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2381e02aa8
The check for mandatory DT properties width-mm and height-mm is now part of of_get_drm_panel_display_mode(), drop the redundant check from this driver. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Christoph Niedermaier <cniedermaier@dh-electronics.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Dmitry Osipenko <digetx@gmail.com> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Noralf Trønnes <noralf@tronnes.org> Cc: Rob Herring <robh+dt@kernel.org> Cc: Robert Foss <robert.foss@linaro.org> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Thomas Zimmermann <tzimmermann@suse.de> To: dri-devel@lists.freedesktop.org Reviewed-by: Noralf Trønnes <noralf@tronnes.org> Link: https://patchwork.freedesktop.org/patch/msgid/20220411004728.68203-2-marex@denx.de
250 lines
5.7 KiB
C
250 lines
5.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Generic LVDS panel driver
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*
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* Copyright (C) 2016 Laurent Pinchart
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* Copyright (C) 2016 Renesas Electronics Corporation
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*
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* Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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#include <video/display_timing.h>
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#include <video/of_display_timing.h>
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#include <video/videomode.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_of.h>
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#include <drm/drm_panel.h>
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struct panel_lvds {
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struct drm_panel panel;
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struct device *dev;
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const char *label;
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unsigned int width;
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unsigned int height;
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struct drm_display_mode dmode;
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u32 bus_flags;
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unsigned int bus_format;
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struct regulator *supply;
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struct gpio_desc *enable_gpio;
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struct gpio_desc *reset_gpio;
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enum drm_panel_orientation orientation;
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};
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static inline struct panel_lvds *to_panel_lvds(struct drm_panel *panel)
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{
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return container_of(panel, struct panel_lvds, panel);
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}
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static int panel_lvds_unprepare(struct drm_panel *panel)
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{
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struct panel_lvds *lvds = to_panel_lvds(panel);
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if (lvds->enable_gpio)
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gpiod_set_value_cansleep(lvds->enable_gpio, 0);
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if (lvds->supply)
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regulator_disable(lvds->supply);
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return 0;
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}
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static int panel_lvds_prepare(struct drm_panel *panel)
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{
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struct panel_lvds *lvds = to_panel_lvds(panel);
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if (lvds->supply) {
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int err;
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err = regulator_enable(lvds->supply);
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if (err < 0) {
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dev_err(lvds->dev, "failed to enable supply: %d\n",
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err);
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return err;
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}
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}
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if (lvds->enable_gpio)
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gpiod_set_value_cansleep(lvds->enable_gpio, 1);
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return 0;
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}
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static int panel_lvds_get_modes(struct drm_panel *panel,
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struct drm_connector *connector)
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{
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struct panel_lvds *lvds = to_panel_lvds(panel);
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struct drm_display_mode *mode;
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mode = drm_mode_duplicate(connector->dev, &lvds->dmode);
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if (!mode)
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return 0;
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mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
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drm_mode_probed_add(connector, mode);
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connector->display_info.width_mm = lvds->dmode.width_mm;
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connector->display_info.height_mm = lvds->dmode.height_mm;
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drm_display_info_set_bus_formats(&connector->display_info,
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&lvds->bus_format, 1);
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connector->display_info.bus_flags = lvds->bus_flags;
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drm_connector_set_panel_orientation(connector, lvds->orientation);
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return 1;
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}
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static const struct drm_panel_funcs panel_lvds_funcs = {
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.unprepare = panel_lvds_unprepare,
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.prepare = panel_lvds_prepare,
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.get_modes = panel_lvds_get_modes,
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};
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static int panel_lvds_parse_dt(struct panel_lvds *lvds)
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{
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struct device_node *np = lvds->dev->of_node;
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int ret;
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ret = of_drm_get_panel_orientation(np, &lvds->orientation);
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if (ret < 0) {
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dev_err(lvds->dev, "%pOF: failed to get orientation %d\n", np, ret);
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return ret;
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}
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ret = of_get_drm_panel_display_mode(np, &lvds->dmode, &lvds->bus_flags);
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if (ret < 0) {
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dev_err(lvds->dev, "%pOF: problems parsing panel-timing (%d)\n",
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np, ret);
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return ret;
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}
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of_property_read_string(np, "label", &lvds->label);
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ret = drm_of_lvds_get_data_mapping(np);
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if (ret < 0) {
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dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
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np, "data-mapping");
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return ret;
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}
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lvds->bus_format = ret;
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lvds->bus_flags |= of_property_read_bool(np, "data-mirror") ?
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DRM_BUS_FLAG_DATA_LSB_TO_MSB :
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DRM_BUS_FLAG_DATA_MSB_TO_LSB;
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return 0;
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}
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static int panel_lvds_probe(struct platform_device *pdev)
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{
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struct panel_lvds *lvds;
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int ret;
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lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
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if (!lvds)
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return -ENOMEM;
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lvds->dev = &pdev->dev;
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ret = panel_lvds_parse_dt(lvds);
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if (ret < 0)
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return ret;
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lvds->supply = devm_regulator_get_optional(lvds->dev, "power");
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if (IS_ERR(lvds->supply)) {
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ret = PTR_ERR(lvds->supply);
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if (ret != -ENODEV) {
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if (ret != -EPROBE_DEFER)
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dev_err(lvds->dev, "failed to request regulator: %d\n",
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ret);
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return ret;
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}
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lvds->supply = NULL;
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}
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/* Get GPIOs and backlight controller. */
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lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable",
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GPIOD_OUT_LOW);
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if (IS_ERR(lvds->enable_gpio)) {
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ret = PTR_ERR(lvds->enable_gpio);
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dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
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"enable", ret);
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return ret;
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}
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lvds->reset_gpio = devm_gpiod_get_optional(lvds->dev, "reset",
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GPIOD_OUT_HIGH);
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if (IS_ERR(lvds->reset_gpio)) {
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ret = PTR_ERR(lvds->reset_gpio);
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dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
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"reset", ret);
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return ret;
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}
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/*
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* TODO: Handle all power supplies specified in the DT node in a generic
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* way for panels that don't care about power supply ordering. LVDS
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* panels that require a specific power sequence will need a dedicated
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* driver.
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*/
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/* Register the panel. */
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drm_panel_init(&lvds->panel, lvds->dev, &panel_lvds_funcs,
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DRM_MODE_CONNECTOR_LVDS);
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ret = drm_panel_of_backlight(&lvds->panel);
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if (ret)
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return ret;
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drm_panel_add(&lvds->panel);
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dev_set_drvdata(lvds->dev, lvds);
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return 0;
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}
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static int panel_lvds_remove(struct platform_device *pdev)
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{
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struct panel_lvds *lvds = platform_get_drvdata(pdev);
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drm_panel_remove(&lvds->panel);
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drm_panel_disable(&lvds->panel);
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return 0;
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}
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static const struct of_device_id panel_lvds_of_table[] = {
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{ .compatible = "panel-lvds", },
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{ /* Sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, panel_lvds_of_table);
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static struct platform_driver panel_lvds_driver = {
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.probe = panel_lvds_probe,
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.remove = panel_lvds_remove,
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.driver = {
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.name = "panel-lvds",
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.of_match_table = panel_lvds_of_table,
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},
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};
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module_platform_driver(panel_lvds_driver);
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MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
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MODULE_DESCRIPTION("LVDS Panel Driver");
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MODULE_LICENSE("GPL");
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