| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * i.MX drm driver - parallel display implementation |
| * |
| * Copyright (C) 2012 Sascha Hauer, Pengutronix |
| */ |
| |
| #include <linux/component.h> |
| #include <linux/module.h> |
| #include <drm/drmP.h> |
| #include <drm/drm_atomic_helper.h> |
| #include <drm/drm_fb_helper.h> |
| #include <drm/drm_crtc_helper.h> |
| #include <drm/drm_of.h> |
| #include <drm/drm_panel.h> |
| #include <linux/videodev2.h> |
| #include <video/of_display_timing.h> |
| |
| #include "imx-drm.h" |
| |
| struct imx_parallel_display { |
| struct drm_connector connector; |
| struct drm_encoder encoder; |
| struct device *dev; |
| void *edid; |
| int edid_len; |
| u32 bus_format; |
| u32 bus_flags; |
| struct drm_display_mode mode; |
| struct drm_panel *panel; |
| struct drm_bridge *bridge; |
| }; |
| |
| static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c) |
| { |
| return container_of(c, struct imx_parallel_display, connector); |
| } |
| |
| static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e) |
| { |
| return container_of(e, struct imx_parallel_display, encoder); |
| } |
| |
| static int imx_pd_connector_get_modes(struct drm_connector *connector) |
| { |
| struct imx_parallel_display *imxpd = con_to_imxpd(connector); |
| struct device_node *np = imxpd->dev->of_node; |
| int num_modes = 0; |
| |
| if (imxpd->panel && imxpd->panel->funcs && |
| imxpd->panel->funcs->get_modes) { |
| num_modes = imxpd->panel->funcs->get_modes(imxpd->panel); |
| if (num_modes > 0) |
| return num_modes; |
| } |
| |
| if (imxpd->edid) { |
| drm_connector_update_edid_property(connector, imxpd->edid); |
| num_modes = drm_add_edid_modes(connector, imxpd->edid); |
| } |
| |
| if (np) { |
| struct drm_display_mode *mode = drm_mode_create(connector->dev); |
| int ret; |
| |
| if (!mode) |
| return -EINVAL; |
| |
| ret = of_get_drm_display_mode(np, &imxpd->mode, |
| &imxpd->bus_flags, |
| OF_USE_NATIVE_MODE); |
| if (ret) |
| return ret; |
| |
| drm_mode_copy(mode, &imxpd->mode); |
| mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED, |
| drm_mode_probed_add(connector, mode); |
| num_modes++; |
| } |
| |
| return num_modes; |
| } |
| |
| static struct drm_encoder *imx_pd_connector_best_encoder( |
| struct drm_connector *connector) |
| { |
| struct imx_parallel_display *imxpd = con_to_imxpd(connector); |
| |
| return &imxpd->encoder; |
| } |
| |
| static void imx_pd_encoder_enable(struct drm_encoder *encoder) |
| { |
| struct imx_parallel_display *imxpd = enc_to_imxpd(encoder); |
| |
| drm_panel_prepare(imxpd->panel); |
| drm_panel_enable(imxpd->panel); |
| } |
| |
| static void imx_pd_encoder_disable(struct drm_encoder *encoder) |
| { |
| struct imx_parallel_display *imxpd = enc_to_imxpd(encoder); |
| |
| drm_panel_disable(imxpd->panel); |
| drm_panel_unprepare(imxpd->panel); |
| } |
| |
| static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder, |
| struct drm_crtc_state *crtc_state, |
| struct drm_connector_state *conn_state) |
| { |
| struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state); |
| struct drm_display_info *di = &conn_state->connector->display_info; |
| struct imx_parallel_display *imxpd = enc_to_imxpd(encoder); |
| |
| if (!imxpd->bus_format && di->num_bus_formats) { |
| imx_crtc_state->bus_flags = di->bus_flags; |
| imx_crtc_state->bus_format = di->bus_formats[0]; |
| } else { |
| imx_crtc_state->bus_flags = imxpd->bus_flags; |
| imx_crtc_state->bus_format = imxpd->bus_format; |
| } |
| imx_crtc_state->di_hsync_pin = 2; |
| imx_crtc_state->di_vsync_pin = 3; |
| |
| return 0; |
| } |
| |
| static const struct drm_connector_funcs imx_pd_connector_funcs = { |
| .fill_modes = drm_helper_probe_single_connector_modes, |
| .destroy = imx_drm_connector_destroy, |
| .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 const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = { |
| .get_modes = imx_pd_connector_get_modes, |
| .best_encoder = imx_pd_connector_best_encoder, |
| }; |
| |
| static const struct drm_encoder_funcs imx_pd_encoder_funcs = { |
| .destroy = imx_drm_encoder_destroy, |
| }; |
| |
| static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = { |
| .enable = imx_pd_encoder_enable, |
| .disable = imx_pd_encoder_disable, |
| .atomic_check = imx_pd_encoder_atomic_check, |
| }; |
| |
| static int imx_pd_register(struct drm_device *drm, |
| struct imx_parallel_display *imxpd) |
| { |
| struct drm_encoder *encoder = &imxpd->encoder; |
| int ret; |
| |
| ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node); |
| if (ret) |
| return ret; |
| |
| /* set the connector's dpms to OFF so that |
| * drm_helper_connector_dpms() won't return |
| * immediately since the current state is ON |
| * at this point. |
| */ |
| imxpd->connector.dpms = DRM_MODE_DPMS_OFF; |
| |
| drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs); |
| drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs, |
| DRM_MODE_ENCODER_NONE, NULL); |
| |
| if (!imxpd->bridge) { |
| drm_connector_helper_add(&imxpd->connector, |
| &imx_pd_connector_helper_funcs); |
| drm_connector_init(drm, &imxpd->connector, |
| &imx_pd_connector_funcs, |
| DRM_MODE_CONNECTOR_DPI); |
| } |
| |
| if (imxpd->panel) |
| drm_panel_attach(imxpd->panel, &imxpd->connector); |
| |
| if (imxpd->bridge) { |
| ret = drm_bridge_attach(encoder, imxpd->bridge, NULL); |
| if (ret < 0) { |
| dev_err(imxpd->dev, "failed to attach bridge: %d\n", |
| ret); |
| return ret; |
| } |
| } else { |
| drm_connector_attach_encoder(&imxpd->connector, encoder); |
| } |
| |
| return 0; |
| } |
| |
| static int imx_pd_bind(struct device *dev, struct device *master, void *data) |
| { |
| struct drm_device *drm = data; |
| struct device_node *np = dev->of_node; |
| const u8 *edidp; |
| struct imx_parallel_display *imxpd; |
| int ret; |
| u32 bus_format = 0; |
| const char *fmt; |
| |
| imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL); |
| if (!imxpd) |
| return -ENOMEM; |
| |
| edidp = of_get_property(np, "edid", &imxpd->edid_len); |
| if (edidp) |
| imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL); |
| |
| ret = of_property_read_string(np, "interface-pix-fmt", &fmt); |
| if (!ret) { |
| if (!strcmp(fmt, "rgb24")) |
| bus_format = MEDIA_BUS_FMT_RGB888_1X24; |
| else if (!strcmp(fmt, "rgb565")) |
| bus_format = MEDIA_BUS_FMT_RGB565_1X16; |
| else if (!strcmp(fmt, "bgr666")) |
| bus_format = MEDIA_BUS_FMT_RGB666_1X18; |
| else if (!strcmp(fmt, "lvds666")) |
| bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI; |
| } |
| imxpd->bus_format = bus_format; |
| |
| /* port@1 is the output port */ |
| ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge); |
| if (ret && ret != -ENODEV) |
| return ret; |
| |
| imxpd->dev = dev; |
| |
| ret = imx_pd_register(drm, imxpd); |
| if (ret) |
| return ret; |
| |
| dev_set_drvdata(dev, imxpd); |
| |
| return 0; |
| } |
| |
| static void imx_pd_unbind(struct device *dev, struct device *master, |
| void *data) |
| { |
| struct imx_parallel_display *imxpd = dev_get_drvdata(dev); |
| |
| if (imxpd->panel) |
| drm_panel_detach(imxpd->panel); |
| |
| kfree(imxpd->edid); |
| } |
| |
| static const struct component_ops imx_pd_ops = { |
| .bind = imx_pd_bind, |
| .unbind = imx_pd_unbind, |
| }; |
| |
| static int imx_pd_probe(struct platform_device *pdev) |
| { |
| return component_add(&pdev->dev, &imx_pd_ops); |
| } |
| |
| static int imx_pd_remove(struct platform_device *pdev) |
| { |
| component_del(&pdev->dev, &imx_pd_ops); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id imx_pd_dt_ids[] = { |
| { .compatible = "fsl,imx-parallel-display", }, |
| { /* sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(of, imx_pd_dt_ids); |
| |
| static struct platform_driver imx_pd_driver = { |
| .probe = imx_pd_probe, |
| .remove = imx_pd_remove, |
| .driver = { |
| .of_match_table = imx_pd_dt_ids, |
| .name = "imx-parallel-display", |
| }, |
| }; |
| |
| module_platform_driver(imx_pd_driver); |
| |
| MODULE_DESCRIPTION("i.MX parallel display driver"); |
| MODULE_AUTHOR("Sascha Hauer, Pengutronix"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:imx-parallel-display"); |