linux/drivers/gpu/drm/bridge/nxp-ptn3460.c
Thomas Gleixner 9c92ab6191 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282
Based on 1 normalized pattern(s):

  this software is licensed under the terms of the gnu general public
  license version 2 as published by the free software foundation and
  may be copied distributed and modified under those terms 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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 285 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141900.642774971@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:36:37 +02:00

368 lines
8.7 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* NXP PTN3460 DP/LVDS bridge driver
*
* Copyright (C) 2013 Google, Inc.
*/
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_probe_helper.h>
#include <drm/drmP.h>
#define PTN3460_EDID_ADDR 0x0
#define PTN3460_EDID_EMULATION_ADDR 0x84
#define PTN3460_EDID_ENABLE_EMULATION 0
#define PTN3460_EDID_EMULATION_SELECTION 1
#define PTN3460_EDID_SRAM_LOAD_ADDR 0x85
struct ptn3460_bridge {
struct drm_connector connector;
struct i2c_client *client;
struct drm_bridge bridge;
struct edid *edid;
struct drm_panel *panel;
struct gpio_desc *gpio_pd_n;
struct gpio_desc *gpio_rst_n;
u32 edid_emulation;
bool enabled;
};
static inline struct ptn3460_bridge *
bridge_to_ptn3460(struct drm_bridge *bridge)
{
return container_of(bridge, struct ptn3460_bridge, bridge);
}
static inline struct ptn3460_bridge *
connector_to_ptn3460(struct drm_connector *connector)
{
return container_of(connector, struct ptn3460_bridge, connector);
}
static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr,
u8 *buf, int len)
{
int ret;
ret = i2c_master_send(ptn_bridge->client, &addr, 1);
if (ret <= 0) {
DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
return ret;
}
ret = i2c_master_recv(ptn_bridge->client, buf, len);
if (ret <= 0) {
DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret);
return ret;
}
return 0;
}
static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr,
char val)
{
int ret;
char buf[2];
buf[0] = addr;
buf[1] = val;
ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf));
if (ret <= 0) {
DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
return ret;
}
return 0;
}
static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge)
{
int ret;
char val;
/* Load the selected edid into SRAM (accessed at PTN3460_EDID_ADDR) */
ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_SRAM_LOAD_ADDR,
ptn_bridge->edid_emulation);
if (ret) {
DRM_ERROR("Failed to transfer EDID to sram, ret=%d\n", ret);
return ret;
}
/* Enable EDID emulation and select the desired EDID */
val = 1 << PTN3460_EDID_ENABLE_EMULATION |
ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION;
ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_EMULATION_ADDR, val);
if (ret) {
DRM_ERROR("Failed to write EDID value, ret=%d\n", ret);
return ret;
}
return 0;
}
static void ptn3460_pre_enable(struct drm_bridge *bridge)
{
struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
int ret;
if (ptn_bridge->enabled)
return;
gpiod_set_value(ptn_bridge->gpio_pd_n, 1);
gpiod_set_value(ptn_bridge->gpio_rst_n, 0);
usleep_range(10, 20);
gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
if (drm_panel_prepare(ptn_bridge->panel)) {
DRM_ERROR("failed to prepare panel\n");
return;
}
/*
* There's a bug in the PTN chip where it falsely asserts hotplug before
* it is fully functional. We're forced to wait for the maximum start up
* time specified in the chip's datasheet to make sure we're really up.
*/
msleep(90);
ret = ptn3460_select_edid(ptn_bridge);
if (ret)
DRM_ERROR("Select EDID failed ret=%d\n", ret);
ptn_bridge->enabled = true;
}
static void ptn3460_enable(struct drm_bridge *bridge)
{
struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
if (drm_panel_enable(ptn_bridge->panel)) {
DRM_ERROR("failed to enable panel\n");
return;
}
}
static void ptn3460_disable(struct drm_bridge *bridge)
{
struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
if (!ptn_bridge->enabled)
return;
ptn_bridge->enabled = false;
if (drm_panel_disable(ptn_bridge->panel)) {
DRM_ERROR("failed to disable panel\n");
return;
}
gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
gpiod_set_value(ptn_bridge->gpio_pd_n, 0);
}
static void ptn3460_post_disable(struct drm_bridge *bridge)
{
struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
if (drm_panel_unprepare(ptn_bridge->panel)) {
DRM_ERROR("failed to unprepare panel\n");
return;
}
}
static int ptn3460_get_modes(struct drm_connector *connector)
{
struct ptn3460_bridge *ptn_bridge;
u8 *edid;
int ret, num_modes = 0;
bool power_off;
ptn_bridge = connector_to_ptn3460(connector);
if (ptn_bridge->edid)
return drm_add_edid_modes(connector, ptn_bridge->edid);
power_off = !ptn_bridge->enabled;
ptn3460_pre_enable(&ptn_bridge->bridge);
edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
if (!edid) {
DRM_ERROR("Failed to allocate EDID\n");
return 0;
}
ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
EDID_LENGTH);
if (ret) {
kfree(edid);
goto out;
}
ptn_bridge->edid = (struct edid *)edid;
drm_connector_update_edid_property(connector, ptn_bridge->edid);
num_modes = drm_add_edid_modes(connector, ptn_bridge->edid);
out:
if (power_off)
ptn3460_disable(&ptn_bridge->bridge);
return num_modes;
}
static const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
.get_modes = ptn3460_get_modes,
};
static const struct drm_connector_funcs ptn3460_connector_funcs = {
.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 int ptn3460_bridge_attach(struct drm_bridge *bridge)
{
struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
int ret;
if (!bridge->encoder) {
DRM_ERROR("Parent encoder object not found");
return -ENODEV;
}
ptn_bridge->connector.polled = DRM_CONNECTOR_POLL_HPD;
ret = drm_connector_init(bridge->dev, &ptn_bridge->connector,
&ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
if (ret) {
DRM_ERROR("Failed to initialize connector with drm\n");
return ret;
}
drm_connector_helper_add(&ptn_bridge->connector,
&ptn3460_connector_helper_funcs);
drm_connector_register(&ptn_bridge->connector);
drm_connector_attach_encoder(&ptn_bridge->connector,
bridge->encoder);
if (ptn_bridge->panel)
drm_panel_attach(ptn_bridge->panel, &ptn_bridge->connector);
drm_helper_hpd_irq_event(ptn_bridge->connector.dev);
return ret;
}
static const struct drm_bridge_funcs ptn3460_bridge_funcs = {
.pre_enable = ptn3460_pre_enable,
.enable = ptn3460_enable,
.disable = ptn3460_disable,
.post_disable = ptn3460_post_disable,
.attach = ptn3460_bridge_attach,
};
static int ptn3460_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct ptn3460_bridge *ptn_bridge;
int ret;
ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
if (!ptn_bridge) {
return -ENOMEM;
}
ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ptn_bridge->panel, NULL);
if (ret)
return ret;
ptn_bridge->client = client;
ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown",
GPIOD_OUT_HIGH);
if (IS_ERR(ptn_bridge->gpio_pd_n)) {
ret = PTR_ERR(ptn_bridge->gpio_pd_n);
dev_err(dev, "cannot get gpio_pd_n %d\n", ret);
return ret;
}
/*
* Request the reset pin low to avoid the bridge being
* initialized prematurely
*/
ptn_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
GPIOD_OUT_LOW);
if (IS_ERR(ptn_bridge->gpio_rst_n)) {
ret = PTR_ERR(ptn_bridge->gpio_rst_n);
DRM_ERROR("cannot get gpio_rst_n %d\n", ret);
return ret;
}
ret = of_property_read_u32(dev->of_node, "edid-emulation",
&ptn_bridge->edid_emulation);
if (ret) {
dev_err(dev, "Can't read EDID emulation value\n");
return ret;
}
ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs;
ptn_bridge->bridge.of_node = dev->of_node;
drm_bridge_add(&ptn_bridge->bridge);
i2c_set_clientdata(client, ptn_bridge);
return 0;
}
static int ptn3460_remove(struct i2c_client *client)
{
struct ptn3460_bridge *ptn_bridge = i2c_get_clientdata(client);
drm_bridge_remove(&ptn_bridge->bridge);
return 0;
}
static const struct i2c_device_id ptn3460_i2c_table[] = {
{"ptn3460", 0},
{},
};
MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table);
static const struct of_device_id ptn3460_match[] = {
{ .compatible = "nxp,ptn3460" },
{},
};
MODULE_DEVICE_TABLE(of, ptn3460_match);
static struct i2c_driver ptn3460_driver = {
.id_table = ptn3460_i2c_table,
.probe = ptn3460_probe,
.remove = ptn3460_remove,
.driver = {
.name = "nxp,ptn3460",
.of_match_table = ptn3460_match,
},
};
module_i2c_driver(ptn3460_driver);
MODULE_AUTHOR("Sean Paul <seanpaul@chromium.org>");
MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver");
MODULE_LICENSE("GPL v2");