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author | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2016-11-18 01:58:18 +0100 |
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committer | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2017-04-04 16:03:35 +0200 |
commit | 7c9dff5bd643052989ec0982a8fc30b26b940db9 (patch) | |
tree | 1c7a4e76a3047049e0e0e2b15ddf883cdb44c281 /drivers/gpu/drm/panel/panel-lvds.c | |
parent | drm: Add data transmission order bus flag (diff) | |
download | linux-7c9dff5bd643052989ec0982a8fc30b26b940db9.tar.xz linux-7c9dff5bd643052989ec0982a8fc30b26b940db9.zip |
drm: panels: Add LVDS panel driver
This driver supports LVDS panels that don't require device-specific
handling of power supplies or control signals. It implements automatic
backlight handling if the panel is attached to a backlight controller.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Diffstat (limited to 'drivers/gpu/drm/panel/panel-lvds.c')
-rw-r--r-- | drivers/gpu/drm/panel/panel-lvds.c | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panel/panel-lvds.c b/drivers/gpu/drm/panel/panel-lvds.c new file mode 100644 index 000000000000..3216aa9a88d6 --- /dev/null +++ b/drivers/gpu/drm/panel/panel-lvds.c @@ -0,0 +1,286 @@ +/* + * rcar_du_crtc.c -- R-Car Display Unit CRTCs + * + * Copyright (C) 2016 Laurent Pinchart + * Copyright (C) 2016 Renesas Electronics Corporation + * + * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/backlight.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include <drm/drmP.h> +#include <drm/drm_crtc.h> +#include <drm/drm_panel.h> + +#include <video/display_timing.h> +#include <video/of_display_timing.h> +#include <video/videomode.h> + +struct panel_lvds { + struct drm_panel panel; + struct device *dev; + + const char *label; + unsigned int width; + unsigned int height; + struct videomode video_mode; + unsigned int bus_format; + bool data_mirror; + + struct backlight_device *backlight; + + struct gpio_desc *enable_gpio; + struct gpio_desc *reset_gpio; +}; + +static inline struct panel_lvds *to_panel_lvds(struct drm_panel *panel) +{ + return container_of(panel, struct panel_lvds, panel); +} + +static int panel_lvds_disable(struct drm_panel *panel) +{ + struct panel_lvds *lvds = to_panel_lvds(panel); + + if (lvds->backlight) { + lvds->backlight->props.power = FB_BLANK_POWERDOWN; + lvds->backlight->props.state |= BL_CORE_FBBLANK; + backlight_update_status(lvds->backlight); + } + + return 0; +} + +static int panel_lvds_unprepare(struct drm_panel *panel) +{ + struct panel_lvds *lvds = to_panel_lvds(panel); + + if (lvds->enable_gpio) + gpiod_set_value_cansleep(lvds->enable_gpio, 0); + + return 0; +} + +static int panel_lvds_prepare(struct drm_panel *panel) +{ + struct panel_lvds *lvds = to_panel_lvds(panel); + + if (lvds->enable_gpio) + gpiod_set_value_cansleep(lvds->enable_gpio, 1); + + return 0; +} + +static int panel_lvds_enable(struct drm_panel *panel) +{ + struct panel_lvds *lvds = to_panel_lvds(panel); + + if (lvds->backlight) { + lvds->backlight->props.state &= ~BL_CORE_FBBLANK; + lvds->backlight->props.power = FB_BLANK_UNBLANK; + backlight_update_status(lvds->backlight); + } + + return 0; +} + +static int panel_lvds_get_modes(struct drm_panel *panel) +{ + struct panel_lvds *lvds = to_panel_lvds(panel); + struct drm_connector *connector = lvds->panel.connector; + struct drm_display_mode *mode; + + mode = drm_mode_create(lvds->panel.drm); + if (!mode) + return 0; + + drm_display_mode_from_videomode(&lvds->video_mode, mode); + mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; + drm_mode_probed_add(connector, mode); + + connector->display_info.width_mm = lvds->width; + connector->display_info.height_mm = lvds->height; + drm_display_info_set_bus_formats(&connector->display_info, + &lvds->bus_format, 1); + connector->display_info.bus_flags = lvds->data_mirror + ? DRM_BUS_FLAG_DATA_LSB_TO_MSB + : DRM_BUS_FLAG_DATA_MSB_TO_LSB; + + return 1; +} + +static const struct drm_panel_funcs panel_lvds_funcs = { + .disable = panel_lvds_disable, + .unprepare = panel_lvds_unprepare, + .prepare = panel_lvds_prepare, + .enable = panel_lvds_enable, + .get_modes = panel_lvds_get_modes, +}; + +static int panel_lvds_parse_dt(struct panel_lvds *lvds) +{ + struct device_node *np = lvds->dev->of_node; + struct display_timing timing; + const char *mapping; + int ret; + + ret = of_get_display_timing(np, "panel-timing", &timing); + if (ret < 0) + return ret; + + videomode_from_timing(&timing, &lvds->video_mode); + + ret = of_property_read_u32(np, "width-mm", &lvds->width); + if (ret < 0) { + dev_err(lvds->dev, "%s: invalid or missing %s DT property\n", + of_node_full_name(np), "width-mm"); + return -ENODEV; + } + ret = of_property_read_u32(np, "height-mm", &lvds->height); + if (ret < 0) { + dev_err(lvds->dev, "%s: invalid or missing %s DT property\n", + of_node_full_name(np), "height-mm"); + return -ENODEV; + } + + of_property_read_string(np, "label", &lvds->label); + + ret = of_property_read_string(np, "data-mapping", &mapping); + if (ret < 0) { + dev_err(lvds->dev, "%s: invalid or missing %s DT property\n", + of_node_full_name(np), "data-mapping"); + return -ENODEV; + } + + if (!strcmp(mapping, "jeida-18")) { + lvds->bus_format = MEDIA_BUS_FMT_RGB666_1X7X3_SPWG; + } else if (!strcmp(mapping, "jeida-24")) { + lvds->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA; + } else if (!strcmp(mapping, "vesa-24")) { + lvds->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG; + } else { + dev_err(lvds->dev, "%s: invalid or missing %s DT property\n", + of_node_full_name(np), "data-mapping"); + return -EINVAL; + } + + lvds->data_mirror = of_property_read_bool(np, "data-mirror"); + + return 0; +} + +static int panel_lvds_probe(struct platform_device *pdev) +{ + struct panel_lvds *lvds; + struct device_node *np; + int ret; + + lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL); + if (!lvds) + return -ENOMEM; + + lvds->dev = &pdev->dev; + + ret = panel_lvds_parse_dt(lvds); + if (ret < 0) + return ret; + + /* Get GPIOs and backlight controller. */ + lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable", + GPIOD_OUT_LOW); + if (IS_ERR(lvds->enable_gpio)) { + ret = PTR_ERR(lvds->enable_gpio); + dev_err(lvds->dev, "failed to request %s GPIO: %d\n", + "enable", ret); + return ret; + } + + lvds->reset_gpio = devm_gpiod_get_optional(lvds->dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(lvds->reset_gpio)) { + ret = PTR_ERR(lvds->reset_gpio); + dev_err(lvds->dev, "failed to request %s GPIO: %d\n", + "reset", ret); + return ret; + } + + np = of_parse_phandle(lvds->dev->of_node, "backlight", 0); + if (np) { + lvds->backlight = of_find_backlight_by_node(np); + of_node_put(np); + + if (!lvds->backlight) + return -EPROBE_DEFER; + } + + /* + * TODO: Handle all power supplies specified in the DT node in a generic + * way for panels that don't care about power supply ordering. LVDS + * panels that require a specific power sequence will need a dedicated + * driver. + */ + + /* Register the panel. */ + drm_panel_init(&lvds->panel); + lvds->panel.dev = lvds->dev; + lvds->panel.funcs = &panel_lvds_funcs; + + ret = drm_panel_add(&lvds->panel); + if (ret < 0) + goto error; + + dev_set_drvdata(lvds->dev, lvds); + return 0; + +error: + put_device(&lvds->backlight->dev); + return ret; +} + +static int panel_lvds_remove(struct platform_device *pdev) +{ + struct panel_lvds *lvds = dev_get_drvdata(&pdev->dev); + + drm_panel_detach(&lvds->panel); + drm_panel_remove(&lvds->panel); + + panel_lvds_disable(&lvds->panel); + + if (lvds->backlight) + put_device(&lvds->backlight->dev); + + return 0; +} + +static const struct of_device_id panel_lvds_of_table[] = { + { .compatible = "panel-lvds", }, + { /* Sentinel */ }, +}; + +MODULE_DEVICE_TABLE(of, panel_lvds_of_table); + +static struct platform_driver panel_lvds_driver = { + .probe = panel_lvds_probe, + .remove = panel_lvds_remove, + .driver = { + .name = "panel-lvds", + .of_match_table = panel_lvds_of_table, + }, +}; + +module_platform_driver(panel_lvds_driver); + +MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); +MODULE_DESCRIPTION("LVDS Panel Driver"); +MODULE_LICENSE("GPL"); |