diff options
Diffstat (limited to 'drivers/gpu/drm/bridge/lt8912.c')
| -rw-r--r-- | drivers/gpu/drm/bridge/lt8912.c | 499 |
1 files changed, 499 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/lt8912.c b/drivers/gpu/drm/bridge/lt8912.c new file mode 100644 index 000000000000..1790a71f2767 --- /dev/null +++ b/drivers/gpu/drm/bridge/lt8912.c @@ -0,0 +1,499 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2018 Rockchip Electronics Co. Ltd. + */ + +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/gpio.h> +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_graph.h> +#include <linux/regmap.h> +#include <video/of_display_timing.h> + +#include <drm/drmP.h> +#include <drm/drm_of.h> +#include <drm/drm_atomic.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_atomic_helper.h> +#include <drm/drm_panel.h> +#include <drm/drm_mipi_dsi.h> + +struct lt8912 { + struct drm_bridge bridge; + struct drm_connector connector; + struct drm_display_mode mode; + struct device *dev; + struct mipi_dsi_device *dsi; + struct regmap *regmap[3]; + struct gpio_desc *reset_n; +}; + +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); +} + +/* LT8912 MIPI to HDMI & LVDS REG setting - 20180115.txt */ +static void lt8912_init(struct lt8912 *lt8912) +{ + u8 lanes = lt8912->dsi->lanes; + const struct drm_display_mode *mode = <8912->mode; + u32 hactive, hfp, hsync, hbp, vfp, vsync, vbp, htotal, vtotal; + unsigned int version[2]; + + /* TODO: lvds output init */ + + hactive = mode->hdisplay; + hfp = mode->hsync_start - mode->hdisplay; + hsync = mode->hsync_end - mode->hsync_start; + hbp = mode->htotal - mode->hsync_end; + vfp = mode->vsync_start - mode->vdisplay; + vsync = mode->vsync_end - mode->vsync_start; + vbp = mode->vtotal - mode->vsync_end; + htotal = mode->htotal; + vtotal = mode->vtotal; + + regmap_read(lt8912->regmap[0], 0x00, &version[0]); + regmap_read(lt8912->regmap[0], 0x01, &version[1]); + + dev_info(lt8912->dev, "LT8912 ID: %02x, %02x\n", + version[0], version[1]); + + /* DigitalClockEn */ + regmap_write(lt8912->regmap[0], 0x08, 0xff); + regmap_write(lt8912->regmap[0], 0x09, 0x81); + regmap_write(lt8912->regmap[0], 0x0a, 0xff); + regmap_write(lt8912->regmap[0], 0x0b, 0x64); + regmap_write(lt8912->regmap[0], 0x0c, 0xff); + + regmap_write(lt8912->regmap[0], 0x44, 0x31); + regmap_write(lt8912->regmap[0], 0x51, 0x1f); + + /* TxAnalog */ + regmap_write(lt8912->regmap[0], 0x31, 0xa1); + regmap_write(lt8912->regmap[0], 0x32, 0xa1); + regmap_write(lt8912->regmap[0], 0x33, 0x03); + regmap_write(lt8912->regmap[0], 0x37, 0x00); + regmap_write(lt8912->regmap[0], 0x38, 0x22); + regmap_write(lt8912->regmap[0], 0x60, 0x82); + + /* CbusAnalog */ + regmap_write(lt8912->regmap[0], 0x39, 0x45); + regmap_write(lt8912->regmap[0], 0x3b, 0x00); + + /* HDMIPllAnalog */ + regmap_write(lt8912->regmap[0], 0x44, 0x31); + regmap_write(lt8912->regmap[0], 0x55, 0x44); + regmap_write(lt8912->regmap[0], 0x57, 0x01); + regmap_write(lt8912->regmap[0], 0x5a, 0x02); + + /* MipiBasicSet */ + regmap_write(lt8912->regmap[1], 0x10, 0x01); + regmap_write(lt8912->regmap[1], 0x11, 0x08); + regmap_write(lt8912->regmap[1], 0x12, 0x04); + regmap_write(lt8912->regmap[1], 0x13, lanes % 4); + regmap_write(lt8912->regmap[1], 0x14, 0x00); + + regmap_write(lt8912->regmap[1], 0x15, 0x00); + regmap_write(lt8912->regmap[1], 0x1a, 0x03); + regmap_write(lt8912->regmap[1], 0x1b, 0x03); + + /* MIPIDig */ + regmap_write(lt8912->regmap[1], 0x18, hsync); + regmap_write(lt8912->regmap[1], 0x19, vsync); + regmap_write(lt8912->regmap[1], 0x1c, hactive); + regmap_write(lt8912->regmap[1], 0x1d, hactive >> 8); + + regmap_write(lt8912->regmap[1], 0x1e, 0x67); + regmap_write(lt8912->regmap[1], 0x2f, 0x0c); + + regmap_write(lt8912->regmap[1], 0x34, htotal); + regmap_write(lt8912->regmap[1], 0x35, htotal >> 8); + regmap_write(lt8912->regmap[1], 0x36, vtotal); + regmap_write(lt8912->regmap[1], 0x37, vtotal >> 8); + regmap_write(lt8912->regmap[1], 0x38, vbp); + regmap_write(lt8912->regmap[1], 0x39, vbp >> 8); + regmap_write(lt8912->regmap[1], 0x3a, vfp); + regmap_write(lt8912->regmap[1], 0x3b, vfp >> 8); + regmap_write(lt8912->regmap[1], 0x3c, hbp); + regmap_write(lt8912->regmap[1], 0x3d, hbp >> 8); + regmap_write(lt8912->regmap[1], 0x3e, hfp); + regmap_write(lt8912->regmap[1], 0x3f, hfp >> 8); + + /* DDSConfig */ + regmap_write(lt8912->regmap[1], 0x4e, 0x52); + regmap_write(lt8912->regmap[1], 0x4f, 0xde); + regmap_write(lt8912->regmap[1], 0x50, 0xc0); + regmap_write(lt8912->regmap[1], 0x51, 0x80); + regmap_write(lt8912->regmap[1], 0x51, 0x00); + + regmap_write(lt8912->regmap[1], 0x1f, 0x5e); + regmap_write(lt8912->regmap[1], 0x20, 0x01); + regmap_write(lt8912->regmap[1], 0x21, 0x2c); + regmap_write(lt8912->regmap[1], 0x22, 0x01); + regmap_write(lt8912->regmap[1], 0x23, 0xfa); + regmap_write(lt8912->regmap[1], 0x24, 0x00); + regmap_write(lt8912->regmap[1], 0x25, 0xc8); + regmap_write(lt8912->regmap[1], 0x26, 0x00); + regmap_write(lt8912->regmap[1], 0x27, 0x5e); + regmap_write(lt8912->regmap[1], 0x28, 0x01); + regmap_write(lt8912->regmap[1], 0x29, 0x2c); + regmap_write(lt8912->regmap[1], 0x2a, 0x01); + regmap_write(lt8912->regmap[1], 0x2b, 0xfa); + regmap_write(lt8912->regmap[1], 0x2c, 0x00); + regmap_write(lt8912->regmap[1], 0x2d, 0xc8); + regmap_write(lt8912->regmap[1], 0x2e, 0x00); + + regmap_write(lt8912->regmap[0], 0x03, 0x7f); + usleep_range(10000, 20000); + regmap_write(lt8912->regmap[0], 0x03, 0xff); + + regmap_write(lt8912->regmap[1], 0x42, 0x64); + regmap_write(lt8912->regmap[1], 0x43, 0x00); + regmap_write(lt8912->regmap[1], 0x44, 0x04); + regmap_write(lt8912->regmap[1], 0x45, 0x00); + regmap_write(lt8912->regmap[1], 0x46, 0x59); + regmap_write(lt8912->regmap[1], 0x47, 0x00); + regmap_write(lt8912->regmap[1], 0x48, 0xf2); + regmap_write(lt8912->regmap[1], 0x49, 0x06); + regmap_write(lt8912->regmap[1], 0x4a, 0x00); + regmap_write(lt8912->regmap[1], 0x4b, 0x72); + regmap_write(lt8912->regmap[1], 0x4c, 0x45); + regmap_write(lt8912->regmap[1], 0x4d, 0x00); + regmap_write(lt8912->regmap[1], 0x52, 0x08); + regmap_write(lt8912->regmap[1], 0x53, 0x00); + regmap_write(lt8912->regmap[1], 0x54, 0xb2); + regmap_write(lt8912->regmap[1], 0x55, 0x00); + regmap_write(lt8912->regmap[1], 0x56, 0xe4); + regmap_write(lt8912->regmap[1], 0x57, 0x0d); + regmap_write(lt8912->regmap[1], 0x58, 0x00); + regmap_write(lt8912->regmap[1], 0x59, 0xe4); + regmap_write(lt8912->regmap[1], 0x5a, 0x8a); + regmap_write(lt8912->regmap[1], 0x5b, 0x00); + regmap_write(lt8912->regmap[1], 0x5c, 0x34); + regmap_write(lt8912->regmap[1], 0x1e, 0x4f); + regmap_write(lt8912->regmap[1], 0x51, 0x00); + + regmap_write(lt8912->regmap[0], 0xb2, 0x01); + + /* AudioIIsEn */ + regmap_write(lt8912->regmap[2], 0x06, 0x08); + regmap_write(lt8912->regmap[2], 0x07, 0xf0); + + regmap_write(lt8912->regmap[2], 0x34, 0xd2); + + regmap_write(lt8912->regmap[2], 0x3c, 0x41); + + /* MIPIRxLogicRes */ + regmap_write(lt8912->regmap[0], 0x03, 0x7f); + usleep_range(10000, 20000); + regmap_write(lt8912->regmap[0], 0x03, 0xff); + + regmap_write(lt8912->regmap[1], 0x51, 0x80); + usleep_range(10000, 20000); + regmap_write(lt8912->regmap[1], 0x51, 0x00); +} + +static void lt8912_exit(struct lt8912 *lt8912) +{ + regmap_write(lt8912->regmap[0], 0x08, 0x00); + regmap_write(lt8912->regmap[0], 0x09, 0x81); + regmap_write(lt8912->regmap[0], 0x0a, 0x00); + regmap_write(lt8912->regmap[0], 0x0b, 0x20); + regmap_write(lt8912->regmap[0], 0x0c, 0x00); + + regmap_write(lt8912->regmap[0], 0x54, 0x1d); + regmap_write(lt8912->regmap[0], 0x51, 0x15); + + regmap_write(lt8912->regmap[0], 0x44, 0x31); + regmap_write(lt8912->regmap[0], 0x41, 0xbd); + regmap_write(lt8912->regmap[0], 0x5c, 0x11); + + regmap_write(lt8912->regmap[0], 0x30, 0x08); + regmap_write(lt8912->regmap[0], 0x31, 0x00); + regmap_write(lt8912->regmap[0], 0x32, 0x00); + regmap_write(lt8912->regmap[0], 0x33, 0x00); + regmap_write(lt8912->regmap[0], 0x34, 0x00); + regmap_write(lt8912->regmap[0], 0x35, 0x00); + regmap_write(lt8912->regmap[0], 0x36, 0x00); + regmap_write(lt8912->regmap[0], 0x37, 0x00); + regmap_write(lt8912->regmap[0], 0x38, 0x00); +} + +static void lt8912_power_on(struct lt8912 *lt8912) +{ + gpiod_direction_output(lt8912->reset_n, 1); + msleep(120); + gpiod_direction_output(lt8912->reset_n, 0); +} + +static void lt8912_power_off(struct lt8912 *lt8912) +{ + gpiod_direction_output(lt8912->reset_n, 1); +} + +static enum drm_connector_status +lt8912_connector_detect(struct drm_connector *connector, bool force) +{ + /* TODO: HPD handing (reg[0xc1] - bit[7]) */ + return connector_status_connected; +} + +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 struct drm_encoder * +lt8912_connector_best_encoder(struct drm_connector *connector) +{ + struct lt8912 *lt8912 = connector_to_lt8912(connector); + + return lt8912->bridge.encoder; +} + +static int lt8912_connector_get_modes(struct drm_connector *connector) +{ + struct lt8912 *lt8912 = connector_to_lt8912(connector); + struct drm_display_mode *mode; + int ret; + + /* TODO: EDID handing */ + + mode = drm_mode_create(connector->dev); + if (!mode) + return -EINVAL; + + ret = of_get_drm_display_mode(lt8912->dev->of_node, mode, + OF_USE_NATIVE_MODE); + if (ret) { + dev_err(lt8912->dev, "failed to get display timings\n"); + drm_mode_destroy(connector->dev, mode); + return 0; + } + + mode->type |= DRM_MODE_TYPE_PREFERRED; + drm_mode_set_name(mode); + drm_mode_probed_add(connector, mode); + + return 1; +} + +static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = { + .get_modes = lt8912_connector_get_modes, + .best_encoder = lt8912_connector_best_encoder, +}; + +static void lt8912_bridge_post_disable(struct drm_bridge *bridge) +{ + struct lt8912 *lt8912 = bridge_to_lt8912(bridge); + + lt8912_power_off(lt8912); +} + +static void lt8912_bridge_disable(struct drm_bridge *bridge) +{ + struct lt8912 *lt8912 = bridge_to_lt8912(bridge); + + lt8912_exit(lt8912); +} + +static void lt8912_bridge_enable(struct drm_bridge *bridge) +{ + struct lt8912 *lt8912 = bridge_to_lt8912(bridge); + + lt8912_init(lt8912); +} + +static void lt8912_bridge_pre_enable(struct drm_bridge *bridge) +{ + struct lt8912 *lt8912 = bridge_to_lt8912(bridge); + + lt8912_power_on(lt8912); +} + +static void lt8912_bridge_mode_set(struct drm_bridge *bridge, + struct drm_display_mode *mode, + struct drm_display_mode *adj) +{ + struct lt8912 *lt8912 = bridge_to_lt8912(bridge); + + drm_mode_copy(<8912->mode, adj); +} + +static int lt8912_bridge_attach(struct drm_bridge *bridge) +{ + struct lt8912 *lt8912 = bridge_to_lt8912(bridge); + struct drm_connector *connector = <8912->connector; + int ret; + + ret = drm_connector_init(bridge->dev, connector, + <8912_connector_funcs, + DRM_MODE_CONNECTOR_HDMIA); + if (ret) { + dev_err(lt8912->dev, "failed to initialize connector\n"); + return ret; + } + + drm_connector_helper_add(connector, <8912_connector_helper_funcs); + drm_mode_connector_attach_encoder(connector, bridge->encoder); + + return 0; +} + +static const struct drm_bridge_funcs lt8912_bridge_funcs = { + .attach = lt8912_bridge_attach, + .mode_set = lt8912_bridge_mode_set, + .pre_enable = lt8912_bridge_pre_enable, + .enable = lt8912_bridge_enable, + .disable = lt8912_bridge_disable, + .post_disable = lt8912_bridge_post_disable, +}; + +static const struct regmap_config lt8912_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0xff, +}; + +static int lt8912_i2c_init(struct lt8912 *lt8912, + struct i2c_adapter *adapter) +{ + struct i2c_board_info info[] = { + { I2C_BOARD_INFO("lt8912p0", 0x48), }, + { I2C_BOARD_INFO("lt8912p1", 0x49), }, + { I2C_BOARD_INFO("lt8912p2", 0x4a), } + }; + struct regmap *regmap; + unsigned int i; + int ret; + + for (i = 0; i < ARRAY_SIZE(info); i++) { + struct i2c_client *client; + + client = i2c_new_device(adapter, &info[i]); + if (!client) + return -ENODEV; + + regmap = devm_regmap_init_i2c(client, <8912_regmap_config); + if (IS_ERR(regmap)) { + ret = PTR_ERR(regmap); + dev_err(lt8912->dev, + "Failed to initialize regmap: %d\n", ret); + return ret; + } + + lt8912->regmap[i] = regmap; + } + + return 0; +} + +static int lt8912_probe(struct mipi_dsi_device *dsi) +{ + struct device *dev = &dsi->dev; + struct lt8912 *lt8912; + struct device_node *node; + struct i2c_adapter *adapter; + int ret; + + lt8912 = devm_kzalloc(dev, sizeof(*lt8912), GFP_KERNEL); + if (!lt8912) + return -ENOMEM; + + lt8912->dev = dev; + lt8912->dsi = dsi; + mipi_dsi_set_drvdata(dsi, lt8912); + + lt8912->reset_n = devm_gpiod_get(dev, "reset", GPIOD_ASIS); + if (IS_ERR(lt8912->reset_n)) { + ret = PTR_ERR(lt8912->reset_n); + dev_err(dev, "failed to request reset GPIO: %d\n", ret); + return ret; + } + + node = of_parse_phandle(dev->of_node, "i2c-bus", 0); + if (!node) { + dev_err(dev, "No i2c-bus found\n"); + return -ENODEV; + } + + adapter = of_find_i2c_adapter_by_node(node); + of_node_put(node); + if (!adapter) { + dev_err(dev, "No i2c adapter found\n"); + return -EPROBE_DEFER; + } + + ret = lt8912_i2c_init(lt8912, adapter); + if (ret) + return ret; + + /* TODO: interrupt handing */ + + lt8912->bridge.funcs = <8912_bridge_funcs; + lt8912->bridge.of_node = dev->of_node; + ret = drm_bridge_add(<8912->bridge); + if (ret) { + dev_err(dev, "failed to add bridge: %d\n", ret); + return ret; + } + + dsi->lanes = 4; + 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) { + drm_bridge_remove(<8912->bridge); + dev_err(dev, "failed to attach dsi to host: %d\n", ret); + return ret; + } + + return 0; +} + +static int lt8912_remove(struct mipi_dsi_device *dsi) +{ + struct lt8912 *lt8912 = mipi_dsi_get_drvdata(dsi); + + mipi_dsi_detach(dsi); + drm_bridge_remove(<8912->bridge); + + return 0; +} + +static const struct of_device_id lt8912_of_match[] = { + { .compatible = "lontium,lt8912" }, + {} +}; +MODULE_DEVICE_TABLE(of, lt8912_of_match); + +static struct mipi_dsi_driver lt8912_driver = { + .driver = { + .name = "lt8912", + .of_match_table = lt8912_of_match, + }, + .probe = lt8912_probe, + .remove = lt8912_remove, +}; +module_mipi_dsi_driver(lt8912_driver); + +MODULE_AUTHOR("Wyon Bi <bivvy.bi@rock-chips.com>"); +MODULE_DESCRIPTION("Lontium LT8912 MIPI-DSI to LVDS and HDMI/MHL bridge"); +MODULE_LICENSE("GPL v2"); |