u-boot/drivers/video/bridge/video-bridge-uclass.c
Vasily Khoruzhick 8336a43792 dm: video: bridge: don't fail to activate bridge if reset or sleep GPIO is missing
Both GPIOs are optional, so we shouldn't fail if any is missing.
Without this fix reset is not deasserted if sleep GPIO is missing.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Tested-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Cc: Vagrant Cascadian <vagrant@debian.org>
2018-11-13 22:08:23 +05:30

137 lines
3.1 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <edid.h>
#include <video_bridge.h>
int video_bridge_set_backlight(struct udevice *dev, int percent)
{
struct video_bridge_ops *ops = video_bridge_get_ops(dev);
if (!ops->set_backlight)
return -ENOSYS;
return ops->set_backlight(dev, percent);
}
int video_bridge_attach(struct udevice *dev)
{
struct video_bridge_ops *ops = video_bridge_get_ops(dev);
if (!ops->attach)
return -ENOSYS;
return ops->attach(dev);
}
int video_bridge_check_attached(struct udevice *dev)
{
struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
struct video_bridge_ops *ops = video_bridge_get_ops(dev);
int ret;
if (!ops->check_attached) {
ret = dm_gpio_get_value(&uc_priv->hotplug);
return ret > 0 ? 0 : ret == 0 ? -ENOTCONN : ret;
}
return ops->check_attached(dev);
}
int video_bridge_read_edid(struct udevice *dev, u8 *buf, int buf_size)
{
struct video_bridge_ops *ops = video_bridge_get_ops(dev);
if (!ops || !ops->read_edid)
return -ENOSYS;
return ops->read_edid(dev, buf, buf_size);
}
static int video_bridge_pre_probe(struct udevice *dev)
{
struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
int ret;
debug("%s\n", __func__);
ret = gpio_request_by_name(dev, "sleep-gpios", 0,
&uc_priv->sleep, GPIOD_IS_OUT);
if (ret) {
debug("%s: Could not decode sleep-gpios (%d)\n", __func__, ret);
if (ret != -ENOENT)
return ret;
}
/*
* Drop this for now as we do not have driver model pinctrl support
*
* ret = dm_gpio_set_pull(&uc_priv->sleep, GPIO_PULL_NONE);
* if (ret) {
* debug("%s: Could not set sleep pull value\n", __func__);
* return ret;
* }
*/
ret = gpio_request_by_name(dev, "reset-gpios", 0, &uc_priv->reset,
GPIOD_IS_OUT);
if (ret) {
debug("%s: Could not decode reset-gpios (%d)\n", __func__, ret);
if (ret != -ENOENT)
return ret;
}
/*
* Drop this for now as we do not have driver model pinctrl support
*
* ret = dm_gpio_set_pull(&uc_priv->reset, GPIO_PULL_NONE);
* if (ret) {
* debug("%s: Could not set reset pull value\n", __func__);
* return ret;
* }
*/
ret = gpio_request_by_name(dev, "hotplug-gpios", 0, &uc_priv->hotplug,
GPIOD_IS_IN);
if (ret) {
debug("%s: Could not decode hotplug (%d)\n", __func__, ret);
if (ret != -ENOENT)
return ret;
}
return 0;
}
int video_bridge_set_active(struct udevice *dev, bool active)
{
struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
int ret = 0;
debug("%s: %d\n", __func__, active);
if (uc_priv->sleep.dev) {
ret = dm_gpio_set_value(&uc_priv->sleep, !active);
if (ret)
return ret;
}
if (!active)
return 0;
if (uc_priv->reset.dev) {
ret = dm_gpio_set_value(&uc_priv->reset, true);
if (ret)
return ret;
udelay(10);
ret = dm_gpio_set_value(&uc_priv->reset, false);
}
return ret;
}
UCLASS_DRIVER(video_bridge) = {
.id = UCLASS_VIDEO_BRIDGE,
.name = "video_bridge",
.per_device_auto_alloc_size = sizeof(struct video_bridge_priv),
.pre_probe = video_bridge_pre_probe,
};