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X-OriginatorOrg: topic.nl X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Aug 2025 05:32:15.6862 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 359172c8-d8b0-4f5d-835e-08dddee1c1f5 X-MS-Exchange-CrossTenant-Id: 449607a5-3517-482d-8d16-41dd868cbda3 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=449607a5-3517-482d-8d16-41dd868cbda3;Ip=[20.93.157.195];Helo=[westeu11-emailsignatures-cloud.codetwo.com] X-MS-Exchange-CrossTenant-AuthSource: DU6PEPF00009527.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: OSKPR04MB11463 Content-Type: text/plain; charset="utf-8" Add DT binding document for TI TMDS181 and SN65DP159 HDMI retimers. Signed-off-by: Mike Looijmans --- Changes in v2: Document driver specific bindings like slew-rate and threshold .../bindings/display/bridge/ti,tmds181.yaml | 143 ++++++++++++++++++ 1 file changed, 143 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/bridge/ti,tmd= s181.yaml diff --git a/Documentation/devicetree/bindings/display/bridge/ti,tmds181.ya= ml b/Documentation/devicetree/bindings/display/bridge/ti,tmds181.yaml new file mode 100644 index 000000000000..816bea54846f --- /dev/null +++ b/Documentation/devicetree/bindings/display/bridge/ti,tmds181.yaml @@ -0,0 +1,143 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/display/bridge/ti,tmds181.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: TMDS181 and SN65DP159 HDMI retimer/redriver chips + +maintainers: + - Mike Looijmans + +description: | + Texas Instruments TMDS181 and SN65DP159 retimer and redriver chips. + https://www.ti.com/product/TMDS181 + https://www.ti.com/product/TMDS181 + +properties: + compatible: + enum: + - ti,tmds181 + - ti,sn65dp159 + + reg: + enum: + - 0x5b + - 0x5c + - 0x5d + - 0x5e + + oe-gpios: + maxItems: 1 + description: GPIO specifier for OE pin (active high). + + ports: + $ref: /schemas/graph.yaml#/properties/ports + + properties: + port@0: + $ref: /schemas/graph.yaml#/$defs/port-base + unevaluatedProperties: false + description: Video port for HDMI (ish) input + + properties: + endpoint: + $ref: /schemas/media/video-interfaces.yaml# + unevaluatedProperties: false + + port@1: + $ref: /schemas/graph.yaml#/$defs/port-base + unevaluatedProperties: false + description: Video port for HDMI output (panel or bridge) + + properties: + endpoint: + $ref: /schemas/media/video-interfaces.yaml# + unevaluatedProperties: false + + required: + - port@0 + - port@1 + + ti,source-mode: + type: boolean + description: + Force chip to operate in "source" mode. Allows to use + a TMDS181 chip (which defaults to sink) as cable driver. + + ti,sink-mode: + type: boolean + description: + Force chip to operate in "sink" mode. Allows to use + a DP159 chip (defaults to source) for incoming signals. + + ti,retimer-threshold-hz: + minimum: 25000000 + maximum: 600000000 + default: 200000000 + description: + Cross-over point. Up until this pixel clock frequency + the chip remains in the low-power redriver mode. Above + the threshold the chip should operate in retimer mode. + + ti,dvi-mode: + type: boolean + description: Makes the DP159 chip operate in DVI mode. + + ti,slew-rate: + minimum: 0 + maximum: 3 + default: 3 + description: Set slew rate, 0 is slowest, 3 is fastest. + + ti,disable-equalizer: + type: boolean + description: Disable the equalizer (to save power). + + ti,adaptive-equalizer: + type: boolean + description: Set the equalizer to adaptive mode. + +required: + - compatible + - reg + - ports + +additionalProperties: false + +examples: + - | + #include + + i2c { + #address-cells =3D <1>; + #size-cells =3D <0>; + + bridge@5b { + compatible =3D "ti,sn65dp159"; + reg =3D <0x5b>; + + oe-gpios =3D <&gpio2 1 GPIO_ACTIVE_HIGH>; + + ports { + #address-cells =3D <1>; + #size-cells =3D <0>; + + port@0 { + reg =3D <0>; + + endpoint { + remote-endpoint =3D <&encoder_out>; + }; + }; + + port@1 { + reg =3D <1>; + + endpoint { + remote-endpoint =3D <&hdmi_connector_in>; + }; + }; + }; + }; + }; --=20 2.43.0 Met vriendelijke groet / kind regards, Mike Looijmans System Expert TOPIC Embedded Products B.V. 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X-OriginatorOrg: topic.nl X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Aug 2025 05:32:17.8361 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bdbf76fe-485f-4144-a5ac-08dddee1c31a X-MS-Exchange-CrossTenant-Id: 449607a5-3517-482d-8d16-41dd868cbda3 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=449607a5-3517-482d-8d16-41dd868cbda3;Ip=[20.93.157.195];Helo=[westeu11-emailsignatures-cloud.codetwo.com] X-MS-Exchange-CrossTenant-AuthSource: AMS1EPF00000042.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PA1PR04MB10358 Content-Type: text/plain; charset="utf-8" The tmds181 and sn65dp159 are "retimers" and hence can be considered HDMI-to-HDMI bridges. Typical usage is to convert the output of an FPGA into a valid HDMI signal, and it will typically be inserted between an encoder and hdmi-connector. Signed-off-by: Mike Looijmans --- Changes in v2: Use atomic_enable/disable Use #defines for bit fields in registers Allow HDMI 2 compliance Filter modes on clock range Use cross-over pixel frequency instead of manual overides Devicetree bindings according to standards drivers/gpu/drm/bridge/Kconfig | 11 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/ti-tmds181.c | 561 ++++++++++++++++++++++++++++ 3 files changed, 573 insertions(+) create mode 100644 drivers/gpu/drm/bridge/ti-tmds181.c diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index b9e0ca85226a..753177fc9b50 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -430,6 +430,17 @@ config DRM_TI_SN65DSI86 help Texas Instruments SN65DSI86 DSI to eDP Bridge driver =20 +config DRM_TI_TMDS181 + tristate "TI TMDS181 and SN65DP159 HDMI retimer bridge driver" + depends on OF + select DRM_KMS_HELPER + select REGMAP_I2C + help + Enable this to support the TI TMDS181 and SN65DP159 HDMI retimers. + The SN65DP159 provides output into a cable (source) whereas the + TMDS181 is meant to forward a cable signal into a PCB (sink). Either + can be set up as source or sink though. + config DRM_TI_TPD12S015 tristate "TI TPD12S015 HDMI level shifter and ESD protection" depends on OF diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makef= ile index 245e8a27e3fc..f4b5089e903c 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -39,6 +39,7 @@ obj-$(CONFIG_DRM_TI_SN65DSI83) +=3D ti-sn65dsi83.o obj-$(CONFIG_DRM_TI_SN65DSI86) +=3D ti-sn65dsi86.o obj-$(CONFIG_DRM_TI_TDP158) +=3D ti-tdp158.o obj-$(CONFIG_DRM_TI_TFP410) +=3D ti-tfp410.o +obj-$(CONFIG_DRM_TI_TMDS181) +=3D ti-tmds181.o obj-$(CONFIG_DRM_TI_TPD12S015) +=3D ti-tpd12s015.o obj-$(CONFIG_DRM_NWL_MIPI_DSI) +=3D nwl-dsi.o obj-$(CONFIG_DRM_ITE_IT66121) +=3D ite-it66121.o diff --git a/drivers/gpu/drm/bridge/ti-tmds181.c b/drivers/gpu/drm/bridge/t= i-tmds181.c new file mode 100644 index 000000000000..34cbdb066820 --- /dev/null +++ b/drivers/gpu/drm/bridge/ti-tmds181.c @@ -0,0 +1,561 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * TI tmds181 and sn65dp159 HDMI redriver and retimer chips + * + * Copyright (C) 2018 - 2025 Topic Embedded Products + * + * based on code + * Copyright (C) 2007 Hans Verkuil + * Copyright (C) 2016, 2017 Leon Woestenberg + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +MODULE_DESCRIPTION("I2C device driver for DP159 and TMDS181 redriver/retim= er"); +MODULE_AUTHOR("Mike Looijmans"); +MODULE_LICENSE("GPL"); + +#define TMDS181_REG_ID 0 +#define TMDS181_REG_REV 0x8 +#define TMDS181_REG_CTRL9 0x9 +/* Registers A and B have a volatile bit, but we don't use it, so cache is= ok */ +#define TMDS181_REG_CTRLA 0xA +#define TMDS181_REG_CTRLB 0xB +#define TMDS181_REG_CTRLC 0xC +#define TMDS181_REG_EQUALIZER 0xD +#define TMDS181_REG_EYESCAN 0xE + +#define TMDS181_CTRL9_SIG_EN BIT(4) +#define TMDS181_CTRL9_PD_EN BIT(3) +#define TMDS181_CTRL9_HPD_AUTO_PWRDWN_DISABLE BIT(2) +#define TMDS181_CTRL9_I2C_DR_CTL GENMASK(1, 0) + +#define TMDS181_CTRLA_MODE_SINK BIT(7) +#define TMDS181_CTRLA_HPDSNK_GATE_EN BIT(6) +#define TMDS181_CTRLA_EQ_ADA_EN BIT(5) +#define TMDS181_CTRLA_EQ_EN BIT(4) +#define TMDS181_CTRLA_AUX_BRG_EN BIT(3) +#define TMDS181_CTRLA_APPLY BIT(2) +#define TMDS181_CTRLA_DEV_FUNC_MODE GENMASK(1, 0) + +#define TMDS181_CTRLB_SLEW_CTL GENMASK(7, 6) +#define TMDS181_CTRLB_HDMI_SEL_DVI BIT(5) +#define TMDS181_CTRLB_TX_TERM_CTL GENMASK(4, 3) +#define TMDS181_CTRLB_DDC_DR_SEL BIT(2) +#define TMDS181_CTRLB_TMDS_CLOCK_RATIO_STATUS BIT(1) +#define TMDS181_CTRLB_DDC_TRAIN_SET BIT(0) + +#define TMDS181_CTRLB_TX_TERM_150_300_OHMS 1 +#define TMDS181_CTRLB_TX_TERM_75_150_OHMS 3 + +#define TMDS181_CTRLC_VSWING_DATA GENMASK(7, 5) +#define TMDS181_CTRLC_VSWING_CLK GENMASK(4, 2) +#define TMDS181_CTRLC_HDMI_TWPST1 GENMASK(1, 0) + +#define TMDS181_EQ_DATA_LANE GENMASK(5, 3) +#define TMDS181_EQ_CLOCK_LANE GENMASK(2, 1) +#define TMDS181_EQ_DIS_HDMI2_SWG BIT(0) + +/* Above this data rate HDMI2 standards apply (TX termination) */ +#define HDMI2_PIXEL_RATE_KHZ 340000 + +enum tmds181_chip { + tmds181, + dp159, +}; + +struct tmds181_data { + struct i2c_client *client; + struct regmap *regmap; + struct drm_bridge *next_bridge; + struct drm_bridge bridge; + u32 retimer_threshold_khz; + enum tmds181_chip chip; +}; + +static inline struct tmds181_data * +drm_bridge_to_tmds181_data(struct drm_bridge *bridge) +{ + return container_of(bridge, struct tmds181_data, bridge); +} + +/* Set "apply" bit in control register after making changes */ +static int tmds181_apply_changes(struct tmds181_data *data) +{ + return regmap_write_bits(data->regmap, TMDS181_REG_CTRLA, + TMDS181_CTRLA_APPLY, TMDS181_CTRLA_APPLY); +} + +static int tmds181_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct tmds181_data *data =3D drm_bridge_to_tmds181_data(bridge); + + return drm_bridge_attach(bridge->encoder, data->next_bridge, bridge, + flags); +} + +static enum drm_mode_status +tmds181_mode_valid(struct drm_bridge *bridge, const struct drm_display_inf= o *info, + const struct drm_display_mode *mode) +{ + /* Clock limits: clk between 25 and 350 MHz, clk is 1/10 of bit clock */ + if (mode->clock < 25000) + return MODE_CLOCK_LOW; + + /* The actual HDMI clock (if provided) cannot exceed 350MHz */ + if (mode->crtc_clock > 350000) + return MODE_CLOCK_HIGH; + + /* + * When in HDMI 2 mode, the clock is 1/40th of the bitrate. The limit is + * then the data rate of 6Gbps, which would use a 600MHz pixel clock. + */ + if (mode->clock > 600000) + return MODE_CLOCK_HIGH; + + return MODE_OK; +} + +static void tmds181_enable(struct drm_bridge *bridge, struct drm_bridge_st= ate *old_bridge_state) +{ + struct tmds181_data *data =3D drm_bridge_to_tmds181_data(bridge); + struct drm_atomic_state *state =3D old_bridge_state->base.state; + const struct drm_bridge_state *bridge_state; + const struct drm_crtc_state *crtc_state; + const struct drm_display_mode *mode; + struct drm_connector *connector; + struct drm_crtc *crtc; + unsigned int val; + + /* + * Retrieve the CRTC adjusted mode. This requires a little dance to go + * from the bridge to the encoder, to the connector and to the CRTC. + */ + connector =3D drm_atomic_get_new_connector_for_encoder(state, + bridge->encoder); + crtc =3D drm_atomic_get_new_connector_state(state, connector)->crtc; + crtc_state =3D drm_atomic_get_new_crtc_state(state, crtc); + mode =3D &crtc_state->adjusted_mode; + + /* Set retimer/redriver mode based on pixel clock */ + val =3D mode->clock > data->retimer_threshold_khz ? TMDS181_CTRLA_DEV_FUN= C_MODE : 0; + regmap_update_bits(data->regmap, TMDS181_REG_CTRLA, + TMDS181_CTRLA_DEV_FUNC_MODE, val); + + /* Configure TX termination based on pixel clock */ + val =3D mode->clock > HDMI2_PIXEL_RATE_KHZ ? + TMDS181_CTRLB_TX_TERM_75_150_OHMS : + TMDS181_CTRLB_TX_TERM_150_300_OHMS; + regmap_update_bits(data->regmap, TMDS181_REG_CTRLB, + TMDS181_CTRLB_TX_TERM_CTL, + FIELD_PREP(TMDS181_CTRLB_TX_TERM_CTL, val)); + + regmap_update_bits(data->regmap, TMDS181_REG_CTRL9, + TMDS181_CTRL9_PD_EN, 0); +} + +static void tmds181_disable(struct drm_bridge *bridge, struct drm_bridge_s= tate *old_bridge_state) +{ + struct tmds181_data *data =3D drm_bridge_to_tmds181_data(bridge); + + /* Set the PD_EN bit */ + regmap_update_bits(data->regmap, TMDS181_REG_CTRL9, + TMDS181_CTRL9_PD_EN, TMDS181_CTRL9_PD_EN); +} + +static const struct drm_bridge_funcs tmds181_bridge_funcs =3D { + .attach =3D tmds181_attach, + .mode_valid =3D tmds181_mode_valid, + .atomic_enable =3D tmds181_enable, + .atomic_disable =3D tmds181_disable, + + .atomic_reset =3D drm_atomic_helper_bridge_reset, + .atomic_duplicate_state =3D drm_atomic_helper_bridge_duplicate_state, + .atomic_destroy_state =3D drm_atomic_helper_bridge_destroy_state, +}; + +static const char * const tmds181_modes[] =3D { + "redriver", + "auto1", + "auto2", + "retimer", +}; + +static ssize_t mode_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct tmds181_data *data =3D dev_get_drvdata(dev); + const char *equalizer; + u32 val; + int ret; + + ret =3D regmap_read(data->regmap, TMDS181_REG_CTRLA, &val); + if (ret < 0) + return ret; + + if (val & BIT(4)) { + if (val & BIT(5)) + equalizer =3D "eq-adaptive"; + else + equalizer =3D "eq-fixed"; + } else { + equalizer =3D "eq-disabled"; + } + + return scnprintf(buf, PAGE_SIZE, "%6s %s %s\n", + (val & BIT(7)) ? "sink" : "source", + tmds181_modes[val & 0x03], + equalizer); +} + +static ssize_t mode_store(struct device *dev, struct device_attribute *att= r, + const char *buf, size_t len) +{ + struct tmds181_data *data =3D dev_get_drvdata(dev); + u32 val; + int ret; + int i; + + /* Strip trailing newline(s) for being user friendly */ + while (len && buf[len] =3D=3D '\n') + --len; + + /* Need at least 4 actual characters */ + if (len < 4) + return -EINVAL; + + ret =3D regmap_read(data->regmap, TMDS181_REG_CTRLA, &val); + if (ret < 0) + return ret; + + for (i =3D 0; i < ARRAY_SIZE(tmds181_modes); ++i) { + if (strncmp(tmds181_modes[i], buf, len) =3D=3D 0) { + val &=3D ~TMDS181_CTRLA_DEV_FUNC_MODE; + val |=3D FIELD_PREP(TMDS181_CTRLA_DEV_FUNC_MODE, i); + break; + } + } + + if (strncmp("sink", buf, len) =3D=3D 0) + val |=3D TMDS181_CTRLA_MODE_SINK; + + if (strncmp("source", buf, len) =3D=3D 0) + val &=3D ~TMDS181_CTRLA_MODE_SINK; + + if (strncmp("eq-", buf, 3) =3D=3D 0) { + switch (buf[3]) { + case 'a': /* adaptive */ + val |=3D TMDS181_CTRLA_EQ_ADA_EN | TMDS181_CTRLA_EQ_EN; + break; + case 'f': /* fixed */ + val |=3D TMDS181_CTRLA_EQ_EN; + val &=3D ~TMDS181_CTRLA_EQ_ADA_EN; + break; + case 'd': /* disable */ + val &=3D ~(TMDS181_CTRLA_EQ_ADA_EN | TMDS181_CTRLA_EQ_EN); + break; + } + } + + /* Always set the "apply changes" bit */ + val |=3D TMDS181_CTRLA_APPLY; + + ret =3D regmap_write(data->regmap, TMDS181_REG_CTRLA, val); + if (ret < 0) + return ret; + + return len; +} + +/* termination for HDMI TX: 0=3Doff, 1=3D150..300, 3=3D75..150 ohms */ +static ssize_t termination_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct tmds181_data *data =3D dev_get_drvdata(dev); + u32 val; + int ret; + + ret =3D regmap_read(data->regmap, TMDS181_REG_CTRLB, &val); + if (ret < 0) + return ret; + + return scnprintf(buf, PAGE_SIZE, "%u\n", + FIELD_GET(TMDS181_CTRLB_TX_TERM_CTL, val)); +} + +static ssize_t termination_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct tmds181_data *data =3D dev_get_drvdata(dev); + u32 val; + unsigned long newval; + int ret; + + ret =3D regmap_read(data->regmap, TMDS181_REG_CTRLB, &val); + if (ret < 0) + return ret; + + ret =3D kstrtoul((const char *) buf, 10, &newval); + if (ret) + return ret; + + if (newval > 3) + return -EINVAL; + + val &=3D ~TMDS181_CTRLB_TX_TERM_CTL; + val |=3D FIELD_PREP(TMDS181_CTRLB_TX_TERM_CTL, newval); + + ret =3D regmap_write(data->regmap, TMDS181_REG_CTRLB, val); + if (ret < 0) + return ret; + + return len; +} + +static DEVICE_ATTR_RW(mode); +static DEVICE_ATTR_RW(termination); + +static struct attribute *tmds181_attrs[] =3D { + &dev_attr_mode.attr, + &dev_attr_termination.attr, + NULL, +}; + +static const struct attribute_group tmds181_attr_group =3D { + .attrs =3D tmds181_attrs, +}; + +static const u8 tmds181_id_tmds181[8] __nonstring =3D "TMDS181 "; +static const u8 tmds181_id_dp159[8] __nonstring =3D "DP159 "; + +static int tmds181_check_id(struct tmds181_data *data) +{ + int ret; + int retry; + u8 buffer[8]; + + for (retry =3D 0; retry < 20; ++retry) { + ret =3D regmap_bulk_read(data->regmap, TMDS181_REG_ID, buffer, + sizeof(buffer)); + if (!ret) + break; + + /* Compensate for very long OE power-up delays due to the cap */ + usleep_range(5000, 10000); + } + + if (ret) { + dev_err(&data->client->dev, "I2C read ID failed\n"); + return ret; + } + + if (memcmp(buffer, tmds181_id_tmds181, sizeof(buffer)) =3D=3D 0) { + dev_info(&data->client->dev, "Detected: TMDS181\n"); + data->chip =3D tmds181; + return 0; + } + + if (memcmp(buffer, tmds181_id_dp159, sizeof(buffer)) =3D=3D 0) { + dev_info(&data->client->dev, "Detected: DP159\n"); + data->chip =3D dp159; + return 0; + } + + dev_err(&data->client->dev, "Unknown ID: %*pE\n", (int)sizeof(buffer), bu= ffer); + + return -ENODEV; +} + +static bool tmds181_regmap_is_volatile(struct device *dev, unsigned int re= g) +{ + switch (reg) { + /* IBERT result and status registers, not used yet */ + case 0x15: + case 0x17 ... 0x1F: + return true; + default: + return false; + } +} + +static const struct regmap_config tmds181_regmap_config =3D { + .reg_bits =3D 8, + .val_bits =3D 8, + .cache_type =3D REGCACHE_RBTREE, + .max_register =3D 0x20, + .volatile_reg =3D tmds181_regmap_is_volatile, +}; + +static int tmds181_probe(struct i2c_client *client) +{ + struct tmds181_data *data; + struct gpio_desc *oe_gpio; + int ret; + u32 param; + u8 val; + + /* Check if the adapter supports the needed features */ + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -EIO; + + data =3D devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->client =3D client; + i2c_set_clientdata(client, data); + data->regmap =3D devm_regmap_init_i2c(client, &tmds181_regmap_config); + if (IS_ERR(data->regmap)) + return PTR_ERR(data->regmap); + + /* The "OE" pin acts as a reset */ + oe_gpio =3D devm_gpiod_get_optional(&client->dev, "oe", GPIOD_OUT_LOW); + if (IS_ERR(oe_gpio)) { + ret =3D PTR_ERR(oe_gpio); + if (ret !=3D -EPROBE_DEFER) + dev_err(&client->dev, "failed to acquire 'oe' gpio\n"); + return ret; + } + if (oe_gpio) { + /* Need at least 100us reset pulse */ + usleep_range(100, 200); + gpiod_set_value_cansleep(oe_gpio, 1); + } + + /* Reading the ID also provides enough time for the reset */ + ret =3D tmds181_check_id(data); + if (ret) + return ret; + + /* + * We take care of power control, so disable the chips PM functions, and + * allow the DDC to run at 400kHz + */ + regmap_update_bits(data->regmap, TMDS181_REG_CTRL9, + TMDS181_CTRL9_SIG_EN | TMDS181_CTRL9_PD_EN | + TMDS181_CTRL9_HPD_AUTO_PWRDWN_DISABLE | + TMDS181_CTRL9_I2C_DR_CTL, + TMDS181_CTRL9_PD_EN | + TMDS181_CTRL9_HPD_AUTO_PWRDWN_DISABLE | + TMDS181_CTRL9_I2C_DR_CTL); + + /* Apply configuration changes */ + if (of_property_read_bool(client->dev.of_node, "source-mode")) + regmap_update_bits(data->regmap, TMDS181_REG_CTRLA, + TMDS181_CTRLA_MODE_SINK, 0); + if (of_property_read_bool(client->dev.of_node, "sink-mode")) + regmap_update_bits(data->regmap, TMDS181_REG_CTRLA, + TMDS181_CTRLA_MODE_SINK, TMDS181_CTRLA_MODE_SINK); + + /* + * Using the automatic modes of the chip uses considerable power as it + * will keep the PLL running at all times. So instead, define our own + * threshold for the pixel rate. This also allows to use a sane default + * of 200MHz pixel rate for the redriver-retimer crossover point, as the + * modes below 3k don't show any benefit from the retimer. + */ + data->retimer_threshold_khz =3D 200000; + if (!of_property_read_u32(client->dev.of_node, + "ti,retimer-threshold-hz", ¶m)) + data->retimer_threshold_khz =3D param / 1000; + + /* Default to low-power redriver mode */ + regmap_update_bits(data->regmap, TMDS181_REG_CTRLA, + TMDS181_CTRLA_DEV_FUNC_MODE, 0x00); + + if (of_property_read_bool(client->dev.of_node, "ti,adaptive-equalizer")) + regmap_update_bits(data->regmap, TMDS181_REG_CTRLA, + TMDS181_CTRLA_EQ_EN | TMDS181_CTRLA_EQ_ADA_EN, + TMDS181_CTRLA_EQ_EN | TMDS181_CTRLA_EQ_ADA_EN); + if (of_property_read_bool(client->dev.of_node, "ti,disable-equalizer")) + regmap_update_bits(data->regmap, TMDS181_REG_CTRLA, + TMDS181_CTRLA_EQ_EN | TMDS181_CTRLA_EQ_ADA_EN, + 0); + + switch (data->chip) { + case dp159: + val =3D 0; + if (!of_property_read_u32(client->dev.of_node, + "slew-rate", ¶m)) { + if (param > 3) { + dev_err(&client->dev, "invalid slew-rate\n"); + return -EINVAL; + } + /* Implement 0 =3D slow, 3 =3D fast slew rate */ + val =3D FIELD_PREP(TMDS181_CTRLB_SLEW_CTL, (3 - param)); + } + if (of_property_read_bool(client->dev.of_node, "ti,dvi-mode")) + val |=3D TMDS181_CTRLB_HDMI_SEL_DVI; + break; + default: + val =3D TMDS181_CTRLB_DDC_DR_SEL; + break; + } + + /* Default to low-speed termination */ + val |=3D FIELD_PREP(TMDS181_CTRLB_TX_TERM_CTL, TMDS181_CTRLB_TX_TERM_150_= 300_OHMS); + + ret =3D regmap_write(data->regmap, TMDS181_REG_CTRLB, val); + if (ret < 0) { + dev_err(&client->dev, "regmap_write(B) failed\n"); + return ret; + } + + ret =3D sysfs_create_group(&client->dev.kobj, &tmds181_attr_group); + if (ret) + dev_err(&client->dev, "sysfs_create_group error: %d\n", ret); + + /* Find next bridge in chain */ + data->next_bridge =3D devm_drm_of_get_bridge(&client->dev, client->dev.of= _node, 1, 0); + if (IS_ERR(data->next_bridge)) + return dev_err_probe(&client->dev, PTR_ERR(data->next_bridge), + "Failed to find next bridge\n"); + + /* Register the bridge. */ + data->bridge.funcs =3D &tmds181_bridge_funcs; + data->bridge.of_node =3D client->dev.of_node; + + return devm_drm_bridge_add(&client->dev, &data->bridge); +} + +static const struct i2c_device_id tmds181_id[] =3D { + { "tmds181", tmds181 }, + { "sn65dp159", dp159 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, tmds181_id); + +#if IS_ENABLED(CONFIG_OF) +static const struct of_device_id tmds181_of_match[] =3D { + { .compatible =3D "ti,tmds181", }, + { .compatible =3D "ti,sn65dp159", }, + {} +}; +MODULE_DEVICE_TABLE(of, tmds181_of_match); +#endif + +static struct i2c_driver tmds181_driver =3D { + .driver =3D { + .owner =3D THIS_MODULE, + .name =3D "tmds181", + .of_match_table =3D of_match_ptr(tmds181_of_match), + }, + .probe =3D tmds181_probe, + .id_table =3D tmds181_id, +}; + +module_i2c_driver(tmds181_driver); --=20 2.43.0 Met vriendelijke groet / kind regards, Mike Looijmans System Expert TOPIC Embedded Products B.V. Materiaalweg 4, 5681 RJ Best The Netherlands T: +31 (0) 499 33 69 69 E: mike.looijmans@topic.nl W: www.topic.nl Please consider the environment before printing this e-mail