drm/bridge: Introduce LT9611 DSI to HDMI bridge
authorVinod Koul <vkoul@kernel.org>
Thu, 23 Jul 2020 16:34:42 +0000 (22:04 +0530)
committerSam Ravnborg <sam@ravnborg.org>
Sun, 26 Jul 2020 14:55:49 +0000 (16:55 +0200)
Lontium Lt9611 is a DSI to HDMI bridge which supports two DSI ports and
I2S port as an input and HDMI port as output

Co-developed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Co-developed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Tested-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> # fix lt9611_bridge_mode_valid
Link: https://patchwork.freedesktop.org/patch/msgid/20200723163442.1280414-4-vkoul@kernel.org
drivers/gpu/drm/bridge/Kconfig
drivers/gpu/drm/bridge/Makefile
drivers/gpu/drm/bridge/lontium-lt9611.c [new file with mode: 0644]

index 43271c2..c7f0dac 100644 (file)
@@ -48,6 +48,19 @@ config DRM_DISPLAY_CONNECTOR
          on ARM-based platforms. Saying Y here when this driver is not needed
          will not cause any issue.
 
+config DRM_LONTIUM_LT9611
+       tristate "Lontium LT9611 DSI/HDMI bridge"
+       select SND_SOC_HDMI_CODEC if SND_SOC
+       depends on OF
+       select DRM_PANEL_BRIDGE
+       select DRM_KMS_HELPER
+       select REGMAP_I2C
+       help
+         Driver for Lontium LT9611 DSI to HDMI bridge
+         chip driver that converts dual DSI and I2S to
+         HDMI signals
+         Please say Y if you have such hardware.
+
 config DRM_LVDS_CODEC
        tristate "Transparent LVDS encoders and decoders support"
        depends on OF
index d63d4b7..7d7c123 100644 (file)
@@ -2,6 +2,7 @@
 obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
 obj-$(CONFIG_DRM_CHRONTEL_CH7033) += chrontel-ch7033.o
 obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) += display-connector.o
+obj-$(CONFIG_DRM_LONTIUM_LT9611) += lontium-lt9611.o
 obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o
 obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
 obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
new file mode 100644 (file)
index 0000000..1009fc4
--- /dev/null
@@ -0,0 +1,1230 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2019-2020. Linaro Limited.
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include <sound/hdmi-codec.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+
+#define EDID_SEG_SIZE  256
+#define EDID_LEN       32
+#define EDID_LOOP      8
+#define KEY_DDC_ACCS_DONE 0x02
+#define DDC_NO_ACK     0x50
+
+#define LT9611_4LANES  0
+
+struct lt9611 {
+       struct device *dev;
+       struct drm_bridge bridge;
+       struct drm_connector connector;
+
+       struct regmap *regmap;
+
+       struct device_node *dsi0_node;
+       struct device_node *dsi1_node;
+       struct mipi_dsi_device *dsi0;
+       struct mipi_dsi_device *dsi1;
+       struct platform_device *audio_pdev;
+
+       bool ac_mode;
+
+       struct gpio_desc *reset_gpio;
+       struct gpio_desc *enable_gpio;
+
+       bool power_on;
+       bool sleep;
+
+       struct regulator_bulk_data supplies[2];
+
+       struct i2c_client *client;
+
+       enum drm_connector_status status;
+
+       u8 edid_buf[EDID_SEG_SIZE];
+       u32 vic;
+};
+
+#define LT9611_PAGE_CONTROL    0xff
+
+static const struct regmap_range_cfg lt9611_ranges[] = {
+       {
+               .name = "register_range",
+               .range_min =  0,
+               .range_max = 0x85ff,
+               .selector_reg = LT9611_PAGE_CONTROL,
+               .selector_mask = 0xff,
+               .selector_shift = 0,
+               .window_start = 0,
+               .window_len = 0x100,
+       },
+};
+
+static const struct regmap_config lt9611_regmap_config = {
+       .reg_bits = 8,
+       .val_bits = 8,
+       .max_register = 0xffff,
+       .ranges = lt9611_ranges,
+       .num_ranges = ARRAY_SIZE(lt9611_ranges),
+};
+
+struct lt9611_mode {
+       u16 hdisplay;
+       u16 vdisplay;
+       u8 vrefresh;
+       u8 lanes;
+       u8 intfs;
+};
+
+static struct lt9611_mode lt9611_modes[] = {
+       { 3840, 2160, 30, 4, 2 }, /* 3840x2160 24bit 30Hz 4Lane 2ports */
+       { 1920, 1080, 60, 4, 1 }, /* 1080P 24bit 60Hz 4lane 1port */
+       { 1920, 1080, 30, 3, 1 }, /* 1080P 24bit 30Hz 3lane 1port */
+       { 1920, 1080, 24, 3, 1 },
+       { 720, 480, 60, 4, 1 },
+       { 720, 576, 50, 2, 1 },
+       { 640, 480, 60, 2, 1 },
+};
+
+static struct lt9611 *bridge_to_lt9611(struct drm_bridge *bridge)
+{
+       return container_of(bridge, struct lt9611, bridge);
+}
+
+static struct lt9611 *connector_to_lt9611(struct drm_connector *connector)
+{
+       return container_of(connector, struct lt9611, connector);
+}
+
+static int lt9611_mipi_input_analog(struct lt9611 *lt9611)
+{
+       const struct reg_sequence reg_cfg[] = {
+               { 0x8106, 0x40 }, /* port A rx current */
+               { 0x810a, 0xfe }, /* port A ldo voltage set */
+               { 0x810b, 0xbf }, /* enable port A lprx */
+               { 0x8111, 0x40 }, /* port B rx current */
+               { 0x8115, 0xfe }, /* port B ldo voltage set */
+               { 0x8116, 0xbf }, /* enable port B lprx */
+
+               { 0x811c, 0x03 }, /* PortA clk lane no-LP mode */
+               { 0x8120, 0x03 }, /* PortB clk lane with-LP mode */
+       };
+
+       return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
+}
+
+static int lt9611_mipi_input_digital(struct lt9611 *lt9611,
+                                    const struct drm_display_mode *mode)
+{
+       struct reg_sequence reg_cfg[] = {
+               { 0x8300, LT9611_4LANES },
+               { 0x830a, 0x00 },
+               { 0x824f, 0x80 },
+               { 0x8250, 0x10 },
+               { 0x8302, 0x0a },
+               { 0x8306, 0x0a },
+       };
+
+       if (mode->hdisplay == 3840)
+               reg_cfg[1].def = 0x03;
+
+       return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
+}
+
+static void lt9611_mipi_video_setup(struct lt9611 *lt9611,
+                                   const struct drm_display_mode *mode)
+{
+       u32 h_total, hactive, hsync_len, hfront_porch, hsync_porch;
+       u32 v_total, vactive, vsync_len, vfront_porch, vsync_porch;
+
+       h_total = mode->htotal;
+       v_total = mode->vtotal;
+
+       hactive = mode->hdisplay;
+       hsync_len = mode->hsync_end - mode->hsync_start;
+       hfront_porch = mode->hsync_start - mode->hdisplay;
+       hsync_porch = hsync_len + mode->htotal - mode->hsync_end;
+
+       vactive = mode->vdisplay;
+       vsync_len = mode->vsync_end - mode->vsync_start;
+       vfront_porch = mode->vsync_start - mode->vdisplay;
+       vsync_porch = vsync_len + mode->vtotal - mode->vsync_end;
+
+       regmap_write(lt9611->regmap, 0x830d, (u8)(v_total / 256));
+       regmap_write(lt9611->regmap, 0x830e, (u8)(v_total % 256));
+
+       regmap_write(lt9611->regmap, 0x830f, (u8)(vactive / 256));
+       regmap_write(lt9611->regmap, 0x8310, (u8)(vactive % 256));
+
+       regmap_write(lt9611->regmap, 0x8311, (u8)(h_total / 256));
+       regmap_write(lt9611->regmap, 0x8312, (u8)(h_total % 256));
+
+       regmap_write(lt9611->regmap, 0x8313, (u8)(hactive / 256));
+       regmap_write(lt9611->regmap, 0x8314, (u8)(hactive % 256));
+
+       regmap_write(lt9611->regmap, 0x8315, (u8)(vsync_len % 256));
+       regmap_write(lt9611->regmap, 0x8316, (u8)(hsync_len % 256));
+
+       regmap_write(lt9611->regmap, 0x8317, (u8)(vfront_porch % 256));
+
+       regmap_write(lt9611->regmap, 0x8318, (u8)(vsync_porch % 256));
+
+       regmap_write(lt9611->regmap, 0x8319, (u8)(hfront_porch % 256));
+
+       regmap_write(lt9611->regmap, 0x831a, (u8)(hsync_porch / 256));
+       regmap_write(lt9611->regmap, 0x831b, (u8)(hsync_porch % 256));
+}
+
+static void lt9611_pcr_setup(struct lt9611 *lt9611, const struct drm_display_mode *mode)
+{
+       const struct reg_sequence reg_cfg[] = {
+               { 0x830b, 0x01 },
+               { 0x830c, 0x10 },
+               { 0x8348, 0x00 },
+               { 0x8349, 0x81 },
+
+               /* stage 1 */
+               { 0x8321, 0x4a },
+               { 0x8324, 0x71 },
+               { 0x8325, 0x30 },
+               { 0x832a, 0x01 },
+
+               /* stage 2 */
+               { 0x834a, 0x40 },
+               { 0x831d, 0x10 },
+
+               /* MK limit */
+               { 0x832d, 0x38 },
+               { 0x8331, 0x08 },
+       };
+       const struct reg_sequence reg_cfg2[] = {
+               { 0x830b, 0x03 },
+               { 0x830c, 0xd0 },
+               { 0x8348, 0x03 },
+               { 0x8349, 0xe0 },
+               { 0x8324, 0x72 },
+               { 0x8325, 0x00 },
+               { 0x832a, 0x01 },
+               { 0x834a, 0x10 },
+               { 0x831d, 0x10 },
+               { 0x8326, 0x37 },
+       };
+
+       regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
+
+       switch (mode->hdisplay) {
+       case 640:
+               regmap_write(lt9611->regmap, 0x8326, 0x14);
+               break;
+       case 1920:
+               regmap_write(lt9611->regmap, 0x8326, 0x37);
+               break;
+       case 3840:
+               regmap_multi_reg_write(lt9611->regmap, reg_cfg2, ARRAY_SIZE(reg_cfg2));
+               break;
+       }
+
+       /* pcr rst */
+       regmap_write(lt9611->regmap, 0x8011, 0x5a);
+       regmap_write(lt9611->regmap, 0x8011, 0xfa);
+}
+
+static int lt9611_pll_setup(struct lt9611 *lt9611, const struct drm_display_mode *mode)
+{
+       unsigned int pclk = mode->clock;
+       const struct reg_sequence reg_cfg[] = {
+               /* txpll init */
+               { 0x8123, 0x40 },
+               { 0x8124, 0x64 },
+               { 0x8125, 0x80 },
+               { 0x8126, 0x55 },
+               { 0x812c, 0x37 },
+               { 0x812f, 0x01 },
+               { 0x8126, 0x55 },
+               { 0x8127, 0x66 },
+               { 0x8128, 0x88 },
+       };
+
+       regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
+
+       if (pclk > 150000)
+               regmap_write(lt9611->regmap, 0x812d, 0x88);
+       else if (pclk > 70000)
+               regmap_write(lt9611->regmap, 0x812d, 0x99);
+       else
+               regmap_write(lt9611->regmap, 0x812d, 0xaa);
+
+       /*
+        * first divide pclk by 2 first
+        *  - write divide by 64k to 19:16 bits which means shift by 17
+        *  - write divide by 256 to 15:8 bits which means shift by 9
+        *  - write remainder to 7:0 bits, which means shift by 1
+        */
+       regmap_write(lt9611->regmap, 0x82e3, pclk >> 17); /* pclk[19:16] */
+       regmap_write(lt9611->regmap, 0x82e4, pclk >> 9);  /* pclk[15:8]  */
+       regmap_write(lt9611->regmap, 0x82e5, pclk >> 1);  /* pclk[7:0]   */
+
+       regmap_write(lt9611->regmap, 0x82de, 0x20);
+       regmap_write(lt9611->regmap, 0x82de, 0xe0);
+
+       regmap_write(lt9611->regmap, 0x8016, 0xf1);
+       regmap_write(lt9611->regmap, 0x8016, 0xf3);
+
+       return 0;
+}
+
+static int lt9611_read_video_check(struct lt9611 *lt9611, unsigned int reg)
+{
+       unsigned int temp, temp2;
+       int ret;
+
+       ret = regmap_read(lt9611->regmap, reg, &temp);
+       if (ret)
+               return ret;
+       temp <<= 8;
+       ret = regmap_read(lt9611->regmap, reg + 1, &temp2);
+       if (ret)
+               return ret;
+
+       return (temp + temp2);
+}
+
+static int lt9611_video_check(struct lt9611 *lt9611)
+{
+       u32 v_total, vactive, hactive_a, hactive_b, h_total_sysclk;
+       int temp;
+
+       /* top module video check */
+
+       /* vactive */
+       temp = lt9611_read_video_check(lt9611, 0x8282);
+       if (temp < 0)
+               goto end;
+       vactive = temp;
+
+       /* v_total */
+       temp = lt9611_read_video_check(lt9611, 0x826c);
+       if (temp < 0)
+               goto end;
+       v_total = temp;
+
+       /* h_total_sysclk */
+       temp = lt9611_read_video_check(lt9611, 0x8286);
+       if (temp < 0)
+               goto end;
+       h_total_sysclk = temp;
+
+       /* hactive_a */
+       temp = lt9611_read_video_check(lt9611, 0x8382);
+       if (temp < 0)
+               goto end;
+       hactive_a = temp / 3;
+
+       /* hactive_b */
+       temp = lt9611_read_video_check(lt9611, 0x8386);
+       if (temp < 0)
+               goto end;
+       hactive_b = temp / 3;
+
+       dev_info(lt9611->dev,
+                "video check: hactive_a=%d, hactive_b=%d, vactive=%d, v_total=%d, h_total_sysclk=%d\n",
+                hactive_a, hactive_b, vactive, v_total, h_total_sysclk);
+
+       return 0;
+
+end:
+       dev_err(lt9611->dev, "read video check error\n");
+       return temp;
+}
+
+static void lt9611_hdmi_tx_digital(struct lt9611 *lt9611)
+{
+       regmap_write(lt9611->regmap, 0x8443, 0x46 - lt9611->vic);
+       regmap_write(lt9611->regmap, 0x8447, lt9611->vic);
+       regmap_write(lt9611->regmap, 0x843d, 0x0a); /* UD1 infoframe */
+
+       regmap_write(lt9611->regmap, 0x82d6, 0x8c);
+       regmap_write(lt9611->regmap, 0x82d7, 0x04);
+}
+
+static void lt9611_hdmi_tx_phy(struct lt9611 *lt9611)
+{
+       struct reg_sequence reg_cfg[] = {
+               { 0x8130, 0x6a },
+               { 0x8131, 0x44 }, /* HDMI DC mode */
+               { 0x8132, 0x4a },
+               { 0x8133, 0x0b },
+               { 0x8134, 0x00 },
+               { 0x8135, 0x00 },
+               { 0x8136, 0x00 },
+               { 0x8137, 0x44 },
+               { 0x813f, 0x0f },
+               { 0x8140, 0xa0 },
+               { 0x8141, 0xa0 },
+               { 0x8142, 0xa0 },
+               { 0x8143, 0xa0 },
+               { 0x8144, 0x0a },
+       };
+
+       /* HDMI AC mode */
+       if (lt9611->ac_mode)
+               reg_cfg[2].def = 0x73;
+
+       regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
+}
+
+static irqreturn_t lt9611_irq_thread_handler(int irq, void *dev_id)
+{
+       struct lt9611 *lt9611 = dev_id;
+       unsigned int irq_flag0 = 0;
+       unsigned int irq_flag3 = 0;
+
+       regmap_read(lt9611->regmap, 0x820f, &irq_flag3);
+       regmap_read(lt9611->regmap, 0x820c, &irq_flag0);
+
+       /* hpd changed low */
+       if (irq_flag3 & 0x80) {
+               dev_info(lt9611->dev, "hdmi cable disconnected\n");
+
+               regmap_write(lt9611->regmap, 0x8207, 0xbf);
+               regmap_write(lt9611->regmap, 0x8207, 0x3f);
+       }
+
+       /* hpd changed high */
+       if (irq_flag3 & 0x40) {
+               dev_info(lt9611->dev, "hdmi cable connected\n");
+
+               regmap_write(lt9611->regmap, 0x8207, 0x7f);
+               regmap_write(lt9611->regmap, 0x8207, 0x3f);
+       }
+
+       if (irq_flag3 & 0xc0 && lt9611->bridge.dev)
+               drm_kms_helper_hotplug_event(lt9611->bridge.dev);
+
+       /* video input changed */
+       if (irq_flag0 & 0x01) {
+               dev_info(lt9611->dev, "video input changed\n");
+               regmap_write(lt9611->regmap, 0x829e, 0xff);
+               regmap_write(lt9611->regmap, 0x829e, 0xf7);
+               regmap_write(lt9611->regmap, 0x8204, 0xff);
+               regmap_write(lt9611->regmap, 0x8204, 0xfe);
+       }
+
+       return IRQ_HANDLED;
+}
+
+static void lt9611_enable_hpd_interrupts(struct lt9611 *lt9611)
+{
+       unsigned int val;
+
+       regmap_read(lt9611->regmap, 0x8203, &val);
+
+       val &= ~0xc0;
+       regmap_write(lt9611->regmap, 0x8203, val);
+       regmap_write(lt9611->regmap, 0x8207, 0xff); /* clear */
+       regmap_write(lt9611->regmap, 0x8207, 0x3f);
+}
+
+static void lt9611_sleep_setup(struct lt9611 *lt9611)
+{
+       const struct reg_sequence sleep_setup[] = {
+               { 0x8024, 0x76 },
+               { 0x8023, 0x01 },
+               { 0x8157, 0x03 }, /* set addr pin as output */
+               { 0x8149, 0x0b },
+               { 0x8151, 0x30 }, /* disable IRQ */
+               { 0x8102, 0x48 }, /* MIPI Rx power down */
+               { 0x8123, 0x80 },
+               { 0x8130, 0x00 },
+               { 0x8100, 0x01 }, /* bandgap power down */
+               { 0x8101, 0x00 }, /* system clk power down */
+       };
+
+       regmap_multi_reg_write(lt9611->regmap,
+                              sleep_setup, ARRAY_SIZE(sleep_setup));
+       lt9611->sleep = true;
+}
+
+static int lt9611_power_on(struct lt9611 *lt9611)
+{
+       int ret;
+       const struct reg_sequence seq[] = {
+               /* LT9611_System_Init */
+               { 0x8101, 0x18 }, /* sel xtal clock */
+
+               /* timer for frequency meter */
+               { 0x821b, 0x69 }, /* timer 2 */
+               { 0x821c, 0x78 },
+               { 0x82cb, 0x69 }, /* timer 1 */
+               { 0x82cc, 0x78 },
+
+               /* irq init */
+               { 0x8251, 0x01 },
+               { 0x8258, 0x0a }, /* hpd irq */
+               { 0x8259, 0x80 }, /* hpd debounce width */
+               { 0x829e, 0xf7 }, /* video check irq */
+
+               /* power consumption for work */
+               { 0x8004, 0xf0 },
+               { 0x8006, 0xf0 },
+               { 0x800a, 0x80 },
+               { 0x800b, 0x40 },
+               { 0x800d, 0xef },
+               { 0x8011, 0xfa },
+       };
+
+       if (lt9611->power_on)
+               return 0;
+
+       ret = regmap_multi_reg_write(lt9611->regmap, seq, ARRAY_SIZE(seq));
+       if (!ret)
+               lt9611->power_on = true;
+
+       return ret;
+}
+
+static int lt9611_power_off(struct lt9611 *lt9611)
+{
+       int ret;
+
+       ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
+       if (!ret)
+               lt9611->power_on = false;
+
+       return ret;
+}
+
+static void lt9611_reset(struct lt9611 *lt9611)
+{
+       gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
+       msleep(20);
+
+       gpiod_set_value_cansleep(lt9611->reset_gpio, 0);
+       msleep(20);
+
+       gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
+       msleep(100);
+}
+
+static void lt9611_assert_5v(struct lt9611 *lt9611)
+{
+       if (!lt9611->enable_gpio)
+               return;
+
+       gpiod_set_value_cansleep(lt9611->enable_gpio, 1);
+       msleep(20);
+}
+
+static int lt9611_regulator_init(struct lt9611 *lt9611)
+{
+       int ret;
+
+       lt9611->supplies[0].supply = "vdd";
+       lt9611->supplies[1].supply = "vcc";
+
+       ret = devm_regulator_bulk_get(lt9611->dev, 2, lt9611->supplies);
+       if (ret < 0)
+               return ret;
+
+       return regulator_set_load(lt9611->supplies[0].consumer, 300000);
+}
+
+static int lt9611_regulator_enable(struct lt9611 *lt9611)
+{
+       int ret;
+
+       ret = regulator_enable(lt9611->supplies[0].consumer);
+       if (ret < 0)
+               return ret;
+
+       usleep_range(1000, 10000);
+
+       ret = regulator_enable(lt9611->supplies[1].consumer);
+       if (ret < 0) {
+               regulator_disable(lt9611->supplies[0].consumer);
+               return ret;
+       }
+
+       return 0;
+}
+
+static struct lt9611_mode *lt9611_find_mode(const struct drm_display_mode *mode)
+{
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(lt9611_modes); i++) {
+               if (lt9611_modes[i].hdisplay == mode->hdisplay &&
+                   lt9611_modes[i].vdisplay == mode->vdisplay &&
+                   lt9611_modes[i].vrefresh == drm_mode_vrefresh(mode)) {
+                       return &lt9611_modes[i];
+               }
+       }
+
+       return NULL;
+}
+
+/* connector funcs */
+static enum drm_connector_status
+lt9611_connector_detect(struct drm_connector *connector, bool force)
+{
+       struct lt9611 *lt9611 = connector_to_lt9611(connector);
+       unsigned int reg_val = 0;
+       int connected = 0;
+
+       regmap_read(lt9611->regmap, 0x825e, &reg_val);
+       connected  = (reg_val & BIT(2));
+
+       lt9611->status = connected ?  connector_status_connected :
+                               connector_status_disconnected;
+
+       return lt9611->status;
+}
+
+static int lt9611_read_edid(struct lt9611 *lt9611)
+{
+       unsigned int temp;
+       int ret = 0;
+       int i, j;
+
+       /* memset to clear old buffer, if any */
+       memset(lt9611->edid_buf, 0, sizeof(lt9611->edid_buf));
+
+       regmap_write(lt9611->regmap, 0x8503, 0xc9);
+
+       /* 0xA0 is EDID device address */
+       regmap_write(lt9611->regmap, 0x8504, 0xa0);
+       /* 0x00 is EDID offset address */
+       regmap_write(lt9611->regmap, 0x8505, 0x00);
+
+       /* length for read */
+       regmap_write(lt9611->regmap, 0x8506, EDID_LEN);
+       regmap_write(lt9611->regmap, 0x8514, 0x7f);
+
+       for (i = 0; i < EDID_LOOP; i++) {
+               /* offset address */
+               regmap_write(lt9611->regmap, 0x8505, i * EDID_LEN);
+               regmap_write(lt9611->regmap, 0x8507, 0x36);
+               regmap_write(lt9611->regmap, 0x8507, 0x31);
+               regmap_write(lt9611->regmap, 0x8507, 0x37);
+               usleep_range(5000, 10000);
+
+               regmap_read(lt9611->regmap, 0x8540, &temp);
+
+               if (temp & KEY_DDC_ACCS_DONE) {
+                       for (j = 0; j < EDID_LEN; j++) {
+                               regmap_read(lt9611->regmap, 0x8583, &temp);
+                               lt9611->edid_buf[i * EDID_LEN + j] = temp;
+                       }
+
+               } else if (temp & DDC_NO_ACK) { /* DDC No Ack or Abitration lost */
+                       dev_err(lt9611->dev, "read edid failed: no ack\n");
+                       ret = -EIO;
+                       goto end;
+
+               } else {
+                       dev_err(lt9611->dev, "read edid failed: access not done\n");
+                       ret = -EIO;
+                       goto end;
+               }
+       }
+
+end:
+       regmap_write(lt9611->regmap, 0x8507, 0x1f);
+       return ret;
+}
+
+static int
+lt9611_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
+{
+       struct lt9611 *lt9611 = data;
+       int ret;
+
+       if (len > 128)
+               return -EINVAL;
+
+       /* supports up to 1 extension block */
+       /* TODO: add support for more extension blocks */
+       if (block > 1)
+               return -EINVAL;
+
+       if (block == 0) {
+               ret = lt9611_read_edid(lt9611);
+               if (ret) {
+                       dev_err(lt9611->dev, "edid read failed\n");
+                       return ret;
+               }
+       }
+
+       block %= 2;
+       memcpy(buf, lt9611->edid_buf + (block * 128), len);
+
+       return 0;
+}
+
+static int lt9611_connector_get_modes(struct drm_connector *connector)
+{
+       struct lt9611 *lt9611 = connector_to_lt9611(connector);
+       unsigned int count;
+       struct edid *edid;
+
+       lt9611_power_on(lt9611);
+       edid = drm_do_get_edid(connector, lt9611_get_edid_block, lt9611);
+       drm_connector_update_edid_property(connector, edid);
+       count = drm_add_edid_modes(connector, edid);
+       kfree(edid);
+
+       return count;
+}
+
+static enum drm_mode_status
+lt9611_connector_mode_valid(struct drm_connector *connector,
+                           struct drm_display_mode *mode)
+{
+       struct lt9611_mode *lt9611_mode = lt9611_find_mode(mode);
+
+       return lt9611_mode ? MODE_OK : MODE_BAD;
+}
+
+/* bridge funcs */
+static void lt9611_bridge_enable(struct drm_bridge *bridge)
+{
+       struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+
+       if (lt9611_power_on(lt9611)) {
+               dev_err(lt9611->dev, "power on failed\n");
+               return;
+       }
+
+       lt9611_mipi_input_analog(lt9611);
+       lt9611_hdmi_tx_digital(lt9611);
+       lt9611_hdmi_tx_phy(lt9611);
+
+       msleep(500);
+
+       lt9611_video_check(lt9611);
+
+       /* Enable HDMI output */
+       regmap_write(lt9611->regmap, 0x8130, 0xea);
+}
+
+static void lt9611_bridge_disable(struct drm_bridge *bridge)
+{
+       struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+       int ret;
+
+       /* Disable HDMI output */
+       ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
+       if (ret) {
+               dev_err(lt9611->dev, "video on failed\n");
+               return;
+       }
+
+       if (lt9611_power_off(lt9611)) {
+               dev_err(lt9611->dev, "power on failed\n");
+               return;
+       }
+}
+
+static struct
+drm_connector_helper_funcs lt9611_bridge_connector_helper_funcs = {
+       .get_modes = lt9611_connector_get_modes,
+       .mode_valid = lt9611_connector_mode_valid,
+};
+
+static const struct drm_connector_funcs lt9611_bridge_connector_funcs = {
+       .fill_modes = drm_helper_probe_single_connector_modes,
+       .detect = lt9611_connector_detect,
+       .destroy = drm_connector_cleanup,
+       .reset = drm_atomic_helper_connector_reset,
+       .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+       .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static struct mipi_dsi_device *lt9611_attach_dsi(struct lt9611 *lt9611,
+                                                struct device_node *dsi_node)
+{
+       const struct mipi_dsi_device_info info = { "lt9611", 0, NULL };
+       struct mipi_dsi_device *dsi;
+       struct mipi_dsi_host *host;
+       int ret;
+
+       host = of_find_mipi_dsi_host_by_node(dsi_node);
+       if (!host) {
+               dev_err(lt9611->dev, "failed to find dsi host\n");
+               return ERR_PTR(-EPROBE_DEFER);
+       }
+
+       dsi = mipi_dsi_device_register_full(host, &info);
+       if (IS_ERR(dsi)) {
+               dev_err(lt9611->dev, "failed to create dsi device\n");
+               return dsi;
+       }
+
+       dsi->lanes = 4;
+       dsi->format = MIPI_DSI_FMT_RGB888;
+       dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+                         MIPI_DSI_MODE_VIDEO_HSE;
+
+       ret = mipi_dsi_attach(dsi);
+       if (ret < 0) {
+               dev_err(lt9611->dev, "failed to attach dsi to host\n");
+               mipi_dsi_device_unregister(dsi);
+               return ERR_PTR(ret);
+       }
+
+       return dsi;
+}
+
+static void lt9611_bridge_detach(struct drm_bridge *bridge)
+{
+       struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+
+       if (lt9611->dsi1) {
+               mipi_dsi_detach(lt9611->dsi1);
+               mipi_dsi_device_unregister(lt9611->dsi1);
+       }
+
+       mipi_dsi_detach(lt9611->dsi0);
+       mipi_dsi_device_unregister(lt9611->dsi0);
+}
+
+static int lt9611_connector_init(struct drm_bridge *bridge, struct lt9611 *lt9611)
+{
+       int ret;
+
+       ret = drm_connector_init(bridge->dev, &lt9611->connector,
+                                &lt9611_bridge_connector_funcs,
+                                DRM_MODE_CONNECTOR_HDMIA);
+       if (ret) {
+               DRM_ERROR("Failed to initialize connector with drm\n");
+               return ret;
+       }
+
+       drm_connector_helper_add(&lt9611->connector,
+                                &lt9611_bridge_connector_helper_funcs);
+       drm_connector_attach_encoder(&lt9611->connector, bridge->encoder);
+
+       if (!bridge->encoder) {
+               DRM_ERROR("Parent encoder object not found");
+               return -ENODEV;
+       }
+
+       return 0;
+}
+
+static int lt9611_bridge_attach(struct drm_bridge *bridge,
+                               enum drm_bridge_attach_flags flags)
+{
+       struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+       int ret;
+
+       if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
+               ret = lt9611_connector_init(bridge, lt9611);
+               if (ret < 0)
+                       return ret;
+       }
+
+       /* Attach primary DSI */
+       lt9611->dsi0 = lt9611_attach_dsi(lt9611, lt9611->dsi0_node);
+       if (IS_ERR(lt9611->dsi0))
+               return PTR_ERR(lt9611->dsi0);
+
+       /* Attach secondary DSI, if specified */
+       if (lt9611->dsi1_node) {
+               lt9611->dsi1 = lt9611_attach_dsi(lt9611, lt9611->dsi1_node);
+               if (IS_ERR(lt9611->dsi1)) {
+                       ret = PTR_ERR(lt9611->dsi1);
+                       goto err_unregister_dsi0;
+               }
+       }
+
+       return 0;
+
+err_unregister_dsi0:
+       lt9611_bridge_detach(bridge);
+       drm_connector_cleanup(&lt9611->connector);
+       mipi_dsi_device_unregister(lt9611->dsi0);
+
+       return ret;
+}
+
+static enum drm_mode_status lt9611_bridge_mode_valid(struct drm_bridge *bridge,
+                                                    const struct drm_display_info *info,
+                                                    const struct drm_display_mode *mode)
+{
+       struct lt9611_mode *lt9611_mode = lt9611_find_mode(mode);
+
+       return lt9611_mode ? MODE_OK : MODE_BAD;
+}
+
+static void lt9611_bridge_pre_enable(struct drm_bridge *bridge)
+{
+       struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+
+       if (!lt9611->sleep)
+               return;
+
+       lt9611_reset(lt9611);
+       regmap_write(lt9611->regmap, 0x80ee, 0x01);
+
+       lt9611->sleep = false;
+}
+
+static void lt9611_bridge_post_disable(struct drm_bridge *bridge)
+{
+       struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+
+       lt9611_sleep_setup(lt9611);
+}
+
+static void lt9611_bridge_mode_set(struct drm_bridge *bridge,
+                                  const struct drm_display_mode *mode,
+                                  const struct drm_display_mode *adj_mode)
+{
+       struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+       struct hdmi_avi_infoframe avi_frame;
+       int ret;
+
+       lt9611_bridge_pre_enable(bridge);
+
+       lt9611_mipi_input_digital(lt9611, mode);
+       lt9611_pll_setup(lt9611, mode);
+       lt9611_mipi_video_setup(lt9611, mode);
+       lt9611_pcr_setup(lt9611, mode);
+
+       ret = drm_hdmi_avi_infoframe_from_display_mode(&avi_frame,
+                                                      &lt9611->connector,
+                                                      mode);
+       if (!ret)
+               lt9611->vic = avi_frame.video_code;
+}
+
+static enum drm_connector_status lt9611_bridge_detect(struct drm_bridge *bridge)
+{
+       struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+       unsigned int reg_val = 0;
+       int connected;
+
+       regmap_read(lt9611->regmap, 0x825e, &reg_val);
+       connected  = reg_val & BIT(2);
+
+       lt9611->status = connected ?  connector_status_connected :
+                               connector_status_disconnected;
+
+       return lt9611->status;
+}
+
+static struct edid *lt9611_bridge_get_edid(struct drm_bridge *bridge,
+                                          struct drm_connector *connector)
+{
+       struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+
+       lt9611_power_on(lt9611);
+       return drm_do_get_edid(connector, lt9611_get_edid_block, lt9611);
+}
+
+static void lt9611_bridge_hpd_enable(struct drm_bridge *bridge)
+{
+       struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+
+       lt9611_enable_hpd_interrupts(lt9611);
+}
+
+static const struct drm_bridge_funcs lt9611_bridge_funcs = {
+       .attach = lt9611_bridge_attach,
+       .detach = lt9611_bridge_detach,
+       .mode_valid = lt9611_bridge_mode_valid,
+       .enable = lt9611_bridge_enable,
+       .disable = lt9611_bridge_disable,
+       .post_disable = lt9611_bridge_post_disable,
+       .mode_set = lt9611_bridge_mode_set,
+       .detect = lt9611_bridge_detect,
+       .get_edid = lt9611_bridge_get_edid,
+       .hpd_enable = lt9611_bridge_hpd_enable,
+};
+
+static int lt9611_parse_dt(struct device *dev,
+                          struct lt9611 *lt9611)
+{
+       lt9611->dsi0_node = of_graph_get_remote_node(dev->of_node, 1, -1);
+       if (!lt9611->dsi0_node) {
+               dev_err(lt9611->dev, "failed to get remote node for primary dsi\n");
+               return -ENODEV;
+       }
+
+       lt9611->dsi1_node = of_graph_get_remote_node(dev->of_node, 2, -1);
+
+       lt9611->ac_mode = of_property_read_bool(dev->of_node, "lt,ac-mode");
+
+       return 0;
+}
+
+static int lt9611_gpio_init(struct lt9611 *lt9611)
+{
+       struct device *dev = lt9611->dev;
+
+       lt9611->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+       if (IS_ERR(lt9611->reset_gpio)) {
+               dev_err(dev, "failed to acquire reset gpio\n");
+               return PTR_ERR(lt9611->reset_gpio);
+       }
+
+       lt9611->enable_gpio = devm_gpiod_get_optional(dev, "enable",
+                                                     GPIOD_OUT_LOW);
+       if (IS_ERR(lt9611->enable_gpio)) {
+               dev_err(dev, "failed to acquire enable gpio\n");
+               return PTR_ERR(lt9611->enable_gpio);
+       }
+
+       return 0;
+}
+
+static int lt9611_read_device_rev(struct lt9611 *lt9611)
+{
+       unsigned int rev;
+       int ret;
+
+       regmap_write(lt9611->regmap, 0x80ee, 0x01);
+       ret = regmap_read(lt9611->regmap, 0x8002, &rev);
+       if (ret)
+               dev_err(lt9611->dev, "failed to read revision: %d\n", ret);
+       else
+               dev_info(lt9611->dev, "LT9611 revision: 0x%x\n", rev);
+
+       return ret;
+}
+
+static int lt9611_hdmi_hw_params(struct device *dev, void *data,
+                                struct hdmi_codec_daifmt *fmt,
+                                struct hdmi_codec_params *hparms)
+{
+       struct lt9611 *lt9611 = data;
+
+       if (hparms->sample_rate == 48000)
+               regmap_write(lt9611->regmap, 0x840f, 0x2b);
+       else if (hparms->sample_rate == 96000)
+               regmap_write(lt9611->regmap, 0x840f, 0xab);
+       else
+               return -EINVAL;
+
+       regmap_write(lt9611->regmap, 0x8435, 0x00);
+       regmap_write(lt9611->regmap, 0x8436, 0x18);
+       regmap_write(lt9611->regmap, 0x8437, 0x00);
+
+       return 0;
+}
+
+static int lt9611_audio_startup(struct device *dev, void *data)
+{
+       struct lt9611 *lt9611 = data;
+
+       regmap_write(lt9611->regmap, 0x82d6, 0x8c);
+       regmap_write(lt9611->regmap, 0x82d7, 0x04);
+
+       regmap_write(lt9611->regmap, 0x8406, 0x08);
+       regmap_write(lt9611->regmap, 0x8407, 0x10);
+
+       regmap_write(lt9611->regmap, 0x8434, 0xd5);
+
+       return 0;
+}
+
+static void lt9611_audio_shutdown(struct device *dev, void *data)
+{
+       struct lt9611 *lt9611 = data;
+
+       regmap_write(lt9611->regmap, 0x8406, 0x00);
+       regmap_write(lt9611->regmap, 0x8407, 0x00);
+}
+
+static int lt9611_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
+                                     struct device_node *endpoint)
+{
+       struct of_endpoint of_ep;
+       int ret;
+
+       ret = of_graph_parse_endpoint(endpoint, &of_ep);
+       if (ret < 0)
+               return ret;
+
+       /*
+        * HDMI sound should be located as reg = <2>
+        * Then, it is sound port 0
+        */
+       if (of_ep.port == 2)
+               return 0;
+
+       return -EINVAL;
+}
+
+static const struct hdmi_codec_ops lt9611_codec_ops = {
+       .hw_params      = lt9611_hdmi_hw_params,
+       .audio_shutdown = lt9611_audio_shutdown,
+       .audio_startup  = lt9611_audio_startup,
+       .get_dai_id     = lt9611_hdmi_i2s_get_dai_id,
+};
+
+static struct hdmi_codec_pdata codec_data = {
+       .ops = &lt9611_codec_ops,
+       .max_i2s_channels = 8,
+       .i2s = 1,
+};
+
+static int lt9611_audio_init(struct device *dev, struct lt9611 *lt9611)
+{
+       codec_data.data = lt9611;
+       lt9611->audio_pdev =
+               platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
+                                             PLATFORM_DEVID_AUTO,
+                                             &codec_data, sizeof(codec_data));
+
+       return PTR_ERR_OR_ZERO(lt9611->audio_pdev);
+}
+
+static void lt9611_audio_exit(struct lt9611 *lt9611)
+{
+       if (lt9611->audio_pdev) {
+               platform_device_unregister(lt9611->audio_pdev);
+               lt9611->audio_pdev = NULL;
+       }
+}
+
+static int lt9611_probe(struct i2c_client *client,
+                       const struct i2c_device_id *id)
+{
+       struct lt9611 *lt9611;
+       struct device *dev = &client->dev;
+       int ret;
+
+       if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+               dev_err(dev, "device doesn't support I2C\n");
+               return -ENODEV;
+       }
+
+       lt9611 = devm_kzalloc(dev, sizeof(*lt9611), GFP_KERNEL);
+       if (!lt9611)
+               return -ENOMEM;
+
+       lt9611->dev = &client->dev;
+       lt9611->client = client;
+       lt9611->sleep = false;
+
+       lt9611->regmap = devm_regmap_init_i2c(client, &lt9611_regmap_config);
+       if (IS_ERR(lt9611->regmap)) {
+               dev_err(lt9611->dev, "regmap i2c init failed\n");
+               return PTR_ERR(lt9611->regmap);
+       }
+
+       ret = lt9611_parse_dt(&client->dev, lt9611);
+       if (ret) {
+               dev_err(dev, "failed to parse device tree\n");
+               return ret;
+       }
+
+       ret = lt9611_gpio_init(lt9611);
+       if (ret < 0)
+               goto err_of_put;
+
+       ret = lt9611_regulator_init(lt9611);
+       if (ret < 0)
+               goto err_of_put;
+
+       lt9611_assert_5v(lt9611);
+
+       ret = lt9611_regulator_enable(lt9611);
+       if (ret)
+               goto err_of_put;
+
+       lt9611_reset(lt9611);
+
+       ret = lt9611_read_device_rev(lt9611);
+       if (ret) {
+               dev_err(dev, "failed to read chip rev\n");
+               goto err_disable_regulators;
+       }
+
+       ret = devm_request_threaded_irq(dev, client->irq, NULL,
+                                       lt9611_irq_thread_handler,
+                                       IRQF_ONESHOT, "lt9611", lt9611);
+       if (ret) {
+               dev_err(dev, "failed to request irq\n");
+               goto err_disable_regulators;
+       }
+
+       i2c_set_clientdata(client, lt9611);
+
+       lt9611->bridge.funcs = &lt9611_bridge_funcs;
+       lt9611->bridge.of_node = client->dev.of_node;
+       lt9611->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
+                            DRM_BRIDGE_OP_HPD | DRM_BRIDGE_OP_MODES;
+       lt9611->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
+
+       drm_bridge_add(&lt9611->bridge);
+
+       lt9611_enable_hpd_interrupts(lt9611);
+
+       return lt9611_audio_init(dev, lt9611);
+
+err_disable_regulators:
+       regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
+
+err_of_put:
+       of_node_put(lt9611->dsi1_node);
+       of_node_put(lt9611->dsi0_node);
+
+       return ret;
+}
+
+static int lt9611_remove(struct i2c_client *client)
+{
+       struct lt9611 *lt9611 = i2c_get_clientdata(client);
+
+       disable_irq(client->irq);
+       lt9611_audio_exit(lt9611);
+       drm_bridge_remove(&lt9611->bridge);
+
+       regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
+
+       of_node_put(lt9611->dsi1_node);
+       of_node_put(lt9611->dsi0_node);
+
+       return 0;
+}
+
+static struct i2c_device_id lt9611_id[] = {
+       { "lontium,lt9611", 0 },
+       {}
+};
+
+static const struct of_device_id lt9611_match_table[] = {
+       { .compatible = "lontium,lt9611" },
+       { }
+};
+MODULE_DEVICE_TABLE(of, lt9611_match_table);
+
+static struct i2c_driver lt9611_driver = {
+       .driver = {
+               .name = "lt9611",
+               .of_match_table = lt9611_match_table,
+       },
+       .probe = lt9611_probe,
+       .remove = lt9611_remove,
+       .id_table = lt9611_id,
+};
+module_i2c_driver(lt9611_driver);
+
+MODULE_LICENSE("GPL v2");