Re: [PATCH] display/bridge: dsi2lvds tc358775 driver

On 27.02.2020 15:03, Vinay Simha BN wrote:

dsi2lvds tc358775 bridge driver added Tested in apq8016, ifc6309 board and panel auo,b101xtn01

Just FYI, there exists already TC358764/5 driver for similar hw, but controlled via DSI bus.

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

.../bindings/display/bridge/toshiba,tc358775.txt | 106 ++++

Bindings should be in separate patch and in yaml format.

drivers/gpu/drm/bridge/Kconfig | 10 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/tc358775.c | 687 +++++++++++++++++++++ 4 files changed, 804 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt create mode 100644 drivers/gpu/drm/bridge/tc358775.c

diff --git a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt new file mode 100644 index 0000000..c4c364d --- /dev/null +++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt @@ -0,0 +1,106 @@ +Toshiba TC358775 DSI to LVDS bridge bindings

+Required properties:

• • compatible: "toshiba,tc358775"
• • reg: i2c address of the bridge, 0x0f
• • tc, dsi-lanes: Number of DSI data lanes connected to the DSI host. It should
• be one of 1, 2, 3 or 4.
• • tc, dual-link : To configure the LVDS transmitter either
• as single-link or dual-link.
• • tc, data-format: To configure the data formats
• 0 for VESA standard, 1 for JEIDA standard

IMO, three properties above should be received from downstream device in runtime, not hardcoded into DT, however I am not sure if frameworks support it.

• • vdd-supply: 1.2V LVDS Power Supply
• • vddio-supply: 1.8V IO Power Supply
• • stby-gpios: Standby pin, Low active
• • reset-gpios: Hardware reset, Low active

+Required nodes:

+The TC358775 has two ports. Their connections are modelled using the OF +graph bindings specified in Documentation/devicetree/bindings/graph.txt.

+- Video port 0 for the DSI input. The remote endpoint phandle should be a

• reference to a valid mipi_dsi_host device node.

+- Video port 1 for the LVDS output.

+Example:

• i2c@78b8000 {

• /* On High speed expansion */
  

• label = "HS-I2C2";
  

• status = "okay";
  

• tc_bridge: bridge@f {
  

• 	status = "okay";
  

• 	compatible = "toshiba,tc358775";
  

• 	reg = <0x0f>;
  

• 	tc,dsi-lanes = <4>;
  

• 	tc,dual-link = <0>;
  

• 	tc,data-format = <1>;
  

• 	vdd-supply = <&pm8916_l2>;
  

• 	vddio-supply = <&pm8916_l6>;
  

• 	stby-gpio = <&msmgpio 99 GPIO_ACTIVE_LOW>;
  

• 	reset-gpio = <&msmgpio 72 GPIO_ACTIVE_LOW>;
  

• 	ports {
  

• 		#address-cells = <1>;
  

• 		#size-cells = <0>;
  

• 		port@0 {
  

• 			reg = <0>;
  

• 			d2l_in: endpoint {
  

• 				remote-endpoint = <&dsi0_out>;
  

• 			};
  

• 		};
  

• 		port@1 {
  

• 			reg = <1>;
  

• 			d2l_out: endpoint {
  

• 				remote-endpoint = <&panel_in>;
  

• 			};
  

• 		};
  

• 	};
  

• };
  

• };
• panel: auo,b101xtn01 {

• 	status = "okay";
  

• 	compatible = "auo,b101xtn01";
  

• 	power-supply = <&pm8916_l14>;
  

• 	port {
  

• 		panel_in: endpoint {
  

• 			remote-endpoint = <&d2l_out>;
  

• 		};
  

• 	};
  

• };
• mdss@1a00000 {

• status = "okay";
  

• mdp@1a01000 {
  

• 	status = "okay";
  

• };
  

• dsi@1a98000 {
  

• 	status = "okay";
  

• 	..
  

• 	ports {
  

• 		port@1 {
  

• 			dsi0_out: endpoint {
  

• 				remote-endpoint = <&d2l_in>;
  

• 				data-lanes = <0 1 2 3>;
  

• 			};
  

• 		};
  

• 	};
  

• };
  

• dsi-phy@1a98300 {
  

• 	status = "okay";
  

• 	..
  

• };
  

• };

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index 8397bf7..d5528fa 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -133,6 +133,16 @@ config DRM_TOSHIBA_TC358767 ---help--- Toshiba TC358767 eDP 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 1eb5376..9b2c512 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_SII9234) += sii9234.o obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o +obj-$(CONFIG_DRM_TOSHIBA_TC358775) += tc358775.o obj-$(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..3db0f49 --- /dev/null +++ b/drivers/gpu/drm/bridge/tc358775.c @@ -0,0 +1,687 @@ +// SPDX-License-Identifier: GPL-2.0 +/*

• • tc358775 DSI to LVDS bridge driver
• • Copyright (C) 2020 InforceComputing
• • Author: Vinay Simha BN vinaysimha@inforcecomputing.com
• • This program is free software; you can redistribute it and/or modify
• • it under the terms of the GNU General Public License as published by
• • the Free Software Foundation; either version 2 of the License, or
• • (at your option) any later version.
• • This program is distributed in the hope that it will be useful,
• • but WITHOUT ANY WARRANTY; without even the implied warranty of
• • MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
• • GNU General Public License for more details.

You can drop these statements, SPDX identifier is enough.

• */

+/* #define DEBUG */ +/* #define TC358775_DEBUG */

Please remove these development leftovers.

+#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/regmap.h> +#include <linux/slab.h> +#include <linux/regulator/consumer.h>

Alphabetic order.

+#include <drm/drm_mipi_dsi.h> +#include <drm/drm_atomic_helper.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_dp_helper.h> +#include <drm/drm_of.h> +#include <drm/drm_panel.h> +#include <drm/drm_bridge.h> +#include <drm/drm_probe_helper.h>

ditto

+/* 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_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

+#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_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 */

+/* Mux Input Select for LVDS LINK Input */ +#define LVMX0003 0x0480 /* Bit 0 to 3 */ +#define LVMX0407 0x0484 /* Bit 4 to 7 */ +#define LVMX0811 0x0488 /* Bit 8 to 11 */ +#define LVMX1215 0x048C /* Bit 12 to 15 */ +#define LVMX1619 0x0490 /* Bit 16 to 19 */ +#define LVMX2023 0x0494 /* Bit 20 to 23 */ +#define LVMX2427 0x0498 /* Bit 24 to 27 */

+#define LVCFG 0x049C /* LVDS Configuration */ +#define LVPHY0 0x04A0 /* LVDS PHY 0 */ +#define LVPHY1 0x04A4 /* LVDS PHY 1 */ +#define SYSSTAT 0x0500 /* System Status */ +#define SYSRST 0x0504 /* System Reset */ +/* 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 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 LVCFG_LVEN_BIT BIT(0)

+#define L0EN BIT(1)

+#define TC358775_VPCTRL_VSDELAY__MASK 0x3FF00000 +#define TC358775_VPCTRL_VSDELAY__SHIFT 20 +static inline uint32_t TC358775_VPCTRL_VSDELAY(uint32_t val)

Use u32 here and below, unit32_t is mainly for userspace interactions.

+{

• return ((val) << TC358775_VPCTRL_VSDELAY__SHIFT) &

• 	TC358775_VPCTRL_VSDELAY__MASK;
  

+}

+#define TC358775_VPCTRL_OPXLFMT__MASK 0x00000100 +#define TC358775_VPCTRL_OPXLFMT__SHIFT 8 +static inline uint32_t 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 uint32_t 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 uint32_t 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 uint32_t TC358775_LVCFG_LVDLINK(uint32_t val) +{

• return ((val) << TC358775_LVCFG_LVDLINK__SHIFT) &

• 	TC358775_LVCFG_LVDLINK__MASK;
  

+}

+static const struct reg_sequence tc_fixed_registers[] = {

• { 0x013C, 0x00040006 },
• { 0x0114, 0x00000004 },
• { 0x0164, 0x00000003 },
• { 0x0168, 0x00000003 },
• { 0x016C, 0x00000003 },
• { 0x0170, 0x00000003 },

use macros instead of magic numbers.

+};

+static const struct reg_sequence tc_vesa_data_format_registers[] = {

• { 0x0480, 0x03020100 },
• { 0x0484, 0x08050704 },
• { 0x0488, 0x0F0E0A09 },
• { 0x048C, 0x100D0C0B },
• { 0x0490, 0x12111716 },
• { 0x0494, 0x1B151413 },
• { 0x0498, 0x061A1918 },

ditto

+};

+static const char * const regulator_names[] = {

• "vdd",
• "vddio"

+};

+struct tc_data {

• struct i2c_client *i2c;
• struct device *dev;
• struct regmap *regmap;
• struct drm_bridge bridge;
• struct drm_connector connector;
• struct drm_panel *panel;
• enum drm_connector_status status;

unused field

• struct device_node *host_node;
• struct mipi_dsi_device *dsi;
• u8 num_dsi_lanes;
• struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
• struct gpio_desc *reset_gpio;
• struct gpio_desc *stby_gpio;
• u32 rev;
• u8 dual_link; /* single-link or dual-link */
• u8 data_format; /* VESA or JEIDA */

+};

+static inline struct tc_data *bridge_to_tc(struct drm_bridge *b) +{

• return container_of(b, struct tc_data, bridge);

+}

+static inline struct tc_data *connector_to_tc(struct drm_connector *c) +{

• return container_of(c, struct tc_data, connector);

+}

+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_bulk_enable(ARRAY_SIZE(tc->supplies), tc->supplies);
• if (ret < 0) {

• dev_err(dev, "regulator enable failed, %d\n", ret);
  

• return;
  

• }
• mdelay(10);
• gpiod_set_value(tc->stby_gpio, 0);
• mdelay(10);
• gpiod_set_value(tc->reset_gpio, 0);
• ndelay(50);
• drm_panel_prepare(tc->panel);

+}

+static void tc_bridge_disable(struct drm_bridge *bridge) +{

• struct tc_data *tc = bridge_to_tc(bridge);
• struct device *dev = &tc->dsi->dev;
• int ret;
• ret = regulator_bulk_disable(ARRAY_SIZE(tc->supplies), tc->supplies);
• if (ret < 0)

• dev_err(dev, "regulator disable failed, %d\n", ret);
  

• mdelay(10);
• gpiod_set_value(tc->stby_gpio, 1);
• mdelay(10);
• gpiod_set_value(tc->reset_gpio, 1);
• ndelay(50);
• drm_panel_disable(tc->panel);

I suspect the order should be different - ie reverse to the one pre_enable.

Moreover since it reverts pre_enable it should be put into post_disable (except drm_panel_disable).

+}

+static void tc_bridge_post_disable(struct drm_bridge *bridge) +{

• struct tc_data *tc = bridge_to_tc(bridge);
• drm_panel_unprepare(tc->panel);

+}

+#ifdef TC358775_DEBUG +static u32 d2l_read(struct tc_data *tc, u16 reg) +{

• int ret;
• u32 data;
• ret = regmap_bulk_read(tc->regmap, reg, &data, 1);
• if (ret)

• return ret;
  

• pr_debug("d2l: I2C : reg:%04x value:%08x\n", reg, data);
• return data;

+} +#endif

I guess this leftover can be removed as well.

+static int d2l_write(struct tc_data *tc, u16 reg, u32 data) +{

• int ret = 0;
• ret = regmap_bulk_write(tc->regmap, reg, (u32[]) {data}, 1);

+#ifdef TC358775_DEBUG

• d2l_read(tc, reg);

+#endif

• return ret;

+}

+static void tc_bridge_enable(struct drm_bridge *bridge) +{

• struct tc_data *tc = bridge_to_tc(bridge);
• int ret;
• u32 hbpr, hpw, htime1, hfpr, hsize, htime2;
• u32 vbpr, vpw, vtime1, vfpr, vsize, vtime2;
• u32 val = 0;
• struct drm_display_mode *mode;
• mode = &bridge->encoder->crtc->state->adjusted_mode;
• hbpr = 0;
• hpw = mode->hsync_end - mode->hsync_start;
• vbpr = 0;
• 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;
• ret = regmap_read(tc->regmap, IDREG, &tc->rev);
• if (ret) {

• dev_err(tc->dev, "can not read device ID: %d\n", ret);
  

• return;
  

• }
• pr_debug("tc IDREG %04x Rev. %08x\n", IDREG, tc->rev);
• d2l_write(tc, SYSRST, 0x000000FF);
• mdelay(30);
• ret = regmap_register_patch(tc->regmap,

• 		    tc_fixed_registers,
  

• 		    ARRAY_SIZE(tc_fixed_registers));
  

• if (ret)

• return;
  

• val = ((L0EN << tc->num_dsi_lanes) - L0EN) | DSI_CLEN_BIT;
• d2l_write(tc, PPI_LANEENABLE, val);
• d2l_write(tc, DSI_LANEENABLE, val);
• d2l_write(tc, PPI_STARTPPI, 0x00000001);
• d2l_write(tc, DSI_STARTDSI, 0x00000001);
• val = TC358775_VPCTRL_VSDELAY(21); //TODO : to set the dynamic value
• if (tc->connector.display_info.bpc == 8) {/* RGB888 */

• val |= TC358775_VPCTRL_OPXLFMT(1);
  

• d2l_write(tc, VPCTRL, val);
  

• } else { /* RGB666 */

• val |= TC358775_VPCTRL_MSF(1);
  

• d2l_write(tc, VPCTRL, val);
  

• }
• d2l_write(tc, HTIM1, htime1);
• d2l_write(tc, VTIM1, vtime1);
• d2l_write(tc, HTIM2, htime2);
• d2l_write(tc, VTIM2, vtime2);
• d2l_write(tc, VFUEN, 0x00000001);
• d2l_write(tc, SYSRST, 0x00000004);
• d2l_write(tc, LVPHY0, 0x00040006);
• if (tc->data_format) { /* Data Format VESA=0 , JEIDA=1 */

• ret = regmap_register_patch
  

• 	(tc->regmap,
  

• 	 tc_vesa_data_format_registers,
  

• 	 ARRAY_SIZE(tc_vesa_data_format_registers));
  

• if (ret)
  

• 	return;
  

• }
• d2l_write(tc, VFUEN, 0x00000001);
• val = TC358775_LVCFG_PCLKDIV(DIVIDE_BY_3) | LVCFG_LVEN_BIT;
• if (tc->dual_link)

• val |= TC358775_LVCFG_LVDLINK(1);
  

• d2l_write(tc, LVCFG, val);
• drm_panel_enable(tc->panel);

+}

+static int tc_connector_get_modes(struct drm_connector *connector) +{

• struct tc_data *tc = connector_to_tc(connector);
• struct edid *edid;
• unsigned int count;
• if (tc->panel && tc->panel->funcs && tc->panel->funcs->get_modes) {

• count = tc->panel->funcs->get_modes(tc->panel, connector);
  

• if (count > 0)
  

• 	return count;
  

• }
• edid = drm_get_edid(connector, tc->i2c->adapter);
• if (!edid)

• return 0;
  

• drm_connector_update_edid_property(connector, edid);
• count = drm_add_edid_modes(connector, edid);
• kfree(edid);
• return count;

+}

+static int tc_connector_mode_valid(struct drm_connector *connector,

• 		   struct drm_display_mode *mode)
  

+{

• struct tc_data *tc = connector_to_tc(connector);
• /* Maximum pixel clock speed 135MHz-single-link/270MHz-dual-link */
• if ((mode->clock > 135000 && tc->dual_link == 0) ||

•    (mode->clock > 270000 && tc->dual_link == 1))
  

• return MODE_CLOCK_HIGH;
  

• return MODE_OK;

+}

+static struct drm_encoder * +tc_connector_best_encoder(struct drm_connector *connector) +{

• struct tc_data *tc = connector_to_tc(connector);
• return tc->bridge.encoder;

+}

+static const struct drm_connector_helper_funcs tc_connector_helper_funcs = {

• .get_modes = tc_connector_get_modes,
• .mode_valid = tc_connector_mode_valid,
• .best_encoder = tc_connector_best_encoder,

+};

+static const struct drm_connector_funcs tc_connector_funcs = {

• .fill_modes = drm_helper_probe_single_connector_modes,
• .destroy = drm_connector_cleanup,
• .reset = drm_atomic_helper_connector_reset,
• .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
• .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,

+};

+int tc358775_parse_dt(struct device_node *np, struct tc_data *tc) +{

• u32 num_lanes;
• u8 dual_link, data_format;
• of_property_read_u8(np, "tc,dual-link", &dual_link);
• of_property_read_u8(np, "tc,data-format", &data_format);
• of_property_read_u32(np, "tc,dsi-lanes", &num_lanes);
• if (num_lanes < 1 || num_lanes > 4)

• return -EINVAL;
  

• tc->num_dsi_lanes = num_lanes;
• tc->dual_link = dual_link;
• tc->data_format = data_format;
• tc->host_node = of_graph_get_remote_node(np, 0, 0);
• if (!tc->host_node)

• return -ENODEV;
  

• of_node_put(tc->host_node);
• return 0;

+}

+int tc358775_attach_dsi(struct tc_data *tc) +{

• struct device *dev = &tc->i2c->dev;
• struct mipi_dsi_host *host;
• struct mipi_dsi_device *dsi;
• int ret = 0;
• 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;
  

• }
• return 0;

+err_dsi_attach:

• mipi_dsi_device_unregister(dsi);

+err_dsi_device:

• return ret;

+}

+static int tc_bridge_attach(struct drm_bridge *bridge) +{

• struct tc_data *tc = bridge_to_tc(bridge);
• struct drm_device *drm = bridge->dev;
• int ret;
• /* Create LVDS connector */
• drm_connector_helper_add(&tc->connector, &tc_connector_helper_funcs);
• ret = drm_connector_init(drm, &tc->connector, &tc_connector_funcs,

• 		 DRM_MODE_CONNECTOR_LVDS);
  

• if (ret)

• return ret;
  

• if (tc->panel)

• drm_panel_attach(tc->panel, &tc->connector);
  

• drm_connector_attach_encoder(&tc->connector, tc->bridge.encoder);
• ret = tc358775_attach_dsi(tc);

Ignored retval.

• return 0;

+}

+static const struct drm_bridge_funcs tc_bridge_funcs = {

• .attach = tc_bridge_attach,
• .pre_enable = tc_bridge_pre_enable,
• .enable = tc_bridge_enable,
• .disable = tc_bridge_disable,
• .post_disable = tc_bridge_post_disable,

+};

+static const struct regmap_config tc_regmap_config = {

• .name = "tc358775",
• .reg_bits = 16,
• .val_bits = 32,
• .reg_stride = 4,
• .max_register = 0x05A8,
• .cache_type = REGCACHE_RBTREE,
• .reg_format_endian = REGMAP_ENDIAN_BIG,
• .val_format_endian = REGMAP_ENDIAN_LITTLE,

+};

+static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id) +{

• struct device *dev = &client->dev;
• struct tc_data *tc;
• int ret;
• unsigned int i;
• tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL);
• if (!tc)

• return -ENOMEM;
  

• tc->dev = dev;
• tc->i2c = client;
• tc->status = connector_status_connected;
• /* port@1 is the output port */
• ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &tc->panel, NULL);
• if (ret && ret != -ENODEV)

• return ret;
  

• ret = tc358775_parse_dt(dev->of_node, tc);
• if (ret)

• return ret;
  

• for (i = 0; i < ARRAY_SIZE(tc->supplies); i++)

• tc->supplies[i].supply = regulator_names[i];
  

• ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tc->supplies),

• 		      tc->supplies);
  

• if (ret < 0)

• dev_err(dev, "failed to init regulator, ret=%d\n", 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->regmap = devm_regmap_init_i2c(client, &tc_regmap_config);
• if (IS_ERR(tc->regmap)) {

• ret = PTR_ERR(tc->regmap);
  

• dev_err(dev, "Failed to initialize regmap: %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 vinaysimha@inforcecomputing.com"); +MODULE_DESCRIPTION("tc358775 LVDS encoder driver");

maybe  better:

tc358775 DSI/LVDS bridge driver

Regards Andrzej

+MODULE_LICENSE("GPL v2");