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Subject: Re: [PATCH v4] display/drm/bridge: TC358775 DSI/LVDS driver
To:     Vinay Simha B N <simhavcs@gmail.com>
Cc:     Andrzej Hajda <a.hajda@samsung.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>,
        open list <linux-kernel@vger.kernel.org>,
        "open list:DRM DRIVERS" <dri-devel@lists.freedesktop.org>
References: <20200621153812.30531-1-simhavcs@gmail.com>
 <d4e67b80-e50f-7b3d-760c-4cefdeff84c7@baylibre.com>
 <CAGWqDJ5Kou2xfRr9_FdjBA1K8VyO0O5trF6dLAGVSZ6V_0V6zg@mail.gmail.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Organization: Baylibre
Message-ID: <3f9925b8-89b8-6580-dfa7-8a1ba0034b40@baylibre.com>
Date:   Tue, 30 Jun 2020 09:27:06 +0200
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Hi,

On 29/06/2020 10:47, Vinay Simha B N wrote:
> 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
> 

OK, please resend the whole patchset even with unchanged patches, you can explain
which patches were not changed on the cover letter.

Neil

> 
> On Mon, Jun 29, 2020 at 2:08 PM Neil Armstrong <narmstrong@baylibre.com> wrote:
>>
>> Hi,
>>
>> On 21/06/2020 17:38, Vinay Simha BN wrote:
>>> 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
>>
>> 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@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");
>>>
>>
> 
>