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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2016 Texas Instruments
* Author: Jyri Sarha <jsarha@ti.com>
*/
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
#define HOTPLUG_DEBOUNCE_MS 1100
struct tfp410 {
struct drm_bridge bridge;
struct drm_connector connector;
u32 bus_format;
struct delayed_work hpd_work;
struct gpio_desc *powerdown;
struct drm_bridge_timings timings;
struct drm_bridge *next_bridge;
struct device *dev;
};
static inline struct tfp410 *
drm_bridge_to_tfp410(struct drm_bridge *bridge)
{
return container_of(bridge, struct tfp410, bridge);
}
static inline struct tfp410 *
drm_connector_to_tfp410(struct drm_connector *connector)
{
return container_of(connector, struct tfp410, connector);
}
static int tfp410_get_modes(struct drm_connector *connector)
{
struct tfp410 *dvi = drm_connector_to_tfp410(connector);
struct edid *edid;
int ret;
edid = drm_bridge_get_edid(dvi->next_bridge, connector);
if (IS_ERR_OR_NULL(edid)) {
if (edid != ERR_PTR(-ENOTSUPP))
DRM_INFO("EDID read failed. Fallback to standard modes\n");
/*
* No EDID, fallback on the XGA standard modes and prefer a mode
* pretty much anything can handle.
*/
ret = drm_add_modes_noedid(connector, 1920, 1200);
drm_set_preferred_mode(connector, 1024, 768);
return ret;
}
drm_connector_update_edid_property(connector, edid);
ret = drm_add_edid_modes(connector, edid);
kfree(edid);
return ret;
}
static const struct drm_connector_helper_funcs tfp410_con_helper_funcs = {
.get_modes = tfp410_get_modes,
};
static enum drm_connector_status
tfp410_connector_detect(struct drm_connector *connector, bool force)
{
struct tfp410 *dvi = drm_connector_to_tfp410(connector);
return drm_bridge_detect(dvi->next_bridge);
}
static const struct drm_connector_funcs tfp410_con_funcs = {
.detect = tfp410_connector_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.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 void tfp410_hpd_work_func(struct work_struct *work)
{
struct tfp410 *dvi;
dvi = container_of(work, struct tfp410, hpd_work.work);
if (dvi->bridge.dev)
drm_helper_hpd_irq_event(dvi->bridge.dev);
}
static void tfp410_hpd_callback(void *arg, enum drm_connector_status status)
{
struct tfp410 *dvi = arg;
mod_delayed_work(system_wq, &dvi->hpd_work,
msecs_to_jiffies(HOTPLUG_DEBOUNCE_MS));
}
static int tfp410_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
int ret;
ret = drm_bridge_attach(bridge->encoder, dvi->next_bridge, bridge,
DRM_BRIDGE_ATTACH_NO_CONNECTOR);
if (ret < 0)
return ret;
if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
return 0;
if (!bridge->encoder) {
dev_err(dvi->dev, "Missing encoder\n");
return -ENODEV;
}
if (dvi->next_bridge->ops & DRM_BRIDGE_OP_DETECT)
dvi->connector.polled = DRM_CONNECTOR_POLL_HPD;
else
dvi->connector.polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
if (dvi->next_bridge->ops & DRM_BRIDGE_OP_HPD) {
INIT_DELAYED_WORK(&dvi->hpd_work, tfp410_hpd_work_func);
drm_bridge_hpd_enable(dvi->next_bridge, tfp410_hpd_callback,
dvi);
}
drm_connector_helper_add(&dvi->connector,
&tfp410_con_helper_funcs);
ret = drm_connector_init_with_ddc(bridge->dev, &dvi->connector,
&tfp410_con_funcs,
dvi->next_bridge->type,
dvi->next_bridge->ddc);
if (ret) {
dev_err(dvi->dev, "drm_connector_init_with_ddc() failed: %d\n",
ret);
return ret;
}
drm_display_info_set_bus_formats(&dvi->connector.display_info,
&dvi->bus_format, 1);
drm_connector_attach_encoder(&dvi->connector, bridge->encoder);
return 0;
}
static void tfp410_detach(struct drm_bridge *bridge)
{
struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
if (dvi->connector.dev && dvi->next_bridge->ops & DRM_BRIDGE_OP_HPD) {
drm_bridge_hpd_disable(dvi->next_bridge);
cancel_delayed_work_sync(&dvi->hpd_work);
}
}
static void tfp410_enable(struct drm_bridge *bridge)
{
struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
gpiod_set_value_cansleep(dvi->powerdown, 0);
}
static void tfp410_disable(struct drm_bridge *bridge)
{
struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
gpiod_set_value_cansleep(dvi->powerdown, 1);
}
static enum drm_mode_status tfp410_mode_valid(struct drm_bridge *bridge,
const struct drm_display_mode *mode)
{
if (mode->clock < 25000)
return MODE_CLOCK_LOW;
if (mode->clock > 165000)
return MODE_CLOCK_HIGH;
return MODE_OK;
}
static const struct drm_bridge_funcs tfp410_bridge_funcs = {
.attach = tfp410_attach,
.detach = tfp410_detach,
.enable = tfp410_enable,
.disable = tfp410_disable,
.mode_valid = tfp410_mode_valid,
};
static const struct drm_bridge_timings tfp410_default_timings = {
.input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE
| DRM_BUS_FLAG_DE_HIGH,
.setup_time_ps = 1200,
.hold_time_ps = 1300,
};
static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c)
{
struct drm_bridge_timings *timings = &dvi->timings;
struct device_node *ep;
u32 pclk_sample = 0;
u32 bus_width = 24;
s32 deskew = 0;
/* Start with defaults. */
*timings = tfp410_default_timings;
if (i2c)
/*
* In I2C mode timings are configured through the I2C interface.
* As the driver doesn't support I2C configuration yet, we just
* go with the defaults (BSEL=1, DSEL=1, DKEN=0, EDGE=1).
*/
return 0;
/*
* In non-I2C mode, timings are configured through the BSEL, DSEL, DKEN
* and EDGE pins. They are specified in DT through endpoint properties
* and vendor-specific properties.
*/
ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 0, 0);
if (!ep)
return -EINVAL;
/* Get the sampling edge from the endpoint. */
of_property_read_u32(ep, "pclk-sample", &pclk_sample);
of_property_read_u32(ep, "bus-width", &bus_width);
of_node_put(ep);
timings->input_bus_flags = DRM_BUS_FLAG_DE_HIGH;
switch (pclk_sample) {
case 0:
timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
| DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE;
break;
case 1:
timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE
| DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE;
break;
default:
return -EINVAL;
}
switch (bus_width) {
case 12:
dvi->bus_format = MEDIA_BUS_FMT_RGB888_2X12_LE;
break;
ca
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