUM_A(11), &ccm->analog_pll_video_num);
370 writel(BF_ANADIG_PLL_VIDEO_DENOM_B(12), &ccm->analog_pll_video_denom);
371
372 clrbits_le32(&ccm->analog_pll_video, BM_ANADIG_PLL_VIDEO_POWERDOWN);
373
374 while (timeout--)
375 if (readl(&ccm->analog_pll_video) & BM_ANADIG_PLL_VIDEO_LOCK)
376 break;
377 if (timeout < 0)
378 printf("Warning: video pll lock timeout!\n");
379
380 clrsetbits_le32(&ccm->analog_pll_video,
381 BM_ANADIG_PLL_VIDEO_BYPASS,
382 BM_ANADIG_PLL_VIDEO_ENABLE);
383}
384
Marek Vasutf2e4d6a2014-12-16 14:09:22 +0100385void setup_display_clock(void)
386{
387 struct mxc_ccm_reg *mxc_ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
388 struct iomuxc *iomux = (struct iomuxc *)IOMUXC_BASE_ADDR;
389
390 enable_ipu_clock();
Marek Vasut331ae842014-12-16 14:09:23 +0100391 enable_vpll();
Marek Vasutf2e4d6a2014-12-16 14:09:22 +0100392 imx_setup_hdmi();
393
Marek Vasut331ae842014-12-16 14:09:23 +0100394 /* Turn on IPU LDB DI0 clocks */
Marek Vasutf2e4d6a2014-12-16 14:09:22 +0100395 setbits_le32(&mxc_ccm->CCGR3, MXC_CCM_CCGR3_LDB_DI0_MASK);
396
Marek Vasut331ae842014-12-16 14:09:23 +0100397 /* Switch LDB DI0 to PLL5 (Video PLL) */
Marek Vasutf2e4d6a2014-12-16 14:09:22 +0100398 clrsetbits_le32(&mxc_ccm->cs2cdr,
Marek Vasut331ae842014-12-16 14:09:23 +0100399 MXC_CCM_CS2CDR_LDB_DI0_CLK_SEL_MASK,
400 (0 << MXC_CCM_CS2CDR_LDB_DI0_CLK_SEL_OFFSET));
Marek Vasutf2e4d6a2014-12-16 14:09:22 +0100401
Marek Vasut331ae842014-12-16 14:09:23 +0100402 /* LDB clock div by 3.5 */
403 clrbits_le32(&mxc_ccm->cscmr2, MXC_CCM_CSCMR2_LDB_DI0_IPU_DIV);
Marek Vasutf2e4d6a2014-12-16 14:09:22 +0100404
Marek Vasut331ae842014-12-16 14:09:23 +0100405 /* DI0 clock derived from ldb_di0_clk */
406 clrsetbits_le32(&mxc_ccm->chsccdr,
407 MXC_CCM_CHSCCDR_IPU1_DI0_CLK_SEL_MASK,
408 (CHSCCDR_CLK_SEL_LDB_DI0 <<
409 MXC_CCM_CHSCCDR_IPU1_DI0_CLK_SEL_OFFSET)
410 );
Marek Vasutf2e4d6a2014-12-16 14:09:22 +0100411
Marek Vasut331ae842014-12-16 14:09:23 +0100412 /* Enable both LVDS channels, both connected to DI0. */
413 writel(IOMUXC_GPR2_DI0_VS_POLARITY_ACTIVE_HIGH |
414 IOMUXC_GPR2_BIT_MAPPING_CH1_JEIDA |
415 IOMUXC_GPR2_DATA_WIDTH_CH1_24BIT |
416 IOMUXC_GPR2_BIT_MAPPING_CH0_JEIDA |
417 IOMUXC_GPR2_DATA_WIDTH_CH0_24BIT |
418 IOMUXC_GPR2_SPLIT_MODE_EN_MASK |
419 IOMUXC_GPR2_LVDS_CH1_MODE_ENABLED_DI0 |
Marek Vasutf2e4d6a2014-12-16 14:09:22 +0100420 IOMUXC_GPR2_LVDS_CH0_MODE_ENABLED_DI0,
421 &iomux->gpr[2]);
422
Marek Vasut331ae842014-12-16 14:09:23 +0100423 clrsetbits_le32(&iomux->gpr[3],
424 IOMUXC_GPR3_LVDS0_MUX_CTL_MASK |
425 IOMUXC_GPR3_LVDS1_MUX_CTL_MASK,
426 (IOMUXC_GPR3_MUX_SRC_IPU1_DI0 <<
427 IOMUXC_GPR3_LVDS0_MUX_CTL_OFFSET) |
428 (IOMUXC_GPR3_MUX_SRC_IPU1_DI0 <<
429 IOMUXC_GPR3_LVDS1_MUX_CTL_OFFSET)
430 );
431}
432
433void setup_display_lvds(void)
434{
435 int ret;
436
437 ret = i2c_set_bus_num(NOVENA_IT6251_I2C_BUS);
438 if (ret) {
439 puts("Cannot select LVDS-to-eDP I2C bus.\n");
440 return;
441 }
442
443 /* The IT6251 should be ready now, if it's not, it's not connected. */
444 ret = it6251_ready();
445 if (!ret)
446 return;
447
448 /* Init the LVDS-to-eDP chip and if it succeeded, enable backlight. */
449 ret = it6251_init();
450 if (!ret) {
451 /* Backlight power enable. */
452 gpio_direction_output(NOVENA_BACKLIGHT_PWR_GPIO, 1);
453 /* PWM backlight pin, always on for full brightness. */
454 gpio_direction_output(NOVENA_BACKLIGHT_PWM_GPIO, 1);
455 }
Marek Vasutf2e4d6a2014-12-16 14:09:22 +0100456}