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 --- drivers/gpu/drm/bridge/Kconfig | 10 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/tc358775.c | 721 ++++++++++++++++++++++++++++++ 3 files changed, 732 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 43271c21d3fc..084e9853944a 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 LVDS bridge" + depends on OF + select DRM_KMS_HELPER + select REGMAP_I2C + select DRM_PANEL + select DRM_MIPI_DSI + ---help--- + Toshiba TC358775 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 d63d4b7e4347..23c770b3bfe4 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 000000000000..8c9bd4e77bfd --- /dev/null +++ b/drivers/gpu/drm/bridge/tc358775.c @@ -0,0 +1,721 @@ +// 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/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 <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_MASK(start, end) (((1 << ((start) - (end) + 1)) - 1) << (end)) +#define FLD_VAL(val, start, end) (((val) << (end)) & FLD_MASK(start, end)) + +/* 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 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; + bool dual_link; /* single-link or dual-link */ +}; + +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; + + ret = regulator_disable(tc->vddio); + if (ret < 0) + dev_err(dev, "regulator vddio disable failed, %d\n", ret); + 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); + + gpiod_set_value(tc->stby_gpio, 1); + usleep_range(10000, 11000); + + gpiod_set_value(tc->reset_gpio, 1); + usleep_range(10, 20); +} + +static u32 d2l_read(struct i2c_client *i2c, u16 reg) +{ + int ret; + u8 val[4]; + u8 addr[] = {(reg >> 8) & 0xff, reg & 0xff}; + u32 value; + + ret = i2c_master_send(i2c, addr, sizeof(reg)); + if (ret < 0) + goto fail; + + ret = i2c_master_recv(i2c, val, sizeof(value)); + if (ret < 0) + goto fail; + + value = val[3] << 24 | val[2] << 16 | val[1] << 8 | val[0]; + + pr_debug("d2l: I2C : reg:%04x value:%08x\n", reg, value); + + return value; + +fail: + dev_err(&i2c->dev, "Error %d reading from subaddress 0x%x\n", + ret, reg); + return 0; +} + +static void d2l_write(struct i2c_client *i2c, u16 reg, u32 val) +{ + u8 buf[6]; + int ret; + + buf[0] = reg >> 8; + buf[1] = reg & 0xFF; + buf[2] = (val >> 0) & 0xFF; + buf[3] = (val >> 8) & 0xFF; + buf[4] = (val >> 16) & 0xFF; + buf[5] = (val >> 24) & 0xFF; + + ret = i2c_master_send(i2c, buf, ARRAY_SIZE(buf)); + if (ret < 0) + dev_err(&i2c->dev, "Error %d writing to subaddress 0x%x\n", + ret, reg); +} + +/* 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 hbpr, hpw, htime1, hfpr, hsize, htime2; + u32 vbpr, vpw, vtime1, vfpr, vsize, vtime2; + u32 val = 0; + u16 bus_formats; + struct drm_display_mode *mode; + struct drm_connector *connector = get_connector(bridge->encoder); + + mode = &bridge->encoder->crtc->state->adjusted_mode; + + hbpr = mode->htotal - mode->hsync_end; + hpw = mode->hsync_end - mode->hsync_start; + vbpr = mode->vtotal - mode->vsync_end; + vpw = mode->vsync_end - mode->vsync_start; + + htime1 = (hbpr << 16) + hpw; + vtime1 = (vbpr << 16) + vpw; + + hfpr = mode->hsync_start - mode->hdisplay; + hsize = mode->hdisplay; + vfpr = mode->vsync_start - mode->vdisplay; + vsize = mode->vdisplay; + + htime2 = (hfpr << 16) + hsize; + vtime2 = (vfpr << 16) + vsize; + + val = d2l_read(tc->i2c, IDREG); + + 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); + + val = TC358775_VPCTRL_VSDELAY(21); + + bus_formats = connector->display_info.bus_formats[0]; + dev_dbg(tc->dev, "bus_formats : %04x\n", bus_formats); + + if (bus_formats == MEDIA_BUS_FMT_RGB888_1X7X4_SPWG || + bus_formats == MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA) { + /* RGB888 */ + val |= TC358775_VPCTRL_OPXLFMT(1); + d2l_write(tc->i2c, VPCTRL, val); + } else { + /* RGB666 */ + val |= TC358775_VPCTRL_MSF(1); + 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)); + + /* default jeida-24 */ + if (bus_formats == 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)); + } + + if (bus_formats == 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->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 int tc_mode_valid(struct drm_bridge *bridge, + const struct drm_display_mode *mode) +{ + struct tc_data *tc = bridge_to_tc(bridge); + + /* Maximum pixel clock speed 135MHz-single-link/270MHz-dual-link */ + if ((mode->clock > 135000 && tc->dual_link) || + (mode->clock > 270000 && tc->dual_link)) + return MODE_CLOCK_HIGH; + + 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; + + 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); + 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); + + 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->dual_link = true; + of_node_put(remote); + } + } + + dev_dbg(tc->dev, "no.of dsi lanes: %d\n", tc->num_dsi_lanes); + dev_dbg(tc->dev, "operating in %s-link mode\n", + tc->dual_link ? "dual" : "single"); + + 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");