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From:   Vinay Simha BN <simhavcs@gmail.com>
Cc:     Vinay Simha BN <simhavcs@gmail.com>,
        Andrzej Hajda <a.hajda@samsung.com>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Jonas Karlman <jonas@kwiboo.se>,
        Jernej Skrabec <jernej.skrabec@siol.net>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        linux-kernel@vger.kernel.org (open list),
        dri-devel@lists.freedesktop.org (open list:DRM DRIVERS)
Subject: [PATCH v8 2/2] display/drm/bridge: TC358775 DSI/LVDS driver
Date:   Fri, 10 Jul 2020 19:11:28 +0530
Message-Id: <1594388491-15129-2-git-send-email-simhavcs@gmail.com>
In-Reply-To: <1594388491-15129-1-git-send-email-simhavcs@gmail.com>
References: <1594388491-15129-1-git-send-email-simhavcs@gmail.com>
To:     unlisted-recipients:; (no To-header on input)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

This driver is tested with two panels individually with Apq8016-IFC6309 board
https://www.inforcecomputing.com/products/single-board-computers-sbc/qualcomm-snapdragon-410-inforce-6309-micro-sbc

1. 1366x768@60 auo,b101xtn01 data-mapping = "jeida-24"
2. 800x480@60 innolux,at070tn92 data-mapping = "vesa-24"

- power off sequence in proper order
- put_unaligned_be16, put_unaligned_le32 macros used
- static function for mode_valid
- len initialized
- MODE_CLOCK_HIGH handled properly
- bus_formats handeld in mode_valid
- GENMASK and FIELD_PREP used
- Kconfig proper indentation
- error handling enpoint data-lanes
- check for bus_formats unsupported
- display_timings naming local variables
- help modified
- ~vsdelay dynamic value set based on the
  calculation of dsi speed, output speed, blanking
- panel->connector_type removed
- dual port implemented
- devm_drm_panel_bridge_add method used instead of panel
  description modified
- regulator enable and disable with proper orders and delays
  as per the spec
- removed drm_connector_status
- added bus_formats
- mdelay to usleep_range
- magic number to macros for CLRSI and mux registers
  description modified
- replaced u32 instead of uint32_t
- updated alphabetic order of headers
- added SPDX identifier license

Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>

---
v1:
 Initial version

v2:
* Andrzej Hajda review comments incorporated
  SPDX identifier
  development debug removed
  alphabetic order headers
  u32 instead of unit32_t
  magic numbers to macros for CLRSI and mux registers
  ignored return value

* Laurent Pinchart review comments incorporated
  mdelay to usleep_range
  bus_formats added

v3:
* Andrzej Hajda review comments incorporated
  drm_connector_status removed
  u32 rev removed and local variabl is used
  regulator enable disable with proper orders and delays
  as per the spec
  devm_drm_panel_bridge_add method used instead of panel
  description modified
  dual port implemented

v4:
* Sam Ravnborg review comments incorporated
  panel->connector_type removed

* Reported-by: kernel test robot <lkp@intel.com>
  parse_dt to static function
  removed the if (endpoint), since data-lanes has to be
  present for dsi dts ports

v5:
  ~vsdelay dynamic value set based on the
  calculation of dsi speed, output speed, blanking

v6:
* Sam Ravnborg review comments incorporated
  help modified
  display_timings naming local variables
  check for bus_formats unsupported
  error handling enpoint data-lanes

v7:
* Sam Ravnborg review comments incorporated
  Kconfig proper indentation
  GENMASK and FIELD_PREP used
  bus_formats handeld in mode_valid
  MODE_CLOCK_HIGH handled properly

* Reported-by: kernel test robot <lkp@intel.com>
  len initialized
  static function for mode_valid

v8:
* Andrzej Hajda review comments incorporated
  power off sequence in proper order
  put_unaligned_be16, put_unaligned_le32 macros used
* change log modified in reverse chronological order
---
 drivers/gpu/drm/bridge/Kconfig    |  10 +
 drivers/gpu/drm/bridge/Makefile   |   1 +
 drivers/gpu/drm/bridge/tc358775.c | 749 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 760 insertions(+)
 create mode 100644 drivers/gpu/drm/bridge/tc358775.c

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 43271c2..25c3097 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -181,6 +181,16 @@ config DRM_TOSHIBA_TC358768
 	help
 	  Toshiba TC358768AXBG/TC358778XBG DSI bridge chip driver.
 
+config DRM_TOSHIBA_TC358775
+	tristate "Toshiba TC358775 DSI/LVDS bridge"
+	depends on OF
+	select DRM_KMS_HELPER
+	select REGMAP_I2C
+	select DRM_PANEL
+	select DRM_MIPI_DSI
+	help
+	  Toshiba TC358775 DSI/LVDS bridge chip driver.
+
 config DRM_TI_TFP410
 	tristate "TI TFP410 DVI/HDMI bridge"
 	depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index d63d4b7..23c770b 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o
 obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o
 obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
 obj-$(CONFIG_DRM_TOSHIBA_TC358768) += tc358768.o
+obj-$(CONFIG_DRM_TOSHIBA_TC358775) += tc358775.o
 obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
 obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o
 obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
new file mode 100644
index 0000000..7da15cd
--- /dev/null
+++ b/drivers/gpu/drm/bridge/tc358775.c
@@ -0,0 +1,749 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * TC358775 DSI to LVDS bridge driver
+ *
+ * Copyright (C) 2020 SMART Wireless Computing
+ * Author: Vinay Simha BN <simhavcs@gmail.com>
+ *
+ */
+/* #define DEBUG */
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+
+#include <asm/unaligned.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_dp_helper.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_probe_helper.h>
+
+#define FLD_VAL(val, start, end) FIELD_PREP(GENMASK(start, end), val)
+
+/* Registers */
+
+/* DSI D-PHY Layer Registers */
+#define D0W_DPHYCONTTX  0x0004  /* Data Lane 0 DPHY Tx Control */
+#define CLW_DPHYCONTRX  0x0020  /* Clock Lane DPHY Rx Control */
+#define D0W_DPHYCONTRX  0x0024  /* Data Lane 0 DPHY Rx Control */
+#define D1W_DPHYCONTRX  0x0028  /* Data Lane 1 DPHY Rx Control */
+#define D2W_DPHYCONTRX  0x002C  /* Data Lane 2 DPHY Rx Control */
+#define D3W_DPHYCONTRX  0x0030  /* Data Lane 3 DPHY Rx Control */
+#define COM_DPHYCONTRX  0x0038  /* DPHY Rx Common Control */
+#define CLW_CNTRL       0x0040  /* Clock Lane Control */
+#define D0W_CNTRL       0x0044  /* Data Lane 0 Control */
+#define D1W_CNTRL       0x0048  /* Data Lane 1 Control */
+#define D2W_CNTRL       0x004C  /* Data Lane 2 Control */
+#define D3W_CNTRL       0x0050  /* Data Lane 3 Control */
+#define DFTMODE_CNTRL   0x0054  /* DFT Mode Control */
+
+/* DSI PPI Layer Registers */
+#define PPI_STARTPPI    0x0104  /* START control bit of PPI-TX function. */
+#define PPI_START_FUNCTION      1
+
+#define PPI_BUSYPPI     0x0108
+#define PPI_LINEINITCNT 0x0110  /* Line Initialization Wait Counter  */
+#define PPI_LPTXTIMECNT 0x0114
+#define PPI_LANEENABLE  0x0134  /* Enables each lane at the PPI layer. */
+#define PPI_TX_RX_TA    0x013C  /* DSI Bus Turn Around timing parameters */
+
+/* Analog timer function enable */
+#define PPI_CLS_ATMR    0x0140  /* Delay for Clock Lane in LPRX  */
+#define PPI_D0S_ATMR    0x0144  /* Delay for Data Lane 0 in LPRX */
+#define PPI_D1S_ATMR    0x0148  /* Delay for Data Lane 1 in LPRX */
+#define PPI_D2S_ATMR    0x014C  /* Delay for Data Lane 2 in LPRX */
+#define PPI_D3S_ATMR    0x0150  /* Delay for Data Lane 3 in LPRX */
+
+#define PPI_D0S_CLRSIPOCOUNT    0x0164  /* For lane 0 */
+#define PPI_D1S_CLRSIPOCOUNT    0x0168  /* For lane 1 */
+#define PPI_D2S_CLRSIPOCOUNT    0x016C  /* For lane 2 */
+#define PPI_D3S_CLRSIPOCOUNT    0x0170  /* For lane 3 */
+
+#define CLS_PRE         0x0180  /* Digital Counter inside of PHY IO */
+#define D0S_PRE         0x0184  /* Digital Counter inside of PHY IO */
+#define D1S_PRE         0x0188  /* Digital Counter inside of PHY IO */
+#define D2S_PRE         0x018C  /* Digital Counter inside of PHY IO */
+#define D3S_PRE         0x0190  /* Digital Counter inside of PHY IO */
+#define CLS_PREP        0x01A0  /* Digital Counter inside of PHY IO */
+#define D0S_PREP        0x01A4  /* Digital Counter inside of PHY IO */
+#define D1S_PREP        0x01A8  /* Digital Counter inside of PHY IO */
+#define D2S_PREP        0x01AC  /* Digital Counter inside of PHY IO */
+#define D3S_PREP        0x01B0  /* Digital Counter inside of PHY IO */
+#define CLS_ZERO        0x01C0  /* Digital Counter inside of PHY IO */
+#define D0S_ZERO        0x01C4  /* Digital Counter inside of PHY IO */
+#define D1S_ZERO        0x01C8  /* Digital Counter inside of PHY IO */
+#define D2S_ZERO        0x01CC  /* Digital Counter inside of PHY IO */
+#define D3S_ZERO        0x01D0  /* Digital Counter inside of PHY IO */
+
+#define PPI_CLRFLG      0x01E0  /* PRE Counters has reached set values */
+#define PPI_CLRSIPO     0x01E4  /* Clear SIPO values, Slave mode use only. */
+#define HSTIMEOUT       0x01F0  /* HS Rx Time Out Counter */
+#define HSTIMEOUTENABLE 0x01F4  /* Enable HS Rx Time Out Counter */
+#define DSI_STARTDSI    0x0204  /* START control bit of DSI-TX function */
+#define DSI_RX_START	1
+
+#define DSI_BUSYDSI     0x0208
+#define DSI_LANEENABLE  0x0210  /* Enables each lane at the Protocol layer. */
+#define DSI_LANESTATUS0 0x0214  /* Displays lane is in HS RX mode. */
+#define DSI_LANESTATUS1 0x0218  /* Displays lane is in ULPS or STOP state */
+
+#define DSI_INTSTATUS   0x0220  /* Interrupt Status */
+#define DSI_INTMASK     0x0224  /* Interrupt Mask */
+#define DSI_INTCLR      0x0228  /* Interrupt Clear */
+#define DSI_LPTXTO      0x0230  /* Low Power Tx Time Out Counter */
+
+#define DSIERRCNT       0x0300  /* DSI Error Count */
+#define APLCTRL         0x0400  /* Application Layer Control */
+#define RDPKTLN         0x0404  /* Command Read Packet Length */
+
+#define VPCTRL          0x0450  /* Video Path Control */
+#define HTIM1           0x0454  /* Horizontal Timing Control 1 */
+#define HTIM2           0x0458  /* Horizontal Timing Control 2 */
+#define VTIM1           0x045C  /* Vertical Timing Control 1 */
+#define VTIM2           0x0460  /* Vertical Timing Control 2 */
+#define VFUEN           0x0464  /* Video Frame Timing Update Enable */
+#define VFUEN_EN	BIT(0)  /* Upload Enable */
+
+/* Mux Input Select for LVDS LINK Input */
+#define LV_MX0003        0x0480  /* Bit 0 to 3 */
+#define LV_MX0407        0x0484  /* Bit 4 to 7 */
+#define LV_MX0811        0x0488  /* Bit 8 to 11 */
+#define LV_MX1215        0x048C  /* Bit 12 to 15 */
+#define LV_MX1619        0x0490  /* Bit 16 to 19 */
+#define LV_MX2023        0x0494  /* Bit 20 to 23 */
+#define LV_MX2427        0x0498  /* Bit 24 to 27 */
+#define LV_MX(b0, b1, b2, b3)	(FLD_VAL(b0, 4, 0) | FLD_VAL(b1, 12, 8) | \
+				FLD_VAL(b2, 20, 16) | FLD_VAL(b3, 28, 24))
+
+/* Input bit numbers used in mux registers */
+enum {
+	LVI_R0,
+	LVI_R1,
+	LVI_R2,
+	LVI_R3,
+	LVI_R4,
+	LVI_R5,
+	LVI_R6,
+	LVI_R7,
+	LVI_G0,
+	LVI_G1,
+	LVI_G2,
+	LVI_G3,
+	LVI_G4,
+	LVI_G5,
+	LVI_G6,
+	LVI_G7,
+	LVI_B0,
+	LVI_B1,
+	LVI_B2,
+	LVI_B3,
+	LVI_B4,
+	LVI_B5,
+	LVI_B6,
+	LVI_B7,
+	LVI_HS,
+	LVI_VS,
+	LVI_DE,
+	LVI_L0
+};
+
+#define LVCFG           0x049C  /* LVDS Configuration  */
+#define LVPHY0          0x04A0  /* LVDS PHY 0 */
+#define LV_PHY0_RST(v)          FLD_VAL(v, 22, 22) /* PHY reset */
+#define LV_PHY0_IS(v)           FLD_VAL(v, 15, 14)
+#define LV_PHY0_ND(v)           FLD_VAL(v, 4, 0) /* Frequency range select */
+#define LV_PHY0_PRBS_ON(v)      FLD_VAL(v, 20, 16) /* Clock/Data Flag pins */
+
+#define LVPHY1          0x04A4  /* LVDS PHY 1 */
+#define SYSSTAT         0x0500  /* System Status  */
+#define SYSRST          0x0504  /* System Reset  */
+
+#define SYS_RST_I2CS	BIT(0) /* Reset I2C-Slave controller */
+#define SYS_RST_I2CM	BIT(1) /* Reset I2C-Master controller */
+#define SYS_RST_LCD	BIT(2) /* Reset LCD controller */
+#define SYS_RST_BM	BIT(3) /* Reset Bus Management controller */
+#define SYS_RST_DSIRX	BIT(4) /* Reset DSI-RX and App controller */
+#define SYS_RST_REG	BIT(5) /* Reset Register module */
+
+/* GPIO Registers */
+#define GPIOC           0x0520  /* GPIO Control  */
+#define GPIOO           0x0524  /* GPIO Output  */
+#define GPIOI           0x0528  /* GPIO Input  */
+
+/* I2C Registers */
+#define I2CTIMCTRL      0x0540  /* I2C IF Timing and Enable Control */
+#define I2CMADDR        0x0544  /* I2C Master Addressing */
+#define WDATAQ          0x0548  /* Write Data Queue */
+#define RDATAQ          0x054C  /* Read Data Queue */
+
+/* Chip ID and Revision ID Register */
+#define IDREG           0x0580
+
+#define LPX_PERIOD		4
+#define TTA_GET			0x40000
+#define TTA_SURE		6
+#define SINGLE_LINK		1
+#define DUAL_LINK		2
+
+#define TC358775XBG_ID  0x00007500
+
+/* Debug Registers */
+#define DEBUG00         0x05A0  /* Debug */
+#define DEBUG01         0x05A4  /* LVDS Data */
+
+#define DSI_CLEN_BIT		BIT(0)
+#define DIVIDE_BY_3		3 /* PCLK=DCLK/3 */
+#define DIVIDE_BY_6		6 /* PCLK=DCLK/6 */
+#define LVCFG_LVEN_BIT		BIT(0)
+
+#define L0EN BIT(1)
+
+#define TC358775_VPCTRL_VSDELAY__MASK	0x3FF00000
+#define TC358775_VPCTRL_VSDELAY__SHIFT	20
+static inline u32 TC358775_VPCTRL_VSDELAY(uint32_t val)
+{
+	return ((val) << TC358775_VPCTRL_VSDELAY__SHIFT) &
+			TC358775_VPCTRL_VSDELAY__MASK;
+}
+
+#define TC358775_VPCTRL_OPXLFMT__MASK	0x00000100
+#define TC358775_VPCTRL_OPXLFMT__SHIFT	8
+static inline u32 TC358775_VPCTRL_OPXLFMT(uint32_t val)
+{
+	return ((val) << TC358775_VPCTRL_OPXLFMT__SHIFT) &
+			TC358775_VPCTRL_OPXLFMT__MASK;
+}
+
+#define TC358775_VPCTRL_MSF__MASK	0x00000001
+#define TC358775_VPCTRL_MSF__SHIFT	0
+static inline u32 TC358775_VPCTRL_MSF(uint32_t val)
+{
+	return ((val) << TC358775_VPCTRL_MSF__SHIFT) &
+			TC358775_VPCTRL_MSF__MASK;
+}
+
+#define TC358775_LVCFG_PCLKDIV__MASK	0x000000f0
+#define TC358775_LVCFG_PCLKDIV__SHIFT	4
+static inline u32 TC358775_LVCFG_PCLKDIV(uint32_t val)
+{
+	return ((val) << TC358775_LVCFG_PCLKDIV__SHIFT) &
+			TC358775_LVCFG_PCLKDIV__MASK;
+}
+
+#define TC358775_LVCFG_LVDLINK__MASK                         0x00000002
+#define TC358775_LVCFG_LVDLINK__SHIFT                        0
+static inline u32 TC358775_LVCFG_LVDLINK(uint32_t val)
+{
+	return ((val) << TC358775_LVCFG_LVDLINK__SHIFT) &
+			TC358775_LVCFG_LVDLINK__MASK;
+}
+
+enum tc358775_ports {
+	TC358775_DSI_IN,
+	TC358775_LVDS_OUT0,
+	TC358775_LVDS_OUT1,
+};
+
+struct tc_data {
+	struct i2c_client	*i2c;
+	struct device		*dev;
+
+	struct drm_bridge	bridge;
+	struct drm_bridge	*panel_bridge;
+
+	struct device_node *host_node;
+	struct mipi_dsi_device *dsi;
+	u8 num_dsi_lanes;
+
+	struct regulator	*vdd;
+	struct regulator	*vddio;
+	struct gpio_desc	*reset_gpio;
+	struct gpio_desc	*stby_gpio;
+	u8			lvds_link; /* single-link or dual-link */
+	u8			bpc;
+};
+
+static inline struct tc_data *bridge_to_tc(struct drm_bridge *b)
+{
+	return container_of(b, struct tc_data, bridge);
+}
+
+static void tc_bridge_pre_enable(struct drm_bridge *bridge)
+{
+	struct tc_data *tc = bridge_to_tc(bridge);
+	struct device *dev = &tc->dsi->dev;
+	int ret;
+
+	ret = regulator_enable(tc->vddio);
+	if (ret < 0)
+		dev_err(dev, "regulator vddio enable failed, %d\n", ret);
+	usleep_range(10000, 11000);
+
+	ret = regulator_enable(tc->vdd);
+	if (ret < 0)
+		dev_err(dev, "regulator vdd enable failed, %d\n", ret);
+	usleep_range(10000, 11000);
+
+	gpiod_set_value(tc->stby_gpio, 0);
+	usleep_range(10000, 11000);
+
+	gpiod_set_value(tc->reset_gpio, 0);
+	usleep_range(10, 20);
+}
+
+static void tc_bridge_post_disable(struct drm_bridge *bridge)
+{
+	struct tc_data *tc = bridge_to_tc(bridge);
+	struct device *dev = &tc->dsi->dev;
+	int ret;
+
+	gpiod_set_value(tc->reset_gpio, 1);
+	usleep_range(10, 20);
+
+	gpiod_set_value(tc->stby_gpio, 1);
+	usleep_range(10000, 11000);
+
+	ret = regulator_disable(tc->vdd);
+	if (ret < 0)
+		dev_err(dev, "regulator vdd disable failed, %d\n", ret);
+	usleep_range(10000, 11000);
+
+	ret = regulator_disable(tc->vddio);
+	if (ret < 0)
+		dev_err(dev, "regulator vddio disable failed, %d\n", ret);
+	usleep_range(10000, 11000);
+}
+
+static void d2l_read(struct i2c_client *i2c, u16 addr, u32 *val)
+{
+	int ret;
+	u8 buf_addr[2];
+
+	put_unaligned_be16(addr, buf_addr);
+	ret = i2c_master_send(i2c, buf_addr, sizeof(buf_addr));
+	if (ret < 0)
+		goto fail;
+
+	ret = i2c_master_recv(i2c, (u8 *)val, sizeof(*val));
+	if (ret < 0)
+		goto fail;
+
+	pr_debug("d2l: I2C : addr:%04x value:%08x\n", addr, *val);
+
+fail:
+	dev_err(&i2c->dev, "Error %d reading from subaddress 0x%x\n",
+		ret, addr);
+}
+
+static void d2l_write(struct i2c_client *i2c, u16 addr, u32 val)
+{
+	u8 data[6];
+	int ret;
+
+	put_unaligned_be16(addr, data);
+	put_unaligned_le32(val, data + 2);
+
+	ret = i2c_master_send(i2c, data, ARRAY_SIZE(data));
+	if (ret < 0)
+		dev_err(&i2c->dev, "Error %d writing to subaddress 0x%x\n",
+			ret, addr);
+}
+
+/* helper function to access bus_formats */
+static struct drm_connector *get_connector(struct drm_encoder *encoder)
+{
+	struct drm_device *dev = encoder->dev;
+	struct drm_connector *connector;
+
+	list_for_each_entry(connector, &dev->mode_config.connector_list, head)
+		if (connector->encoder == encoder)
+			return connector;
+
+	return NULL;
+}
+
+static void tc_bridge_enable(struct drm_bridge *bridge)
+{
+	struct tc_data *tc = bridge_to_tc(bridge);
+	u32 hback_porch, hsync_len, hfront_porch, hactive, htime1, htime2;
+	u32 vback_porch, vsync_len, vfront_porch, vactive, vtime1, vtime2;
+	u32 val = 0;
+	u16 dsiclk, clkdiv, byteclk, t1, t2, t3, vsdelay;
+	struct drm_display_mode *mode;
+	struct drm_connector *connector = get_connector(bridge->encoder);
+
+	mode = &bridge->encoder->crtc->state->adjusted_mode;
+
+	hback_porch = mode->htotal - mode->hsync_end;
+	hsync_len  = mode->hsync_end - mode->hsync_start;
+	vback_porch = mode->vtotal - mode->vsync_end;
+	vsync_len  = mode->vsync_end - mode->vsync_start;
+
+	htime1 = (hback_porch << 16) + hsync_len;
+	vtime1 = (vback_porch << 16) + vsync_len;
+
+	hfront_porch = mode->hsync_start - mode->hdisplay;
+	hactive = mode->hdisplay;
+	vfront_porch = mode->vsync_start - mode->vdisplay;
+	vactive = mode->vdisplay;
+
+	htime2 = (hfront_porch << 16) + hactive;
+	vtime2 = (vfront_porch << 16) + vactive;
+
+	d2l_read(tc->i2c, IDREG, &val);
+
+	dev_info(tc->dev, "DSI2LVDS Chip ID.%02x Revision ID. %02x **\n",
+		 (val >> 8) & 0xFF, val & 0xFF);
+
+	d2l_write(tc->i2c, SYSRST, SYS_RST_REG | SYS_RST_DSIRX | SYS_RST_BM |
+		  SYS_RST_LCD | SYS_RST_I2CM | SYS_RST_I2CS);
+	usleep_range(30000, 40000);
+
+	d2l_write(tc->i2c, PPI_TX_RX_TA, TTA_GET | TTA_SURE);
+	d2l_write(tc->i2c, PPI_LPTXTIMECNT, LPX_PERIOD);
+	d2l_write(tc->i2c, PPI_D0S_CLRSIPOCOUNT, 3);
+	d2l_write(tc->i2c, PPI_D1S_CLRSIPOCOUNT, 3);
+	d2l_write(tc->i2c, PPI_D2S_CLRSIPOCOUNT, 3);
+	d2l_write(tc->i2c, PPI_D3S_CLRSIPOCOUNT, 3);
+
+	val = ((L0EN << tc->num_dsi_lanes) - L0EN) | DSI_CLEN_BIT;
+	d2l_write(tc->i2c, PPI_LANEENABLE, val);
+	d2l_write(tc->i2c, DSI_LANEENABLE, val);
+
+	d2l_write(tc->i2c, PPI_STARTPPI, PPI_START_FUNCTION);
+	d2l_write(tc->i2c, DSI_STARTDSI, DSI_RX_START);
+
+	if (tc->bpc == 8)
+		val = TC358775_VPCTRL_OPXLFMT(1);
+	else /* bpc = 6; */
+		val = TC358775_VPCTRL_MSF(1);
+
+	dsiclk = mode->crtc_clock * 3 * tc->bpc / tc->num_dsi_lanes / 1000;
+	clkdiv = dsiclk / DIVIDE_BY_3 * tc->lvds_link;
+	byteclk = dsiclk / 4;
+	t1 = hactive * (tc->bpc * 3 / 8) / tc->num_dsi_lanes;
+	t2 = ((100000 / clkdiv)) * (hactive + hback_porch + hsync_len + hfront_porch) / 1000;
+	t3 = ((t2 * byteclk) / 100) - (hactive * (tc->bpc * 3 / 8) /
+		tc->num_dsi_lanes);
+
+	vsdelay = (clkdiv * (t1 + t3) / byteclk) - hback_porch - hsync_len - hactive;
+
+	val |= TC358775_VPCTRL_VSDELAY(vsdelay);
+	d2l_write(tc->i2c, VPCTRL, val);
+
+	d2l_write(tc->i2c, HTIM1, htime1);
+	d2l_write(tc->i2c, VTIM1, vtime1);
+	d2l_write(tc->i2c, HTIM2, htime2);
+	d2l_write(tc->i2c, VTIM2, vtime2);
+
+	d2l_write(tc->i2c, VFUEN, VFUEN_EN);
+	d2l_write(tc->i2c, SYSRST, SYS_RST_LCD);
+	d2l_write(tc->i2c, LVPHY0, LV_PHY0_PRBS_ON(4) | LV_PHY0_ND(6));
+
+	dev_dbg(tc->dev, "bus_formats %04x bpc %d\n",
+		connector->display_info.bus_formats[0],
+		tc->bpc);
+	/*
+	 * Default hardware register settings of tc358775 configured
+	 * with MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA jeida-24 format
+	 */
+	if (connector->display_info.bus_formats[0] ==
+		MEDIA_BUS_FMT_RGB888_1X7X4_SPWG) {
+		/* VESA-24 */
+		d2l_write(tc->i2c, LV_MX0003, LV_MX(LVI_R0, LVI_R1, LVI_R2, LVI_R3));
+		d2l_write(tc->i2c, LV_MX0407, LV_MX(LVI_R4, LVI_R7, LVI_R5, LVI_G0));
+		d2l_write(tc->i2c, LV_MX0811, LV_MX(LVI_G1, LVI_G2, LVI_G6, LVI_G7));
+		d2l_write(tc->i2c, LV_MX1215, LV_MX(LVI_G3, LVI_G4, LVI_G5, LVI_B0));
+		d2l_write(tc->i2c, LV_MX1619, LV_MX(LVI_B6, LVI_B7, LVI_B1, LVI_B2));
+		d2l_write(tc->i2c, LV_MX2023, LV_MX(LVI_B3, LVI_B4, LVI_B5, LVI_L0));
+		d2l_write(tc->i2c, LV_MX2427, LV_MX(LVI_HS, LVI_VS, LVI_DE, LVI_R6));
+	} else { /*  MEDIA_BUS_FMT_RGB666_1X7X3_SPWG - JEIDA-18 */
+		d2l_write(tc->i2c, LV_MX0003, LV_MX(LVI_R0, LVI_R1, LVI_R2, LVI_R3));
+		d2l_write(tc->i2c, LV_MX0407, LV_MX(LVI_R4, LVI_L0, LVI_R5, LVI_G0));
+		d2l_write(tc->i2c, LV_MX0811, LV_MX(LVI_G1, LVI_G2, LVI_L0, LVI_L0));
+		d2l_write(tc->i2c, LV_MX1215, LV_MX(LVI_G3, LVI_G4, LVI_G5, LVI_B0));
+		d2l_write(tc->i2c, LV_MX1619, LV_MX(LVI_L0, LVI_L0, LVI_B1, LVI_B2));
+		d2l_write(tc->i2c, LV_MX2023, LV_MX(LVI_B3, LVI_B4, LVI_B5, LVI_L0));
+		d2l_write(tc->i2c, LV_MX2427, LV_MX(LVI_HS, LVI_VS, LVI_DE, LVI_L0));
+	}
+
+	d2l_write(tc->i2c, VFUEN, VFUEN_EN);
+
+	val = LVCFG_LVEN_BIT;
+	if (tc->lvds_link == DUAL_LINK) {
+		val |= TC358775_LVCFG_LVDLINK(1);
+		val |= TC358775_LVCFG_PCLKDIV(DIVIDE_BY_6);
+	} else {
+		val |= TC358775_LVCFG_PCLKDIV(DIVIDE_BY_3);
+	};
+	d2l_write(tc->i2c, LVCFG, val);
+}
+
+static enum drm_mode_status
+tc_mode_valid(struct drm_bridge *bridge,
+	      const struct drm_display_info *info,
+	      const struct drm_display_mode *mode)
+{
+	struct tc_data *tc = bridge_to_tc(bridge);
+
+	/*
+	 * Maximum pixel clock speed 135MHz for single-link
+	 * 270MHz for dual-link
+	 */
+	if ((mode->clock > 135000 && tc->lvds_link == SINGLE_LINK) ||
+	    (mode->clock > 270000 && tc->lvds_link == DUAL_LINK))
+		return MODE_CLOCK_HIGH;
+
+	switch (info->bus_formats[0]) {
+	case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
+	case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
+		/* RGB888 */
+		tc->bpc = 8;
+		break;
+	case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
+		/* RGB666 */
+		tc->bpc = 6;
+		break;
+	default:
+		dev_warn(tc->dev,
+			 "unsupported LVDS bus format 0x%04x\n",
+			 info->bus_formats[0]);
+		return MODE_NOMODE;
+	}
+
+	return MODE_OK;
+}
+
+static int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
+{
+	struct device_node *endpoint;
+	struct device_node *parent;
+	struct device_node *remote;
+	struct property *prop;
+	int len = 0;
+
+	/*
+	 * To get the data-lanes of dsi, we need to access the dsi0_out of port1
+	 *  of dsi0 endpoint from bridge port0 of d2l_in
+	 */
+	endpoint = of_graph_get_endpoint_by_regs(tc->dev->of_node,
+						 TC358775_DSI_IN, -1);
+	if (endpoint) {
+		/* dsi0_out node */
+		parent = of_graph_get_remote_port_parent(endpoint);
+		of_node_put(endpoint);
+		if (parent) {
+			/* dsi0 port 1 */
+			endpoint = of_graph_get_endpoint_by_regs(parent, 1, -1);
+			of_node_put(parent);
+			if (endpoint) {
+				prop = of_find_property(endpoint, "data-lanes",
+							&len);
+				of_node_put(endpoint);
+				if (!prop) {
+					dev_err(tc->dev,
+						"failed to find data lane\n");
+					return -EPROBE_DEFER;
+				}
+			}
+		}
+	}
+
+	tc->num_dsi_lanes = len / sizeof(u32);
+
+	if (tc->num_dsi_lanes < 1 || tc->num_dsi_lanes > 4)
+		return -EINVAL;
+
+	tc->host_node = of_graph_get_remote_node(np, 0, 0);
+	if (!tc->host_node)
+		return -ENODEV;
+
+	of_node_put(tc->host_node);
+
+	tc->lvds_link = SINGLE_LINK;
+	endpoint = of_graph_get_endpoint_by_regs(tc->dev->of_node,
+						 TC358775_LVDS_OUT1, -1);
+	if (endpoint) {
+		remote = of_graph_get_remote_port_parent(endpoint);
+		of_node_put(endpoint);
+
+		if (remote) {
+			if (of_device_is_available(remote))
+				tc->lvds_link = DUAL_LINK;
+			of_node_put(remote);
+		}
+	}
+
+	dev_dbg(tc->dev, "no.of dsi lanes: %d\n", tc->num_dsi_lanes);
+	dev_dbg(tc->dev, "operating in %d-link mode\n",	tc->lvds_link);
+
+	return 0;
+}
+
+static int tc_bridge_attach(struct drm_bridge *bridge,
+			    enum drm_bridge_attach_flags flags)
+{
+	struct tc_data *tc = bridge_to_tc(bridge);
+	struct device *dev = &tc->i2c->dev;
+	struct mipi_dsi_host *host;
+	struct mipi_dsi_device *dsi;
+	int ret;
+
+	const struct mipi_dsi_device_info info = { .type = "tc358775",
+							.channel = 0,
+							.node = NULL,
+						};
+
+	host = of_find_mipi_dsi_host_by_node(tc->host_node);
+	if (!host) {
+		dev_err(dev, "failed to find dsi host\n");
+		return -EPROBE_DEFER;
+	}
+
+	dsi = mipi_dsi_device_register_full(host, &info);
+	if (IS_ERR(dsi)) {
+		dev_err(dev, "failed to create dsi device\n");
+		ret = PTR_ERR(dsi);
+		goto err_dsi_device;
+	}
+
+	tc->dsi = dsi;
+
+	dsi->lanes = tc->num_dsi_lanes;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		dev_err(dev, "failed to attach dsi to host\n");
+		goto err_dsi_attach;
+	}
+
+	/* Attach the panel-bridge to the dsi bridge */
+	return drm_bridge_attach(bridge->encoder, tc->panel_bridge,
+				 &tc->bridge, flags);
+err_dsi_attach:
+	mipi_dsi_device_unregister(dsi);
+err_dsi_device:
+	return ret;
+}
+
+static const struct drm_bridge_funcs tc_bridge_funcs = {
+	.attach = tc_bridge_attach,
+	.pre_enable = tc_bridge_pre_enable,
+	.enable = tc_bridge_enable,
+	.mode_valid = tc_mode_valid,
+	.post_disable = tc_bridge_post_disable,
+};
+
+static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct drm_panel *panel;
+	struct tc_data *tc;
+	int ret;
+
+	tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL);
+	if (!tc)
+		return -ENOMEM;
+
+	tc->dev = dev;
+	tc->i2c = client;
+
+	ret = drm_of_find_panel_or_bridge(dev->of_node, TC358775_LVDS_OUT0,
+					  0, &panel, NULL);
+	if (ret < 0)
+		return ret;
+	if (!panel)
+		return -ENODEV;
+
+	tc->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
+	if (IS_ERR(tc->panel_bridge))
+		return PTR_ERR(tc->panel_bridge);
+
+	ret = tc358775_parse_dt(dev->of_node, tc);
+	if (ret)
+		return ret;
+
+	tc->vddio = devm_regulator_get(dev, "vddio-supply");
+	if (IS_ERR(tc->vddio)) {
+		ret = PTR_ERR(tc->vddio);
+		dev_err(dev, "vddio-supply not found\n");
+		return ret;
+	}
+
+	tc->vdd = devm_regulator_get(dev, "vdd-supply");
+	if (IS_ERR(tc->vdd)) {
+		ret = PTR_ERR(tc->vddio);
+		dev_err(dev, "vdd-supply not found\n");
+		return ret;
+	}
+
+	tc->stby_gpio = devm_gpiod_get(dev, "stby", GPIOD_OUT_HIGH);
+	if (IS_ERR(tc->stby_gpio)) {
+		ret = PTR_ERR(tc->stby_gpio);
+		dev_err(dev, "cannot get stby-gpio %d\n", ret);
+		return ret;
+	}
+
+	tc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(tc->reset_gpio)) {
+		ret = PTR_ERR(tc->reset_gpio);
+		dev_err(dev, "cannot get reset-gpios %d\n", ret);
+		return ret;
+	}
+
+	tc->bridge.funcs = &tc_bridge_funcs;
+	tc->bridge.of_node = dev->of_node;
+	drm_bridge_add(&tc->bridge);
+
+	i2c_set_clientdata(client, tc);
+
+	return 0;
+}
+
+static int tc_remove(struct i2c_client *client)
+{
+	struct tc_data *tc = i2c_get_clientdata(client);
+
+	drm_bridge_remove(&tc->bridge);
+
+	return 0;
+}
+
+static const struct i2c_device_id tc358775_i2c_ids[] = {
+	{ "tc358775", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tc358775_i2c_ids);
+
+static const struct of_device_id tc358775_of_ids[] = {
+	{ .compatible = "toshiba,tc358775", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, tc358775_of_ids);
+
+static struct i2c_driver tc358775_driver = {
+	.driver = {
+		.name = "tc358775",
+		.of_match_table = tc358775_of_ids,
+	},
+	.id_table = tc358775_i2c_ids,
+	.probe = tc_probe,
+	.remove	= tc_remove,
+};
+module_i2c_driver(tc358775_driver);
+
+MODULE_AUTHOR("Vinay Simha BN <simhavcs@gmail.com>");
+MODULE_DESCRIPTION("TC358775 DSI/LVDS bridge driver");
+MODULE_LICENSE("GPL v2");
-- 
2.1.2