459 lines
11 KiB
C
459 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2016 Texas Instruments
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* Author: Jyri Sarha <jsarha@ti.com>
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of_graph.h>
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#include <linux/platform_device.h>
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#include <linux/workqueue.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_print.h>
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#include <drm/drm_probe_helper.h>
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#define HOTPLUG_DEBOUNCE_MS 1100
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struct tfp410 {
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struct drm_bridge bridge;
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struct drm_connector connector;
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u32 bus_format;
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struct delayed_work hpd_work;
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struct gpio_desc *powerdown;
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struct drm_bridge_timings timings;
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struct drm_bridge *next_bridge;
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struct device *dev;
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};
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static inline struct tfp410 *
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drm_bridge_to_tfp410(struct drm_bridge *bridge)
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{
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return container_of(bridge, struct tfp410, bridge);
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}
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static inline struct tfp410 *
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drm_connector_to_tfp410(struct drm_connector *connector)
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{
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return container_of(connector, struct tfp410, connector);
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}
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static int tfp410_get_modes(struct drm_connector *connector)
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{
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struct tfp410 *dvi = drm_connector_to_tfp410(connector);
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struct edid *edid;
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int ret;
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edid = drm_bridge_get_edid(dvi->next_bridge, connector);
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if (IS_ERR_OR_NULL(edid)) {
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if (edid != ERR_PTR(-ENOTSUPP))
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DRM_INFO("EDID read failed. Fallback to standard modes\n");
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/*
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* No EDID, fallback on the XGA standard modes and prefer a mode
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* pretty much anything can handle.
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*/
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ret = drm_add_modes_noedid(connector, 1920, 1200);
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drm_set_preferred_mode(connector, 1024, 768);
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return ret;
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}
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drm_connector_update_edid_property(connector, edid);
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ret = drm_add_edid_modes(connector, edid);
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kfree(edid);
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return ret;
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}
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static const struct drm_connector_helper_funcs tfp410_con_helper_funcs = {
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.get_modes = tfp410_get_modes,
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};
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static enum drm_connector_status
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tfp410_connector_detect(struct drm_connector *connector, bool force)
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{
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struct tfp410 *dvi = drm_connector_to_tfp410(connector);
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return drm_bridge_detect(dvi->next_bridge);
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}
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static const struct drm_connector_funcs tfp410_con_funcs = {
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.detect = tfp410_connector_detect,
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.fill_modes = drm_helper_probe_single_connector_modes,
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.destroy = drm_connector_cleanup,
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.reset = drm_atomic_helper_connector_reset,
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.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
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.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
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};
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static void tfp410_hpd_work_func(struct work_struct *work)
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{
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struct tfp410 *dvi;
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dvi = container_of(work, struct tfp410, hpd_work.work);
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if (dvi->bridge.dev)
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drm_helper_hpd_irq_event(dvi->bridge.dev);
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}
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static void tfp410_hpd_callback(void *arg, enum drm_connector_status status)
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{
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struct tfp410 *dvi = arg;
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mod_delayed_work(system_wq, &dvi->hpd_work,
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msecs_to_jiffies(HOTPLUG_DEBOUNCE_MS));
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}
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static int tfp410_attach(struct drm_bridge *bridge,
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enum drm_bridge_attach_flags flags)
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{
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struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
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int ret;
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ret = drm_bridge_attach(bridge->encoder, dvi->next_bridge, bridge,
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DRM_BRIDGE_ATTACH_NO_CONNECTOR);
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if (ret < 0)
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return ret;
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if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
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return 0;
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if (!bridge->encoder) {
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dev_err(dvi->dev, "Missing encoder\n");
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return -ENODEV;
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}
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if (dvi->next_bridge->ops & DRM_BRIDGE_OP_DETECT)
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dvi->connector.polled = DRM_CONNECTOR_POLL_HPD;
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else
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dvi->connector.polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
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if (dvi->next_bridge->ops & DRM_BRIDGE_OP_HPD) {
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INIT_DELAYED_WORK(&dvi->hpd_work, tfp410_hpd_work_func);
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drm_bridge_hpd_enable(dvi->next_bridge, tfp410_hpd_callback,
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dvi);
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}
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drm_connector_helper_add(&dvi->connector,
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&tfp410_con_helper_funcs);
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ret = drm_connector_init_with_ddc(bridge->dev, &dvi->connector,
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&tfp410_con_funcs,
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dvi->next_bridge->type,
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dvi->next_bridge->ddc);
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if (ret) {
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dev_err(dvi->dev, "drm_connector_init_with_ddc() failed: %d\n",
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ret);
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return ret;
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}
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drm_display_info_set_bus_formats(&dvi->connector.display_info,
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&dvi->bus_format, 1);
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drm_connector_attach_encoder(&dvi->connector, bridge->encoder);
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return 0;
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}
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static void tfp410_detach(struct drm_bridge *bridge)
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{
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struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
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if (dvi->connector.dev && dvi->next_bridge->ops & DRM_BRIDGE_OP_HPD) {
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drm_bridge_hpd_disable(dvi->next_bridge);
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cancel_delayed_work_sync(&dvi->hpd_work);
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}
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}
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static void tfp410_enable(struct drm_bridge *bridge)
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{
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struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
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gpiod_set_value_cansleep(dvi->powerdown, 0);
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}
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static void tfp410_disable(struct drm_bridge *bridge)
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{
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struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
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gpiod_set_value_cansleep(dvi->powerdown, 1);
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}
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static enum drm_mode_status tfp410_mode_valid(struct drm_bridge *bridge,
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const struct drm_display_mode *mode)
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{
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if (mode->clock < 25000)
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return MODE_CLOCK_LOW;
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if (mode->clock > 165000)
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return MODE_CLOCK_HIGH;
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return MODE_OK;
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}
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static const struct drm_bridge_funcs tfp410_bridge_funcs = {
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.attach = tfp410_attach,
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.detach = tfp410_detach,
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.enable = tfp410_enable,
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.disable = tfp410_disable,
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.mode_valid = tfp410_mode_valid,
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};
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static const struct drm_bridge_timings tfp410_default_timings = {
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.input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE
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| DRM_BUS_FLAG_DE_HIGH,
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.setup_time_ps = 1200,
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.hold_time_ps = 1300,
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};
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static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c)
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{
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struct drm_bridge_timings *timings = &dvi->timings;
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struct device_node *ep;
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u32 pclk_sample = 0;
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u32 bus_width = 24;
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s32 deskew = 0;
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/* Start with defaults. */
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*timings = tfp410_default_timings;
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if (i2c)
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/*
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* In I2C mode timings are configured through the I2C interface.
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* As the driver doesn't support I2C configuration yet, we just
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* go with the defaults (BSEL=1, DSEL=1, DKEN=0, EDGE=1).
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*/
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return 0;
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/*
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* In non-I2C mode, timings are configured through the BSEL, DSEL, DKEN
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* and EDGE pins. They are specified in DT through endpoint properties
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* and vendor-specific properties.
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*/
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ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 0, 0);
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if (!ep)
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return -EINVAL;
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/* Get the sampling edge from the endpoint. */
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of_property_read_u32(ep, "pclk-sample", &pclk_sample);
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of_property_read_u32(ep, "bus-width", &bus_width);
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of_node_put(ep);
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timings->input_bus_flags = DRM_BUS_FLAG_DE_HIGH;
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switch (pclk_sample) {
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case 0:
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timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
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| DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE;
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break;
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case 1:
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timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE
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| DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE;
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break;
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default:
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return -EINVAL;
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}
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switch (bus_width) {
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case 12:
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dvi->bus_format = MEDIA_BUS_FMT_RGB888_2X12_LE;
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break;
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case 24:
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dvi->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
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break;
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default:
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return -EINVAL;
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}
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/* Get the setup and hold time from vendor-specific properties. */
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of_property_read_u32(dvi->dev->of_node, "ti,deskew", (u32 *)&deskew);
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if (deskew < -4 || deskew > 3)
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return -EINVAL;
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timings->setup_time_ps = min(0, 1200 - 350 * deskew);
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timings->hold_time_ps = min(0, 1300 + 350 * deskew);
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return 0;
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}
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static int tfp410_init(struct device *dev, bool i2c)
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{
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struct device_node *node;
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struct tfp410 *dvi;
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int ret;
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if (!dev->of_node) {
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dev_err(dev, "device-tree data is missing\n");
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return -ENXIO;
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}
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dvi = devm_kzalloc(dev, sizeof(*dvi), GFP_KERNEL);
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if (!dvi)
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return -ENOMEM;
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dvi->dev = dev;
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dev_set_drvdata(dev, dvi);
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dvi->bridge.funcs = &tfp410_bridge_funcs;
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dvi->bridge.of_node = dev->of_node;
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dvi->bridge.timings = &dvi->timings;
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dvi->bridge.type = DRM_MODE_CONNECTOR_DVID;
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ret = tfp410_parse_timings(dvi, i2c);
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if (ret)
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return ret;
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/* Get the next bridge, connected to port@1. */
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node = of_graph_get_remote_node(dev->of_node, 1, -1);
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if (!node)
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return -ENODEV;
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dvi->next_bridge = of_drm_find_bridge(node);
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of_node_put(node);
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if (!dvi->next_bridge)
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return -EPROBE_DEFER;
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/* Get the powerdown GPIO. */
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dvi->powerdown = devm_gpiod_get_optional(dev, "powerdown",
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GPIOD_OUT_HIGH);
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if (IS_ERR(dvi->powerdown)) {
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dev_err(dev, "failed to parse powerdown gpio\n");
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return PTR_ERR(dvi->powerdown);
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}
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/* Register the DRM bridge. */
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drm_bridge_add(&dvi->bridge);
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return 0;
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}
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static int tfp410_fini(struct device *dev)
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{
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struct tfp410 *dvi = dev_get_drvdata(dev);
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drm_bridge_remove(&dvi->bridge);
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return 0;
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}
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static int tfp410_probe(struct platform_device *pdev)
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{
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return tfp410_init(&pdev->dev, false);
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}
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static int tfp410_remove(struct platform_device *pdev)
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{
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return tfp410_fini(&pdev->dev);
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}
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static const struct of_device_id tfp410_match[] = {
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{ .compatible = "ti,tfp410" },
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{},
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};
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MODULE_DEVICE_TABLE(of, tfp410_match);
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static struct platform_driver tfp410_platform_driver = {
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.probe = tfp410_probe,
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.remove = tfp410_remove,
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.driver = {
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.name = "tfp410-bridge",
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.of_match_table = tfp410_match,
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},
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};
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#if IS_ENABLED(CONFIG_I2C)
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/* There is currently no i2c functionality. */
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static int tfp410_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int reg;
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if (!client->dev.of_node ||
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of_property_read_u32(client->dev.of_node, "reg", ®)) {
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dev_err(&client->dev,
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"Can't get i2c reg property from device-tree\n");
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return -ENXIO;
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}
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return tfp410_init(&client->dev, true);
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}
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static int tfp410_i2c_remove(struct i2c_client *client)
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{
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return tfp410_fini(&client->dev);
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}
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static const struct i2c_device_id tfp410_i2c_ids[] = {
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{ "tfp410", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tfp410_i2c_ids);
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static struct i2c_driver tfp410_i2c_driver = {
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.driver = {
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.name = "tfp410",
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.of_match_table = of_match_ptr(tfp410_match),
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},
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.id_table = tfp410_i2c_ids,
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.probe = tfp410_i2c_probe,
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.remove = tfp410_i2c_remove,
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};
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#endif /* IS_ENABLED(CONFIG_I2C) */
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static struct {
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uint i2c:1;
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uint platform:1;
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} tfp410_registered_driver;
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static int __init tfp410_module_init(void)
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{
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int ret;
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#if IS_ENABLED(CONFIG_I2C)
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ret = i2c_add_driver(&tfp410_i2c_driver);
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if (ret)
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pr_err("%s: registering i2c driver failed: %d",
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__func__, ret);
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else
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tfp410_registered_driver.i2c = 1;
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#endif
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ret = platform_driver_register(&tfp410_platform_driver);
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if (ret)
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pr_err("%s: registering platform driver failed: %d",
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__func__, ret);
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else
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tfp410_registered_driver.platform = 1;
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if (tfp410_registered_driver.i2c ||
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tfp410_registered_driver.platform)
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return 0;
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return ret;
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}
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module_init(tfp410_module_init);
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static void __exit tfp410_module_exit(void)
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{
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#if IS_ENABLED(CONFIG_I2C)
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if (tfp410_registered_driver.i2c)
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i2c_del_driver(&tfp410_i2c_driver);
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#endif
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if (tfp410_registered_driver.platform)
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platform_driver_unregister(&tfp410_platform_driver);
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}
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module_exit(tfp410_module_exit);
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MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
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MODULE_DESCRIPTION("TI TFP410 DVI bridge driver");
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MODULE_LICENSE("GPL");
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