Re: [PATCH v4] display/drm/bridge: TC358775 DSI/LVDS driver

From: Vinay Simha B N
Date: Mon Jun 29 2020 - 16:46:52 EST

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In reply to: Neil Armstrong: "Re: [PATCH v4] display/drm/bridge: TC358775 DSI/LVDS driver"
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Neil,

yaml is the v3 version, there was no change , so i had not created v4 for yaml
[PATCH v3 2/2] display/drm/bridge: TC358775 DSI/LVDS driver

On Mon, Jun 29, 2020 at 2:08 PM Neil Armstrong <narmstrong@xxxxxxxxxxxx> wrote:
>
> Hi,
>
> On 21/06/2020 17:38, Vinay Simha BN wrote:
> > Signed-off-by: Vinay Simha BN <simhavcs@xxxxxxxxx>
> >
> > ---
> > 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@xxxxxxxxx>
> > parse_dt to static function
> > removed the if (endpoint), since data-lanes has to be
> > present for dsi dts ports
>
> I maybe missed something, but you should also post a YAML DT bindings
> file associated to the driver.
>
> Neil
>
>
> > ---
> > 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@xxxxxxxxx>
> > + *
> > + */
> > +//#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@xxxxxxxxx>");
> > +MODULE_DESCRIPTION("TC358775 DSI/LVDS bridge driver");
> > +MODULE_LICENSE("GPL v2");
> >
>

--
regards,
vinaysimha

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