| /* |
| * Copyright (C) 2012 Texas Instruments |
| * Author: Rob Clark <robdclark@gmail.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 as published by |
| * the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <linux/pinctrl/pinmux.h> |
| #include <linux/pinctrl/consumer.h> |
| #include <linux/backlight.h> |
| #include <linux/gpio/consumer.h> |
| #include <video/display_timing.h> |
| #include <video/of_display_timing.h> |
| #include <video/videomode.h> |
| #include <drm/drm_atomic_helper.h> |
| |
| #include "tilcdc_drv.h" |
| #include "tilcdc_panel.h" |
| |
| struct panel_module { |
| struct tilcdc_module base; |
| struct tilcdc_panel_info *info; |
| struct display_timings *timings; |
| struct backlight_device *backlight; |
| struct gpio_desc *enable_gpio; |
| }; |
| #define to_panel_module(x) container_of(x, struct panel_module, base) |
| |
| |
| /* |
| * Encoder: |
| */ |
| |
| struct panel_encoder { |
| struct drm_encoder base; |
| struct panel_module *mod; |
| }; |
| #define to_panel_encoder(x) container_of(x, struct panel_encoder, base) |
| |
| static void panel_encoder_dpms(struct drm_encoder *encoder, int mode) |
| { |
| struct panel_encoder *panel_encoder = to_panel_encoder(encoder); |
| struct backlight_device *backlight = panel_encoder->mod->backlight; |
| struct gpio_desc *gpio = panel_encoder->mod->enable_gpio; |
| |
| if (backlight) { |
| backlight->props.power = mode == DRM_MODE_DPMS_ON ? |
| FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; |
| backlight_update_status(backlight); |
| } |
| |
| if (gpio) |
| gpiod_set_value_cansleep(gpio, |
| mode == DRM_MODE_DPMS_ON ? 1 : 0); |
| } |
| |
| static void panel_encoder_prepare(struct drm_encoder *encoder) |
| { |
| panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF); |
| } |
| |
| static void panel_encoder_commit(struct drm_encoder *encoder) |
| { |
| panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON); |
| } |
| |
| static void panel_encoder_mode_set(struct drm_encoder *encoder, |
| struct drm_display_mode *mode, |
| struct drm_display_mode *adjusted_mode) |
| { |
| /* nothing needed */ |
| } |
| |
| static const struct drm_encoder_funcs panel_encoder_funcs = { |
| .destroy = drm_encoder_cleanup, |
| }; |
| |
| static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = { |
| .dpms = panel_encoder_dpms, |
| .prepare = panel_encoder_prepare, |
| .commit = panel_encoder_commit, |
| .mode_set = panel_encoder_mode_set, |
| }; |
| |
| static struct drm_encoder *panel_encoder_create(struct drm_device *dev, |
| struct panel_module *mod) |
| { |
| struct panel_encoder *panel_encoder; |
| struct drm_encoder *encoder; |
| int ret; |
| |
| panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder), |
| GFP_KERNEL); |
| if (!panel_encoder) { |
| dev_err(dev->dev, "allocation failed\n"); |
| return NULL; |
| } |
| |
| panel_encoder->mod = mod; |
| |
| encoder = &panel_encoder->base; |
| encoder->possible_crtcs = 1; |
| |
| ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs, |
| DRM_MODE_ENCODER_LVDS, NULL); |
| if (ret < 0) |
| goto fail; |
| |
| drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs); |
| |
| return encoder; |
| |
| fail: |
| drm_encoder_cleanup(encoder); |
| return NULL; |
| } |
| |
| /* |
| * Connector: |
| */ |
| |
| struct panel_connector { |
| struct drm_connector base; |
| |
| struct drm_encoder *encoder; /* our connected encoder */ |
| struct panel_module *mod; |
| }; |
| #define to_panel_connector(x) container_of(x, struct panel_connector, base) |
| |
| |
| static void panel_connector_destroy(struct drm_connector *connector) |
| { |
| drm_connector_unregister(connector); |
| drm_connector_cleanup(connector); |
| } |
| |
| static enum drm_connector_status panel_connector_detect( |
| struct drm_connector *connector, |
| bool force) |
| { |
| return connector_status_connected; |
| } |
| |
| static int panel_connector_get_modes(struct drm_connector *connector) |
| { |
| struct drm_device *dev = connector->dev; |
| struct panel_connector *panel_connector = to_panel_connector(connector); |
| struct display_timings *timings = panel_connector->mod->timings; |
| int i; |
| |
| for (i = 0; i < timings->num_timings; i++) { |
| struct drm_display_mode *mode = drm_mode_create(dev); |
| struct videomode vm; |
| |
| if (videomode_from_timings(timings, &vm, i)) |
| break; |
| |
| drm_display_mode_from_videomode(&vm, mode); |
| |
| mode->type = DRM_MODE_TYPE_DRIVER; |
| |
| if (timings->native_mode == i) |
| mode->type |= DRM_MODE_TYPE_PREFERRED; |
| |
| drm_mode_set_name(mode); |
| drm_mode_probed_add(connector, mode); |
| } |
| |
| return i; |
| } |
| |
| static int panel_connector_mode_valid(struct drm_connector *connector, |
| struct drm_display_mode *mode) |
| { |
| struct tilcdc_drm_private *priv = connector->dev->dev_private; |
| /* our only constraints are what the crtc can generate: */ |
| return tilcdc_crtc_mode_valid(priv->crtc, mode); |
| } |
| |
| static struct drm_encoder *panel_connector_best_encoder( |
| struct drm_connector *connector) |
| { |
| struct panel_connector *panel_connector = to_panel_connector(connector); |
| return panel_connector->encoder; |
| } |
| |
| static const struct drm_connector_funcs panel_connector_funcs = { |
| .destroy = panel_connector_destroy, |
| .dpms = drm_atomic_helper_connector_dpms, |
| .detect = panel_connector_detect, |
| .fill_modes = drm_helper_probe_single_connector_modes, |
| .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 panel_connector_helper_funcs = { |
| .get_modes = panel_connector_get_modes, |
| .mode_valid = panel_connector_mode_valid, |
| .best_encoder = panel_connector_best_encoder, |
| }; |
| |
| static struct drm_connector *panel_connector_create(struct drm_device *dev, |
| struct panel_module *mod, struct drm_encoder *encoder) |
| { |
| struct panel_connector *panel_connector; |
| struct drm_connector *connector; |
| int ret; |
| |
| panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector), |
| GFP_KERNEL); |
| if (!panel_connector) { |
| dev_err(dev->dev, "allocation failed\n"); |
| return NULL; |
| } |
| |
| panel_connector->encoder = encoder; |
| panel_connector->mod = mod; |
| |
| connector = &panel_connector->base; |
| |
| drm_connector_init(dev, connector, &panel_connector_funcs, |
| DRM_MODE_CONNECTOR_LVDS); |
| drm_connector_helper_add(connector, &panel_connector_helper_funcs); |
| |
| connector->interlace_allowed = 0; |
| connector->doublescan_allowed = 0; |
| |
| ret = drm_mode_connector_attach_encoder(connector, encoder); |
| if (ret) |
| goto fail; |
| |
| drm_connector_register(connector); |
| |
| return connector; |
| |
| fail: |
| panel_connector_destroy(connector); |
| return NULL; |
| } |
| |
| /* |
| * Module: |
| */ |
| |
| static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev) |
| { |
| struct panel_module *panel_mod = to_panel_module(mod); |
| struct tilcdc_drm_private *priv = dev->dev_private; |
| struct drm_encoder *encoder; |
| struct drm_connector *connector; |
| |
| encoder = panel_encoder_create(dev, panel_mod); |
| if (!encoder) |
| return -ENOMEM; |
| |
| connector = panel_connector_create(dev, panel_mod, encoder); |
| if (!connector) |
| return -ENOMEM; |
| |
| priv->encoders[priv->num_encoders++] = encoder; |
| priv->connectors[priv->num_connectors++] = connector; |
| |
| tilcdc_crtc_set_panel_info(priv->crtc, |
| to_panel_encoder(encoder)->mod->info); |
| |
| return 0; |
| } |
| |
| static const struct tilcdc_module_ops panel_module_ops = { |
| .modeset_init = panel_modeset_init, |
| }; |
| |
| /* |
| * Device: |
| */ |
| |
| /* maybe move this somewhere common if it is needed by other outputs? */ |
| static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np) |
| { |
| struct device_node *info_np; |
| struct tilcdc_panel_info *info; |
| int ret = 0; |
| |
| if (!np) { |
| pr_err("%s: no devicenode given\n", __func__); |
| return NULL; |
| } |
| |
| info_np = of_get_child_by_name(np, "panel-info"); |
| if (!info_np) { |
| pr_err("%s: could not find panel-info node\n", __func__); |
| return NULL; |
| } |
| |
| info = kzalloc(sizeof(*info), GFP_KERNEL); |
| if (!info) { |
| pr_err("%s: allocation failed\n", __func__); |
| of_node_put(info_np); |
| return NULL; |
| } |
| |
| ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias); |
| ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt); |
| ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz); |
| ret |= of_property_read_u32(info_np, "bpp", &info->bpp); |
| ret |= of_property_read_u32(info_np, "fdd", &info->fdd); |
| ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge); |
| ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl); |
| ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order); |
| ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th); |
| |
| /* optional: */ |
| info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode"); |
| info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk"); |
| |
| if (ret) { |
| pr_err("%s: error reading panel-info properties\n", __func__); |
| kfree(info); |
| of_node_put(info_np); |
| return NULL; |
| } |
| of_node_put(info_np); |
| |
| return info; |
| } |
| |
| static int panel_probe(struct platform_device *pdev) |
| { |
| struct device_node *bl_node, *node = pdev->dev.of_node; |
| struct panel_module *panel_mod; |
| struct tilcdc_module *mod; |
| struct pinctrl *pinctrl; |
| int ret; |
| |
| /* bail out early if no DT data: */ |
| if (!node) { |
| dev_err(&pdev->dev, "device-tree data is missing\n"); |
| return -ENXIO; |
| } |
| |
| panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL); |
| if (!panel_mod) |
| return -ENOMEM; |
| |
| bl_node = of_parse_phandle(node, "backlight", 0); |
| if (bl_node) { |
| panel_mod->backlight = of_find_backlight_by_node(bl_node); |
| of_node_put(bl_node); |
| |
| if (!panel_mod->backlight) |
| return -EPROBE_DEFER; |
| |
| dev_info(&pdev->dev, "found backlight\n"); |
| } |
| |
| panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable", |
| GPIOD_OUT_LOW); |
| if (IS_ERR(panel_mod->enable_gpio)) { |
| ret = PTR_ERR(panel_mod->enable_gpio); |
| dev_err(&pdev->dev, "failed to request enable GPIO\n"); |
| goto fail_backlight; |
| } |
| |
| if (panel_mod->enable_gpio) |
| dev_info(&pdev->dev, "found enable GPIO\n"); |
| |
| mod = &panel_mod->base; |
| pdev->dev.platform_data = mod; |
| |
| tilcdc_module_init(mod, "panel", &panel_module_ops); |
| |
| pinctrl = devm_pinctrl_get_select_default(&pdev->dev); |
| if (IS_ERR(pinctrl)) |
| dev_warn(&pdev->dev, "pins are not configured\n"); |
| |
| panel_mod->timings = of_get_display_timings(node); |
| if (!panel_mod->timings) { |
| dev_err(&pdev->dev, "could not get panel timings\n"); |
| ret = -EINVAL; |
| goto fail_free; |
| } |
| |
| panel_mod->info = of_get_panel_info(node); |
| if (!panel_mod->info) { |
| dev_err(&pdev->dev, "could not get panel info\n"); |
| ret = -EINVAL; |
| goto fail_timings; |
| } |
| |
| return 0; |
| |
| fail_timings: |
| display_timings_release(panel_mod->timings); |
| |
| fail_free: |
| tilcdc_module_cleanup(mod); |
| |
| fail_backlight: |
| if (panel_mod->backlight) |
| put_device(&panel_mod->backlight->dev); |
| return ret; |
| } |
| |
| static int panel_remove(struct platform_device *pdev) |
| { |
| struct tilcdc_module *mod = dev_get_platdata(&pdev->dev); |
| struct panel_module *panel_mod = to_panel_module(mod); |
| struct backlight_device *backlight = panel_mod->backlight; |
| |
| if (backlight) |
| put_device(&backlight->dev); |
| |
| display_timings_release(panel_mod->timings); |
| |
| tilcdc_module_cleanup(mod); |
| kfree(panel_mod->info); |
| |
| return 0; |
| } |
| |
| static struct of_device_id panel_of_match[] = { |
| { .compatible = "ti,tilcdc,panel", }, |
| { }, |
| }; |
| |
| struct platform_driver panel_driver = { |
| .probe = panel_probe, |
| .remove = panel_remove, |
| .driver = { |
| .owner = THIS_MODULE, |
| .name = "panel", |
| .of_match_table = panel_of_match, |
| }, |
| }; |
| |
| int __init tilcdc_panel_init(void) |
| { |
| return platform_driver_register(&panel_driver); |
| } |
| |
| void __exit tilcdc_panel_fini(void) |
| { |
| platform_driver_unregister(&panel_driver); |
| } |