From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/gpu/drm/bridge/thc63lvd1024.c | 258 ++++++++++++++++++++++++++++++++++ 1 file changed, 258 insertions(+) create mode 100644 drivers/gpu/drm/bridge/thc63lvd1024.c (limited to 'drivers/gpu/drm/bridge/thc63lvd1024.c') diff --git a/drivers/gpu/drm/bridge/thc63lvd1024.c b/drivers/gpu/drm/bridge/thc63lvd1024.c new file mode 100644 index 0000000000..d4c1a601bb --- /dev/null +++ b/drivers/gpu/drm/bridge/thc63lvd1024.c @@ -0,0 +1,258 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * THC63LVD1024 LVDS to parallel data DRM bridge driver. + * + * Copyright (C) 2018 Jacopo Mondi + */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +enum thc63_ports { + THC63_LVDS_IN0, + THC63_LVDS_IN1, + THC63_RGB_OUT0, + THC63_RGB_OUT1, +}; + +struct thc63_dev { + struct device *dev; + + struct regulator *vcc; + + struct gpio_desc *pdwn; + struct gpio_desc *oe; + + struct drm_bridge bridge; + struct drm_bridge *next; + + struct drm_bridge_timings timings; +}; + +static inline struct thc63_dev *to_thc63(struct drm_bridge *bridge) +{ + return container_of(bridge, struct thc63_dev, bridge); +} + +static int thc63_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct thc63_dev *thc63 = to_thc63(bridge); + + return drm_bridge_attach(bridge->encoder, thc63->next, bridge, flags); +} + +static enum drm_mode_status thc63_mode_valid(struct drm_bridge *bridge, + const struct drm_display_info *info, + const struct drm_display_mode *mode) +{ + struct thc63_dev *thc63 = to_thc63(bridge); + unsigned int min_freq; + unsigned int max_freq; + + /* + * The THC63LVD1024 pixel rate range is 8 to 135 MHz in all modes but + * dual-in, single-out where it is 40 to 150 MHz. As dual-in, dual-out + * isn't supported by the driver yet, simply derive the limits from the + * input mode. + */ + if (thc63->timings.dual_link) { + min_freq = 40000; + max_freq = 150000; + } else { + min_freq = 8000; + max_freq = 135000; + } + + if (mode->clock < min_freq) + return MODE_CLOCK_LOW; + + if (mode->clock > max_freq) + return MODE_CLOCK_HIGH; + + return MODE_OK; +} + +static void thc63_enable(struct drm_bridge *bridge) +{ + struct thc63_dev *thc63 = to_thc63(bridge); + int ret; + + ret = regulator_enable(thc63->vcc); + if (ret) { + dev_err(thc63->dev, + "Failed to enable regulator \"vcc\": %d\n", ret); + return; + } + + gpiod_set_value(thc63->pdwn, 0); + gpiod_set_value(thc63->oe, 1); +} + +static void thc63_disable(struct drm_bridge *bridge) +{ + struct thc63_dev *thc63 = to_thc63(bridge); + int ret; + + gpiod_set_value(thc63->oe, 0); + gpiod_set_value(thc63->pdwn, 1); + + ret = regulator_disable(thc63->vcc); + if (ret) + dev_err(thc63->dev, + "Failed to disable regulator \"vcc\": %d\n", ret); +} + +static const struct drm_bridge_funcs thc63_bridge_func = { + .attach = thc63_attach, + .mode_valid = thc63_mode_valid, + .enable = thc63_enable, + .disable = thc63_disable, +}; + +static int thc63_parse_dt(struct thc63_dev *thc63) +{ + struct device_node *endpoint; + struct device_node *remote; + + endpoint = of_graph_get_endpoint_by_regs(thc63->dev->of_node, + THC63_RGB_OUT0, -1); + if (!endpoint) { + dev_err(thc63->dev, "Missing endpoint in port@%u\n", + THC63_RGB_OUT0); + return -ENODEV; + } + + remote = of_graph_get_remote_port_parent(endpoint); + of_node_put(endpoint); + if (!remote) { + dev_err(thc63->dev, "Endpoint in port@%u unconnected\n", + THC63_RGB_OUT0); + return -ENODEV; + } + + if (!of_device_is_available(remote)) { + dev_err(thc63->dev, "port@%u remote endpoint is disabled\n", + THC63_RGB_OUT0); + of_node_put(remote); + return -ENODEV; + } + + thc63->next = of_drm_find_bridge(remote); + of_node_put(remote); + if (!thc63->next) + return -EPROBE_DEFER; + + endpoint = of_graph_get_endpoint_by_regs(thc63->dev->of_node, + THC63_LVDS_IN1, -1); + if (endpoint) { + remote = of_graph_get_remote_port_parent(endpoint); + of_node_put(endpoint); + + if (remote) { + if (of_device_is_available(remote)) + thc63->timings.dual_link = true; + of_node_put(remote); + } + } + + dev_dbg(thc63->dev, "operating in %s-link mode\n", + thc63->timings.dual_link ? "dual" : "single"); + + return 0; +} + +static int thc63_gpio_init(struct thc63_dev *thc63) +{ + thc63->oe = devm_gpiod_get_optional(thc63->dev, "oe", GPIOD_OUT_LOW); + if (IS_ERR(thc63->oe)) { + dev_err(thc63->dev, "Unable to get \"oe-gpios\": %ld\n", + PTR_ERR(thc63->oe)); + return PTR_ERR(thc63->oe); + } + + thc63->pdwn = devm_gpiod_get_optional(thc63->dev, "powerdown", + GPIOD_OUT_HIGH); + if (IS_ERR(thc63->pdwn)) { + dev_err(thc63->dev, "Unable to get \"powerdown-gpios\": %ld\n", + PTR_ERR(thc63->pdwn)); + return PTR_ERR(thc63->pdwn); + } + + return 0; +} + +static int thc63_probe(struct platform_device *pdev) +{ + struct thc63_dev *thc63; + int ret; + + thc63 = devm_kzalloc(&pdev->dev, sizeof(*thc63), GFP_KERNEL); + if (!thc63) + return -ENOMEM; + + thc63->dev = &pdev->dev; + platform_set_drvdata(pdev, thc63); + + thc63->vcc = devm_regulator_get(thc63->dev, "vcc"); + if (IS_ERR(thc63->vcc)) { + if (PTR_ERR(thc63->vcc) == -EPROBE_DEFER) + return -EPROBE_DEFER; + + dev_err(thc63->dev, "Unable to get \"vcc\" supply: %ld\n", + PTR_ERR(thc63->vcc)); + return PTR_ERR(thc63->vcc); + } + + ret = thc63_gpio_init(thc63); + if (ret) + return ret; + + ret = thc63_parse_dt(thc63); + if (ret) + return ret; + + thc63->bridge.driver_private = thc63; + thc63->bridge.of_node = pdev->dev.of_node; + thc63->bridge.funcs = &thc63_bridge_func; + thc63->bridge.timings = &thc63->timings; + + drm_bridge_add(&thc63->bridge); + + return 0; +} + +static void thc63_remove(struct platform_device *pdev) +{ + struct thc63_dev *thc63 = platform_get_drvdata(pdev); + + drm_bridge_remove(&thc63->bridge); +} + +static const struct of_device_id thc63_match[] = { + { .compatible = "thine,thc63lvd1024", }, + { }, +}; +MODULE_DEVICE_TABLE(of, thc63_match); + +static struct platform_driver thc63_driver = { + .probe = thc63_probe, + .remove_new = thc63_remove, + .driver = { + .name = "thc63lvd1024", + .of_match_table = thc63_match, + }, +}; +module_platform_driver(thc63_driver); + +MODULE_AUTHOR("Jacopo Mondi "); +MODULE_DESCRIPTION("Thine THC63LVD1024 LVDS decoder DRM bridge driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3