* [PATCH v8 0/2] Add support of Lontium lt8912 MIPI to HDMI bridge
@ 2021-03-23 18:14 ` Adrien Grassein
0 siblings, 0 replies; 6+ messages in thread
From: Adrien Grassein @ 2021-03-23 18:14 UTC (permalink / raw)
Cc: robert.foss, airlied, daniel, a.hajda, robh+dt, narmstrong,
Laurent.pinchart, jonas, jernej.skrabec, dri-devel, devicetree,
linux-kernel, Adrien Grassein
Hi,
this patch set adds the support of the Lontium lt8912 MIPI to HDMI
bridge in the kernel.
It's only support the video part, not the audio part yet
since I don't have the datasheet of this component.
I get the current i2c configuration from Digi and
Boundary drivers.
Developed using the DB_DSIHD board from BoundaryDevices.
Update in v2
- Use standard data-lanes instead of a custom prop;
- Use hdmi-connector node.
Update in v3
- Fix indentation;
- Implement missing bridge functions;
- Add some comments.
Update in v4
- Fix bridge ops;
- Fix i2c error detection.
Update in v5
- Fix lt8912 name (lt8912b instead of lt8912);
- Implement HPD via a workaround. In fact I don't have the datasheet
of this component yet so I can't say if the configuration of the
registers is correct or if I have an HW issue on my board. So, I choose
to implement a fake version of HPD using a workqueue and polling the
status regularly.
Update in v6
- Fix a warning found by "kernel test robot"
Update in v7
- Fix HPD logic (via an HW emulation);
- HPD from chip is still not working.
Update in v8
- Remove HPD logic (will be added later when HW bug qill be fixed).
Thanks,
Adrien Grassein (2):
dt-bindings: display: bridge: Add documentation for LT8912B
drm/bridge: Introduce LT8912B DSI to HDMI bridge
.../display/bridge/lontium,lt8912b.yaml | 102 +++
MAINTAINERS | 6 +
drivers/gpu/drm/bridge/Kconfig | 14 +
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/lontium-lt8912b.c | 765 ++++++++++++++++++
5 files changed, 888 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml
create mode 100644 drivers/gpu/drm/bridge/lontium-lt8912b.c
--
2.25.1
^ permalink raw reply [flat|nested] 6+ messages in thread* [PATCH v8 0/2] Add support of Lontium lt8912 MIPI to HDMI bridge @ 2021-03-23 18:14 ` Adrien Grassein 0 siblings, 0 replies; 6+ messages in thread From: Adrien Grassein @ 2021-03-23 18:14 UTC (permalink / raw) Cc: devicetree, jernej.skrabec, narmstrong, airlied, dri-devel, jonas, linux-kernel, robert.foss, a.hajda, robh+dt, Laurent.pinchart, Adrien Grassein Hi, this patch set adds the support of the Lontium lt8912 MIPI to HDMI bridge in the kernel. It's only support the video part, not the audio part yet since I don't have the datasheet of this component. I get the current i2c configuration from Digi and Boundary drivers. Developed using the DB_DSIHD board from BoundaryDevices. Update in v2 - Use standard data-lanes instead of a custom prop; - Use hdmi-connector node. Update in v3 - Fix indentation; - Implement missing bridge functions; - Add some comments. Update in v4 - Fix bridge ops; - Fix i2c error detection. Update in v5 - Fix lt8912 name (lt8912b instead of lt8912); - Implement HPD via a workaround. In fact I don't have the datasheet of this component yet so I can't say if the configuration of the registers is correct or if I have an HW issue on my board. So, I choose to implement a fake version of HPD using a workqueue and polling the status regularly. Update in v6 - Fix a warning found by "kernel test robot" Update in v7 - Fix HPD logic (via an HW emulation); - HPD from chip is still not working. Update in v8 - Remove HPD logic (will be added later when HW bug qill be fixed). Thanks, Adrien Grassein (2): dt-bindings: display: bridge: Add documentation for LT8912B drm/bridge: Introduce LT8912B DSI to HDMI bridge .../display/bridge/lontium,lt8912b.yaml | 102 +++ MAINTAINERS | 6 + drivers/gpu/drm/bridge/Kconfig | 14 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/lontium-lt8912b.c | 765 ++++++++++++++++++ 5 files changed, 888 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml create mode 100644 drivers/gpu/drm/bridge/lontium-lt8912b.c -- 2.25.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel ^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v8 1/2] dt-bindings: display: bridge: Add documentation for LT8912B 2021-03-23 18:14 ` Adrien Grassein @ 2021-03-23 18:14 ` Adrien Grassein -1 siblings, 0 replies; 6+ messages in thread From: Adrien Grassein @ 2021-03-23 18:14 UTC (permalink / raw) Cc: robert.foss, airlied, daniel, a.hajda, robh+dt, narmstrong, Laurent.pinchart, jonas, jernej.skrabec, dri-devel, devicetree, linux-kernel, Adrien Grassein, Rob Herring Lontium LT8912B is a DSI to HDMI bridge. Signed-off-by: Adrien Grassein <adrien.grassein@gmail.com> Reviewed-by: Rob Herring <robh@kernel.org> --- .../display/bridge/lontium,lt8912b.yaml | 102 ++++++++++++++++++ MAINTAINERS | 5 + 2 files changed, 107 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml diff --git a/Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml b/Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml new file mode 100644 index 000000000000..735d0233a7d6 --- /dev/null +++ b/Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml @@ -0,0 +1,102 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/display/bridge/lontium,lt8912b.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Lontium LT8912B MIPI to HDMI Bridge + +maintainers: + - Adrien Grassein <adrien.grassein@gmail.com> + +description: | + The LT8912B is a bridge device which convert DSI to HDMI + +properties: + compatible: + enum: + - lontium,lt8912b + + reg: + maxItems: 1 + + reset-gpios: + maxItems: 1 + description: GPIO connected to active high RESET pin. + + ports: + $ref: /schemas/graph.yaml#/properties/ports + + properties: + port@0: + $ref: /schemas/graph.yaml#/properties/port + description: + Primary MIPI port for MIPI input + + properties: + endpoint: + $ref: /schemas/media/video-interfaces.yaml# + unevaluatedProperties: false + + properties: + data-lanes: true + + required: + - data-lanes + + port@1: + $ref: /schemas/graph.yaml#/properties/port + description: | + HDMI port, should be connected to a node compatible with the + hdmi-connector binding. + + required: + - port@0 + - port@1 + +required: + - compatible + - reg + - reset-gpios + - ports + +additionalProperties: false + +examples: + - | + #include <dt-bindings/gpio/gpio.h> + + i2c4 { + #address-cells = <1>; + #size-cells = <0>; + + hdmi-bridge@48 { + compatible = "lontium,lt8912b"; + reg = <0x48>; + reset-gpios = <&max7323 0 GPIO_ACTIVE_LOW>; + + ports { + #address-cells = <1>; + #size-cells = <0>; + + port@0 { + reg = <0>; + + hdmi_out_in: endpoint { + data-lanes = <0 1 2 3>; + remote-endpoint = <&mipi_dsi_out>; + }; + }; + + port@1 { + reg = <1>; + + endpoint { + remote-endpoint = <&hdmi_in>; + }; + }; + }; + }; + }; + +... diff --git a/MAINTAINERS b/MAINTAINERS index 8c44fd8fd85d..d9a125e5d295 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -10526,6 +10526,11 @@ S: Maintained T: git git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git F: drivers/hid/hid-lg-g15.c +LONTIUM LT8912B MIPI TO HDMI BRIDGE +M: Adrien Grassein <adrien.grassein@gmail.com> +S: Maintained +F: Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml + LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI) M: Sathya Prakash <sathya.prakash@broadcom.com> M: Sreekanth Reddy <sreekanth.reddy@broadcom.com> -- 2.25.1 ^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v8 1/2] dt-bindings: display: bridge: Add documentation for LT8912B @ 2021-03-23 18:14 ` Adrien Grassein 0 siblings, 0 replies; 6+ messages in thread From: Adrien Grassein @ 2021-03-23 18:14 UTC (permalink / raw) Cc: devicetree, jernej.skrabec, narmstrong, airlied, dri-devel, jonas, linux-kernel, robert.foss, a.hajda, robh+dt, Laurent.pinchart, Adrien Grassein Lontium LT8912B is a DSI to HDMI bridge. Signed-off-by: Adrien Grassein <adrien.grassein@gmail.com> Reviewed-by: Rob Herring <robh@kernel.org> --- .../display/bridge/lontium,lt8912b.yaml | 102 ++++++++++++++++++ MAINTAINERS | 5 + 2 files changed, 107 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml diff --git a/Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml b/Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml new file mode 100644 index 000000000000..735d0233a7d6 --- /dev/null +++ b/Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml @@ -0,0 +1,102 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/display/bridge/lontium,lt8912b.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Lontium LT8912B MIPI to HDMI Bridge + +maintainers: + - Adrien Grassein <adrien.grassein@gmail.com> + +description: | + The LT8912B is a bridge device which convert DSI to HDMI + +properties: + compatible: + enum: + - lontium,lt8912b + + reg: + maxItems: 1 + + reset-gpios: + maxItems: 1 + description: GPIO connected to active high RESET pin. + + ports: + $ref: /schemas/graph.yaml#/properties/ports + + properties: + port@0: + $ref: /schemas/graph.yaml#/properties/port + description: + Primary MIPI port for MIPI input + + properties: + endpoint: + $ref: /schemas/media/video-interfaces.yaml# + unevaluatedProperties: false + + properties: + data-lanes: true + + required: + - data-lanes + + port@1: + $ref: /schemas/graph.yaml#/properties/port + description: | + HDMI port, should be connected to a node compatible with the + hdmi-connector binding. + + required: + - port@0 + - port@1 + +required: + - compatible + - reg + - reset-gpios + - ports + +additionalProperties: false + +examples: + - | + #include <dt-bindings/gpio/gpio.h> + + i2c4 { + #address-cells = <1>; + #size-cells = <0>; + + hdmi-bridge@48 { + compatible = "lontium,lt8912b"; + reg = <0x48>; + reset-gpios = <&max7323 0 GPIO_ACTIVE_LOW>; + + ports { + #address-cells = <1>; + #size-cells = <0>; + + port@0 { + reg = <0>; + + hdmi_out_in: endpoint { + data-lanes = <0 1 2 3>; + remote-endpoint = <&mipi_dsi_out>; + }; + }; + + port@1 { + reg = <1>; + + endpoint { + remote-endpoint = <&hdmi_in>; + }; + }; + }; + }; + }; + +... diff --git a/MAINTAINERS b/MAINTAINERS index 8c44fd8fd85d..d9a125e5d295 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -10526,6 +10526,11 @@ S: Maintained T: git git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git F: drivers/hid/hid-lg-g15.c +LONTIUM LT8912B MIPI TO HDMI BRIDGE +M: Adrien Grassein <adrien.grassein@gmail.com> +S: Maintained +F: Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml + LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI) M: Sathya Prakash <sathya.prakash@broadcom.com> M: Sreekanth Reddy <sreekanth.reddy@broadcom.com> -- 2.25.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel ^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v8 2/2] drm/bridge: Introduce LT8912B DSI to HDMI bridge 2021-03-23 18:14 ` Adrien Grassein @ 2021-03-23 18:14 ` Adrien Grassein -1 siblings, 0 replies; 6+ messages in thread From: Adrien Grassein @ 2021-03-23 18:14 UTC (permalink / raw) Cc: robert.foss, airlied, daniel, a.hajda, robh+dt, narmstrong, Laurent.pinchart, jonas, jernej.skrabec, dri-devel, devicetree, linux-kernel, Adrien Grassein, kernel test robot Lontium LT8912B is a DSI to HDMI bridge. Signed-off-by: Adrien Grassein <adrien.grassein@gmail.com> Reported-by: kernel test robot <lkp@intel.com> Reviewed-by: Robert Foss <robert.foss@linaro.org> --- MAINTAINERS | 1 + drivers/gpu/drm/bridge/Kconfig | 14 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/lontium-lt8912b.c | 765 +++++++++++++++++++++++ 4 files changed, 781 insertions(+) create mode 100644 drivers/gpu/drm/bridge/lontium-lt8912b.c diff --git a/MAINTAINERS b/MAINTAINERS index d9a125e5d295..6af083797947 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -10530,6 +10530,7 @@ LONTIUM LT8912B MIPI TO HDMI BRIDGE M: Adrien Grassein <adrien.grassein@gmail.com> S: Maintained F: Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml +F: drivers/gpu/drm/bridge/lontium-lt8912b.c LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI) M: Sathya Prakash <sathya.prakash@broadcom.com> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index e4110d6ca7b3..f2c5ec75d2f5 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -48,6 +48,20 @@ config DRM_DISPLAY_CONNECTOR on ARM-based platforms. Saying Y here when this driver is not needed will not cause any issue. +config DRM_LONTIUM_LT8912B + tristate "Lontium LT8912B DSI/HDMI bridge" + depends on OF + select DRM_PANEL_BRIDGE + select DRM_KMS_HELPER + select REGMAP_I2C + help + Driver for Lontium LT8912B DSI to HDMI bridge + chip driver. + Please say Y if you have such hardware. + + Say M here if you want to support this hardware as a module. + The module will be named "lontium-lt8912b". + config DRM_LONTIUM_LT9611 tristate "Lontium LT9611 DSI/HDMI bridge" select SND_SOC_HDMI_CODEC if SND_SOC diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index 86e7acc76f8d..756ce401aad3 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -2,6 +2,7 @@ obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o obj-$(CONFIG_DRM_CHRONTEL_CH7033) += chrontel-ch7033.o obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) += display-connector.o +obj-$(CONFIG_DRM_LONTIUM_LT8912B) += lontium-lt8912b.o obj-$(CONFIG_DRM_LONTIUM_LT9611) += lontium-lt9611.o obj-$(CONFIG_DRM_LONTIUM_LT9611UXC) += lontium-lt9611uxc.o obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c new file mode 100644 index 000000000000..fd0ec1c84368 --- /dev/null +++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c @@ -0,0 +1,765 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2018, The Linux Foundation. All rights reserved. + */ + +#include <linux/device.h> +#include <linux/delay.h> +#include <linux/i2c.h> +#include <linux/gpio.h> +#include <linux/of_gpio.h> +#include <linux/regmap.h> + +#include <drm/drm_probe_helper.h> +#include <drm/drm_atomic_helper.h> +#include <drm/drm_mipi_dsi.h> +#include <drm/drm_of.h> + +#include <video/videomode.h> + +#define I2C_MAIN 0 +#define I2C_ADDR_MAIN 0x48 + +#define I2C_CEC_DSI 1 +#define I2C_ADDR_CEC_DSI 0x49 + +#define I2C_MAX_IDX 2 + +struct lt8912 { + struct device *dev; + struct drm_bridge bridge; + struct drm_connector connector; + + struct i2c_client *i2c_client[I2C_MAX_IDX]; + struct regmap *regmap[I2C_MAX_IDX]; + + struct device_node *host_node; + struct drm_bridge *hdmi_port; + + struct mipi_dsi_device *dsi; + + struct gpio_desc *gp_reset; + + struct videomode mode; + + u8 data_lanes; + bool is_power_on; + bool is_attached; +}; + +static int lt8912_write_init_config(struct lt8912 *lt) +{ + const struct reg_sequence seq[] = { + /* Digital clock en*/ + {0x08, 0xff}, + {0x09, 0xff}, + {0x0a, 0xff}, + {0x0b, 0x7c}, + {0x0c, 0xff}, + {0x42, 0x04}, + + /*Tx Analog*/ + {0x31, 0xb1}, + {0x32, 0xb1}, + {0x33, 0x0e}, + {0x37, 0x00}, + {0x38, 0x22}, + {0x60, 0x82}, + + /*Cbus Analog*/ + {0x39, 0x45}, + {0x3a, 0x00}, + {0x3b, 0x00}, + + /*HDMI Pll Analog*/ + {0x44, 0x31}, + {0x55, 0x44}, + {0x57, 0x01}, + {0x5a, 0x02}, + + /*MIPI Analog*/ + {0x3e, 0xd6}, + {0x3f, 0xd4}, + {0x41, 0x3c}, + {0xB2, 0x00}, + }; + + return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq)); +} + +static int lt8912_write_mipi_basic_config(struct lt8912 *lt) +{ + const struct reg_sequence seq[] = { + {0x12, 0x04}, + {0x14, 0x00}, + {0x15, 0x00}, + {0x1a, 0x03}, + {0x1b, 0x03}, + }; + + return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); +}; + +static int lt8912_write_dds_config(struct lt8912 *lt) +{ + const struct reg_sequence seq[] = { + {0x4e, 0xff}, + {0x4f, 0x56}, + {0x50, 0x69}, + {0x51, 0x80}, + {0x1f, 0x5e}, + {0x20, 0x01}, + {0x21, 0x2c}, + {0x22, 0x01}, + {0x23, 0xfa}, + {0x24, 0x00}, + {0x25, 0xc8}, + {0x26, 0x00}, + {0x27, 0x5e}, + {0x28, 0x01}, + {0x29, 0x2c}, + {0x2a, 0x01}, + {0x2b, 0xfa}, + {0x2c, 0x00}, + {0x2d, 0xc8}, + {0x2e, 0x00}, + {0x42, 0x64}, + {0x43, 0x00}, + {0x44, 0x04}, + {0x45, 0x00}, + {0x46, 0x59}, + {0x47, 0x00}, + {0x48, 0xf2}, + {0x49, 0x06}, + {0x4a, 0x00}, + {0x4b, 0x72}, + {0x4c, 0x45}, + {0x4d, 0x00}, + {0x52, 0x08}, + {0x53, 0x00}, + {0x54, 0xb2}, + {0x55, 0x00}, + {0x56, 0xe4}, + {0x57, 0x0d}, + {0x58, 0x00}, + {0x59, 0xe4}, + {0x5a, 0x8a}, + {0x5b, 0x00}, + {0x5c, 0x34}, + {0x1e, 0x4f}, + {0x51, 0x00}, + }; + + return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); +} + +static int lt8912_write_rxlogicres_config(struct lt8912 *lt) +{ + int ret; + + ret = regmap_write(lt->regmap[I2C_MAIN], 0x03, 0x7f); + usleep_range(10000, 20000); + ret |= regmap_write(lt->regmap[I2C_MAIN], 0x03, 0xff); + + return ret; +}; + +static int lt8912_write_lvds_config(struct lt8912 *lt) +{ + const struct reg_sequence seq[] = { + {0x44, 0x30}, + {0x51, 0x05}, + {0x50, 0x24}, + {0x51, 0x2d}, + {0x52, 0x04}, + {0x69, 0x0e}, + {0x69, 0x8e}, + {0x6a, 0x00}, + {0x6c, 0xb8}, + {0x6b, 0x51}, + {0x04, 0xfb}, + {0x04, 0xff}, + {0x7f, 0x00}, + {0xa8, 0x13}, + {0x02, 0xf7}, + {0x02, 0xff}, + {0x03, 0xcf}, + {0x03, 0xff}, + }; + + return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); +}; + +static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b) +{ + return container_of(b, struct lt8912, bridge); +} + +static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c) +{ + return container_of(c, struct lt8912, connector); +} + +static const struct regmap_config lt8912_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0xff, +}; + +static int lt8912_init_i2c(struct lt8912 *lt, struct i2c_client *client) +{ + unsigned int i; + /* + * At this time we only initialize 2 chips, but the lt8912 provides + * a third interface for the audio over HDMI configuration. + */ + struct i2c_board_info info[] = { + { I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), }, + { I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), }, + }; + + if (!lt) + return -ENODEV; + + for (i = 0; i < ARRAY_SIZE(info); i++) { + if (i > 0) { + lt->i2c_client[i] = i2c_new_dummy_device(client->adapter, + info[i].addr); + if (IS_ERR(lt->i2c_client[i])) + return PTR_ERR(lt->i2c_client[i]); + } + + lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i], + <8912_regmap_config); + if (IS_ERR(lt->regmap[i])) + return PTR_ERR(lt->regmap[i]); + } + return 0; +} + +static int lt8912_free_i2c(struct lt8912 *lt) +{ + unsigned int i; + + for (i = 1; i < I2C_MAX_IDX; i++) + i2c_unregister_device(lt->i2c_client[i]); + + return 0; +} + +static int lt8912_hard_power_on(struct lt8912 *lt) +{ + gpiod_set_value_cansleep(lt->gp_reset, 0); + msleep(20); + + return 0; +} + +static void lt8912_hard_power_off(struct lt8912 *lt) +{ + gpiod_set_value_cansleep(lt->gp_reset, 1); + msleep(20); + lt->is_power_on = false; +} + +static int lt8912_video_setup(struct lt8912 *lt) +{ + u32 hactive, h_total, hpw, hfp, hbp; + u32 vactive, v_total, vpw, vfp, vbp; + u8 settle = 0x08; + int ret; + + if (!lt) + return -EINVAL; + + hactive = lt->mode.hactive; + hfp = lt->mode.hfront_porch; + hpw = lt->mode.hsync_len; + hbp = lt->mode.hback_porch; + h_total = hactive + hfp + hpw + hbp; + + vactive = lt->mode.vactive; + vfp = lt->mode.vfront_porch; + vpw = lt->mode.vsync_len; + vbp = lt->mode.vback_porch; + v_total = vactive + vfp + vpw + vbp; + + if (vactive <= 600) + settle = 0x04; + else if (vactive == 1080) + settle = 0x0a; + + ret = regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8); + + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c); + + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8); + + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8); + + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8); + + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8); + + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8); + + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8); + + return ret; +} + +static int lt8912_soft_power_on(struct lt8912 *lt) +{ + if (!lt->is_power_on) { + u32 lanes = lt->data_lanes; + + lt8912_write_init_config(lt); + regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3); + + lt8912_write_mipi_basic_config(lt); + + lt->is_power_on = true; + } + + return 0; +} + +static int lt8912_video_on(struct lt8912 *lt) +{ + int ret; + + ret = lt8912_video_setup(lt); + if (ret < 0) + goto end; + + ret = lt8912_write_dds_config(lt); + if (ret < 0) + goto end; + + ret = lt8912_write_rxlogicres_config(lt); + if (ret < 0) + goto end; + + ret = lt8912_write_lvds_config(lt); + if (ret < 0) + goto end; + +end: + return ret; +} + +static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt) +{ + int ret; + unsigned int reg_val; + + ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, ®_val); + if (ret) + return connector_status_unknown; + + if (reg_val & BIT(7)) + return connector_status_connected; + + return connector_status_disconnected; +} + +static enum drm_connector_status +lt8912_connector_detect(struct drm_connector *connector, bool force) +{ + struct lt8912 *lt = connector_to_lt8912(connector); + + if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) + return drm_bridge_detect(lt->hdmi_port); + + return lt8912_check_cable_status(lt); +} + +static const struct drm_connector_funcs lt8912_connector_funcs = { + .detect = lt8912_connector_detect, + .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, +}; + +static enum drm_mode_status +lt8912_connector_mode_valid(struct drm_connector *connector, + struct drm_display_mode *mode) +{ + if (mode->clock > 150000) + return MODE_CLOCK_HIGH; + + if (mode->hdisplay > 1920) + return MODE_BAD_HVALUE; + + if (mode->vdisplay > 1080) + return MODE_BAD_VVALUE; + + return MODE_OK; +} + +static int lt8912_connector_get_modes(struct drm_connector *connector) +{ + struct edid *edid; + int ret = -1; + int num = 0; + struct lt8912 *lt = connector_to_lt8912(connector); + u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; + + edid = drm_bridge_get_edid(lt->hdmi_port, connector); + if (edid) { + drm_connector_update_edid_property(connector, edid); + num = drm_add_edid_modes(connector, edid); + } else + return ret; + + ret = drm_display_info_set_bus_formats(&connector->display_info, + &bus_format, 1); + if (ret) + num = ret; + + kfree(edid); + return num; +} + +static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = { + .get_modes = lt8912_connector_get_modes, + .mode_valid = lt8912_connector_mode_valid, +}; + +static void lt8912_bridge_mode_set(struct drm_bridge *bridge, + const struct drm_display_mode *mode, + const struct drm_display_mode *adj) +{ + struct lt8912 *lt = bridge_to_lt8912(bridge); + + drm_display_mode_to_videomode(adj, <->mode); +} + +static void lt8912_bridge_enable(struct drm_bridge *bridge) +{ + struct lt8912 *lt = bridge_to_lt8912(bridge); + + lt8912_video_on(lt); +} + +static int lt8912_attach_dsi(struct lt8912 *lt) +{ + struct device *dev = lt->dev; + struct mipi_dsi_host *host; + struct mipi_dsi_device *dsi; + int ret = -1; + const struct mipi_dsi_device_info info = { .type = "lt8912", + .channel = 0, + .node = NULL, + }; + + host = of_find_mipi_dsi_host_by_node(lt->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)) { + ret = PTR_ERR(dsi); + dev_err(dev, "failed to create dsi device (%d)\n", ret); + goto err_dsi_device; + } + + lt->dsi = dsi; + + dsi->lanes = lt->data_lanes; + dsi->format = MIPI_DSI_FMT_RGB888; + + dsi->mode_flags = MIPI_DSI_MODE_VIDEO | + MIPI_DSI_MODE_VIDEO_BURST | + MIPI_DSI_MODE_LPM | + MIPI_DSI_MODE_EOT_PACKET; + + 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 void lt8912_detach_dsi(struct lt8912 *lt) +{ + mipi_dsi_detach(lt->dsi); + mipi_dsi_device_unregister(lt->dsi); +} + +static int lt8912_bridge_connector_init(struct drm_bridge *bridge) +{ + int ret; + struct lt8912 *lt = bridge_to_lt8912(bridge); + struct drm_connector *connector = <->connector; + + connector->polled = DRM_CONNECTOR_POLL_CONNECT | + DRM_CONNECTOR_POLL_DISCONNECT; + + ret = drm_connector_init(bridge->dev, connector, + <8912_connector_funcs, + lt->hdmi_port->type); + if (ret) + goto exit; + + drm_connector_helper_add(connector, <8912_connector_helper_funcs); + + connector->dpms = DRM_MODE_DPMS_OFF; + drm_connector_attach_encoder(connector, bridge->encoder); + +exit: + return ret; +} + +static int lt8912_bridge_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct lt8912 *lt = bridge_to_lt8912(bridge); + int ret; + + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { + ret = lt8912_bridge_connector_init(bridge); + if (ret) { + dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret); + return ret; + } + } + + ret = lt8912_hard_power_on(lt); + if (ret) + return ret; + + ret = lt8912_soft_power_on(lt); + if (ret) + goto error; + + ret = lt8912_attach_dsi(lt); + if (ret) + goto error; + + lt->is_attached = true; + + return 0; + +error: + lt8912_hard_power_off(lt); + return ret; +} + +static void lt8912_bridge_detach(struct drm_bridge *bridge) +{ + struct lt8912 *lt = bridge_to_lt8912(bridge); + + if (lt->is_attached) { + lt8912_detach_dsi(lt); + lt8912_hard_power_off(lt); + drm_connector_unregister(<->connector); + drm_connector_cleanup(<->connector); + } + +} + +static enum drm_connector_status +lt8912_bridge_detect(struct drm_bridge *bridge) +{ + struct lt8912 *lt = bridge_to_lt8912(bridge); + + if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) + return drm_bridge_detect(lt->hdmi_port); + + return lt8912_check_cable_status(lt); +} + +static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge, + struct drm_connector *connector) +{ + struct lt8912 *lt = bridge_to_lt8912(bridge); + + /* + * edid must be read through the ddc bus but it must be + * given to the hdmi connector node. + */ + if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID) + return drm_bridge_get_edid(lt->hdmi_port, connector); + + dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n"); + return NULL; +} + +static const struct drm_bridge_funcs lt8912_bridge_funcs = { + .attach = lt8912_bridge_attach, + .detach = lt8912_bridge_detach, + .mode_set = lt8912_bridge_mode_set, + .enable = lt8912_bridge_enable, + .detect = lt8912_bridge_detect, + .get_edid = lt8912_bridge_get_edid, +}; + +static int lt8912_parse_dt(struct lt8912 *lt) +{ + struct gpio_desc *gp_reset; + struct device *dev = lt->dev; + int ret = 0; + struct device_node *port_node; + struct device_node *endpoint; + + gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(gp_reset)) { + ret = PTR_ERR(gp_reset); + if (ret != -EPROBE_DEFER) + dev_err(dev, "Failed to get reset gpio: %d\n", ret); + return ret; + } + lt->gp_reset = gp_reset; + + endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1); + if (IS_ERR(endpoint)) { + ret = PTR_ERR(endpoint); + goto end; + } + + lt->data_lanes = of_property_count_u32_elems(endpoint, "data-lanes"); + of_node_put(endpoint); + + lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1); + if (!lt->host_node) { + dev_err(lt->dev, "%s: Failed to get remote port\n", __func__); + ret = -ENODEV; + goto end; + } + + port_node = of_graph_get_remote_node(dev->of_node, 1, -1); + if (!port_node) { + dev_err(lt->dev, "%s: Failed to get connector port\n", __func__); + ret = -ENODEV; + goto err_free_host_node; + } + + lt->hdmi_port = of_drm_find_bridge(port_node); + if (IS_ERR(lt->hdmi_port)) { + dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__); + ret = PTR_ERR(lt->hdmi_port); + of_node_put(lt->host_node); + goto end; + } + + if (!of_device_is_compatible(port_node, "hdmi-connector")) { + dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__); + ret = -EINVAL; + } + + of_node_put(port_node); + +end: + return ret; + +err_free_host_node: + of_node_put(lt->host_node); + return ret; +} + +static int lt8912_put_dt(struct lt8912 *lt) +{ + of_node_put(lt->host_node); + return 0; +} + +static int lt8912_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + static struct lt8912 *lt; + int ret = 0; + struct device *dev = &client->dev; + + lt = devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL); + if (!lt) + return -ENOMEM; + + lt->dev = dev; + lt->i2c_client[0] = client; + + ret = lt8912_parse_dt(lt); + if (ret) + goto err_dt_parse; + + ret = lt8912_init_i2c(lt, client); + if (ret) + goto err_i2c; + + i2c_set_clientdata(client, lt); + + lt->bridge.funcs = <8912_bridge_funcs; + lt->bridge.of_node = dev->of_node; + lt->bridge.ops = (DRM_BRIDGE_OP_EDID | + DRM_BRIDGE_OP_DETECT); + + drm_bridge_add(<->bridge); + + return 0; + +err_i2c: + lt8912_put_dt(lt); +err_dt_parse: + return ret; +} + +static int lt8912_remove(struct i2c_client *client) +{ + struct lt8912 *lt = i2c_get_clientdata(client); + + lt8912_bridge_detach(<->bridge); + drm_bridge_remove(<->bridge); + lt8912_free_i2c(lt); + lt8912_put_dt(lt); + return 0; +} + +static const struct of_device_id lt8912_dt_match[] = { + {.compatible = "lontium,lt8912b"}, + {} +}; +MODULE_DEVICE_TABLE(of, lt8912_dt_match); + +static const struct i2c_device_id lt8912_id[] = { + {"lt8912", 0}, + {}, +}; +MODULE_DEVICE_TABLE(i2c, lt8912_id); + +static struct i2c_driver lt8912_i2c_driver = { + .driver = { + .name = "lt8912", + .of_match_table = lt8912_dt_match, + .owner = THIS_MODULE, + }, + .probe = lt8912_probe, + .remove = lt8912_remove, + .id_table = lt8912_id, +}; +module_i2c_driver(lt8912_i2c_driver); + +MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>"); +MODULE_DESCRIPTION("lt8912 drm driver"); +MODULE_LICENSE("GPL v2"); -- 2.25.1 ^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v8 2/2] drm/bridge: Introduce LT8912B DSI to HDMI bridge @ 2021-03-23 18:14 ` Adrien Grassein 0 siblings, 0 replies; 6+ messages in thread From: Adrien Grassein @ 2021-03-23 18:14 UTC (permalink / raw) Cc: devicetree, jernej.skrabec, kernel test robot, narmstrong, airlied, dri-devel, jonas, linux-kernel, robert.foss, a.hajda, robh+dt, Laurent.pinchart, Adrien Grassein Lontium LT8912B is a DSI to HDMI bridge. Signed-off-by: Adrien Grassein <adrien.grassein@gmail.com> Reported-by: kernel test robot <lkp@intel.com> Reviewed-by: Robert Foss <robert.foss@linaro.org> --- MAINTAINERS | 1 + drivers/gpu/drm/bridge/Kconfig | 14 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/lontium-lt8912b.c | 765 +++++++++++++++++++++++ 4 files changed, 781 insertions(+) create mode 100644 drivers/gpu/drm/bridge/lontium-lt8912b.c diff --git a/MAINTAINERS b/MAINTAINERS index d9a125e5d295..6af083797947 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -10530,6 +10530,7 @@ LONTIUM LT8912B MIPI TO HDMI BRIDGE M: Adrien Grassein <adrien.grassein@gmail.com> S: Maintained F: Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml +F: drivers/gpu/drm/bridge/lontium-lt8912b.c LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI) M: Sathya Prakash <sathya.prakash@broadcom.com> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index e4110d6ca7b3..f2c5ec75d2f5 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -48,6 +48,20 @@ config DRM_DISPLAY_CONNECTOR on ARM-based platforms. Saying Y here when this driver is not needed will not cause any issue. +config DRM_LONTIUM_LT8912B + tristate "Lontium LT8912B DSI/HDMI bridge" + depends on OF + select DRM_PANEL_BRIDGE + select DRM_KMS_HELPER + select REGMAP_I2C + help + Driver for Lontium LT8912B DSI to HDMI bridge + chip driver. + Please say Y if you have such hardware. + + Say M here if you want to support this hardware as a module. + The module will be named "lontium-lt8912b". + config DRM_LONTIUM_LT9611 tristate "Lontium LT9611 DSI/HDMI bridge" select SND_SOC_HDMI_CODEC if SND_SOC diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index 86e7acc76f8d..756ce401aad3 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -2,6 +2,7 @@ obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o obj-$(CONFIG_DRM_CHRONTEL_CH7033) += chrontel-ch7033.o obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) += display-connector.o +obj-$(CONFIG_DRM_LONTIUM_LT8912B) += lontium-lt8912b.o obj-$(CONFIG_DRM_LONTIUM_LT9611) += lontium-lt9611.o obj-$(CONFIG_DRM_LONTIUM_LT9611UXC) += lontium-lt9611uxc.o obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c new file mode 100644 index 000000000000..fd0ec1c84368 --- /dev/null +++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c @@ -0,0 +1,765 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2018, The Linux Foundation. All rights reserved. + */ + +#include <linux/device.h> +#include <linux/delay.h> +#include <linux/i2c.h> +#include <linux/gpio.h> +#include <linux/of_gpio.h> +#include <linux/regmap.h> + +#include <drm/drm_probe_helper.h> +#include <drm/drm_atomic_helper.h> +#include <drm/drm_mipi_dsi.h> +#include <drm/drm_of.h> + +#include <video/videomode.h> + +#define I2C_MAIN 0 +#define I2C_ADDR_MAIN 0x48 + +#define I2C_CEC_DSI 1 +#define I2C_ADDR_CEC_DSI 0x49 + +#define I2C_MAX_IDX 2 + +struct lt8912 { + struct device *dev; + struct drm_bridge bridge; + struct drm_connector connector; + + struct i2c_client *i2c_client[I2C_MAX_IDX]; + struct regmap *regmap[I2C_MAX_IDX]; + + struct device_node *host_node; + struct drm_bridge *hdmi_port; + + struct mipi_dsi_device *dsi; + + struct gpio_desc *gp_reset; + + struct videomode mode; + + u8 data_lanes; + bool is_power_on; + bool is_attached; +}; + +static int lt8912_write_init_config(struct lt8912 *lt) +{ + const struct reg_sequence seq[] = { + /* Digital clock en*/ + {0x08, 0xff}, + {0x09, 0xff}, + {0x0a, 0xff}, + {0x0b, 0x7c}, + {0x0c, 0xff}, + {0x42, 0x04}, + + /*Tx Analog*/ + {0x31, 0xb1}, + {0x32, 0xb1}, + {0x33, 0x0e}, + {0x37, 0x00}, + {0x38, 0x22}, + {0x60, 0x82}, + + /*Cbus Analog*/ + {0x39, 0x45}, + {0x3a, 0x00}, + {0x3b, 0x00}, + + /*HDMI Pll Analog*/ + {0x44, 0x31}, + {0x55, 0x44}, + {0x57, 0x01}, + {0x5a, 0x02}, + + /*MIPI Analog*/ + {0x3e, 0xd6}, + {0x3f, 0xd4}, + {0x41, 0x3c}, + {0xB2, 0x00}, + }; + + return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq)); +} + +static int lt8912_write_mipi_basic_config(struct lt8912 *lt) +{ + const struct reg_sequence seq[] = { + {0x12, 0x04}, + {0x14, 0x00}, + {0x15, 0x00}, + {0x1a, 0x03}, + {0x1b, 0x03}, + }; + + return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); +}; + +static int lt8912_write_dds_config(struct lt8912 *lt) +{ + const struct reg_sequence seq[] = { + {0x4e, 0xff}, + {0x4f, 0x56}, + {0x50, 0x69}, + {0x51, 0x80}, + {0x1f, 0x5e}, + {0x20, 0x01}, + {0x21, 0x2c}, + {0x22, 0x01}, + {0x23, 0xfa}, + {0x24, 0x00}, + {0x25, 0xc8}, + {0x26, 0x00}, + {0x27, 0x5e}, + {0x28, 0x01}, + {0x29, 0x2c}, + {0x2a, 0x01}, + {0x2b, 0xfa}, + {0x2c, 0x00}, + {0x2d, 0xc8}, + {0x2e, 0x00}, + {0x42, 0x64}, + {0x43, 0x00}, + {0x44, 0x04}, + {0x45, 0x00}, + {0x46, 0x59}, + {0x47, 0x00}, + {0x48, 0xf2}, + {0x49, 0x06}, + {0x4a, 0x00}, + {0x4b, 0x72}, + {0x4c, 0x45}, + {0x4d, 0x00}, + {0x52, 0x08}, + {0x53, 0x00}, + {0x54, 0xb2}, + {0x55, 0x00}, + {0x56, 0xe4}, + {0x57, 0x0d}, + {0x58, 0x00}, + {0x59, 0xe4}, + {0x5a, 0x8a}, + {0x5b, 0x00}, + {0x5c, 0x34}, + {0x1e, 0x4f}, + {0x51, 0x00}, + }; + + return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); +} + +static int lt8912_write_rxlogicres_config(struct lt8912 *lt) +{ + int ret; + + ret = regmap_write(lt->regmap[I2C_MAIN], 0x03, 0x7f); + usleep_range(10000, 20000); + ret |= regmap_write(lt->regmap[I2C_MAIN], 0x03, 0xff); + + return ret; +}; + +static int lt8912_write_lvds_config(struct lt8912 *lt) +{ + const struct reg_sequence seq[] = { + {0x44, 0x30}, + {0x51, 0x05}, + {0x50, 0x24}, + {0x51, 0x2d}, + {0x52, 0x04}, + {0x69, 0x0e}, + {0x69, 0x8e}, + {0x6a, 0x00}, + {0x6c, 0xb8}, + {0x6b, 0x51}, + {0x04, 0xfb}, + {0x04, 0xff}, + {0x7f, 0x00}, + {0xa8, 0x13}, + {0x02, 0xf7}, + {0x02, 0xff}, + {0x03, 0xcf}, + {0x03, 0xff}, + }; + + return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); +}; + +static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b) +{ + return container_of(b, struct lt8912, bridge); +} + +static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c) +{ + return container_of(c, struct lt8912, connector); +} + +static const struct regmap_config lt8912_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0xff, +}; + +static int lt8912_init_i2c(struct lt8912 *lt, struct i2c_client *client) +{ + unsigned int i; + /* + * At this time we only initialize 2 chips, but the lt8912 provides + * a third interface for the audio over HDMI configuration. + */ + struct i2c_board_info info[] = { + { I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), }, + { I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), }, + }; + + if (!lt) + return -ENODEV; + + for (i = 0; i < ARRAY_SIZE(info); i++) { + if (i > 0) { + lt->i2c_client[i] = i2c_new_dummy_device(client->adapter, + info[i].addr); + if (IS_ERR(lt->i2c_client[i])) + return PTR_ERR(lt->i2c_client[i]); + } + + lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i], + <8912_regmap_config); + if (IS_ERR(lt->regmap[i])) + return PTR_ERR(lt->regmap[i]); + } + return 0; +} + +static int lt8912_free_i2c(struct lt8912 *lt) +{ + unsigned int i; + + for (i = 1; i < I2C_MAX_IDX; i++) + i2c_unregister_device(lt->i2c_client[i]); + + return 0; +} + +static int lt8912_hard_power_on(struct lt8912 *lt) +{ + gpiod_set_value_cansleep(lt->gp_reset, 0); + msleep(20); + + return 0; +} + +static void lt8912_hard_power_off(struct lt8912 *lt) +{ + gpiod_set_value_cansleep(lt->gp_reset, 1); + msleep(20); + lt->is_power_on = false; +} + +static int lt8912_video_setup(struct lt8912 *lt) +{ + u32 hactive, h_total, hpw, hfp, hbp; + u32 vactive, v_total, vpw, vfp, vbp; + u8 settle = 0x08; + int ret; + + if (!lt) + return -EINVAL; + + hactive = lt->mode.hactive; + hfp = lt->mode.hfront_porch; + hpw = lt->mode.hsync_len; + hbp = lt->mode.hback_porch; + h_total = hactive + hfp + hpw + hbp; + + vactive = lt->mode.vactive; + vfp = lt->mode.vfront_porch; + vpw = lt->mode.vsync_len; + vbp = lt->mode.vback_porch; + v_total = vactive + vfp + vpw + vbp; + + if (vactive <= 600) + settle = 0x04; + else if (vactive == 1080) + settle = 0x0a; + + ret = regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8); + + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c); + + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8); + + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8); + + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8); + + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8); + + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8); + + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff); + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8); + + return ret; +} + +static int lt8912_soft_power_on(struct lt8912 *lt) +{ + if (!lt->is_power_on) { + u32 lanes = lt->data_lanes; + + lt8912_write_init_config(lt); + regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3); + + lt8912_write_mipi_basic_config(lt); + + lt->is_power_on = true; + } + + return 0; +} + +static int lt8912_video_on(struct lt8912 *lt) +{ + int ret; + + ret = lt8912_video_setup(lt); + if (ret < 0) + goto end; + + ret = lt8912_write_dds_config(lt); + if (ret < 0) + goto end; + + ret = lt8912_write_rxlogicres_config(lt); + if (ret < 0) + goto end; + + ret = lt8912_write_lvds_config(lt); + if (ret < 0) + goto end; + +end: + return ret; +} + +static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt) +{ + int ret; + unsigned int reg_val; + + ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, ®_val); + if (ret) + return connector_status_unknown; + + if (reg_val & BIT(7)) + return connector_status_connected; + + return connector_status_disconnected; +} + +static enum drm_connector_status +lt8912_connector_detect(struct drm_connector *connector, bool force) +{ + struct lt8912 *lt = connector_to_lt8912(connector); + + if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) + return drm_bridge_detect(lt->hdmi_port); + + return lt8912_check_cable_status(lt); +} + +static const struct drm_connector_funcs lt8912_connector_funcs = { + .detect = lt8912_connector_detect, + .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, +}; + +static enum drm_mode_status +lt8912_connector_mode_valid(struct drm_connector *connector, + struct drm_display_mode *mode) +{ + if (mode->clock > 150000) + return MODE_CLOCK_HIGH; + + if (mode->hdisplay > 1920) + return MODE_BAD_HVALUE; + + if (mode->vdisplay > 1080) + return MODE_BAD_VVALUE; + + return MODE_OK; +} + +static int lt8912_connector_get_modes(struct drm_connector *connector) +{ + struct edid *edid; + int ret = -1; + int num = 0; + struct lt8912 *lt = connector_to_lt8912(connector); + u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; + + edid = drm_bridge_get_edid(lt->hdmi_port, connector); + if (edid) { + drm_connector_update_edid_property(connector, edid); + num = drm_add_edid_modes(connector, edid); + } else + return ret; + + ret = drm_display_info_set_bus_formats(&connector->display_info, + &bus_format, 1); + if (ret) + num = ret; + + kfree(edid); + return num; +} + +static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = { + .get_modes = lt8912_connector_get_modes, + .mode_valid = lt8912_connector_mode_valid, +}; + +static void lt8912_bridge_mode_set(struct drm_bridge *bridge, + const struct drm_display_mode *mode, + const struct drm_display_mode *adj) +{ + struct lt8912 *lt = bridge_to_lt8912(bridge); + + drm_display_mode_to_videomode(adj, <->mode); +} + +static void lt8912_bridge_enable(struct drm_bridge *bridge) +{ + struct lt8912 *lt = bridge_to_lt8912(bridge); + + lt8912_video_on(lt); +} + +static int lt8912_attach_dsi(struct lt8912 *lt) +{ + struct device *dev = lt->dev; + struct mipi_dsi_host *host; + struct mipi_dsi_device *dsi; + int ret = -1; + const struct mipi_dsi_device_info info = { .type = "lt8912", + .channel = 0, + .node = NULL, + }; + + host = of_find_mipi_dsi_host_by_node(lt->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)) { + ret = PTR_ERR(dsi); + dev_err(dev, "failed to create dsi device (%d)\n", ret); + goto err_dsi_device; + } + + lt->dsi = dsi; + + dsi->lanes = lt->data_lanes; + dsi->format = MIPI_DSI_FMT_RGB888; + + dsi->mode_flags = MIPI_DSI_MODE_VIDEO | + MIPI_DSI_MODE_VIDEO_BURST | + MIPI_DSI_MODE_LPM | + MIPI_DSI_MODE_EOT_PACKET; + + 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 void lt8912_detach_dsi(struct lt8912 *lt) +{ + mipi_dsi_detach(lt->dsi); + mipi_dsi_device_unregister(lt->dsi); +} + +static int lt8912_bridge_connector_init(struct drm_bridge *bridge) +{ + int ret; + struct lt8912 *lt = bridge_to_lt8912(bridge); + struct drm_connector *connector = <->connector; + + connector->polled = DRM_CONNECTOR_POLL_CONNECT | + DRM_CONNECTOR_POLL_DISCONNECT; + + ret = drm_connector_init(bridge->dev, connector, + <8912_connector_funcs, + lt->hdmi_port->type); + if (ret) + goto exit; + + drm_connector_helper_add(connector, <8912_connector_helper_funcs); + + connector->dpms = DRM_MODE_DPMS_OFF; + drm_connector_attach_encoder(connector, bridge->encoder); + +exit: + return ret; +} + +static int lt8912_bridge_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct lt8912 *lt = bridge_to_lt8912(bridge); + int ret; + + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { + ret = lt8912_bridge_connector_init(bridge); + if (ret) { + dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret); + return ret; + } + } + + ret = lt8912_hard_power_on(lt); + if (ret) + return ret; + + ret = lt8912_soft_power_on(lt); + if (ret) + goto error; + + ret = lt8912_attach_dsi(lt); + if (ret) + goto error; + + lt->is_attached = true; + + return 0; + +error: + lt8912_hard_power_off(lt); + return ret; +} + +static void lt8912_bridge_detach(struct drm_bridge *bridge) +{ + struct lt8912 *lt = bridge_to_lt8912(bridge); + + if (lt->is_attached) { + lt8912_detach_dsi(lt); + lt8912_hard_power_off(lt); + drm_connector_unregister(<->connector); + drm_connector_cleanup(<->connector); + } + +} + +static enum drm_connector_status +lt8912_bridge_detect(struct drm_bridge *bridge) +{ + struct lt8912 *lt = bridge_to_lt8912(bridge); + + if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) + return drm_bridge_detect(lt->hdmi_port); + + return lt8912_check_cable_status(lt); +} + +static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge, + struct drm_connector *connector) +{ + struct lt8912 *lt = bridge_to_lt8912(bridge); + + /* + * edid must be read through the ddc bus but it must be + * given to the hdmi connector node. + */ + if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID) + return drm_bridge_get_edid(lt->hdmi_port, connector); + + dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n"); + return NULL; +} + +static const struct drm_bridge_funcs lt8912_bridge_funcs = { + .attach = lt8912_bridge_attach, + .detach = lt8912_bridge_detach, + .mode_set = lt8912_bridge_mode_set, + .enable = lt8912_bridge_enable, + .detect = lt8912_bridge_detect, + .get_edid = lt8912_bridge_get_edid, +}; + +static int lt8912_parse_dt(struct lt8912 *lt) +{ + struct gpio_desc *gp_reset; + struct device *dev = lt->dev; + int ret = 0; + struct device_node *port_node; + struct device_node *endpoint; + + gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(gp_reset)) { + ret = PTR_ERR(gp_reset); + if (ret != -EPROBE_DEFER) + dev_err(dev, "Failed to get reset gpio: %d\n", ret); + return ret; + } + lt->gp_reset = gp_reset; + + endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1); + if (IS_ERR(endpoint)) { + ret = PTR_ERR(endpoint); + goto end; + } + + lt->data_lanes = of_property_count_u32_elems(endpoint, "data-lanes"); + of_node_put(endpoint); + + lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1); + if (!lt->host_node) { + dev_err(lt->dev, "%s: Failed to get remote port\n", __func__); + ret = -ENODEV; + goto end; + } + + port_node = of_graph_get_remote_node(dev->of_node, 1, -1); + if (!port_node) { + dev_err(lt->dev, "%s: Failed to get connector port\n", __func__); + ret = -ENODEV; + goto err_free_host_node; + } + + lt->hdmi_port = of_drm_find_bridge(port_node); + if (IS_ERR(lt->hdmi_port)) { + dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__); + ret = PTR_ERR(lt->hdmi_port); + of_node_put(lt->host_node); + goto end; + } + + if (!of_device_is_compatible(port_node, "hdmi-connector")) { + dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__); + ret = -EINVAL; + } + + of_node_put(port_node); + +end: + return ret; + +err_free_host_node: + of_node_put(lt->host_node); + return ret; +} + +static int lt8912_put_dt(struct lt8912 *lt) +{ + of_node_put(lt->host_node); + return 0; +} + +static int lt8912_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + static struct lt8912 *lt; + int ret = 0; + struct device *dev = &client->dev; + + lt = devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL); + if (!lt) + return -ENOMEM; + + lt->dev = dev; + lt->i2c_client[0] = client; + + ret = lt8912_parse_dt(lt); + if (ret) + goto err_dt_parse; + + ret = lt8912_init_i2c(lt, client); + if (ret) + goto err_i2c; + + i2c_set_clientdata(client, lt); + + lt->bridge.funcs = <8912_bridge_funcs; + lt->bridge.of_node = dev->of_node; + lt->bridge.ops = (DRM_BRIDGE_OP_EDID | + DRM_BRIDGE_OP_DETECT); + + drm_bridge_add(<->bridge); + + return 0; + +err_i2c: + lt8912_put_dt(lt); +err_dt_parse: + return ret; +} + +static int lt8912_remove(struct i2c_client *client) +{ + struct lt8912 *lt = i2c_get_clientdata(client); + + lt8912_bridge_detach(<->bridge); + drm_bridge_remove(<->bridge); + lt8912_free_i2c(lt); + lt8912_put_dt(lt); + return 0; +} + +static const struct of_device_id lt8912_dt_match[] = { + {.compatible = "lontium,lt8912b"}, + {} +}; +MODULE_DEVICE_TABLE(of, lt8912_dt_match); + +static const struct i2c_device_id lt8912_id[] = { + {"lt8912", 0}, + {}, +}; +MODULE_DEVICE_TABLE(i2c, lt8912_id); + +static struct i2c_driver lt8912_i2c_driver = { + .driver = { + .name = "lt8912", + .of_match_table = lt8912_dt_match, + .owner = THIS_MODULE, + }, + .probe = lt8912_probe, + .remove = lt8912_remove, + .id_table = lt8912_id, +}; +module_i2c_driver(lt8912_i2c_driver); + +MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>"); +MODULE_DESCRIPTION("lt8912 drm driver"); +MODULE_LICENSE("GPL v2"); -- 2.25.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel ^ permalink raw reply related [flat|nested] 6+ messages in thread
end of thread, other threads:[~2021-03-23 18:15 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-03-23 18:14 [PATCH v8 0/2] Add support of Lontium lt8912 MIPI to HDMI bridge Adrien Grassein 2021-03-23 18:14 ` Adrien Grassein 2021-03-23 18:14 ` [PATCH v8 1/2] dt-bindings: display: bridge: Add documentation for LT8912B Adrien Grassein 2021-03-23 18:14 ` Adrien Grassein 2021-03-23 18:14 ` [PATCH v8 2/2] drm/bridge: Introduce LT8912B DSI to HDMI bridge Adrien Grassein 2021-03-23 18:14 ` Adrien Grassein
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