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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Copyright (c) 2018, The Linux Foundation. All rights reserved.
0004  * Copyright (c) 2019-2020. Linaro Limited.
0005  */
0006 
0007 #include <linux/gpio/consumer.h>
0008 #include <linux/i2c.h>
0009 #include <linux/interrupt.h>
0010 #include <linux/media-bus-format.h>
0011 #include <linux/module.h>
0012 #include <linux/of_graph.h>
0013 #include <linux/platform_device.h>
0014 #include <linux/regmap.h>
0015 #include <linux/regulator/consumer.h>
0016 
0017 #include <sound/hdmi-codec.h>
0018 
0019 #include <drm/drm_atomic_helper.h>
0020 #include <drm/drm_bridge.h>
0021 #include <drm/drm_mipi_dsi.h>
0022 #include <drm/drm_print.h>
0023 #include <drm/drm_probe_helper.h>
0024 
0025 #define EDID_SEG_SIZE   256
0026 #define EDID_LEN    32
0027 #define EDID_LOOP   8
0028 #define KEY_DDC_ACCS_DONE 0x02
0029 #define DDC_NO_ACK  0x50
0030 
0031 #define LT9611_4LANES   0
0032 
0033 struct lt9611 {
0034     struct device *dev;
0035     struct drm_bridge bridge;
0036     struct drm_connector connector;
0037 
0038     struct regmap *regmap;
0039 
0040     struct device_node *dsi0_node;
0041     struct device_node *dsi1_node;
0042     struct mipi_dsi_device *dsi0;
0043     struct mipi_dsi_device *dsi1;
0044     struct platform_device *audio_pdev;
0045 
0046     bool ac_mode;
0047 
0048     struct gpio_desc *reset_gpio;
0049     struct gpio_desc *enable_gpio;
0050 
0051     bool power_on;
0052     bool sleep;
0053 
0054     struct regulator_bulk_data supplies[2];
0055 
0056     struct i2c_client *client;
0057 
0058     enum drm_connector_status status;
0059 
0060     u8 edid_buf[EDID_SEG_SIZE];
0061     u32 vic;
0062 };
0063 
0064 #define LT9611_PAGE_CONTROL 0xff
0065 
0066 static const struct regmap_range_cfg lt9611_ranges[] = {
0067     {
0068         .name = "register_range",
0069         .range_min =  0,
0070         .range_max = 0x85ff,
0071         .selector_reg = LT9611_PAGE_CONTROL,
0072         .selector_mask = 0xff,
0073         .selector_shift = 0,
0074         .window_start = 0,
0075         .window_len = 0x100,
0076     },
0077 };
0078 
0079 static const struct regmap_config lt9611_regmap_config = {
0080     .reg_bits = 8,
0081     .val_bits = 8,
0082     .max_register = 0xffff,
0083     .ranges = lt9611_ranges,
0084     .num_ranges = ARRAY_SIZE(lt9611_ranges),
0085 };
0086 
0087 struct lt9611_mode {
0088     u16 hdisplay;
0089     u16 vdisplay;
0090     u8 vrefresh;
0091     u8 lanes;
0092     u8 intfs;
0093 };
0094 
0095 static struct lt9611_mode lt9611_modes[] = {
0096     { 3840, 2160, 30, 4, 2 }, /* 3840x2160 24bit 30Hz 4Lane 2ports */
0097     { 1920, 1080, 60, 4, 1 }, /* 1080P 24bit 60Hz 4lane 1port */
0098     { 1920, 1080, 30, 3, 1 }, /* 1080P 24bit 30Hz 3lane 1port */
0099     { 1920, 1080, 24, 3, 1 },
0100     { 720, 480, 60, 4, 1 },
0101     { 720, 576, 50, 2, 1 },
0102     { 640, 480, 60, 2, 1 },
0103 };
0104 
0105 static struct lt9611 *bridge_to_lt9611(struct drm_bridge *bridge)
0106 {
0107     return container_of(bridge, struct lt9611, bridge);
0108 }
0109 
0110 static struct lt9611 *connector_to_lt9611(struct drm_connector *connector)
0111 {
0112     return container_of(connector, struct lt9611, connector);
0113 }
0114 
0115 static int lt9611_mipi_input_analog(struct lt9611 *lt9611)
0116 {
0117     const struct reg_sequence reg_cfg[] = {
0118         { 0x8106, 0x40 }, /* port A rx current */
0119         { 0x810a, 0xfe }, /* port A ldo voltage set */
0120         { 0x810b, 0xbf }, /* enable port A lprx */
0121         { 0x8111, 0x40 }, /* port B rx current */
0122         { 0x8115, 0xfe }, /* port B ldo voltage set */
0123         { 0x8116, 0xbf }, /* enable port B lprx */
0124 
0125         { 0x811c, 0x03 }, /* PortA clk lane no-LP mode */
0126         { 0x8120, 0x03 }, /* PortB clk lane with-LP mode */
0127     };
0128 
0129     return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
0130 }
0131 
0132 static int lt9611_mipi_input_digital(struct lt9611 *lt9611,
0133                      const struct drm_display_mode *mode)
0134 {
0135     struct reg_sequence reg_cfg[] = {
0136         { 0x8300, LT9611_4LANES },
0137         { 0x830a, 0x00 },
0138         { 0x824f, 0x80 },
0139         { 0x8250, 0x10 },
0140         { 0x8302, 0x0a },
0141         { 0x8306, 0x0a },
0142     };
0143 
0144     if (mode->hdisplay == 3840)
0145         reg_cfg[1].def = 0x03;
0146 
0147     return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
0148 }
0149 
0150 static void lt9611_mipi_video_setup(struct lt9611 *lt9611,
0151                     const struct drm_display_mode *mode)
0152 {
0153     u32 h_total, hactive, hsync_len, hfront_porch, hsync_porch;
0154     u32 v_total, vactive, vsync_len, vfront_porch, vsync_porch;
0155 
0156     h_total = mode->htotal;
0157     v_total = mode->vtotal;
0158 
0159     hactive = mode->hdisplay;
0160     hsync_len = mode->hsync_end - mode->hsync_start;
0161     hfront_porch = mode->hsync_start - mode->hdisplay;
0162     hsync_porch = hsync_len + mode->htotal - mode->hsync_end;
0163 
0164     vactive = mode->vdisplay;
0165     vsync_len = mode->vsync_end - mode->vsync_start;
0166     vfront_porch = mode->vsync_start - mode->vdisplay;
0167     vsync_porch = vsync_len + mode->vtotal - mode->vsync_end;
0168 
0169     regmap_write(lt9611->regmap, 0x830d, (u8)(v_total / 256));
0170     regmap_write(lt9611->regmap, 0x830e, (u8)(v_total % 256));
0171 
0172     regmap_write(lt9611->regmap, 0x830f, (u8)(vactive / 256));
0173     regmap_write(lt9611->regmap, 0x8310, (u8)(vactive % 256));
0174 
0175     regmap_write(lt9611->regmap, 0x8311, (u8)(h_total / 256));
0176     regmap_write(lt9611->regmap, 0x8312, (u8)(h_total % 256));
0177 
0178     regmap_write(lt9611->regmap, 0x8313, (u8)(hactive / 256));
0179     regmap_write(lt9611->regmap, 0x8314, (u8)(hactive % 256));
0180 
0181     regmap_write(lt9611->regmap, 0x8315, (u8)(vsync_len % 256));
0182     regmap_write(lt9611->regmap, 0x8316, (u8)(hsync_len % 256));
0183 
0184     regmap_write(lt9611->regmap, 0x8317, (u8)(vfront_porch % 256));
0185 
0186     regmap_write(lt9611->regmap, 0x8318, (u8)(vsync_porch % 256));
0187 
0188     regmap_write(lt9611->regmap, 0x8319, (u8)(hfront_porch % 256));
0189 
0190     regmap_write(lt9611->regmap, 0x831a, (u8)(hsync_porch / 256));
0191     regmap_write(lt9611->regmap, 0x831b, (u8)(hsync_porch % 256));
0192 }
0193 
0194 static void lt9611_pcr_setup(struct lt9611 *lt9611, const struct drm_display_mode *mode)
0195 {
0196     const struct reg_sequence reg_cfg[] = {
0197         { 0x830b, 0x01 },
0198         { 0x830c, 0x10 },
0199         { 0x8348, 0x00 },
0200         { 0x8349, 0x81 },
0201 
0202         /* stage 1 */
0203         { 0x8321, 0x4a },
0204         { 0x8324, 0x71 },
0205         { 0x8325, 0x30 },
0206         { 0x832a, 0x01 },
0207 
0208         /* stage 2 */
0209         { 0x834a, 0x40 },
0210         { 0x831d, 0x10 },
0211 
0212         /* MK limit */
0213         { 0x832d, 0x38 },
0214         { 0x8331, 0x08 },
0215     };
0216     const struct reg_sequence reg_cfg2[] = {
0217         { 0x830b, 0x03 },
0218         { 0x830c, 0xd0 },
0219         { 0x8348, 0x03 },
0220         { 0x8349, 0xe0 },
0221         { 0x8324, 0x72 },
0222         { 0x8325, 0x00 },
0223         { 0x832a, 0x01 },
0224         { 0x834a, 0x10 },
0225         { 0x831d, 0x10 },
0226         { 0x8326, 0x37 },
0227     };
0228 
0229     regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
0230 
0231     switch (mode->hdisplay) {
0232     case 640:
0233         regmap_write(lt9611->regmap, 0x8326, 0x14);
0234         break;
0235     case 1920:
0236         regmap_write(lt9611->regmap, 0x8326, 0x37);
0237         break;
0238     case 3840:
0239         regmap_multi_reg_write(lt9611->regmap, reg_cfg2, ARRAY_SIZE(reg_cfg2));
0240         break;
0241     }
0242 
0243     /* pcr rst */
0244     regmap_write(lt9611->regmap, 0x8011, 0x5a);
0245     regmap_write(lt9611->regmap, 0x8011, 0xfa);
0246 }
0247 
0248 static int lt9611_pll_setup(struct lt9611 *lt9611, const struct drm_display_mode *mode)
0249 {
0250     unsigned int pclk = mode->clock;
0251     const struct reg_sequence reg_cfg[] = {
0252         /* txpll init */
0253         { 0x8123, 0x40 },
0254         { 0x8124, 0x64 },
0255         { 0x8125, 0x80 },
0256         { 0x8126, 0x55 },
0257         { 0x812c, 0x37 },
0258         { 0x812f, 0x01 },
0259         { 0x8126, 0x55 },
0260         { 0x8127, 0x66 },
0261         { 0x8128, 0x88 },
0262     };
0263 
0264     regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
0265 
0266     if (pclk > 150000)
0267         regmap_write(lt9611->regmap, 0x812d, 0x88);
0268     else if (pclk > 70000)
0269         regmap_write(lt9611->regmap, 0x812d, 0x99);
0270     else
0271         regmap_write(lt9611->regmap, 0x812d, 0xaa);
0272 
0273     /*
0274      * first divide pclk by 2 first
0275      *  - write divide by 64k to 19:16 bits which means shift by 17
0276      *  - write divide by 256 to 15:8 bits which means shift by 9
0277      *  - write remainder to 7:0 bits, which means shift by 1
0278      */
0279     regmap_write(lt9611->regmap, 0x82e3, pclk >> 17); /* pclk[19:16] */
0280     regmap_write(lt9611->regmap, 0x82e4, pclk >> 9);  /* pclk[15:8]  */
0281     regmap_write(lt9611->regmap, 0x82e5, pclk >> 1);  /* pclk[7:0]   */
0282 
0283     regmap_write(lt9611->regmap, 0x82de, 0x20);
0284     regmap_write(lt9611->regmap, 0x82de, 0xe0);
0285 
0286     regmap_write(lt9611->regmap, 0x8016, 0xf1);
0287     regmap_write(lt9611->regmap, 0x8016, 0xf3);
0288 
0289     return 0;
0290 }
0291 
0292 static int lt9611_read_video_check(struct lt9611 *lt9611, unsigned int reg)
0293 {
0294     unsigned int temp, temp2;
0295     int ret;
0296 
0297     ret = regmap_read(lt9611->regmap, reg, &temp);
0298     if (ret)
0299         return ret;
0300     temp <<= 8;
0301     ret = regmap_read(lt9611->regmap, reg + 1, &temp2);
0302     if (ret)
0303         return ret;
0304 
0305     return (temp + temp2);
0306 }
0307 
0308 static int lt9611_video_check(struct lt9611 *lt9611)
0309 {
0310     u32 v_total, vactive, hactive_a, hactive_b, h_total_sysclk;
0311     int temp;
0312 
0313     /* top module video check */
0314 
0315     /* vactive */
0316     temp = lt9611_read_video_check(lt9611, 0x8282);
0317     if (temp < 0)
0318         goto end;
0319     vactive = temp;
0320 
0321     /* v_total */
0322     temp = lt9611_read_video_check(lt9611, 0x826c);
0323     if (temp < 0)
0324         goto end;
0325     v_total = temp;
0326 
0327     /* h_total_sysclk */
0328     temp = lt9611_read_video_check(lt9611, 0x8286);
0329     if (temp < 0)
0330         goto end;
0331     h_total_sysclk = temp;
0332 
0333     /* hactive_a */
0334     temp = lt9611_read_video_check(lt9611, 0x8382);
0335     if (temp < 0)
0336         goto end;
0337     hactive_a = temp / 3;
0338 
0339     /* hactive_b */
0340     temp = lt9611_read_video_check(lt9611, 0x8386);
0341     if (temp < 0)
0342         goto end;
0343     hactive_b = temp / 3;
0344 
0345     dev_info(lt9611->dev,
0346          "video check: hactive_a=%d, hactive_b=%d, vactive=%d, v_total=%d, h_total_sysclk=%d\n",
0347          hactive_a, hactive_b, vactive, v_total, h_total_sysclk);
0348 
0349     return 0;
0350 
0351 end:
0352     dev_err(lt9611->dev, "read video check error\n");
0353     return temp;
0354 }
0355 
0356 static void lt9611_hdmi_tx_digital(struct lt9611 *lt9611)
0357 {
0358     regmap_write(lt9611->regmap, 0x8443, 0x46 - lt9611->vic);
0359     regmap_write(lt9611->regmap, 0x8447, lt9611->vic);
0360     regmap_write(lt9611->regmap, 0x843d, 0x0a); /* UD1 infoframe */
0361 
0362     regmap_write(lt9611->regmap, 0x82d6, 0x8c);
0363     regmap_write(lt9611->regmap, 0x82d7, 0x04);
0364 }
0365 
0366 static void lt9611_hdmi_tx_phy(struct lt9611 *lt9611)
0367 {
0368     struct reg_sequence reg_cfg[] = {
0369         { 0x8130, 0x6a },
0370         { 0x8131, 0x44 }, /* HDMI DC mode */
0371         { 0x8132, 0x4a },
0372         { 0x8133, 0x0b },
0373         { 0x8134, 0x00 },
0374         { 0x8135, 0x00 },
0375         { 0x8136, 0x00 },
0376         { 0x8137, 0x44 },
0377         { 0x813f, 0x0f },
0378         { 0x8140, 0xa0 },
0379         { 0x8141, 0xa0 },
0380         { 0x8142, 0xa0 },
0381         { 0x8143, 0xa0 },
0382         { 0x8144, 0x0a },
0383     };
0384 
0385     /* HDMI AC mode */
0386     if (lt9611->ac_mode)
0387         reg_cfg[2].def = 0x73;
0388 
0389     regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
0390 }
0391 
0392 static irqreturn_t lt9611_irq_thread_handler(int irq, void *dev_id)
0393 {
0394     struct lt9611 *lt9611 = dev_id;
0395     unsigned int irq_flag0 = 0;
0396     unsigned int irq_flag3 = 0;
0397 
0398     regmap_read(lt9611->regmap, 0x820f, &irq_flag3);
0399     regmap_read(lt9611->regmap, 0x820c, &irq_flag0);
0400 
0401     /* hpd changed low */
0402     if (irq_flag3 & 0x80) {
0403         dev_info(lt9611->dev, "hdmi cable disconnected\n");
0404 
0405         regmap_write(lt9611->regmap, 0x8207, 0xbf);
0406         regmap_write(lt9611->regmap, 0x8207, 0x3f);
0407     }
0408 
0409     /* hpd changed high */
0410     if (irq_flag3 & 0x40) {
0411         dev_info(lt9611->dev, "hdmi cable connected\n");
0412 
0413         regmap_write(lt9611->regmap, 0x8207, 0x7f);
0414         regmap_write(lt9611->regmap, 0x8207, 0x3f);
0415     }
0416 
0417     if (irq_flag3 & 0xc0 && lt9611->bridge.dev)
0418         drm_kms_helper_hotplug_event(lt9611->bridge.dev);
0419 
0420     /* video input changed */
0421     if (irq_flag0 & 0x01) {
0422         dev_info(lt9611->dev, "video input changed\n");
0423         regmap_write(lt9611->regmap, 0x829e, 0xff);
0424         regmap_write(lt9611->regmap, 0x829e, 0xf7);
0425         regmap_write(lt9611->regmap, 0x8204, 0xff);
0426         regmap_write(lt9611->regmap, 0x8204, 0xfe);
0427     }
0428 
0429     return IRQ_HANDLED;
0430 }
0431 
0432 static void lt9611_enable_hpd_interrupts(struct lt9611 *lt9611)
0433 {
0434     unsigned int val;
0435 
0436     regmap_read(lt9611->regmap, 0x8203, &val);
0437 
0438     val &= ~0xc0;
0439     regmap_write(lt9611->regmap, 0x8203, val);
0440     regmap_write(lt9611->regmap, 0x8207, 0xff); /* clear */
0441     regmap_write(lt9611->regmap, 0x8207, 0x3f);
0442 }
0443 
0444 static void lt9611_sleep_setup(struct lt9611 *lt9611)
0445 {
0446     const struct reg_sequence sleep_setup[] = {
0447         { 0x8024, 0x76 },
0448         { 0x8023, 0x01 },
0449         { 0x8157, 0x03 }, /* set addr pin as output */
0450         { 0x8149, 0x0b },
0451         { 0x8151, 0x30 }, /* disable IRQ */
0452         { 0x8102, 0x48 }, /* MIPI Rx power down */
0453         { 0x8123, 0x80 },
0454         { 0x8130, 0x00 },
0455         { 0x8100, 0x01 }, /* bandgap power down */
0456         { 0x8101, 0x00 }, /* system clk power down */
0457     };
0458 
0459     regmap_multi_reg_write(lt9611->regmap,
0460                    sleep_setup, ARRAY_SIZE(sleep_setup));
0461     lt9611->sleep = true;
0462 }
0463 
0464 static int lt9611_power_on(struct lt9611 *lt9611)
0465 {
0466     int ret;
0467     const struct reg_sequence seq[] = {
0468         /* LT9611_System_Init */
0469         { 0x8101, 0x18 }, /* sel xtal clock */
0470 
0471         /* timer for frequency meter */
0472         { 0x821b, 0x69 }, /* timer 2 */
0473         { 0x821c, 0x78 },
0474         { 0x82cb, 0x69 }, /* timer 1 */
0475         { 0x82cc, 0x78 },
0476 
0477         /* irq init */
0478         { 0x8251, 0x01 },
0479         { 0x8258, 0x0a }, /* hpd irq */
0480         { 0x8259, 0x80 }, /* hpd debounce width */
0481         { 0x829e, 0xf7 }, /* video check irq */
0482 
0483         /* power consumption for work */
0484         { 0x8004, 0xf0 },
0485         { 0x8006, 0xf0 },
0486         { 0x800a, 0x80 },
0487         { 0x800b, 0x40 },
0488         { 0x800d, 0xef },
0489         { 0x8011, 0xfa },
0490     };
0491 
0492     if (lt9611->power_on)
0493         return 0;
0494 
0495     ret = regmap_multi_reg_write(lt9611->regmap, seq, ARRAY_SIZE(seq));
0496     if (!ret)
0497         lt9611->power_on = true;
0498 
0499     return ret;
0500 }
0501 
0502 static int lt9611_power_off(struct lt9611 *lt9611)
0503 {
0504     int ret;
0505 
0506     ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
0507     if (!ret)
0508         lt9611->power_on = false;
0509 
0510     return ret;
0511 }
0512 
0513 static void lt9611_reset(struct lt9611 *lt9611)
0514 {
0515     gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
0516     msleep(20);
0517 
0518     gpiod_set_value_cansleep(lt9611->reset_gpio, 0);
0519     msleep(20);
0520 
0521     gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
0522     msleep(100);
0523 }
0524 
0525 static void lt9611_assert_5v(struct lt9611 *lt9611)
0526 {
0527     if (!lt9611->enable_gpio)
0528         return;
0529 
0530     gpiod_set_value_cansleep(lt9611->enable_gpio, 1);
0531     msleep(20);
0532 }
0533 
0534 static int lt9611_regulator_init(struct lt9611 *lt9611)
0535 {
0536     int ret;
0537 
0538     lt9611->supplies[0].supply = "vdd";
0539     lt9611->supplies[1].supply = "vcc";
0540 
0541     ret = devm_regulator_bulk_get(lt9611->dev, 2, lt9611->supplies);
0542     if (ret < 0)
0543         return ret;
0544 
0545     return regulator_set_load(lt9611->supplies[0].consumer, 300000);
0546 }
0547 
0548 static int lt9611_regulator_enable(struct lt9611 *lt9611)
0549 {
0550     int ret;
0551 
0552     ret = regulator_enable(lt9611->supplies[0].consumer);
0553     if (ret < 0)
0554         return ret;
0555 
0556     usleep_range(1000, 10000);
0557 
0558     ret = regulator_enable(lt9611->supplies[1].consumer);
0559     if (ret < 0) {
0560         regulator_disable(lt9611->supplies[0].consumer);
0561         return ret;
0562     }
0563 
0564     return 0;
0565 }
0566 
0567 static struct lt9611_mode *lt9611_find_mode(const struct drm_display_mode *mode)
0568 {
0569     int i;
0570 
0571     for (i = 0; i < ARRAY_SIZE(lt9611_modes); i++) {
0572         if (lt9611_modes[i].hdisplay == mode->hdisplay &&
0573             lt9611_modes[i].vdisplay == mode->vdisplay &&
0574             lt9611_modes[i].vrefresh == drm_mode_vrefresh(mode)) {
0575             return &lt9611_modes[i];
0576         }
0577     }
0578 
0579     return NULL;
0580 }
0581 
0582 /* connector funcs */
0583 static enum drm_connector_status __lt9611_detect(struct lt9611 *lt9611)
0584 {
0585     unsigned int reg_val = 0;
0586     int connected = 0;
0587 
0588     regmap_read(lt9611->regmap, 0x825e, &reg_val);
0589     connected  = (reg_val & (BIT(2) | BIT(0)));
0590 
0591     lt9611->status = connected ?  connector_status_connected :
0592                 connector_status_disconnected;
0593 
0594     return lt9611->status;
0595 }
0596 
0597 static enum drm_connector_status
0598 lt9611_connector_detect(struct drm_connector *connector, bool force)
0599 {
0600     return __lt9611_detect(connector_to_lt9611(connector));
0601 }
0602 
0603 static int lt9611_read_edid(struct lt9611 *lt9611)
0604 {
0605     unsigned int temp;
0606     int ret = 0;
0607     int i, j;
0608 
0609     /* memset to clear old buffer, if any */
0610     memset(lt9611->edid_buf, 0, sizeof(lt9611->edid_buf));
0611 
0612     regmap_write(lt9611->regmap, 0x8503, 0xc9);
0613 
0614     /* 0xA0 is EDID device address */
0615     regmap_write(lt9611->regmap, 0x8504, 0xa0);
0616     /* 0x00 is EDID offset address */
0617     regmap_write(lt9611->regmap, 0x8505, 0x00);
0618 
0619     /* length for read */
0620     regmap_write(lt9611->regmap, 0x8506, EDID_LEN);
0621     regmap_write(lt9611->regmap, 0x8514, 0x7f);
0622 
0623     for (i = 0; i < EDID_LOOP; i++) {
0624         /* offset address */
0625         regmap_write(lt9611->regmap, 0x8505, i * EDID_LEN);
0626         regmap_write(lt9611->regmap, 0x8507, 0x36);
0627         regmap_write(lt9611->regmap, 0x8507, 0x31);
0628         regmap_write(lt9611->regmap, 0x8507, 0x37);
0629         usleep_range(5000, 10000);
0630 
0631         regmap_read(lt9611->regmap, 0x8540, &temp);
0632 
0633         if (temp & KEY_DDC_ACCS_DONE) {
0634             for (j = 0; j < EDID_LEN; j++) {
0635                 regmap_read(lt9611->regmap, 0x8583, &temp);
0636                 lt9611->edid_buf[i * EDID_LEN + j] = temp;
0637             }
0638 
0639         } else if (temp & DDC_NO_ACK) { /* DDC No Ack or Abitration lost */
0640             dev_err(lt9611->dev, "read edid failed: no ack\n");
0641             ret = -EIO;
0642             goto end;
0643 
0644         } else {
0645             dev_err(lt9611->dev, "read edid failed: access not done\n");
0646             ret = -EIO;
0647             goto end;
0648         }
0649     }
0650 
0651 end:
0652     regmap_write(lt9611->regmap, 0x8507, 0x1f);
0653     return ret;
0654 }
0655 
0656 static int
0657 lt9611_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
0658 {
0659     struct lt9611 *lt9611 = data;
0660     int ret;
0661 
0662     if (len > 128)
0663         return -EINVAL;
0664 
0665     /* supports up to 1 extension block */
0666     /* TODO: add support for more extension blocks */
0667     if (block > 1)
0668         return -EINVAL;
0669 
0670     if (block == 0) {
0671         ret = lt9611_read_edid(lt9611);
0672         if (ret) {
0673             dev_err(lt9611->dev, "edid read failed\n");
0674             return ret;
0675         }
0676     }
0677 
0678     block %= 2;
0679     memcpy(buf, lt9611->edid_buf + (block * 128), len);
0680 
0681     return 0;
0682 }
0683 
0684 static int lt9611_connector_get_modes(struct drm_connector *connector)
0685 {
0686     struct lt9611 *lt9611 = connector_to_lt9611(connector);
0687     unsigned int count;
0688     struct edid *edid;
0689 
0690     lt9611_power_on(lt9611);
0691     edid = drm_do_get_edid(connector, lt9611_get_edid_block, lt9611);
0692     drm_connector_update_edid_property(connector, edid);
0693     count = drm_add_edid_modes(connector, edid);
0694     kfree(edid);
0695 
0696     return count;
0697 }
0698 
0699 static enum drm_mode_status
0700 lt9611_connector_mode_valid(struct drm_connector *connector,
0701                 struct drm_display_mode *mode)
0702 {
0703     struct lt9611_mode *lt9611_mode = lt9611_find_mode(mode);
0704 
0705     return lt9611_mode ? MODE_OK : MODE_BAD;
0706 }
0707 
0708 /* bridge funcs */
0709 static void
0710 lt9611_bridge_atomic_enable(struct drm_bridge *bridge,
0711                 struct drm_bridge_state *old_bridge_state)
0712 {
0713     struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
0714 
0715     if (lt9611_power_on(lt9611)) {
0716         dev_err(lt9611->dev, "power on failed\n");
0717         return;
0718     }
0719 
0720     lt9611_mipi_input_analog(lt9611);
0721     lt9611_hdmi_tx_digital(lt9611);
0722     lt9611_hdmi_tx_phy(lt9611);
0723 
0724     msleep(500);
0725 
0726     lt9611_video_check(lt9611);
0727 
0728     /* Enable HDMI output */
0729     regmap_write(lt9611->regmap, 0x8130, 0xea);
0730 }
0731 
0732 static void
0733 lt9611_bridge_atomic_disable(struct drm_bridge *bridge,
0734                  struct drm_bridge_state *old_bridge_state)
0735 {
0736     struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
0737     int ret;
0738 
0739     /* Disable HDMI output */
0740     ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
0741     if (ret) {
0742         dev_err(lt9611->dev, "video on failed\n");
0743         return;
0744     }
0745 
0746     if (lt9611_power_off(lt9611)) {
0747         dev_err(lt9611->dev, "power on failed\n");
0748         return;
0749     }
0750 }
0751 
0752 static struct
0753 drm_connector_helper_funcs lt9611_bridge_connector_helper_funcs = {
0754     .get_modes = lt9611_connector_get_modes,
0755     .mode_valid = lt9611_connector_mode_valid,
0756 };
0757 
0758 static const struct drm_connector_funcs lt9611_bridge_connector_funcs = {
0759     .fill_modes = drm_helper_probe_single_connector_modes,
0760     .detect = lt9611_connector_detect,
0761     .destroy = drm_connector_cleanup,
0762     .reset = drm_atomic_helper_connector_reset,
0763     .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
0764     .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
0765 };
0766 
0767 static struct mipi_dsi_device *lt9611_attach_dsi(struct lt9611 *lt9611,
0768                          struct device_node *dsi_node)
0769 {
0770     const struct mipi_dsi_device_info info = { "lt9611", 0, NULL };
0771     struct mipi_dsi_device *dsi;
0772     struct mipi_dsi_host *host;
0773     struct device *dev = lt9611->dev;
0774     int ret;
0775 
0776     host = of_find_mipi_dsi_host_by_node(dsi_node);
0777     if (!host) {
0778         dev_err(lt9611->dev, "failed to find dsi host\n");
0779         return ERR_PTR(-EPROBE_DEFER);
0780     }
0781 
0782     dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
0783     if (IS_ERR(dsi)) {
0784         dev_err(lt9611->dev, "failed to create dsi device\n");
0785         return dsi;
0786     }
0787 
0788     dsi->lanes = 4;
0789     dsi->format = MIPI_DSI_FMT_RGB888;
0790     dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
0791               MIPI_DSI_MODE_VIDEO_HSE;
0792 
0793     ret = devm_mipi_dsi_attach(dev, dsi);
0794     if (ret < 0) {
0795         dev_err(dev, "failed to attach dsi to host\n");
0796         return ERR_PTR(ret);
0797     }
0798 
0799     return dsi;
0800 }
0801 
0802 static int lt9611_connector_init(struct drm_bridge *bridge, struct lt9611 *lt9611)
0803 {
0804     int ret;
0805 
0806     ret = drm_connector_init(bridge->dev, &lt9611->connector,
0807                  &lt9611_bridge_connector_funcs,
0808                  DRM_MODE_CONNECTOR_HDMIA);
0809     if (ret) {
0810         DRM_ERROR("Failed to initialize connector with drm\n");
0811         return ret;
0812     }
0813 
0814     drm_connector_helper_add(&lt9611->connector,
0815                  &lt9611_bridge_connector_helper_funcs);
0816     drm_connector_attach_encoder(&lt9611->connector, bridge->encoder);
0817 
0818     if (!bridge->encoder) {
0819         DRM_ERROR("Parent encoder object not found");
0820         return -ENODEV;
0821     }
0822 
0823     return 0;
0824 }
0825 
0826 static int lt9611_bridge_attach(struct drm_bridge *bridge,
0827                 enum drm_bridge_attach_flags flags)
0828 {
0829     struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
0830     int ret;
0831 
0832     if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
0833         ret = lt9611_connector_init(bridge, lt9611);
0834         if (ret < 0)
0835             return ret;
0836     }
0837 
0838     return 0;
0839 }
0840 
0841 static enum drm_mode_status lt9611_bridge_mode_valid(struct drm_bridge *bridge,
0842                              const struct drm_display_info *info,
0843                              const struct drm_display_mode *mode)
0844 {
0845     struct lt9611_mode *lt9611_mode = lt9611_find_mode(mode);
0846     struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
0847 
0848     if (!lt9611_mode)
0849         return MODE_BAD;
0850     else if (lt9611_mode->intfs > 1 && !lt9611->dsi1)
0851         return MODE_PANEL;
0852     else
0853         return MODE_OK;
0854 }
0855 
0856 static void lt9611_bridge_pre_enable(struct drm_bridge *bridge)
0857 {
0858     struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
0859 
0860     if (!lt9611->sleep)
0861         return;
0862 
0863     lt9611_reset(lt9611);
0864     regmap_write(lt9611->regmap, 0x80ee, 0x01);
0865 
0866     lt9611->sleep = false;
0867 }
0868 
0869 static void
0870 lt9611_bridge_atomic_post_disable(struct drm_bridge *bridge,
0871                   struct drm_bridge_state *old_bridge_state)
0872 {
0873     struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
0874 
0875     lt9611_sleep_setup(lt9611);
0876 }
0877 
0878 static void lt9611_bridge_mode_set(struct drm_bridge *bridge,
0879                    const struct drm_display_mode *mode,
0880                    const struct drm_display_mode *adj_mode)
0881 {
0882     struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
0883     struct hdmi_avi_infoframe avi_frame;
0884     int ret;
0885 
0886     lt9611_bridge_pre_enable(bridge);
0887 
0888     lt9611_mipi_input_digital(lt9611, mode);
0889     lt9611_pll_setup(lt9611, mode);
0890     lt9611_mipi_video_setup(lt9611, mode);
0891     lt9611_pcr_setup(lt9611, mode);
0892 
0893     ret = drm_hdmi_avi_infoframe_from_display_mode(&avi_frame,
0894                                &lt9611->connector,
0895                                mode);
0896     if (!ret)
0897         lt9611->vic = avi_frame.video_code;
0898 }
0899 
0900 static enum drm_connector_status lt9611_bridge_detect(struct drm_bridge *bridge)
0901 {
0902     return __lt9611_detect(bridge_to_lt9611(bridge));
0903 }
0904 
0905 static struct edid *lt9611_bridge_get_edid(struct drm_bridge *bridge,
0906                        struct drm_connector *connector)
0907 {
0908     struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
0909 
0910     lt9611_power_on(lt9611);
0911     return drm_do_get_edid(connector, lt9611_get_edid_block, lt9611);
0912 }
0913 
0914 static void lt9611_bridge_hpd_enable(struct drm_bridge *bridge)
0915 {
0916     struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
0917 
0918     lt9611_enable_hpd_interrupts(lt9611);
0919 }
0920 
0921 #define MAX_INPUT_SEL_FORMATS   1
0922 
0923 static u32 *
0924 lt9611_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
0925                  struct drm_bridge_state *bridge_state,
0926                  struct drm_crtc_state *crtc_state,
0927                  struct drm_connector_state *conn_state,
0928                  u32 output_fmt,
0929                  unsigned int *num_input_fmts)
0930 {
0931     u32 *input_fmts;
0932 
0933     *num_input_fmts = 0;
0934 
0935     input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
0936                  GFP_KERNEL);
0937     if (!input_fmts)
0938         return NULL;
0939 
0940     /* This is the DSI-end bus format */
0941     input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
0942     *num_input_fmts = 1;
0943 
0944     return input_fmts;
0945 }
0946 
0947 static const struct drm_bridge_funcs lt9611_bridge_funcs = {
0948     .attach = lt9611_bridge_attach,
0949     .mode_valid = lt9611_bridge_mode_valid,
0950     .mode_set = lt9611_bridge_mode_set,
0951     .detect = lt9611_bridge_detect,
0952     .get_edid = lt9611_bridge_get_edid,
0953     .hpd_enable = lt9611_bridge_hpd_enable,
0954 
0955     .atomic_enable = lt9611_bridge_atomic_enable,
0956     .atomic_disable = lt9611_bridge_atomic_disable,
0957     .atomic_post_disable = lt9611_bridge_atomic_post_disable,
0958     .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
0959     .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
0960     .atomic_reset = drm_atomic_helper_bridge_reset,
0961     .atomic_get_input_bus_fmts = lt9611_atomic_get_input_bus_fmts,
0962 };
0963 
0964 static int lt9611_parse_dt(struct device *dev,
0965                struct lt9611 *lt9611)
0966 {
0967     lt9611->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
0968     if (!lt9611->dsi0_node) {
0969         dev_err(lt9611->dev, "failed to get remote node for primary dsi\n");
0970         return -ENODEV;
0971     }
0972 
0973     lt9611->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
0974 
0975     lt9611->ac_mode = of_property_read_bool(dev->of_node, "lt,ac-mode");
0976 
0977     return 0;
0978 }
0979 
0980 static int lt9611_gpio_init(struct lt9611 *lt9611)
0981 {
0982     struct device *dev = lt9611->dev;
0983 
0984     lt9611->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
0985     if (IS_ERR(lt9611->reset_gpio)) {
0986         dev_err(dev, "failed to acquire reset gpio\n");
0987         return PTR_ERR(lt9611->reset_gpio);
0988     }
0989 
0990     lt9611->enable_gpio = devm_gpiod_get_optional(dev, "enable",
0991                               GPIOD_OUT_LOW);
0992     if (IS_ERR(lt9611->enable_gpio)) {
0993         dev_err(dev, "failed to acquire enable gpio\n");
0994         return PTR_ERR(lt9611->enable_gpio);
0995     }
0996 
0997     return 0;
0998 }
0999 
1000 static int lt9611_read_device_rev(struct lt9611 *lt9611)
1001 {
1002     unsigned int rev;
1003     int ret;
1004 
1005     regmap_write(lt9611->regmap, 0x80ee, 0x01);
1006     ret = regmap_read(lt9611->regmap, 0x8002, &rev);
1007     if (ret)
1008         dev_err(lt9611->dev, "failed to read revision: %d\n", ret);
1009     else
1010         dev_info(lt9611->dev, "LT9611 revision: 0x%x\n", rev);
1011 
1012     return ret;
1013 }
1014 
1015 static int lt9611_hdmi_hw_params(struct device *dev, void *data,
1016                  struct hdmi_codec_daifmt *fmt,
1017                  struct hdmi_codec_params *hparms)
1018 {
1019     struct lt9611 *lt9611 = data;
1020 
1021     if (hparms->sample_rate == 48000)
1022         regmap_write(lt9611->regmap, 0x840f, 0x2b);
1023     else if (hparms->sample_rate == 96000)
1024         regmap_write(lt9611->regmap, 0x840f, 0xab);
1025     else
1026         return -EINVAL;
1027 
1028     regmap_write(lt9611->regmap, 0x8435, 0x00);
1029     regmap_write(lt9611->regmap, 0x8436, 0x18);
1030     regmap_write(lt9611->regmap, 0x8437, 0x00);
1031 
1032     return 0;
1033 }
1034 
1035 static int lt9611_audio_startup(struct device *dev, void *data)
1036 {
1037     struct lt9611 *lt9611 = data;
1038 
1039     regmap_write(lt9611->regmap, 0x82d6, 0x8c);
1040     regmap_write(lt9611->regmap, 0x82d7, 0x04);
1041 
1042     regmap_write(lt9611->regmap, 0x8406, 0x08);
1043     regmap_write(lt9611->regmap, 0x8407, 0x10);
1044 
1045     regmap_write(lt9611->regmap, 0x8434, 0xd5);
1046 
1047     return 0;
1048 }
1049 
1050 static void lt9611_audio_shutdown(struct device *dev, void *data)
1051 {
1052     struct lt9611 *lt9611 = data;
1053 
1054     regmap_write(lt9611->regmap, 0x8406, 0x00);
1055     regmap_write(lt9611->regmap, 0x8407, 0x00);
1056 }
1057 
1058 static int lt9611_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
1059                       struct device_node *endpoint)
1060 {
1061     struct of_endpoint of_ep;
1062     int ret;
1063 
1064     ret = of_graph_parse_endpoint(endpoint, &of_ep);
1065     if (ret < 0)
1066         return ret;
1067 
1068     /*
1069      * HDMI sound should be located as reg = <2>
1070      * Then, it is sound port 0
1071      */
1072     if (of_ep.port == 2)
1073         return 0;
1074 
1075     return -EINVAL;
1076 }
1077 
1078 static const struct hdmi_codec_ops lt9611_codec_ops = {
1079     .hw_params  = lt9611_hdmi_hw_params,
1080     .audio_shutdown = lt9611_audio_shutdown,
1081     .audio_startup  = lt9611_audio_startup,
1082     .get_dai_id = lt9611_hdmi_i2s_get_dai_id,
1083 };
1084 
1085 static struct hdmi_codec_pdata codec_data = {
1086     .ops = &lt9611_codec_ops,
1087     .max_i2s_channels = 8,
1088     .i2s = 1,
1089 };
1090 
1091 static int lt9611_audio_init(struct device *dev, struct lt9611 *lt9611)
1092 {
1093     codec_data.data = lt9611;
1094     lt9611->audio_pdev =
1095         platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
1096                           PLATFORM_DEVID_AUTO,
1097                           &codec_data, sizeof(codec_data));
1098 
1099     return PTR_ERR_OR_ZERO(lt9611->audio_pdev);
1100 }
1101 
1102 static void lt9611_audio_exit(struct lt9611 *lt9611)
1103 {
1104     if (lt9611->audio_pdev) {
1105         platform_device_unregister(lt9611->audio_pdev);
1106         lt9611->audio_pdev = NULL;
1107     }
1108 }
1109 
1110 static int lt9611_probe(struct i2c_client *client,
1111             const struct i2c_device_id *id)
1112 {
1113     struct lt9611 *lt9611;
1114     struct device *dev = &client->dev;
1115     int ret;
1116 
1117     if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1118         dev_err(dev, "device doesn't support I2C\n");
1119         return -ENODEV;
1120     }
1121 
1122     lt9611 = devm_kzalloc(dev, sizeof(*lt9611), GFP_KERNEL);
1123     if (!lt9611)
1124         return -ENOMEM;
1125 
1126     lt9611->dev = dev;
1127     lt9611->client = client;
1128     lt9611->sleep = false;
1129 
1130     lt9611->regmap = devm_regmap_init_i2c(client, &lt9611_regmap_config);
1131     if (IS_ERR(lt9611->regmap)) {
1132         dev_err(lt9611->dev, "regmap i2c init failed\n");
1133         return PTR_ERR(lt9611->regmap);
1134     }
1135 
1136     ret = lt9611_parse_dt(dev, lt9611);
1137     if (ret) {
1138         dev_err(dev, "failed to parse device tree\n");
1139         return ret;
1140     }
1141 
1142     ret = lt9611_gpio_init(lt9611);
1143     if (ret < 0)
1144         goto err_of_put;
1145 
1146     ret = lt9611_regulator_init(lt9611);
1147     if (ret < 0)
1148         goto err_of_put;
1149 
1150     lt9611_assert_5v(lt9611);
1151 
1152     ret = lt9611_regulator_enable(lt9611);
1153     if (ret)
1154         goto err_of_put;
1155 
1156     lt9611_reset(lt9611);
1157 
1158     ret = lt9611_read_device_rev(lt9611);
1159     if (ret) {
1160         dev_err(dev, "failed to read chip rev\n");
1161         goto err_disable_regulators;
1162     }
1163 
1164     ret = devm_request_threaded_irq(dev, client->irq, NULL,
1165                     lt9611_irq_thread_handler,
1166                     IRQF_ONESHOT, "lt9611", lt9611);
1167     if (ret) {
1168         dev_err(dev, "failed to request irq\n");
1169         goto err_disable_regulators;
1170     }
1171 
1172     i2c_set_clientdata(client, lt9611);
1173 
1174     lt9611->bridge.funcs = &lt9611_bridge_funcs;
1175     lt9611->bridge.of_node = client->dev.of_node;
1176     lt9611->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
1177                  DRM_BRIDGE_OP_HPD | DRM_BRIDGE_OP_MODES;
1178     lt9611->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
1179 
1180     drm_bridge_add(&lt9611->bridge);
1181 
1182     /* Attach primary DSI */
1183     lt9611->dsi0 = lt9611_attach_dsi(lt9611, lt9611->dsi0_node);
1184     if (IS_ERR(lt9611->dsi0)) {
1185         ret = PTR_ERR(lt9611->dsi0);
1186         goto err_remove_bridge;
1187     }
1188 
1189     /* Attach secondary DSI, if specified */
1190     if (lt9611->dsi1_node) {
1191         lt9611->dsi1 = lt9611_attach_dsi(lt9611, lt9611->dsi1_node);
1192         if (IS_ERR(lt9611->dsi1)) {
1193             ret = PTR_ERR(lt9611->dsi1);
1194             goto err_remove_bridge;
1195         }
1196     }
1197 
1198     lt9611_enable_hpd_interrupts(lt9611);
1199 
1200     ret = lt9611_audio_init(dev, lt9611);
1201     if (ret)
1202         goto err_remove_bridge;
1203 
1204     return 0;
1205 
1206 err_remove_bridge:
1207     drm_bridge_remove(&lt9611->bridge);
1208 
1209 err_disable_regulators:
1210     regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
1211 
1212 err_of_put:
1213     of_node_put(lt9611->dsi1_node);
1214     of_node_put(lt9611->dsi0_node);
1215 
1216     return ret;
1217 }
1218 
1219 static int lt9611_remove(struct i2c_client *client)
1220 {
1221     struct lt9611 *lt9611 = i2c_get_clientdata(client);
1222 
1223     disable_irq(client->irq);
1224     lt9611_audio_exit(lt9611);
1225     drm_bridge_remove(&lt9611->bridge);
1226 
1227     regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
1228 
1229     of_node_put(lt9611->dsi1_node);
1230     of_node_put(lt9611->dsi0_node);
1231 
1232     return 0;
1233 }
1234 
1235 static struct i2c_device_id lt9611_id[] = {
1236     { "lontium,lt9611", 0 },
1237     {}
1238 };
1239 MODULE_DEVICE_TABLE(i2c, lt9611_id);
1240 
1241 static const struct of_device_id lt9611_match_table[] = {
1242     { .compatible = "lontium,lt9611" },
1243     { }
1244 };
1245 MODULE_DEVICE_TABLE(of, lt9611_match_table);
1246 
1247 static struct i2c_driver lt9611_driver = {
1248     .driver = {
1249         .name = "lt9611",
1250         .of_match_table = lt9611_match_table,
1251     },
1252     .probe = lt9611_probe,
1253     .remove = lt9611_remove,
1254     .id_table = lt9611_id,
1255 };
1256 module_i2c_driver(lt9611_driver);
1257 
1258 MODULE_LICENSE("GPL v2");
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